libdap Updated for version 3.20.11
libdap4 is an implementation of OPeNDAP's DAP protocol.
libdap::D4Sequence Class Reference

Holds a sequence. More...

#include <D4Sequence.h>

Inheritance diagram for libdap::D4Sequence:
Inheritance graph

Public Types

typedef stack< BaseType * > btp_stack
 
typedef std::vector< BaseType * >::const_iterator Vars_citer
 
typedef std::vector< BaseType * >::iterator Vars_iter
 
typedef std::vector< BaseType * >::reverse_iterator Vars_riter
 

Public Member Functions

void add_var (BaseType *bt, Part part=nil) override
 
void add_var_nocopy (BaseType *bt, Part part=nil) override
 
unsigned int buf2val (void **) override
 Reads the class data. More...
 
bool check_semantics (string &msg, bool all=false) override
 Compare an object's current state with the semantics of its type. More...
 
D4FilterClauseListclauses ()
 Access the filter clauses for this D4Sequence. More...
 
virtual void clear_local_data ()
 
void compute_checksum (Crc32 &checksum) override
 include the data for this variable in the checksum DAP4 includes a checksum with every data response. This method adds the variable's data to that checksum. More...
 
virtual bool d4_ops (BaseType *b, int op)
 Evaluator a relop for DAP4. More...
 
 D4Sequence (const D4Sequence &rhs)
 The Sequence copy constructor. More...
 
 D4Sequence (const string &n)
 The Sequence constructor. More...
 
 D4Sequence (const string &n, const string &d)
 The Sequence server-side constructor. More...
 
virtual string dataset () const
 Returns the name of the dataset used to create this instance. More...
 
virtual void del_var (const string &name)
 Remove an element from a Constructor. More...
 
virtual void del_var (Vars_iter i)
 Delete the BaseType* and erase the iterator . More...
 
virtual void deserialize (D4StreamUnMarshaller &um, DMR &dmr)
 
virtual bool deserialize (UnMarshaller &, DDS *, bool)
 Receive data from the net. More...
 
virtual void dump (ostream &strm) const
 dumps information about this object More...
 
int element_count (bool leaves=false) override
 Count the members of constructor types. More...
 
std::string FQN () const override
 
virtual AttrTableget_attr_table ()
 
virtual BaseTypeget_parent () const
 
BaseTypeget_var_index (int i)
 
Vars_iter get_vars_iter (int i)
 
virtual void intern_data ()
 Read data into this variable. More...
 
virtual void intern_data (ConstraintEvaluator &, DDS &)
 
virtual bool is_constructor_type () const
 Returns true if the instance is a constructor (i.e., Structure, Sequence or Grid) type variable. More...
 
virtual bool is_dap4 () const
 
virtual bool is_in_selection ()
 Is this variable part of the current selection? More...
 
virtual bool is_linear ()
 Check to see whether this variable can be printed simply. More...
 
virtual bool is_simple_type () const
 Returns true if the instance is a numeric, string or URL type variable. More...
 
virtual bool is_vector_type () const
 Returns true if the instance is a vector (i.e., array) type variable. More...
 
virtual int length () const
 The number of elements in a Sequence object. More...
 
virtual string name () const
 Returns the name of the class instance. More...
 
D4Sequenceoperator= (const D4Sequence &rhs)
 
virtual bool ops (BaseType *b, int op)
 Evaluate relational operators. More...
 
void print_dap4 (XMLWriter &xml, bool constrained=false) override
 
void print_decl (FILE *out, string space=" ", bool print_semi=true, bool constraint_info=false, bool constrained=false) override
 Print an ASCII representation of the variable structure. More...
 
void print_decl (ostream &out, string space=" ", bool print_semi=true, bool constraint_info=false, bool constrained=false) override
 Print an ASCII representation of the variable structure. More...
 
virtual void print_one_row (ostream &out, int row, string space, bool print_row_num=false)
 
void print_val (FILE *out, string space="", bool print_decl_p=true) override
 Prints the value of the variable. More...
 
virtual void print_val (ostream &out, string space="", bool print_decl_p=true)
 Prints the value of the variable. More...
 
virtual void print_val_by_rows (ostream &out, string space="", bool print_decl_p=true, bool print_row_numbers=true)
 
void print_xml (FILE *out, string space=" ", bool constrained=false) override
 
void print_xml (ostream &out, string space=" ", bool constrained=false) override
 
void print_xml_writer (XMLWriter &xml, bool constrained=false) override
 
virtual BaseTypeptr_duplicate ()
 
bool read () override
 Read the elements of Constructor marked for transmission. More...
 
virtual bool read_next_instance (bool filter)
 Read the next instance of the sequence While the rest of the variables' read() methods are assumed to return the entire variable in one call (modulo enhancements of the library to support streaming large variables), this class assumes that the underlying data store is returning data from a table of unknown size. Thus, D4Sequence::read() is assumed to return one instance (or element or row) of the sequence per call and return true when the EOF (end of the sequence) is reached. More...
 
virtual bool read_p ()
 Has this variable been read? More...
 
virtual D4SeqRowrow_value (size_t row)
 Get a whole row from the sequence. More...
 
virtual bool send_p ()
 Should this variable be sent? More...
 
virtual bool serialize (ConstraintEvaluator &, DDS &, Marshaller &, bool)
 Move data to the net, then remove them from the object. More...
 
virtual void serialize (D4StreamMarshaller &m, DMR &dmr, bool filter=false)
 Serialize the values of a D4Sequence This method assumes that the underlying data store cannot/does not return a count of items separately from the items themselves. For a data store that does, this method should probably be specialized to take advantage of that. Because the DAP4 spec requires that a sequence be prefixed by a count, this method reads the entire sequence into memory before sending it (and counts the number of elements in the the process). For a data store where the count is available a priori, this could be rewritten so that the count is sent and then each instance/element of the sequence sent in succession. More...
 
virtual void set_attr_table (const AttrTable &at)
 
void set_in_selection (bool state) override
 Set the in_selection property. More...
 
virtual void set_is_dap4 (const bool v)
 
virtual void set_length (int count)
 
virtual void set_name (const string &n)
 Sets the name of the class instance. More...
 
virtual void set_parent (BaseType *parent)
 
void set_read_p (bool state) override
 Set the 'read_p' property for the Constructor and its members. More...
 
void set_send_p (bool state) override
 
virtual void set_synthesized_p (bool state)
 
virtual void set_type (const Type &t)
 Sets the type of the class instance. More...
 
virtual void set_value (D4SeqValues &values)
 Set the internal value. The 'values' of a D4Sequence is a vector of vectors of BaseType* objects. Using this method does not perform a deep copy; the BaseType*s are copied so the caller should not free them. Note that this does set d_length but the read_p flag for the BaseTypes should all be set to keep the serializer from trying to read each of them. More...
 
virtual bool synthesized_p ()
 
virtual string toString ()
 
void transfer_attributes (AttrTable *at) override
 
virtual std::vector< BaseType * > * transform_to_dap2 (AttrTable *parent_attr_table)
 DAP4 to DAP2 transform. More...
 
void transform_to_dap4 (D4Group *root, Constructor *dest) override
 DAP2 to DAP4 transform. More...
 
virtual Type type () const
 Returns the type of the class instance. More...
 
virtual string type_name () const
 Returns the type of the class instance as a string. More...
 
unsigned int val2buf (void *, bool) override
 Loads class data. More...
 
virtual D4SeqValues value () const
 Get the values for this D4Sequence This method returns a reference to the values held by the instance. You should make sure that the instance really holds values before calling it! Do not free the BaseType*s contained in the vector of vectors. More...
 
virtual D4SeqValuesvalue_ref ()
 Get the sequence values by reference This method returns a reference to the D4Sequence's values, eliminating the copy of all the pointers. For large sequences, that could be a substantial number of values (even though they are 'just' pointers). More...
 
