Class FastStack
- java.lang.Object
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- org.pentaho.reporting.libraries.base.util.FastStack
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Cloneable
public final class FastStack extends java.lang.Object implements java.io.Serializable, java.lang.Cloneable
A very simple unsynchronized stack. This one is faster than the java.util-Version, which is based on the synchronized java.util.Vector class.- Author:
- Thomas Morgner
- See Also:
- Serialized Form
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
clear()
Removes all contents from the stack.java.lang.Object
clone()
Creates a shallow copy of the stack.java.lang.Object
get(int index)
Returns the element from the stack at the given index-position.boolean
isEmpty()
Checks whether the stack is empty.java.lang.Object
peek()
Loads the top-most element from the stack, without removing it from the stack.java.lang.Object
pop()
Loads the top-most element from the stack and removes it from the stack at the same time.void
push(java.lang.Object o)
Pushes a new object on the stack.int
size()
Returns the number of elements in the stack.
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Method Detail
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isEmpty
public boolean isEmpty()
Checks whether the stack is empty.- Returns:
- true, if the stack is empty, false otherwise.
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size
public int size()
Returns the number of elements in the stack.- Returns:
- the stack size.
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push
public void push(java.lang.Object o)
Pushes a new object on the stack. Null-references are allowed.- Parameters:
o
- the object, maybe null.
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peek
public java.lang.Object peek()
Loads the top-most element from the stack, without removing it from the stack.- Returns:
- the top-most object.
- Throws:
java.util.EmptyStackException
- if the stack is empty.
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pop
public java.lang.Object pop()
Loads the top-most element from the stack and removes it from the stack at the same time.- Returns:
- the top-most object.
- Throws:
java.util.EmptyStackException
- if the stack is empty.
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clone
public java.lang.Object clone()
Creates a shallow copy of the stack.- Returns:
- the cloned stack.
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clear
public void clear()
Removes all contents from the stack.
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get
public java.lang.Object get(int index)
Returns the element from the stack at the given index-position.- Parameters:
index
- the element's index.- Returns:
- the object.
- Throws:
java.lang.IndexOutOfBoundsException
- if the index given is greater than the number of objects in the stack.
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