org.apache.xml.utils
Class ObjectVector

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

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

ObjectStack

public class ObjectVector

extends Object

implements Cloneable

A very simple table that stores a list of objects. 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.

Field Summary

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

Constructor Summary

ObjectVector()
Default constructor.

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

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

ObjectVector(ObjectVector v)
Copy constructor for ObjectVector

Method Summary

void	addElement(Object value) Append an object onto the vector.
void	addElements(int numberOfElements) Append several slots onto the vector, but do not set the values.
void	addElements(Object value, int numberOfElements) Append several Object values onto the vector.
Object	clone() Returns clone of current ObjectVector
boolean	contains(Object s) Tell if the table contains the given Object.
Object	elementAt(int i) Get the nth element.
int	indexOf(Object 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(Object 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(Object value, int at) Inserts the specified object in this vector at the specified index.
int	lastIndexOf(Object 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() Remove all elements objects from the list.
boolean	removeElement(Object s) Removes the first occurrence of the argument from this vector.
void	removeElementAt(int i) Deletes the component at the specified index.
void	setElementAt(Object 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.
void	setToSize(int size)
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 Object[] m_map

Array of objects

m_firstFree

protected int m_firstFree

Number of ints in array

m_mapSize

protected int m_mapSize

Size of array

Constructor Detail

ObjectVector

public ObjectVector()

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

ObjectVector

public ObjectVector(int blocksize)

Construct a IntVector, using the given block size.

Parameters:

blocksize - Size of block to allocate

ObjectVector

public ObjectVector(int blocksize,
                    int increaseSize)

Construct a IntVector, using the given block size.

Parameters:

blocksize - Size of block to allocate

ObjectVector

public ObjectVector(ObjectVector v)

Copy constructor for ObjectVector

Parameters:

v - Existing ObjectVector 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(Object value)

Append an object onto the vector.

Parameters:

value - Object to add to the list

addElements

public final void addElements(Object value,
                              int numberOfElements)

Append several Object values onto the vector.

Parameters:

value - Object to add to the list

addElements

public final void addElements(int numberOfElements)

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

Parameters:

numberOfElements - number of slots to append

insertElementAt

public final void insertElementAt(Object value,
                                  int at)

Inserts the specified object 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 - Object to insert

at - Index of where to insert

removeAllElements

public final void removeAllElements()

Remove all elements objects from the list.

removeElement

public final boolean removeElement(Object 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 - Object to remove from array

Returns:

True if the object 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 an object

setElementAt

public final void setElementAt(Object 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:

value - object to set

index - Index of where to set the object

elementAt

public final Object elementAt(int i)

Get the nth element.

Parameters:

i - index of object to get

Returns:

object at given index

contains

public final boolean contains(Object s)

Tell if the table contains the given Object.

Parameters:

s - object to look for

Returns:

true if the object is in the list

indexOf

public final int indexOf(Object 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(Object 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(Object 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.

setToSize

public final void setToSize(int size)

clone

public Object clone()
             throws CloneNotSupportedException

Returns clone of current ObjectVector

Overrides:

clone in class Object

Returns:

clone of current ObjectVector

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