BaseTypevar (const string &n, btp_stack &s) override
 
BaseTypevar (const string &name, bool exact_match=true, btp_stack *s=nullptr) override
 btp_stack no longer needed; use back pointers (BaseType::get_parent()) More...
 
Vars_iter var_begin ()
 
Vars_iter var_end ()
 
Vars_riter var_rbegin ()
 
Vars_riter var_rend ()
 
virtual BaseTypevar_value (size_t row, const string &name)
 Get the BaseType pointer to the named variable of a given row. More...
 
virtual BaseTypevar_value (size_t row, size_t i)
 Get the BaseType pointer to the $i^{th}$ variable of row. More...
 
const vector< BaseType * > & variables () const
 
unsigned int width (bool constrained=false) const override
 
virtual D4Attributesattributes ()
 
virtual void set_attributes (D4Attributes *)
 
virtual void set_attributes_nocopy (D4Attributes *)
 

Static Public Member Functions

static AttrTablemake_dropped_vars_attr_table (vector< BaseType * > *dropped_vars)
 

Protected Member Functions

void m_duplicate (const BaseType &bt)
 Perform a deep copy. More...
 
void m_duplicate (const D4Sequence &s)
 
BaseTypem_exact_match (const string &name, btp_stack *s=nullptr)
 
BaseTypem_leaf_match (const string &name, btp_stack *s=nullptr)
 
void read_sequence_values (bool filter)
 Read a Sequence's value into memory. More...
 

Protected Attributes

int64_t d_length
 
D4SeqValues d_values
 
std::vector< BaseType * > d_vars
 

Friends

class D4SequenceTest
 

Detailed Description

Holds a sequence.

This is the interface for the class D4Sequence. A sequence contains a single set of variables, all at the same lexical level just like a Structure. Like a Structure, a D4Sequence may contain other compound types, including other D4Sequences. Unlike a Structure, a D4Sequence defines a pattern that is repeated N times for a sequence of N elements. It is useful to think of a D4Sequence as representing a table of values (like a relational database), with each row of the table corresponding to a D4Sequence instance.'' (This usage can be confusing, sinceinstance'' also refers to a particular item of class D4Sequence.) For example:

D4Sequence {
  String name;
  Int32 age;
} person;

This represents a Sequence of `‘person’' records, each instance of which contains a name and an age:

Fred       34
Ralph      23
Andrea     29
...

A D4Sequence can be arbitrarily long, which is to say that its length is not part of its declaration. A D4Sequence can contain other D4Sequences:

D4Sequence {
  String name;
  Int32 age;
  D4Sequence {
    String friend;
  } friend_list;
} person;
Fred       34     Norman
                  Andrea
                  Ralph
                  Lisa
Ralph      23     Norman
                  Andrea
                  Lisa
                  Marth
                  Throckmorton
                  Helga
                  Millicent
Andrea     29     Ralph
                  Natasha
                  Norman
...        ..     ...

Internally, the D4Sequence is represented by a vector of vectors. The members of the outer vector are the members of the D4Sequence. This includes the nested D4Sequences, as in the above example.

Because the length of a D4Sequence is indeterminate, there are changes to the behavior of the functions to read this class of data. The read() function for D4Sequence must be written so that successive calls return values for successive rows of the D4Sequence.

Similar to a C structure, you refer to members of D4Sequence elements with a .'' notation. For example, if the D4Sequence has a member D4Sequence calledTom'' and Tom has a member Float32 called shoe_size'', you can refer to Tom's shoe size as Tom.shoe_size''.

Definition at line 133 of file D4Sequence.h.

Member Typedef Documentation

◆ btp_stack

typedef stack<BaseType *> libdap::BaseType::btp_stack
inherited

Definition at line 149 of file BaseType.h.

◆ Vars_citer

typedef std::vector<BaseType*>::const_iterator libdap::Constructor::Vars_citer
inherited

Definition at line 64 of file Constructor.h.

◆ Vars_iter

typedef std::vector<BaseType*>::iterator libdap::Constructor::Vars_iter
inherited

Definition at line 65 of file Constructor.h.

◆ Vars_riter

typedef std::vector<BaseType*>::reverse_iterator libdap::Constructor::Vars_riter
inherited

Definition at line 66 of file Constructor.h.

Constructor & Destructor Documentation

◆ D4Sequence() [1/3]

libdap::D4Sequence::D4Sequence ( const string &  n)

The Sequence constructor.

The Sequence constructor requires only the name of the variable to be created. The name may be omitted, which will create a nameless variable. This may be adequate for some applications.

Parameters
nA string containing the name of the variable to be created.

Definition at line 96 of file D4Sequence.cc.

◆ D4Sequence() [2/3]

libdap::D4Sequence::D4Sequence ( const string &  n,
const string &  d 
)

The Sequence server-side constructor.

The Sequence server-side constructor requires the name of the variable to be created and the dataset name from which this variable is being created.

Parameters
nA string containing the name of the variable to be created.
dA string containing the name of the dataset from which this variable is being created.

Definition at line 111 of file D4Sequence.cc.

◆ D4Sequence() [3/3]

libdap::D4Sequence::D4Sequence ( const D4Sequence rhs)

The Sequence copy constructor.

Definition at line 117 of file D4Sequence.cc.

◆ ~D4Sequence()

libdap::D4Sequence::~D4Sequence ( )
virtual

Definition at line 140 of file D4Sequence.cc.

Member Function Documentation

◆ add_var()

void libdap::Constructor::add_var ( BaseType bt,
Part  part = nil 
)
overridevirtualinherited

Adds an element to a Constructor.

Parameters
btA pointer to the variable to add to this Constructor.
partNot used by this class, defaults to nil

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 323 of file Constructor.cc.

◆ add_var_nocopy()

void libdap::Constructor::add_var_nocopy ( BaseType bt,
Part  part = nil 
)
overridevirtualinherited

Adds an element to a Constructor.

Parameters
btA pointer to thee variable to add to this Constructor.
partNot used by this class, defaults to nil

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 345 of file Constructor.cc.

◆ attributes()

D4Attributes * libdap::BaseType::attributes ( )
virtualinherited

DAP4 Attribute methods

Definition at line 595 of file BaseType.cc.

◆ buf2val()

unsigned int libdap::Constructor::buf2val ( void **  val)
inlineoverridevirtualinherited

Reads the class data.

