Class CursorableLinkedList

java.lang.Object
org.apache.commons.collections.CursorableLinkedList
All Implemented Interfaces:
Serializable, Iterable, Collection, List

public class CursorableLinkedList extends Object implements List, Serializable
Deprecated.
Use new version in list subpackage, which has been rewritten and now returns the cursor from the listIterator method. Will be removed in v4.0
A doubly-linked list implementation of the List interface, supporting a ListIterator that allows concurrent modifications to the underlying list.

Implements all of the optional List operations, the stack/queue/dequeue operations available in LinkedList and supports a ListIterator that allows concurrent modifications to the underlying list (see cursor()).

Note that this implementation is not synchronized.

Since:
Commons Collections 1.0
Version:
$Revision: 647116 $ $Date: 2008-04-11 13:23:08 +0200 (Fri, 11 Apr 2008) $
Author:
Rodney Waldhoff, Janek Bogucki, Simon Kitching
See Also:
  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Class
    Description
    class 
    Deprecated.
     
  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected List
    Deprecated.
    A list of the currently CursorableLinkedList.Cursors currently open in this list.
    protected org.apache.commons.collections.CursorableLinkedList.Listable
    Deprecated.
    A sentry node.
    protected int
    Deprecated.
    Tracks the number of structural modifications to me.
    protected int
    Deprecated.
    The number of elements in me.
  • Constructor Summary

    Constructors
    Constructor
    Description
    Deprecated.
     
  • Method Summary

    Modifier and Type
    Method
    Description
    void
    add(int index, Object element)
    Deprecated.
    Inserts the specified element at the specified position in this list.
    boolean
    Deprecated.
    Appends the specified element to the end of this list.
    boolean
    addAll(int index, Collection c)
    Deprecated.
    Inserts all of the elements in the specified collection into this list at the specified position.
    boolean
    Deprecated.
    Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified Collection's Iterator.
    boolean
    Deprecated.
    Inserts the specified element at the beginning of this list.
    boolean
    Deprecated.
    Inserts the specified element at the end of this list.
    protected void
    broadcastListableChanged(org.apache.commons.collections.CursorableLinkedList.Listable elt)
    Deprecated.
    Informs all of my registered cursors that the specified element was changed.
    protected void
    broadcastListableInserted(org.apache.commons.collections.CursorableLinkedList.Listable elt)
    Deprecated.
    Informs all of my registered cursors that the specified element was just added to my list.
    protected void
    broadcastListableRemoved(org.apache.commons.collections.CursorableLinkedList.Listable elt)
    Deprecated.
    Informs all of my registered cursors that the specified element was just removed from my list.
    void
    Deprecated.
    Removes all of the elements from this list.
    boolean
    Deprecated.
    Returns true if this list contains the specified element.
    boolean
    Deprecated.
    Returns true if this list contains all of the elements of the specified collection.
    Deprecated.
    Returns a ListIterator for iterating through the elements of this list.
    cursor(int i)
    Deprecated.
    Returns a ListIterator for iterating through the elements of this list, initialized such that ListIterator.next() will return the element at the specified index (if any) and ListIterator.previous() will return the element immediately preceding it (if any).
    boolean
    Deprecated.
    Compares the specified object with this list for equality.
    get(int index)
    Deprecated.
    Returns the element at the specified position in this list.
    Deprecated.
    Returns the element at the beginning of this list.
    Deprecated.
    Returns the element at the end of this list.
    protected org.apache.commons.collections.CursorableLinkedList.Listable
    getListableAt(int index)
    Deprecated.
    Returns the CursorableLinkedList.Listable at the specified index.
    int
    Deprecated.
    Returns the hash code value for this list.
    int
    Deprecated.
    Returns the index in this list of the first occurrence of the specified element, or -1 if this list does not contain this element.
    protected org.apache.commons.collections.CursorableLinkedList.Listable
    insertListable(org.apache.commons.collections.CursorableLinkedList.Listable before, org.apache.commons.collections.CursorableLinkedList.Listable after, Object value)
    Deprecated.
    Inserts a new value into my list, after the specified before element, and before the specified after element
    protected void
    Deprecated.
    Informs all of my registered cursors that they are now invalid.
    boolean
    Deprecated.
    Returns true if this list contains no elements.
    Deprecated.
    Returns a fail-fast iterator.
    int
    Deprecated.
    Returns the index in this list of the last occurrence of the specified element, or -1 if this list does not contain this element.
    Deprecated.
    Returns a fail-fast ListIterator.
    listIterator(int index)
    Deprecated.
    Returns a fail-fast ListIterator.
    protected void
    Deprecated.
    Registers a CursorableLinkedList.Cursor to be notified of changes to this list.
    remove(int index)
    Deprecated.
    Removes the element at the specified position in this list (optional operation).
    boolean
    Deprecated.
    Removes the first occurrence in this list of the specified element.
    boolean
    Deprecated.
    Removes from this list all the elements that are contained in the specified collection.
    Deprecated.
    Removes the first element of this list, if any.
    Deprecated.
    Removes the last element of this list, if any.
    protected void
    removeListable(org.apache.commons.collections.CursorableLinkedList.Listable elt)
    Deprecated.
    Removes the given CursorableLinkedList.Listable from my list.
    boolean
    Deprecated.
    Retains only the elements in this list that are contained in the specified collection.
    set(int index, Object element)
    Deprecated.
    Replaces the element at the specified position in this list with the specified element.
    int
    Deprecated.
    Returns the number of elements in this list.
    subList(int i, int j)
    Deprecated.
    Returns a fail-fast sublist.
    Deprecated.
    Returns an array containing all of the elements in this list in proper sequence.
    Deprecated.
    Returns an array containing all of the elements in this list in proper sequence; the runtime type of the returned array is that of the specified array.
    Deprecated.
    Returns a String representation of this list, suitable for debugging.
    protected void
    Deprecated.
    Removes a CursorableLinkedList.Cursor from the set of cursors to be notified of changes to this list.

