org.apache.xml.utils
Class IntVector

java.lang.Object
  org.apache.xml.utils.IntVector

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

IntStack

public class IntVector

extends Object

implements Cloneable

A very simple table that stores a list of int. This version is based on a "realloc" strategy -- a simle array is used, and when more storage is needed, a larger array is obtained and all existing data is recopied into it. As a result, read/write access to existing nodes is O(1) fast but appending may be O(N**2) slow. See also SuballocatedIntVector.

Field Summary

protected int	m_blocksize Size of blocks to allocate
protected int	m_firstFree Number of ints in array
protected int[]	m_map Array of ints
protected int	m_mapSize Size of array

Constructor Summary

IntVector()
Default constructor.

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

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

IntVector(IntVector v)
Copy constructor for IntVector

Method Summary

void	addElement(int value) Append a int onto the vector.
void	addElements(int numberOfElements) Append several slots onto the vector, but do not set the values.
void	addElements(int value, int numberOfElements) Append several int values onto the vector.
Object	clone() Returns clone of current IntVector
boolean	contains(int s) Tell if the table contains the given node.
int	elementAt(int i) Get the nth element.
int	indexOf(int elem) Searches for the first occurence of the given argument, beginning the search at index, and testing for equality using the equals method.
int	indexOf(int elem, int index) Searches for the first occurence of the given argument, beginning the search at index, and testing for equality using the equals method.
void	insertElementAt(int value, int at) Inserts the specified node in this vector at the specified index.
int	lastIndexOf(int elem) Searches for the first occurence of the given argument, beginning the search at index, and testing for equality using the equals method.
void	removeAllElements() Inserts the specified node in this vector at the specified index.
boolean	removeElement(int s) Removes the first occurrence of the argument from this vector.
void	removeElementAt(int i) Deletes the component at the specified index.
void	setElementAt(int value, int index) Sets the component at the specified index of this vector to be the specified object.
void	setSize(int sz) Get the length of the list.
int	size() Get the length of the list.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

m_blocksize

protected int m_blocksize

Size of blocks to allocate

m_map

protected int[] m_map

Array of ints

m_firstFree

protected int m_firstFree

Number of ints in array

m_mapSize

protected int m_mapSize

Size of array

Constructor Detail

IntVector

public IntVector()

Default constructor. Note that the default block size is very small, for small lists.

IntVector

public IntVector(int blocksize)

Construct a IntVector, using the given block size.

Parameters:

blocksize - Size of block to allocate

IntVector

public IntVector(int blocksize,
                 int increaseSize)

Construct a IntVector, using the given block size.

Parameters:

blocksize - Size of block to allocate

IntVector

public IntVector(IntVector v)

Copy constructor for IntVector

Parameters:

v - Existing IntVector to copy

Method Detail

size

public final int size()

Get the length of the list.

Returns:

length of the list

setSize

public final void setSize(int sz)

Get the length of the list.

Returns:

length of the list

addElement

public final void addElement(int value)

Append a int onto the vector.

Parameters:

value - Int to add to the list

addElements

public final void addElements(int value,
                              int numberOfElements)

Append several int values onto the vector.

Parameters:

value - Int to add to the list

addElements

public final void addElements(int numberOfElements)

Append several slots onto the vector, but do not set the values.

insertElementAt

public final void insertElementAt(int value,
                                  int at)

Inserts the specified node in this vector at the specified index. Each component in this vector with an index greater or equal to the specified index is shifted upward to have an index one greater than the value it had previously.

Parameters:

value - Int to insert

at - Index of where to insert

removeAllElements

public final void removeAllElements()

Inserts the specified node in this vector at the specified index. Each component in this vector with an index greater or equal to the specified index is shifted upward to have an index one greater than the value it had previously.

removeElement

public final boolean removeElement(int s)

Removes the first occurrence of the argument from this vector. If the object is found in this vector, each component in the vector with an index greater or equal to the object's index is shifted downward to have an index one smaller than the value it had previously.

Parameters:

s - Int to remove from array

Returns:

True if the int was removed, false if it was not found

removeElementAt

public final void removeElementAt(int i)

Deletes the component at the specified index. Each component in this vector with an index greater or equal to the specified index is shifted downward to have an index one smaller than the value it had previously.

Parameters:

i - index of where to remove and int

setElementAt

public final void setElementAt(int value,
                               int index)

Sets the component at the specified index of this vector to be the specified object. The previous component at that position is discarded. The index must be a value greater than or equal to 0 and less than the current size of the vector.

Parameters:

index - Index of where to set the object

elementAt

public final int elementAt(int i)

Get the nth element.

Parameters:

i - index of object to get

Returns:

object at given index

contains

public final boolean contains(int s)

Tell if the table contains the given node.

Parameters:

s - object to look for

Returns:

true if the object is in the list

indexOf

public final int indexOf(int elem,
                         int index)

Searches for the first occurence of the given argument, beginning the search at index, and testing for equality using the equals method.

Parameters:

elem - object to look for

index - Index of where to begin search

Returns:

the index of the first occurrence of the object argument in this vector at position index or later in the vector; returns -1 if the object is not found.

indexOf

public final int indexOf(int elem)

Searches for the first occurence of the given argument, beginning the search at index, and testing for equality using the equals method.

Parameters:

elem - object to look for

Returns:

the index of the first occurrence of the object argument in this vector at position index or later in the vector; returns -1 if the object is not found.

lastIndexOf

public final int lastIndexOf(int elem)

Searches for the first occurence of the given argument, beginning the search at index, and testing for equality using the equals method.

Parameters:

elem - Object to look for

Returns:

the index of the first occurrence of the object argument in this vector at position index or later in the vector; returns -1 if the object is not found.

clone

public Object clone()
             throws CloneNotSupportedException

Returns clone of current IntVector

Overrides:

clone in class Object

Returns:

clone of current IntVector

Throws:

CloneNotSupportedException - if the object's class does not support the Cloneable interface. Subclasses that override the clone method can also throw this exception to indicate that an instance cannot be cloned.

See Also:

Cloneable