Reads the class data into the memory referenced by val. The caller should either allocate enough storage to val to hold the class data or set *val to null. If *val is NULL, memory will be allocated by this function with new(). If the memory is allocated this way, the caller is responsible for deallocating that memory. Array and values for simple types are stored as C would store an array.

Deprecated:
Use value() in the leaf classes.
Parameters
valA pointer to a pointer to the memory into which the class data will be copied. If the value pointed to is NULL, memory will be allocated to hold the data, and the pointer value modified accordingly. The calling program is responsible for deallocating the memory references by this pointer.
Returns
The size (in bytes) of the information copied to val.

Implements libdap::BaseType.

Definition at line 138 of file Constructor.h.

◆ check_semantics()

bool libdap::Constructor::check_semantics ( string &  msg,
bool  all = false 
)
overridevirtualinherited

Compare an object's current state with the semantics of its type.

This function checks the class instance for internal consistency. This is important to check for complex constructor classes. For BaseType, an object is semantically correct if it has both a non-null name and type.

For example, an Int32 instance would return FALSE if it had no name or no type defined. A Grid instance might return FALSE for more complex reasons, such as having Map arrays of the wrong size or shape.

This function is used by the DDS class, and will rarely, if ever, be explicitly called by a DODS application program. A variable must pass this test before it is sent, but there may be many other stages in a retrieve operation where it would fail.

Returns
Returns FALSE when the current state violates some aspect of the type semantics, TRUE otherwise.
Parameters
msgA returned string, containing a message indicating the source of any problem.
allFor complex constructor types (Grid, Sequence, Structure), this flag indicates whether to check the semantics of the member variables, too.
See also
DDS::check_semantics

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 654 of file Constructor.cc.

◆ clauses()

D4FilterClauseList & libdap::D4Sequence::clauses ( )

Access the filter clauses for this D4Sequence.

When a filter is supplied with a DAP4 constraint, the expression is parsed and one or more D4FilterClause objects are built and stored in a D4FilterClauseList bound to the D4Sequence to be filtered.

Returns
A reference to this D4Sequence's filter clause list
See also
D4FilterClauseList

Definition at line 354 of file D4Sequence.cc.

◆ clear_local_data()

void libdap::D4Sequence::clear_local_data ( )
virtual

Remove any read or set data in the private data of the variable, setting read_p() to false. Used to clear any dynamically allocated storage that holds (potentially large) data. For the simple types, this no-op version is all that's needed. Vector and some other classes define a special version and have serialize() implementations that call it to free data as soon as possible after sending it.

Note
Added 7/5/15 jhrg
Any specialization of this should make sure to reset the read_p property.

Reimplemented from libdap::BaseType.

Definition at line 146 of file D4Sequence.cc.

◆ compute_checksum()

void libdap::Constructor::compute_checksum ( Crc32 checksum)
overridevirtualinherited

include the data for this variable in the checksum DAP4 includes a checksum with every data response. This method adds the variable's data to that checksum.

Parameters
checksumA Crc32 instance that holds the current checksum.

Implements libdap::BaseType.

Definition at line 462 of file Constructor.cc.

◆ d4_ops()

bool libdap::BaseType::d4_ops ( BaseType b,
int  op 
)
virtualinherited

Evaluator a relop for DAP4.

This method is used by the filter expression evaluation code in DAP4. Each of the 'data type' classes that support relops must overload this method. In an expression of the form arg1 op arg2, this object is arg1, the parameter 'b' is arg2 and op is the relational operator.

Note
I used the same relop codes for DAP4 as in the DAP2 parser/scanner which makes for some coupling between them, but cuts way down on the duplication of the evaluator logic, which is somewhat involved.
Parameters
bThe second argument in the relational expression
opThe infix relational operator
Returns
True if the expression is true, False otherwise.

Reimplemented in libdap::Byte, libdap::Float32, libdap::Float64, libdap::Int16, libdap::Int32, libdap::Int64, libdap::Int8, libdap::Str, and libdap::UInt64.

Definition at line 1278 of file BaseType.cc.

◆ dataset()

string libdap::BaseType::dataset ( ) const
virtualinherited

Returns the name of the dataset used to create this instance.

A dataset from which the data is to be read. The meaning of this string will vary among different types of data sources. It may be the name of a data file or an identifier used to read data from a relational database.

Definition at line 354 of file BaseType.cc.

◆ del_var() [1/2]

void libdap::Constructor::del_var ( const string &  n)
virtualinherited

Remove an element from a Constructor.

Note
New version. There is a subtle change in that this version will remove all variables in this Constructor with name 'n' while the old version would just remove the first variable.
Parameters
nname of the variable to remove

Definition at line 362 of file Constructor.cc.

◆ del_var() [2/2]

void libdap::Constructor::del_var ( Vars_iter  i)
virtualinherited

Delete the BaseType* and erase the iterator .

Note
It is OK to call this with an iterator that points to nullptr.
Parameters
iThe iterator that points to the BaseType.

Definition at line 376 of file Constructor.cc.

◆ deserialize() [1/2]

void libdap::D4Sequence::deserialize ( D4StreamUnMarshaller um,
DMR dmr 
)
virtual

The DAP4 deserialization method.

Parameters
um
dmr
Exceptions
Erroror InternalErr

Reimplemented from libdap::Constructor.

Definition at line 328 of file D4Sequence.cc.

◆ deserialize() [2/2]

virtual bool libdap::D4Sequence::deserialize ( UnMarshaller um,
DDS dds,
bool  reuse 
)
inlinevirtual

Receive data from the net.

Receives data from the network connection identified by the source parameter. The data is put into the class data buffer according to the input dds.

This function is only used on the client side of the DODS client/server connection.

Parameters
umAn UnMarshaller that knows how to deserialize data types
ddsThe Data Descriptor Structure object corresponding to this dataset. See The DODS User Manual for information about this structure. This would have been received from the server in an earlier transmission.
reuseA boolean value, indicating whether the class internal data storage can be reused or not. If this argument is TRUE, the class buffer is assumed to be large enough to hold the incoming data, and it is not reallocated. If FALSE, new storage is allocated. If the internal buffer has not been allocated at all, this argument has no effect.
Returns
Always returns TRUE.
Exceptions
Errorwhen a problem reading from the UnMarshaller is found.
See also
DDS

Reimplemented from libdap::Constructor.

Definition at line 209 of file D4Sequence.h.

◆ dump()

void libdap::D4Sequence::dump ( ostream &  strm) const
virtual

dumps information about this object

Displays the pointer value of this instance and information about this instance.

Parameters
strmC++ i/o stream to dump the information to
Returns
void

Reimplemented from libdap::Constructor.

Definition at line 505 of file D4Sequence.cc.

◆ element_count()

int libdap::Constructor::element_count ( bool  leaves = false)
overridevirtualinherited

Count the members of constructor types.

Return a count of the total number of variables in this variable. This is used to count the number of variables held by a constructor variable - for simple type and vector variables it always returns 1.