    Methods inherited from class java.lang.Object

    clone, finalize, getClass, notify, notifyAll, wait, wait, wait

    Methods inherited from interface java.util.Collection

    parallelStream, removeIf, stream, toArray

    Methods inherited from interface java.lang.Iterable

    forEach

    Methods inherited from interface java.util.List

    replaceAll, sort, spliterator
  • Field Details

    • _size

      protected transient int _size
      Deprecated.
      The number of elements in me.
    • _head

      protected transient org.apache.commons.collections.CursorableLinkedList.Listable _head
      Deprecated.
      A sentry node.

      _head.next() points to the first element in the list, _head.prev() to the last. Note that it is possible for _head.next().prev() and _head.prev().next() to be non-null, as when I am a sublist for some larger list. Use == _head.next() and == _head.prev() to determine if a given CursorableLinkedList.Listable is the first or last element in the list.

    • _modCount

      protected transient int _modCount
      Deprecated.
      Tracks the number of structural modifications to me.
    • _cursors

      protected transient List _cursors
      Deprecated.
      A list of the currently CursorableLinkedList.Cursors currently open in this list.
  • Constructor Details

    • CursorableLinkedList

      public CursorableLinkedList()
      Deprecated.
  • Method Details

    • add

      public boolean add(Object o)
      Deprecated.
      Appends the specified element to the end of this list.
      Specified by:
      add in interface Collection
      Specified by:
      add in interface List
      Parameters:
      o - element to be appended to this list.
      Returns:
      true
    • add

      public void add(int index, Object element)
      Deprecated.
      Inserts the specified element at the specified position in this list. Shifts the element currently at that position (if any) and any subsequent elements to the right (adds one to their indices).
      Specified by:
      add in interface List
      Parameters:
      index - index at which the specified element is to be inserted.
      element - element to be inserted.
      Throws:
      ClassCastException - if the class of the specified element prevents it from being added to this list.
      IllegalArgumentException - if some aspect of the specified element prevents it from being added to this list.
      IndexOutOfBoundsException - if the index is out of range (index < 0 || index > size()).
    • addAll

      public boolean addAll(Collection c)
      Deprecated.
      Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified Collection's Iterator. The behavior of this operation is unspecified if the specified collection is modified while the operation is in progress. (Note that this will occur if the specified collection is this list, and it's nonempty.)
      Specified by:
      addAll in interface Collection
      Specified by:
      addAll in interface List
      Parameters:
      c - collection whose elements are to be added to this list.
      Returns:
      true if this list changed as a result of the call.
      Throws:
      ClassCastException - if the class of an element in the specified collection prevents it from being added to this list.
      IllegalArgumentException - if some aspect of an element in the specified collection prevents it from being added to this list.
    • addAll

