Class StyleContext.SmallAttributeSet

public SmallAttributeSet(Object[] a)

public SmallAttributeSet(AttributeSet a)

public Object clone()

This method may be called to create a new copy of the Object. The typical behavior is as follows:

• o == o.clone() is false
• o.getClass() == o.clone().getClass() is true
• o.equals(o) is true

However, these are not strict requirements, and may be violated if necessary. Of the three requirements, the last is the most commonly violated, particularly if the subclass does not override Object.equals(Object).

If the Object you call clone() on does not implement Cloneable (which is a placeholder interface), then a CloneNotSupportedException is thrown. Notice that Object does not implement Cloneable; this method exists as a convenience for subclasses that do.

Object's implementation of clone allocates space for the new Object using the correct class, without calling any constructors, and then fills in all of the new field values with the old field values. Thus, it is a shallow copy. However, subclasses are permitted to make a deep copy.

All array types implement Cloneable, and override this method as follows (it should never fail):

 public Object clone()
 {
   try
     {
       super.clone();
     }
   catch (CloneNotSupportedException e)
     {
       throw new InternalError(e.getMessage());
     }
 }
 

Overrides:

clone in interface Object

Returns:

a copy of the Object

See Also:

Cloneable

public boolean containsAttribute(Object name,
                                 Object value)

Returns true if this AttributeSet contains an attribute with the specified name and value, false otherwise.

Specified by:

containsAttribute in interface AttributeSet

Parameters:

name - the name of the requested attribute

value - the value of the requested attribute

Returns:

true if this AttributeSet contains an attribute with the specified name and value, false otherwise

public boolean containsAttributes(AttributeSet a)

Returns true of this AttributeSet contains all of the specified attributes.

Specified by:

containsAttributes in interface AttributeSet

Parameters:

Returns:

true of this AttributeSet contains all of the specified attributes

public AttributeSet copyAttributes()

Creates and returns a copy of this AttributeSet.

Specified by:

copyAttributes in interface AttributeSet

Returns:

a copy of this AttributeSet

public boolean equals(Object obj)

Determine whether this Object is semantically equal to another Object.

There are some fairly strict requirements on this method which subclasses must follow:

• It must be transitive. If a.equals(b) and b.equals(c), then a.equals(c) must be true as well.
• It must be symmetric. a.equals(b) and b.equals(a) must have the same value.
• It must be reflexive. a.equals(a) must always be true.
• It must be consistent. Whichever value a.equals(b) returns on the first invocation must be the value returned on all later invocations.
• a.equals(null) must be false.
• It must be consistent with hashCode(). That is, a.equals(b) must imply a.hashCode() == b.hashCode(). The reverse is not true; two objects that are not equal may have the same hashcode, but that has the potential to harm hashing performance.

This is typically overridden to throw a ClassCastException if the argument is not comparable to the class performing the comparison, but that is not a requirement. It is legal for a.equals(b) to be true even though a.getClass() != b.getClass(). Also, it is typical to never cause a NullPointerException.

In general, the Collections API (java.util) use the equals method rather than the == operator to compare objects. However, IdentityHashMap is an exception to this rule, for its own good reasons.

The default implementation returns this == o.

Overrides:

equals in interface Object

Parameters:

obj - the Object to compare to

Returns:

whether this Object is semantically equal to another

See Also:

Object.hashCode()

public Object getAttribute(Object key)

Returns the attribute with the specified key or null if no such attribute is defined in this AttributeSet and its resolving parents.

Specified by:

getAttribute in interface AttributeSet

Parameters:

key - the key of the attribute that is looked up

Returns:

the attribute with the specified key or null if no such attribute is defined in this AttributeSet and its resolving parents

public int getAttributeCount()

Returns the number of attributes that are stored locally in this AttributeSet.

Specified by:

getAttributeCount in interface AttributeSet

Returns:

the number of attributes that are stored locally in this AttributeSet

public Enumeration getAttributeNames()

Returns the names of the attributes that are stored in this AttributeSet.

Specified by:

getAttributeNames in interface AttributeSet

Returns:

the names of the attributes that are stored in this AttributeSet

public AttributeSet getResolveParent()

Returns the resolving parent of this AttributeSet. If a key is not stored locally, then a AttributeSet.getAttribute(Object) request is resolved up in the resolving parent of this AttributeSet.

Specified by:

getResolveParent in interface AttributeSet

Returns:

the resolving parent of this AttributeSet

public int hashCode()

Get a value that represents this Object, as uniquely as possible within the confines of an int.

There are some requirements on this method which subclasses must follow:

• Semantic equality implies identical hashcodes. In other words, if a.equals(b) is true, then a.hashCode() == b.hashCode() must be as well. However, the reverse is not necessarily true, and two objects may have the same hashcode without being equal.
• It must be consistent. Whichever value o.hashCode() returns on the first invocation must be the value returned on all later invocations as long as the object exists. Notice, however, that the result of hashCode may change between separate executions of a Virtual Machine, because it is not invoked on the same object.

Notice that since hashCode is used in Hashtable and other hashing classes, a poor implementation will degrade the performance of hashing (so don't blindly implement it as returning a constant!). Also, if calculating the hash is time-consuming, a class may consider caching the results.

The default implementation returns System.identityHashCode(this)

Overrides:

hashCode in interface Object

Returns:

the hash code for this Object

See Also:

Object.equals(Object), System.identityHashCode(Object)

public boolean isDefined(Object key)

Returns true if an attribute with the specified name is defined locally in this AttributeSet, without resolving through the resolving parents.

Specified by:

isDefined in interface AttributeSet

Returns:

true if an attribute with the specified name is defined locally in this AttributeSet

public boolean isEqual(AttributeSet attr)

Returns true if all of the attributes in attr are equal to the attributes in this AttributeSet, false otherwise.

Specified by:

isEqual in interface AttributeSet

Parameters:

attr - the attributes to be compared to this

Returns:

true if all of the attributes in attr are equal to the attributes in this AttributeSet, false otherwise

public String toString()

Convert this Object to a human-readable String. There are no limits placed on how long this String should be or what it should contain. We suggest you make it as intuitive as possible to be able to place it into System.out.println() and such.

It is typical, but not required, to ensure that this method never completes abruptly with a RuntimeException.

This method will be called when performing string concatenation with this object. If the result is null, string concatenation will instead use "null".

The default implementation returns getClass().getName() + "@" + Integer.toHexString(hashCode()).

Overrides:

toString in interface Object

Returns:

the String representing this Object, which may be null

See Also:

getClass(), Object.hashCode(), Class.getName(), Integer.toHexString(int)