For compound data types, there are two ways to count members. You can count the members, or you can count the simple members and add that to the count of the compound members. For example, if a Structure contains an Int32 and another Structure that itself contains two Int32 members, the element count of the top-level structure could be two (one Int32 and one Structure) or three (one Int32 by itself and two Int32's in the subsidiary Structure). Use the leaves parameter to control which kind of counting you desire.

Returns
Returns 1 for simple types. For compound members, the count depends on the leaves argument.
Parameters
leavesThis parameter is only relevant if the object contains other compound data types. If FALSE, the function counts only the data variables mentioned in the object's declaration. If TRUE, it counts the simple members, and adds that to the sum of the counts for the compound members. This parameter has no effect for simple type variables.

Reimplemented from libdap::BaseType.

Definition at line 115 of file Constructor.cc.

◆ FQN()

string libdap::Constructor::FQN ( ) const
overridevirtualinherited

Return the FQN for this variable. This will include the D4 Group component of the name.

Returns
The FQN in a string

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Group.

Definition at line 102 of file Constructor.cc.

◆ get_attr_table()

AttrTable & libdap::BaseType::get_attr_table ( )
virtualinherited

Get this variable's AttrTable. It's generally a bad idea to return a reference to a contained object, but in this case it seems that building an interface inside BaseType is overkill.

Use the AttrTable methods to manipulate the table.

Definition at line 578 of file BaseType.cc.

◆ get_parent()

BaseType * libdap::BaseType::get_parent ( ) const
virtualinherited

Return a pointer to the Constructor or Vector which holds (contains) this variable. If this variable is at the top level, this method returns null.

Returns
A BaseType pointer to the variable's parent.

Definition at line 747 of file BaseType.cc.

◆ get_var_index()

BaseType * libdap::Constructor::get_var_index ( int  i)
inherited

Return the BaseType pointer for the ith variable.

Parameters
iThis index
Returns
The corresponding BaseType*.

Definition at line 313 of file Constructor.cc.

◆ get_vars_iter()

Constructor::Vars_iter libdap::Constructor::get_vars_iter ( int  i)
inherited

Return the iterator for the ith variable.

Parameters
ithe index
Returns
The corresponding Vars_iter

Definition at line 304 of file Constructor.cc.

◆ intern_data() [1/2]

void libdap::D4Sequence::intern_data ( )
virtual

Read data into this variable.

Parameters
evalEvaluator for a constraint expression
dmrDMR for the whole dataset

Reimplemented from libdap::Constructor.

Definition at line 217 of file D4Sequence.cc.

◆ intern_data() [2/2]

virtual void libdap::D4Sequence::intern_data ( ConstraintEvaluator eval,
DDS dds 
)
inlinevirtual

Similar to using serialize() and deserialize() together in one object. Data are read as for serialize and those values are stored in the objects as deserialize() does but does not write and then read data to/from a stream.

This method is defined by the various data type classes. It calls the read() abstract method. Unlike serialize(), this method does not clear the memory use to hold the data values, so the caller should make sure to delete the DDS or the variable as soon as possible.

Parameters
evalUse this as the constraint expression evaluator.
ddsThe Data Descriptor Structure object corresponding to this dataset. See The DODS User Manual for information about this structure.

Reimplemented from libdap::Constructor.

Definition at line 203 of file D4Sequence.h.

◆ is_constructor_type()

bool libdap::BaseType::is_constructor_type ( ) const
virtualinherited

Returns true if the instance is a constructor (i.e., Structure, Sequence or Grid) type variable.

Returns
True if the instance is a Structure, Sequence or Grid, False otherwise.

Definition at line 408 of file BaseType.cc.

◆ is_dap4()

virtual bool libdap::BaseType::is_dap4 ( ) const
inlinevirtualinherited

Definition at line 181 of file BaseType.h.

◆ is_in_selection()

bool libdap::BaseType::is_in_selection ( )
virtualinherited

Is this variable part of the current selection?

Does this variable appear in either the selection part or as a function argument in the current constrain expression. If this property is set (true) then implementations of the read() method should read this variable.

Note
This method does not check, nor does it know about the semantics of, string arguments passed to functions. Those functions might include variable names in strings; they are responsible for reading those variables. See the grid (func_grid_select()) for an example.
See also
BaseType::read()

Definition at line 699 of file BaseType.cc.

◆ is_linear()

bool libdap::Constructor::is_linear ( )
virtualinherited

Check to see whether this variable can be printed simply.

True if the instance can be flattened and printed as a single table of values. For Arrays and Grids this is always false. For Structures and Sequences the conditions are more complex. The implementation provided by this class always returns false. Other classes should override this implementation.

Returns
True if the instance can be printed as a single table of values, false otherwise.

Reimplemented in libdap::Sequence, and libdap::Structure.

Definition at line 683 of file Constructor.cc.

◆ is_simple_type()

bool libdap::BaseType::is_simple_type ( ) const
virtualinherited

Returns true if the instance is a numeric, string or URL type variable.

Returns
True if the instance is a scalar numeric, String or URL variable, False otherwise. Arrays (even of simple types) return False.
See also
is_vector_type()

Definition at line 389 of file BaseType.cc.

◆ is_vector_type()

bool libdap::BaseType::is_vector_type ( ) const
virtualinherited

Returns true if the instance is a vector (i.e., array) type variable.

Returns
True if the instance is an Array, False otherwise.

Definition at line 398 of file BaseType.cc.

◆ length()

virtual int libdap::D4Sequence::length ( ) const
inlinevirtual

The number of elements in a Sequence object.

Note
This is not the number of items in a row, but the number of rows in the complete sequence object.
Returns
0 if the number of elements is unknown, else return the number of elements.

Reimplemented from libdap::BaseType.

Definition at line 193 of file D4Sequence.h.

◆ m_duplicate() [1/2]

void libdap::BaseType::m_duplicate ( const BaseType bt)
protectedinherited

Perform a deep copy.

Perform a deep copy. Copies the values of bt into *this. Pointers are dereferenced and their values are copied into a newly allocated instance.

Parameters
btThe source object.

Definition at line 86 of file BaseType.cc.

◆ m_duplicate() [2/2]

void libdap::D4Sequence::m_duplicate ( const D4Sequence s)
protected

Definition at line 62 of file D4Sequence.cc.

◆ m_exact_match()

BaseType * libdap::Constructor::m_exact_match ( const string &  name,
btp_stack *  s = nullptr 
)
protectedinherited

Definition at line 237 of file Constructor.cc.

◆ m_leaf_match()

BaseType * libdap::Constructor::m_leaf_match ( const string &  name,
btp_stack *  s = nullptr 
)
protectedinherited

Definition at line 212 of file Constructor.cc.

◆ make_dropped_vars_attr_table()

AttrTable * libdap::Constructor::make_dropped_vars_attr_table ( vector< BaseType * > *  dropped_vars)
staticinherited

Definition at line 716 of file Constructor.cc.

◆ name()

string libdap::BaseType::name ( ) const
virtualinherited

Returns the name of the class instance.

Definition at line 316 of file BaseType.cc.

◆ operator=()

D4Sequence & libdap::D4Sequence::operator= ( const D4Sequence rhs)

Definition at line 157 of file D4Sequence.cc.