      public boolean addAll(int index, Collection c)
      Deprecated.
      Inserts all of the elements in the specified collection into this list at the specified position. Shifts the element currently at that position (if any) and any subsequent elements to the right (increases their indices). The new elements will appear in this list in the order that they are returned by the specified Collection's Iterator. The behavior of this operation is unspecified if the specified collection is modified while the operation is in progress. (Note that this will occur if the specified collection is this list, and it's nonempty.)
      Specified by:
      addAll in interface List
      Parameters:
      index - index at which to insert first element from the specified collection.
      c - elements to be inserted into this list.
      Returns:
      true if this list changed as a result of the call.
      Throws:
      ClassCastException - if the class of one of elements of the specified collection prevents it from being added to this list.
      IllegalArgumentException - if some aspect of one of elements of the specified collection prevents it from being added to this list.
      IndexOutOfBoundsException - if the index is out of range (index < 0 || index > size()).
    • addFirst

      public boolean addFirst(Object o)
      Deprecated.
      Inserts the specified element at the beginning of this list. (Equivalent to add(0,o)).
      Parameters:
      o - element to be prepended to this list.
      Returns:
      true
    • addLast

      public boolean addLast(Object o)
      Deprecated.
      Inserts the specified element at the end of this list. (Equivalent to add(java.lang.Object)).
      Parameters:
      o - element to be appended to this list.
      Returns:
      true
    • clear

      public void clear()
      Deprecated.
      Removes all of the elements from this list. This list will be empty after this call returns (unless it throws an exception).
      Specified by:
      clear in interface Collection
      Specified by:
      clear in interface List
    • contains

      public boolean contains(Object o)
      Deprecated.
      Returns true if this list contains the specified element. More formally, returns true if and only if this list contains at least one element e such that (o==null ? e==null : o.equals(e)).
      Specified by:
      contains in interface Collection
      Specified by:
      contains in interface List
      Parameters:
      o - element whose presence in this list is to be tested.
      Returns:
      true if this list contains the specified element.
    • containsAll

      public boolean containsAll(Collection c)
      Deprecated.
      Returns true if this list contains all of the elements of the specified collection.
      Specified by:
      containsAll in interface Collection
      Specified by:
      containsAll in interface List
      Parameters:
      c - collection to be checked for containment in this list.
      Returns:
      true if this list contains all of the elements of the specified collection.
    • cursor

      public CursorableLinkedList.Cursor cursor()
      Deprecated.
      Returns a ListIterator for iterating through the elements of this list. Unlike iterator(), a cursor is not bothered by concurrent modifications to the underlying list.

      Specifically, when elements are added to the list before or after the cursor, the cursor simply picks them up automatically. When the "current" (i.e., last returned by ListIterator.next() or ListIterator.previous()) element of the list is removed, the cursor automatically adjusts to the change (invalidating the last returned value--i.e., it cannot be removed).

      Note that the returned ListIterator does not support the ListIterator.nextIndex() and ListIterator.previousIndex() methods (they throw UnsupportedOperationException when invoked.

      Historical Note: In previous versions of this class, the object returned from this method was required to be explicitly closed. This is no longer necessary.

      See Also:
    • cursor

      public CursorableLinkedList.Cursor cursor(int i)
      Deprecated.
      Returns a ListIterator for iterating through the elements of this list, initialized such that ListIterator.next() will return the element at the specified index (if any) and ListIterator.previous() will return the element immediately preceding it (if any). Unlike iterator(), a cursor is not bothered by concurrent modifications to the underlying list.
      Throws:
      IndexOutOfBoundsException - if the index is out of range (index < 0 || index > size()).
      See Also:
    • equals

      public boolean equals(Object o)
      Deprecated.
      Compares the specified object with this list for equality. Returns true if and only if the specified object is also a list, both lists have the same size, and all corresponding pairs of elements in the two lists are equal. (Two elements e1 and e2 are equal if (e1==null ? e2==null : e1.equals(e2)).) In other words, two lists are defined to be equal if they contain the same elements in the same order. This definition ensures that the equals method works properly across different implementations of the List interface.
      Specified by:
      equals in interface Collection
      Specified by:
      equals in interface List
      Overrides:
      equals in class Object
      Parameters:
      o - the object to be compared for equality with this list.
      Returns:
      true if the specified object is equal to this list.
    • get

