org.apache.xml.utils

Class IntStack

Implemented Interfaces:
Cloneable

public class IntStack
extends IntVector

Implement a stack of simple integers. %OPT% This is currently based on IntVector, which permits fast acess but pays a heavy recopying penalty if/when its size is increased. If we expect deep stacks, we should consider a version based on ChunkedIntVector.

Constructor Summary

IntStack()
Default constructor.
IntStack(int blocksize)
Construct a IntVector, using the given block size.
IntStack(IntStack v)
Copy constructor for IntStack

Method Summary

Object
clone()
Returns clone of current IntStack
boolean
empty()
Tests if this stack is empty.
int
peek()
Looks at the object at the top of this stack without removing it from the stack.
int
peek(int n)
Looks at the object at the position the stack counting down n items.
int
pop()
Removes the object at the top of this stack and returns that object as the value of this function.
int
push(int i)
Pushes an item onto the top of this stack.
void
quickPop(int n)
Quickly pops a number of items from the stack.
int
search(int o)
Returns where an object is on this stack.
void
setTop(int val)
Sets an object at a the top of the statck

Methods inherited from class org.apache.xml.utils.IntVector

addElement, addElements, addElements, clone, contains, elementAt, indexOf, indexOf, insertElementAt, lastIndexOf, removeAllElements, removeElement, removeElementAt, setElementAt, setSize, size

Constructor Details

IntStack

public IntStack()
Default constructor. Note that the default block size is very small, for small lists.


IntStack

public IntStack(int blocksize)
Construct a IntVector, using the given block size.

Parameters:
blocksize - Size of block to allocate


IntStack

public IntStack(IntStack v)
Copy constructor for IntStack

Parameters:
v - IntStack to copy

Method Details

clone

public Object clone()
            throws CloneNotSupportedException
Returns clone of current IntStack
Overrides:
clone in interface IntVector

Returns:
clone of current IntStack


empty

public boolean empty()
Tests if this stack is empty.

Returns:
true if this stack is empty; false otherwise.

Since:
JDK1.0


peek

public final int peek()
Looks at the object at the top of this stack without removing it from the stack.

Returns:
the object at the top of this stack.


peek

public int peek(int n)
Looks at the object at the position the stack counting down n items.

Parameters:
n - The number of items down, indexed from zero.

Returns:
the object at n items down.


pop

public final int pop()
Removes the object at the top of this stack and returns that object as the value of this function.

Returns:
The object at the top of this stack.


push

public int push(int i)
Pushes an item onto the top of this stack.

Parameters:
i - the int to be pushed onto this stack.

Returns:
the item argument.


quickPop

public final void quickPop(int n)
Quickly pops a number of items from the stack.


search

public int search(int o)
Returns where an object is on this stack.

Parameters:
o - the desired object.

Returns:
the distance from the top of the stack where the object is] located; the return value -1 indicates that the object is not on the stack.

Since:
JDK1.0


setTop

public void setTop(int val)
Sets an object at a the top of the statck

Parameters:
val - object to set at the top


Copyright B) 2004 Apache XML Project. All Rights Reserved.