◆ ops()

bool libdap::BaseType::ops ( BaseType b,
int  op 
)
virtualinherited

Evaluate relational operators.

This method contains the relational operators used by the constraint expression evaluator in the DDS class. Each class that wants to be able to evaluate relational expressions must overload this function. The implementation in BaseType throws an InternalErr exception. The DAP library classes Byte, ..., Url provide specializations of this method. It is not meaningful for classes such as Array because relational expressions using Array are not supported.

The op argument refers to a table generated by bison from the constraint expression parser. Use statements like the following to correctly interpret its value:

switch (op) {
    case EQUAL: return i1 == i2;
    case NOT_EQUAL: return i1 != i2;
    case GREATER: return i1 > i2;
    case GREATER_EQL: return i1 >= i2;
    case LESS: return i1 < i2;
    case LESS_EQL: return i1 <= i2;
    case REGEXP: throw Error("Regular expressions are not supported for integer values");
    default: throw Error("Unknown operator");
}

This function is used by the constraint expression evaluator.

Parameters
bCompare the value of this instance with b.
opAn integer index indicating which relational operator is implied. Choose one from the following: EQUAL, NOT_EQUAL, GREATER, GREATER_EQL, LESS, LESS_EQL, and REGEXP.
Returns
The boolean value of the comparison.
See also
BaseType::d4_ops(BaseType *, int)

Reimplemented in libdap::D4Opaque, libdap::Byte, libdap::D4Enum, libdap::Float32, libdap::Float64, libdap::Int16, libdap::Int32, libdap::Int64, libdap::Int8, libdap::Str, libdap::UInt16, libdap::UInt32, and libdap::UInt64.

Definition at line 1252 of file BaseType.cc.

◆ print_dap4()

void libdap::Constructor::print_dap4 ( XMLWriter xml,
bool  constrained = false 
)
overridevirtualinherited

Write the DAP4 XML representation for this variable. This method is used to build the DAP4 DMR response object.

Parameters
xmlAn XMLWriter that will do the serialization
constrainedTrue if the response should show the variables subject to the current constraint expression.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Group.

Definition at line 631 of file Constructor.cc.

◆ print_decl() [1/2]

void libdap::Constructor::print_decl ( FILE *  out,
string  space = "    ",
bool  print_semi = true,
bool  constraint_info = false,
bool  constrained = false 
)
overridevirtualinherited

Print an ASCII representation of the variable structure.

Write the variable's declaration in a C-style syntax. This function is used to create textual representation of the Data Descriptor Structure (DDS). See The DODS User Manual for information about this structure.

A simple array declaration might look like this:

Float64 lat[lat = 180];

While a more complex declaration (for a Grid, in this case), would look like this:

Grid {
ARRAY:
Int32 sst[time = 404][lat = 180][lon = 360];
MAPS:
Float64 time[time = 404];
Float64 lat[lat = 180];
Float64 lon[lon = 360];
} sst;
Parameters
outThe output stream on which to print the declaration.
spaceEach line of the declaration will begin with the characters in this string. Usually used for leading spaces.
print_semiA boolean value indicating whether to print a semicolon at the end of the declaration.
constraint_infoA boolean value indicating whether constraint information is to be printed with the declaration. If the value of this parameter is TRUE, print_decl() prints the value of the variable's send_p() flag after the declaration.
constrainedIf this boolean value is TRUE, the variable's declaration is only printed if is the send_p() flag is TRUE. If a constraint expression is in place, and this variable is not requested, the send_p() flag is FALSE.
See also
DDS
DDS::CE

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 520 of file Constructor.cc.

◆ print_decl() [2/2]

void libdap::Constructor::print_decl ( ostream &  out,
string  space = "    ",
bool  print_semi = true,
bool  constraint_info = false,
bool  constrained = false 
)
overridevirtualinherited

Print an ASCII representation of the variable structure.

Write the variable's declaration in a C-style syntax. This function is used to create textual representation of the Data Descriptor Structure (DDS). See The DODS User Manual for information about this structure.

A simple array declaration might look like this:

Float64 lat[lat = 180];

While a more complex declaration (for a Grid, in this case), would look like this:

Grid {
ARRAY:
Int32 sst[time = 404][lat = 180][lon = 360];
MAPS:
Float64 time[time = 404];
Float64 lat[lat = 180];
Float64 lon[lon = 360];
} sst;
Parameters
outThe output stream on which to print the declaration.
spaceEach line of the declaration will begin with the characters in this string. Usually used for leading spaces.
print_semiA boolean value indicating whether to print a semicolon at the end of the declaration.
constraint_infoA boolean value indicating whether constraint information is to be printed with the declaration. If the value of this parameter is TRUE, print_decl() prints the value of the variable's send_p() flag after the declaration.
constrainedIf this boolean value is TRUE, the variable's declaration is only printed if is the send_p() flag is TRUE. If a constraint expression is in place, and this variable is not requested, the send_p() flag is FALSE.
See also
DDS
DDS::CE

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 529 of file Constructor.cc.

◆ print_one_row()

void libdap::D4Sequence::print_one_row ( ostream &  out,
int  row,
string  space,
bool  print_row_num = false 
)
virtual

Definition at line 425 of file D4Sequence.cc.

◆ print_val() [1/2]

void libdap::Constructor::print_val ( FILE *  out,
string  space = "",
bool  print_decl_p = true 
)
overridevirtualinherited

Prints the value of the variable.

Prints the value of the variable, with its declaration. This function is primarily intended for debugging DODS applications. However, it can be overloaded and used to do some useful things. Take a look at the asciival and writeval clients, both of which overload this to output the values of variables in different ways.

Parameters
outThe output stream on which to print the value.
spaceThis value is passed to the print_decl() function, and controls the leading spaces of the output.
print_decl_pA boolean value controlling whether the variable declaration is printed as well as the value.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid, and libdap::Sequence.

Definition at line 553 of file Constructor.cc.

◆ print_val() [2/2]

void libdap::D4Sequence::print_val ( ostream &  out,
string  space = "",
bool  print_decl_p = true 
)
virtual

Prints the value of the variable.

Prints the value of the variable, with its declaration. This function is primarily intended for debugging DODS applications. However, it can be overloaded and used to do some useful things. Take a look at the asciival and writeval clients, both of which overload this to output the values of variables in different ways.

Parameters
outThe output ostream on which to print the value.
spaceThis value is passed to the print_decl() function, and controls the leading spaces of the output.
print_decl_pA boolean value controlling whether the variable declaration is printed as well as the value.

Reimplemented from libdap::Constructor.

Definition at line 490 of file D4Sequence.cc.

◆ print_val_by_rows()

void libdap::D4Sequence::print_val_by_rows ( ostream &  out,
string  space = "",
bool  print_decl_p = true,
bool  print_row_numbers = true 
)
virtual

Definition at line 467 of file D4Sequence.cc.

◆ print_xml() [1/2]

void libdap::Constructor::print_xml ( FILE *  out,
string  space = "    ",
bool  constrained = false 
)
overridevirtualinherited
Deprecated:

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 583 of file Constructor.cc.

