Package org.apache.xml.utils
Class IntStack
java.lang.Object
org.apache.xml.utils.IntVector
org.apache.xml.utils.IntStack
- All Implemented Interfaces:
Cloneable
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.
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionclone()
Returns clone of current IntStackboolean
empty()
Tests if this stack is empty.final 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.final 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.final 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 statckMethods inherited from class org.apache.xml.utils.IntVector
addElement, addElements, addElements, contains, elementAt, indexOf, indexOf, insertElementAt, lastIndexOf, removeAllElements, removeElement, removeElementAt, setElementAt, setSize, size
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Constructor Details
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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
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IntStack
Copy constructor for IntStack- Parameters:
v
- IntStack to copy
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Method Details
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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.
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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.
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quickPop
public final void quickPop(int n) Quickly pops a number of items from the stack. -
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.
- Throws:
EmptyStackException
- if this stack is empty.
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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.
- Throws:
EmptyStackException
- if this stack is empty.
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setTop
public void setTop(int val) Sets an object at a the top of the statck- Parameters:
val
- object to set at the top- Throws:
EmptyStackException
- if this stack is empty.
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empty
public boolean empty()Tests if this stack is empty.- Returns:
true
if this stack is empty;false
otherwise.- Since:
- JDK1.0
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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
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clone
Returns clone of current IntStack- Overrides:
clone
in classIntVector
- Returns:
- clone of current IntStack
- Throws:
CloneNotSupportedException
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