      public Object get(int index)
      Deprecated.
      Returns the element at the specified position in this list.
      Specified by:
      get in interface List
      Parameters:
      index - index of element to return.
      Returns:
      the element at the specified position in this list.
      Throws:
      IndexOutOfBoundsException - if the index is out of range (index < 0 || index >= size()).
    • getFirst

      public Object getFirst()
      Deprecated.
      Returns the element at the beginning of this list.
    • getLast

      public Object getLast()
      Deprecated.
      Returns the element at the end of this list.
    • hashCode

      public int hashCode()
      Deprecated.
      Returns the hash code value for this list. The hash code of a list is defined to be the result of the following calculation:
        hashCode = 1;
        Iterator i = list.iterator();
        while (i.hasNext()) {
            Object obj = i.next();
            hashCode = 31*hashCode + (obj==null ? 0 : obj.hashCode());
        }
       
      This ensures that list1.equals(list2) implies that list1.hashCode()==list2.hashCode() for any two lists, list1 and list2, as required by the general contract of Object.hashCode.
      Specified by:
      hashCode in interface Collection
      Specified by:
      hashCode in interface List
      Overrides:
      hashCode in class Object
      Returns:
      the hash code value for this list.
      See Also:
    • indexOf

      public int indexOf(Object o)
      Deprecated.
      Returns the index in this list of the first occurrence of the specified element, or -1 if this list does not contain this element. More formally, returns the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if there is no such index.
      Specified by:
      indexOf in interface List
      Parameters:
      o - element to search for.
      Returns:
      the index in this list of the first occurrence of the specified element, or -1 if this list does not contain this element.
    • isEmpty

      public boolean isEmpty()
      Deprecated.
      Returns true if this list contains no elements.
      Specified by:
      isEmpty in interface Collection
      Specified by:
      isEmpty in interface List
      Returns:
      true if this list contains no elements.
    • iterator

      public Iterator iterator()
      Deprecated.
      Returns a fail-fast iterator.
      Specified by:
      iterator in interface Collection
      Specified by:
      iterator in interface Iterable
      Specified by:
      iterator in interface List
      See Also:
    • lastIndexOf

      public int lastIndexOf(Object o)
      Deprecated.
      Returns the index in this list of the last occurrence of the specified element, or -1 if this list does not contain this element. More formally, returns the highest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if there is no such index.
      Specified by:
      lastIndexOf in interface List
      Parameters:
      o - element to search for.
      Returns:
      the index in this list of the last occurrence of the specified element, or -1 if this list does not contain this element.
    • listIterator

      public ListIterator listIterator()
      Deprecated.
      Returns a fail-fast ListIterator.
      Specified by:
      listIterator in interface List
      See Also:
    • listIterator

      public ListIterator listIterator(int index)
      Deprecated.
      Returns a fail-fast ListIterator.
      Specified by:
      listIterator in interface List
      See Also:
    • remove

      public boolean remove(Object o)
      Deprecated.
      Removes the first occurrence in this list of the specified element. If this list does not contain the element, it is unchanged. More formally, removes the element with the lowest index i such that (o==null ? get(i)==null : o.equals(get(i))) (if such an element exists).
      Specified by:
      remove in interface Collection
      Specified by:
      remove in interface List
      Parameters:
      o - element to be removed from this list, if present.
      Returns:
      true if this list contained the specified element.
    • remove

      public Object remove(int index)
      Deprecated.
      Removes the element at the specified position in this list (optional operation). Shifts any subsequent elements to the left (subtracts one from their indices). Returns the element that was removed from the list.
      Specified by:
      remove in interface List
      Parameters:
      index - the index of the element to removed.
      Returns:
      the element previously at the specified position.
      Throws:
      IndexOutOfBoundsException - if the index is out of range (index < 0 || index >= size()).
    • removeAll

      public boolean removeAll(Collection c)
      Deprecated.
      Removes from this list all the elements that are contained in the specified collection.
      Specified by:
      removeAll in interface Collection
      Specified by:
      removeAll in interface List
      Parameters:
      c - collection that defines which elements will be removed from this list.
      Returns:
      true if this list changed as a result of the call.
    • removeFirst

      public Object removeFirst()
      Deprecated.
      Removes the first element of this list, if any.
    • removeLast

      public Object removeLast()
      Deprecated.
      Removes the last element of this list, if any.
    • retainAll