◆ print_xml() [2/2]

void libdap::Constructor::print_xml ( ostream &  out,
string  space = "    ",
bool  constrained = false 
)
overridevirtualinherited
Deprecated:

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 594 of file Constructor.cc.

◆ print_xml_writer()

void libdap::Constructor::print_xml_writer ( XMLWriter xml,
bool  constrained = false 
)
overridevirtualinherited

Write the XML representation of this variable. This method is used to build the DDX XML response.

Parameters
outDestination output stream
spaceUse this to indent child declarations. Default is "".
constrainedIf true, only print this if it's part part of the current projection. Default is False.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 602 of file Constructor.cc.

◆ ptr_duplicate()

BaseType * libdap::D4Sequence::ptr_duplicate ( )
virtual

Clone this instance. Allocate a new instance and copy *this into it. This method must perform a deep copy.

@note This method should \e not copy data values, but must copy all
other fields in the object.
Returns
A newly allocated copy of this.

Implements libdap::BaseType.

Definition at line 123 of file D4Sequence.cc.

◆ read()

bool libdap::Constructor::read ( )
overridevirtualinherited

Read the elements of Constructor marked for transmission.

Iterate over the top level members of the Constructor and read all of them that have the 'send_p' property set to true. Assume the read() methods correctly set the 'read_p' property. Once done, set 'read_p' for the Constructor itself (but not for the members, that is left up to their individual read() methods).

Returns
returns false; the return value is a relic.

Reimplemented from libdap::BaseType.

Definition at line 393 of file Constructor.cc.

◆ read_next_instance()

bool libdap::D4Sequence::read_next_instance ( bool  filter)
virtual

Read the next instance of the sequence While the rest of the variables' read() methods are assumed to return the entire variable in one call (modulo enhancements of the library to support streaming large variables), this class assumes that the underlying data store is returning data from a table of unknown size. Thus, D4Sequence::read() is assumed to return one instance (or element or row) of the sequence per call and return true when the EOF (end of the sequence) is reached.

For each call to read, the values for each of the sequence's members are expected to have been loaded into the member's BaseType variables; this method will copy them out and store then in the D4Sequence's internal storage. This method always returns the next instance that satisfies the CE when 'filter' is true.

Note
This method is called by D4Sequence::serialize() and it will evaluate the CE for each set of values read.
Parameters
dmr
eval
filter
Returns
False when read() indicates that the EOF was found, true otherwise.

Definition at line 188 of file D4Sequence.cc.

◆ read_p()

bool libdap::BaseType::read_p ( )
virtualinherited

Has this variable been read?

Returns true if the value(s) for this variable have been read from the data source, otherwise returns false. This method is used to determine when values need to be read using the read() method. When read_p() returns true, this library assumes that buf2val() (and other methods such as get_vec()) can be used to access the value(s) of a variable.

Returns
True if the variable's value(s) have been read, false otherwise.

Definition at line 476 of file BaseType.cc.

◆ read_sequence_values()

void libdap::D4Sequence::read_sequence_values ( bool  filter)
protected

Read a Sequence's value into memory.

This is a helper method for serialize() that enables the code to recursively read values for child sequences. This method assumes that the D4Sequence::read() method does not call itself recursively for child sequences, as is the case with DAP2 sequences. If you have a data store that requires the outer-most sequence to read values for its child sequences, you will need to specialize this method. See also the methods associated with the sequence values because unlike DAP2 sequences, in DAP4 the sequences hold all their values in memory before writing them out.

Note
We may revisit the idea that values must be held in memory before being written. That is a consequence of using a length prefix instead of a series of sentinel values.
Parameters
filterTrue if the/a file expression bound to this sequence should be evaluated.
See also
set_value()

Definition at line 243 of file D4Sequence.cc.

◆ row_value()

D4SeqRow * libdap::D4Sequence::row_value ( size_t  row)
virtual

Get a whole row from the sequence.

Parameters
rowGet row number row from the sequence.
Returns
A BaseTypeRow object (vector<BaseType *>). Null if there's no such row number as row.

Definition at line 386 of file D4Sequence.cc.

◆ send_p()

bool libdap::BaseType::send_p ( )
virtualinherited

Should this variable be sent?

Returns the state of the send_p property. If true, this variable should be sent to the client, if false, it should not. If no constraint expression (CE) has been evaluated, this property is true for all variables in a data source (i.e., for all the variables listed in a DDS). If a CE has been evaluated, this property is true only for those variables listed in the projection part of the CE.

Returns
True if the variable should be sent to the client, false otherwise.

Definition at line 550 of file BaseType.cc.

◆ serialize() [1/2]

virtual bool libdap::D4Sequence::serialize ( ConstraintEvaluator eval,
DDS dds,
Marshaller m,
bool  ce_eval 
)
inlinevirtual

Move data to the net, then remove them from the object.

Sends the data from the indicated (local) dataset through the connection identified by the Marshaller parameter. If the data is not already incorporated into the DDS object, read the data from the dataset. Once the data are sent (written to the Marshaller), they are deleted from the object and the object state is reset so that they will be read again if the read() method is called.

This function is only used on the server side of the client/server connection, and is generally only called from the ResponseBuilder functions. It has no BaseType implementation; each datatype child class supplies its own implementation.

Parameters
evalUse this as the constraint expression evaluator.
ddsThe Data Descriptor Structure object corresponding to this dataset. See The DODS User Manual for information about this structure.
mA marshaller used to serialize data types
ce_evalA boolean value indicating whether to evaluate the DODS constraint expression that may accompany this dataset. The constraint expression is stored in the dds.
Returns
This method always returns true. Older versions used the return value to signal success or failure.
Note
We changed the default behavior of this method so that it calls BaseType::clear_local_data() once the values are sent. This, combined with the behavior that read() is called by this method just before data are sent, means that data for any given variable remain in memory for the shortest time possible. Furthermore, since variables are serialized one at a time, no more than one variable's data will be in memory at any given time when using the default behavior. Some code - code that uses intern_data() or server functions - might alter this default behavior. Only Array (i.e. Vector), Sequence, D4Sequence and D4Opaque types actually hold data in dynamically allocated memory, so sonly those types have the new/changed behavior. This change was made on 7/5/15.
Exceptions
InternalErr.
Error.
See also
DDS

Reimplemented from libdap::Constructor.

Definition at line 206 of file D4Sequence.h.

◆ serialize() [2/2]

void libdap::D4Sequence::serialize ( D4StreamMarshaller m,
DMR dmr,
bool  filter = false 
)
virtual

Serialize the values of a D4Sequence This method assumes that the underlying data store cannot/does not return a count of items separately from the items themselves. For a data store that does, this method should probably be specialized to take advantage of that. Because the DAP4 spec requires that a sequence be prefixed by a count, this method reads the entire sequence into memory before sending it (and counts the number of elements in the the process). For a data store where the count is available a priori, this could be rewritten so that the count is sent and then each instance/element of the sequence sent in succession.

If this method is specialized, once the data are loaded into the D4SeqValues instance, make sure to set d_length and make sure to set_read_p for each BaseType in D4SeqValues.

Parameters
mStream data sink
dmrDMR object for the evaluator
evalCE Evaluator object
filterTrue if the CE should be evaluated, false otherwise.

