## org.apache.tools.ant.util
Class IdentityStack

    java.lang.Object
      java.util.AbstractCollection<E>
          java.util.AbstractList<E>
              java.util.Vector<E>
                  java.util.Stack
                      org.apache.tools.ant.util.IdentityStack

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable, java.lang.Iterable, java.util.Collection, java.util.List, java.util.RandomAccess

    public class IdentityStack

extends java.util.Stack

Identity Stack.

Since:
  Ant 1.7
See Also:
  Serialized Form

Field Summary

Fields inherited from class java.util.Vector
`capacityIncrement, elementCount, elementData`

Fields inherited from class java.util.AbstractList
`modCount`

Constructor Summary
`IdentityStack()` Default constructor.
`IdentityStack(java.lang.Object o)` Construct a new IdentityStack with the specified Object as the bottom element.

Method Summary
`boolean` `contains(java.lang.Object o)` Override methods that use `.equals()` comparisons on elements.
`static IdentityStack` `getInstance(java.util.Stack s)` Get an IdentityStack containing the contents of the specified Stack.
`int` `indexOf(java.lang.Object o, int pos)` Override methods that use `.equals()` comparisons on elements.
`int` `lastIndexOf(java.lang.Object o, int pos)` Override methods that use `.equals()` comparisons on elements.

Methods inherited from class java.util.Stack
`empty, peek, pop, push, search`

Methods inherited from class java.util.Vector

`add, add, addAll, addAll, addElement, capacity, clear, clone, containsAll, copyInto, elementAt, elements, ensureCapacity, equals, firstElement, get, hashCode, indexOf, insertElementAt, isEmpty, lastElement, lastIndexOf, remove, remove, removeAll, removeAllElements, removeElement, removeElementAt, removeRange, retainAll, set, setElementAt, setSize, size, subList, toArray, toArray, toString, trimToSize`

Methods inherited from class java.util.AbstractList
`iterator, listIterator, listIterator`

Methods inherited from class java.lang.Object
`finalize, getClass, notify, notifyAll, wait, wait, wait`

Methods inherited from interface java.util.List
`iterator, listIterator, listIterator`

Constructor Detail

### IdentityStack

    public IdentityStack()

  Default constructor.

### IdentityStack

    public IdentityStack(java.lang.Object o)

  Construct a new IdentityStack with the specified Object as the bottom element.

  Parameters:
    `o` - the bottom element.

Method Detail

### getInstance

    public static IdentityStack getInstance(java.util.Stack s)

  Get an IdentityStack containing the contents of the specified Stack.

  Parameters:
    `s` - the Stack to copy; ignored if null.
  Returns:
    an IdentityStack instance.

### contains

    public boolean contains(java.lang.Object o)

  Override methods that use `.equals()` comparisons on elements.

  Specified by:
    `contains` in interface `java.util.Collection`
  Specified by:
    `contains` in interface `java.util.List`
  Overrides:
    `contains` in class `java.util.Vector`
  Parameters:
    `o` - the Object to search for.
  Returns:
    true if the stack contains the object.
  See Also:
    `Vector.contains(Object)`

### indexOf

    public int indexOf(java.lang.Object o,
                       int pos)

  Override methods that use `.equals()` comparisons on elements.

  Overrides:
    `indexOf` in class `java.util.Vector`
  Parameters:
    `o` - the Object to search for.
    `pos` - the position from which to search.
  Returns:
    the position of the object, -1 if not found.
  See Also:
    `Vector.indexOf(Object, int)`

### lastIndexOf

    public int lastIndexOf(java.lang.Object o,
                           int pos)

  Override methods that use `.equals()` comparisons on elements.

  Overrides:
    `lastIndexOf` in class `java.util.Vector`
  Parameters:
    `o` - the Object to search for.
    `pos` - the position from which to search (backward).
  Returns:
    the position of the object, -1 if not found.
  See Also:
    `Vector.indexOf(Object, int)`