      public boolean retainAll(Collection c)
      Deprecated.
      Retains only the elements in this list that are contained in the specified collection. In other words, removes from this list all the elements that are not contained in the specified collection.
      Specified by:
      retainAll in interface Collection
      Specified by:
      retainAll in interface List
      Parameters:
      c - collection that defines which elements this set will retain.
      Returns:
      true if this list changed as a result of the call.
    • set

      public Object set(int index, Object element)
      Deprecated.
      Replaces the element at the specified position in this list with the specified element.
      Specified by:
      set in interface List
      Parameters:
      index - index of element to replace.
      element - element to be stored at the specified position.
      Returns:
      the element previously at the specified position.
      Throws:
      ClassCastException - if the class of the specified element prevents it from being added to this list.
      IllegalArgumentException - if some aspect of the specified element prevents it from being added to this list.
      IndexOutOfBoundsException - if the index is out of range (index < 0 || index >= size()).
    • size

      public int size()
      Deprecated.
      Returns the number of elements in this list.
      Specified by:
      size in interface Collection
      Specified by:
      size in interface List
      Returns:
      the number of elements in this list.
    • toArray

      public Object[] toArray()
      Deprecated.
      Returns an array containing all of the elements in this list in proper sequence. Obeys the general contract of the Collection.toArray() method.
      Specified by:
      toArray in interface Collection
      Specified by:
      toArray in interface List
      Returns:
      an array containing all of the elements in this list in proper sequence.
    • toArray

      public Object[] toArray(Object[] a)
      Deprecated.
      Returns an array containing all of the elements in this list in proper sequence; the runtime type of the returned array is that of the specified array. Obeys the general contract of the Collection.toArray() method.
      Specified by:
      toArray in interface Collection
      Specified by:
      toArray in interface List
      Parameters:
      a - the array into which the elements of this list are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.
      Returns:
      an array containing the elements of this list.
      Throws:
      ArrayStoreException - if the runtime type of the specified array is not a supertype of the runtime type of every element in this list.
    • toString

      public String toString()
      Deprecated.
      Returns a String representation of this list, suitable for debugging.
      Overrides:
      toString in class Object
      Returns:
      a String representation of this list, suitable for debugging.
    • subList

      public List subList(int i, int j)
      Deprecated.
      Returns a fail-fast sublist.
      Specified by:
      subList in interface List
      See Also:
    • insertListable

      protected org.apache.commons.collections.CursorableLinkedList.Listable insertListable(org.apache.commons.collections.CursorableLinkedList.Listable before, org.apache.commons.collections.CursorableLinkedList.Listable after, Object value)
      Deprecated.
      Inserts a new value into my list, after the specified before element, and before the specified after element
      Returns:
      the newly created CursorableLinkedList.Listable
    • removeListable

      protected void removeListable(org.apache.commons.collections.CursorableLinkedList.Listable elt)
      Deprecated.
      Removes the given CursorableLinkedList.Listable from my list.
    • getListableAt

      protected org.apache.commons.collections.CursorableLinkedList.Listable getListableAt(int index)
      Deprecated.
      Returns the CursorableLinkedList.Listable at the specified index.
      Throws:
      IndexOutOfBoundsException - if index is less than zero or greater than or equal to the size of this list.
    • registerCursor

      protected void registerCursor(CursorableLinkedList.Cursor cur)
      Deprecated.
      Registers a CursorableLinkedList.Cursor to be notified of changes to this list.
    • unregisterCursor

      protected void unregisterCursor(CursorableLinkedList.Cursor cur)
      Deprecated.
      Removes a CursorableLinkedList.Cursor from the set of cursors to be notified of changes to this list.
    • invalidateCursors

      protected void invalidateCursors()
      Deprecated.
      Informs all of my registered cursors that they are now invalid.
    • broadcastListableChanged

      protected void broadcastListableChanged(org.apache.commons.collections.CursorableLinkedList.Listable elt)
      Deprecated.
      Informs all of my registered cursors that the specified element was changed.
      See Also:
    • broadcastListableRemoved

      protected void broadcastListableRemoved(org.apache.commons.collections.CursorableLinkedList.Listable elt)
      Deprecated.
      Informs all of my registered cursors that the specified element was just removed from my list.
    • broadcastListableInserted

      protected void broadcastListableInserted(org.apache.commons.collections.CursorableLinkedList.Listable elt)
      Deprecated.
      Informs all of my registered cursors that the specified element was just added to my list.