Reimplemented from libdap::Constructor.

Definition at line 306 of file D4Sequence.cc.

◆ set_attr_table()

void libdap::BaseType::set_attr_table ( const AttrTable at)
virtualinherited

Set this variable's attribute table.

Parameters
atSource of the attributes.

Definition at line 586 of file BaseType.cc.

◆ set_attributes()

void libdap::BaseType::set_attributes ( D4Attributes attrs)
virtualinherited

Definition at line 602 of file BaseType.cc.

◆ set_attributes_nocopy()

void libdap::BaseType::set_attributes_nocopy ( D4Attributes attrs)
virtualinherited

Definition at line 608 of file BaseType.cc.

◆ set_in_selection()

void libdap::Constructor::set_in_selection ( bool  state)
overridevirtualinherited

Set the in_selection property.

Set the in_selection property for this variable and all of its children.

Parameters
stateSet the property value to state.

Reimplemented from libdap::BaseType.

Definition at line 694 of file Constructor.cc.

◆ set_is_dap4()

virtual void libdap::BaseType::set_is_dap4 ( const bool  v)
inlinevirtualinherited

Definition at line 182 of file BaseType.h.

◆ set_length()

virtual void libdap::D4Sequence::set_length ( int  count)
inlinevirtual

Set the length of the sequence.

Parameters
count

Reimplemented from libdap::BaseType.

Definition at line 199 of file D4Sequence.h.

◆ set_name()

void libdap::BaseType::set_name ( const string &  n)
virtualinherited

Sets the name of the class instance.

Reimplemented in libdap::Vector.

Definition at line 340 of file BaseType.cc.

◆ set_parent()

void libdap::BaseType::set_parent ( BaseType parent)
virtualinherited

Set the parent property for this variable.

Note
Added ability to set parent to null. 10/19/12 jhrg
Parameters
parentPointer to the Constructor of Vector parent variable or null if the variable has no parent (if it is at the top-level of a DAP2/3 DDS).
Exceptions
InternalErrthrown if called with anything other than a Constructor, Vector or Null.

Definition at line 729 of file BaseType.cc.

◆ set_read_p()

void libdap::Constructor::set_read_p ( bool  state)
overridevirtualinherited

Set the 'read_p' property for the Constructor and its members.

This method sets read_p for all of the Constructor. The read() method is much more selective and only sets read_p for the Constructor itself, leaving the value of the property of the members up to their read() methods. Calling this with false will clear the property of all the member variables.

Parameters
stateSet the read_p property to this state.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Group.

Definition at line 150 of file Constructor.cc.

◆ set_send_p()

void libdap::Constructor::set_send_p ( bool  state)
overridevirtualinherited

Sets the value of the send_p flag. This function is meant to be called from within the constraint evaluator of other code which determines that this variable should be returned to the client. Data are ready to be sent when both the d_is_send and d_is_read flags are set to TRUE.

Parameters
stateThe logical state to set the send_p flag.

Reimplemented from libdap::BaseType.

Reimplemented in libdap::D4Group.

Definition at line 129 of file Constructor.cc.

◆ set_synthesized_p()

void libdap::BaseType::set_synthesized_p ( bool  state)
virtualinherited

Set the synthesized flag. Before setting this flag be sure to set the read_p() state. Once this flag is set you cannot alter the state of the read_p flag!

See also
synthesized_p()

Definition at line 459 of file BaseType.cc.

◆ set_type()

void libdap::BaseType::set_type ( const Type t)
virtualinherited

Sets the type of the class instance.

Definition at line 368 of file BaseType.cc.

◆ set_value()

virtual void libdap::D4Sequence::set_value ( D4SeqValues values)
inlinevirtual

Set the internal value. The 'values' of a D4Sequence is a vector of vectors of BaseType* objects. Using this method does not perform a deep copy; the BaseType*s are copied so the caller should not free them. Note that this does set d_length but the read_p flag for the BaseTypes should all be set to keep the serializer from trying to read each of them.

Parameters
values

Definition at line 271 of file D4Sequence.h.

◆ synthesized_p()

bool libdap::BaseType::synthesized_p ( )
virtualinherited

Returns true if the variable is a synthesized variable. A synthesized variable is one that is added to the dataset by the server (usually with a ‘projection function’.

Definition at line 448 of file BaseType.cc.

◆ toString()

string libdap::BaseType::toString ( )
virtualinherited

Write out the object's internal fields in a string. To be used for debugging when regular inspection w/ddd or gdb isn't enough.

Returns
A string which shows the object's internal stuff.

Reimplemented in libdap::Sequence.

Definition at line 180 of file BaseType.cc.

◆ transfer_attributes()

void libdap::Constructor::transfer_attributes ( AttrTable at_container)
overridevirtualinherited

Transfer attributes from a DAS object into this variable. Because of the rough history of the DAS object and the way that various server code built the DAS, this is necessarily a heuristic process. The intent is that this method will be overridden by handlers that need to look for certain patterns in the DAS (e.g., hdf4's odd variable_dim_n; where n = 0, 1, 2, ...) attribute containers.

There should be a one-to-one mapping between variables and attribute containers. However, in some cases one variable has attributes spread across several top level containers and in some cases one container is used by several variables

Note
This method is technically unnecessary because a server (or client) can easily add attributes directly using the DDS::get_attr_table or BaseType::get_attr_table methods and then poke values in using any of the methods AttrTable provides. This method exists to ease the transition to DDS objects which contain attribute information for the existing servers (Since they all make DAS objects separately from the DDS). They could be modified to use the same AttrTable methods but operate on the AttrTable instances in a DDS/BaseType instead of those in a DAS.
Parameters
at_containerTransfer attributes from this container.
Returns
void

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid.

Definition at line 703 of file Constructor.cc.

◆ transform_to_dap2()

std::vector< BaseType * > * libdap::BaseType::transform_to_dap2 ( AttrTable parent_attr_table)
virtualinherited

DAP4 to DAP2 transform.

For the current BaseType, return a DAP2 'copy' of the variable.

Note
For most DAP4 types, in this implementation of DAP2 the corresponding DAP4 type is the same. These types have a different representations in DAP2 and DAP4: Sequences (which are D4Sequences in the DAP4 implementation),
  • Grids (which are semantically subsumed by coverages in DAP4)
  • Arrays (which use shared dimensions in DAP4)

Additionally DAP4 adds the following types:

  • UInt8, Int8, and Char which map to Byte in DAP2.
  • Int64, Unit64 which have no natural representation in DAP2.
  • Opaque Possible Byte stuff[] plus metadata?
  • Enum's can be represented as Int32.
  • Groups, with the exception of the root group "disappear" into the names of their member variables. Specifically the Group name is add as a prefix followed by a "/" separator to the names of all of the Group's member groups variables.
Parameters
TheAttrTable pointer parent_attr_table is used by Groups, which disappear from the DAP2 representation. Their children are returned in the the BAseType vector their attributes are added to parent_attr_table;
Returns
A pointer to a vector of BaseType pointers (right?). In most cases this vector will contain a single pointer but DAP4 types 'disappear' such as Group will return all of their member variables in the vector. DAP4 types with no representation in DAP2 (ex: UInt64) the will return a NULL pointer and so this must be tested!

Reimplemented in libdap::Array, libdap::Byte, libdap::D4Enum, libdap::D4Group, libdap::D4Opaque, libdap::Int64, libdap::Int8, libdap::Structure, and libdap::UInt64.

Definition at line 255 of file BaseType.cc.

◆ transform_to_dap4()

void libdap::Constructor::transform_to_dap4 ( D4Group root,
Constructor container 
)
overridevirtualinherited

DAP2 to DAP4 transform.

For the current BaseType, return a DAP4 'copy' of the variable.

Note
For most DAP2 types, in this implementation of DAP4 the corresponding DAP4 type is the same. The different types are Sequences (which are D4Sequences in the DAP4 implementation), Grids (which are coverages) and Arrays (which use shared dimensions).
Parameters
rootThe root group that should hold this new variable. Add Group-level stuff here (e.g., D4Dimensions).
containerAdd the new variable to this container.
Returns
A pointer to the transformed variable

Reimplemented from libdap::BaseType.

Reimplemented in libdap::Grid, libdap::Sequence, and libdap::Structure.

Definition at line 84 of file Constructor.cc.

◆ type()

Type libdap::BaseType::type ( ) const
virtualinherited

Returns the type of the class instance.

Definition at line 361 of file BaseType.cc.

◆ type_name()

string libdap::BaseType::type_name ( ) const
virtualinherited

Returns the type of the class instance as a string.

Definition at line 375 of file BaseType.cc.

◆ val2buf()

unsigned int libdap::Constructor::val2buf ( void *  val,
bool  reuse 
)
inlineoverridevirtualinherited

Loads class data.

Store the value pointed to by val in the object's internal buffer. This function does not perform any checks, so users must be sure that the thing pointed to can actually be stored in the object's buffer.

Only simple objects (Int, Float, Byte, and so on) and arrays of these simple objects may be stored using this function. To put data into more complex constructor types, use the functions provided by that class.

Deprecated:
Use set_value() in the leaf classes.
Parameters
valA pointer to the data to be inserted into the class data buffer.
reuseA boolean value, indicating whether the class internal data storage can be reused or not. If this argument is TRUE, the class buffer is assumed to be large enough to hold the incoming data, and it is not reallocated. If FALSE, new storage is allocated. If the internal buffer has not been allocated at all, this argument has no effect. This is currently used only in the Vector class.
Returns
The size (in bytes) of the information copied from val.
See also
Grid
Vector::val2buf

Implements libdap::BaseType.

Definition at line 135 of file Constructor.h.

◆ value()

virtual D4SeqValues libdap::D4Sequence::value ( ) const
inlinevirtual

Get the values for this D4Sequence This method returns a reference to the values held by the instance. You should make sure that the instance really holds values before calling it! Do not free the BaseType*s contained in the vector of vectors.

Returns
A reference tp the vector of vector of BaseType*

Definition at line 281 of file D4Sequence.h.

◆ value_ref()

virtual D4SeqValues & libdap::D4Sequence::value_ref ( )
inlinevirtual

Get the sequence values by reference This method returns a reference to the D4Sequence's values, eliminating the copy of all the pointers. For large sequences, that could be a substantial number of values (even though they are 'just' pointers).

Returns
A reference to the vector of vector of BaseType*

Definition at line 291 of file D4Sequence.h.

◆ var() [1/2]

BaseType * libdap::Constructor::var ( const string &  n,
btp_stack &  s 
)
overridevirtualinherited

btp_stack no longer needed; use back pointers (BaseType::get_parent())

Deprecated:
Deprecated:
See comment in BaseType

Reimplemented from libdap::BaseType.

Definition at line 197 of file Constructor.cc.

◆ var() [2/2]

BaseType * libdap::Constructor::var ( const string &  name,
bool  exact_match = true,
btp_stack *  s = nullptr 
)
overridevirtualinherited

btp_stack no longer needed; use back pointers (BaseType::get_parent())

Reimplemented from libdap::BaseType.

Definition at line 185 of file Constructor.cc.

◆ var_begin()

Constructor::Vars_iter libdap::Constructor::var_begin ( )
inherited

Returns an iterator referencing the first structure element.

Definition at line 272 of file Constructor.cc.

◆ var_end()

Constructor::Vars_iter libdap::Constructor::var_end ( )
inherited

Returns an iterator referencing the end of the list of structure elements. Does not reference the last structure element.

Definition at line 280 of file Constructor.cc.

◆ var_rbegin()

Constructor::Vars_riter libdap::Constructor::var_rbegin ( )
inherited

Return a reverse iterator that references the last element.

Definition at line 287 of file Constructor.cc.

◆ var_rend()

Constructor::Vars_riter libdap::Constructor::var_rend ( )
inherited

Return a reverse iterator that references a point 'before' the first element.

Definition at line 295 of file Constructor.cc.

◆ var_value() [1/2]

BaseType * libdap::D4Sequence::var_value ( size_t  row_num,
const string &  name 
)
virtual

Get the BaseType pointer to the named variable of a given row.

Parameters
rowRead from row in the sequence.
nameReturn name from row.
Returns
A BaseType which holds the variable and its value.
See also
number_of_rows

Definition at line 398 of file D4Sequence.cc.

◆ var_value() [2/2]

BaseType * libdap::D4Sequence::var_value ( size_t  row_num,
size_t  i 
)
virtual

Get the BaseType pointer to the $i^{th}$ variable of row.

Parameters
rowRead from row in the sequence.
iReturn the $i^{th}$ variable from row.
Returns
A BaseType which holds the variable and its value.
See also
number_of_rows

Definition at line 415 of file D4Sequence.cc.

◆ variables()

const vector< BaseType * > & libdap::Constructor::variables ( ) const
inlineinherited

Get a const reference to the vector of BaseType pointers.

Note
Use this in range-based for loops to iterate over the variables.
Returns
A const reference to the vector of BaseType pointers.

Definition at line 113 of file Constructor.h.

◆ width()

unsigned int libdap::Constructor::width ( bool  constrained = false) const
overridevirtualinherited

This version of width simply returns the same thing as width() for simple types and Arrays. For Structure it returns the total size if constrained is false, or the size of the elements in the current projection if true.

Parameters
constrainedIf true, return the size after applying a constraint.
Returns
The number of bytes used by the variable.

Reimplemented from libdap::BaseType.

Definition at line 167 of file Constructor.cc.

Friends And Related Function Documentation

◆ D4SequenceTest

friend class D4SequenceTest
friend

Definition at line 168 of file D4Sequence.h.

Member Data Documentation

◆ d_length

int64_t libdap::D4Sequence::d_length
protected

Definition at line 154 of file D4Sequence.h.

◆ d_values

D4SeqValues libdap::D4Sequence::d_values
protected

Definition at line 152 of file D4Sequence.h.

◆ d_vars

std::vector<BaseType *> libdap::Constructor::d_vars
protectedinherited

Definition at line 49 of file Constructor.h.


The documentation for this class was generated from the following files: