net.sf.saxon.expr.sort
Class IntToIntHashMap

java.lang.Object
  net.sf.saxon.expr.sort.IntToIntHashMap

All Implemented Interfaces:

Serializable, IntToIntMap

public class IntToIntHashMap
extends Object
implements Serializable, IntToIntMap

A hash table that maps int keys to int values.

Author:

Dave Hale, Landmark Graphics, Dominique Devienne, Michael Kay: created this class based on IntHashMap

See Also:

Serialized Form

Constructor Summary

IntToIntHashMap()
Initializes a map with a capacity of 8 and a load factor of 0,25.

IntToIntHashMap(int capacity)
Initializes a map with the given capacity and a load factor of 0,25.

IntToIntHashMap(int capacity, double factor)
Constructs a new map with initial capacity, and load factor.

Method Summary

void	clear() Clears the map.
boolean	find(int key) Finds a key in the map.
int	get(int key) Gets the value for this key.
int	getDefaultValue() Get the default value used to indicate an unused entry
IntIterator	keyIterator() Get an iterator over the integer key values held in the hash map
void	put(int key, int value) Adds a key-value pair to the map.
boolean	remove(int key) Removes a key from the map.
void	setDefaultValue(int defaultValue) Set the value to be returned to indicate an unused entry
int	size() Gets the size of the map.

Methods inherited from class java.lang.Object

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

Constructor Detail

IntToIntHashMap

public IntToIntHashMap()

Initializes a map with a capacity of 8 and a load factor of 0,25.

IntToIntHashMap

public IntToIntHashMap(int capacity)

Initializes a map with the given capacity and a load factor of 0,25.

Parameters:

capacity - the initial capacity.

IntToIntHashMap

public IntToIntHashMap(int capacity,
                       double factor)

Constructs a new map with initial capacity, and load factor.

The capacity is the number of keys that can be mapped without resizing the arrays in which keys and values are stored. For efficiency, only a fraction of the elements in those arrays are used. That fraction is the specified load factor. The initial length of the arrays equals the smallest power of two not less than the ratio capacity/factor. The capacity of the map is increased, as necessary. The maximum number of keys that can be mapped is 2^30.

Parameters:

capacity - the initial capacity.

factor - the load factor.

Method Detail

setDefaultValue

public void setDefaultValue(int defaultValue)

Set the value to be returned to indicate an unused entry

Specified by:

setDefaultValue in interface IntToIntMap

Parameters:

defaultValue - the value to be returned by get(int) if no entry exists for the supplied key

getDefaultValue

public int getDefaultValue()

Get the default value used to indicate an unused entry

Specified by:

getDefaultValue in interface IntToIntMap

Returns:

the value to be returned by get(int) if no entry exists for the supplied key

clear

public void clear()

Clears the map.

Specified by:

clear in interface IntToIntMap

find

public boolean find(int key)

Finds a key in the map.

Specified by:

find in interface IntToIntMap

Parameters:

key - Key

Returns:

true if the key is mapped

get

public int get(int key)

Gets the value for this key.

Specified by:

get in interface IntToIntMap

Parameters:

key - Key

Returns:

the value, or the default value if not found.

size

public int size()

Gets the size of the map.

Specified by:

size in interface IntToIntMap

Returns:

the size

remove

public boolean remove(int key)

Removes a key from the map.

Specified by:

remove in interface IntToIntMap

Parameters:

key - Key to remove

Returns:

true if the value was removed

put

public void put(int key,
                int value)

Adds a key-value pair to the map.

Specified by:

put in interface IntToIntMap

Parameters:

key - Key

value - Value

keyIterator

public IntIterator keyIterator()

Get an iterator over the integer key values held in the hash map

Specified by:

keyIterator in interface IntToIntMap

Returns:

an iterator whose next() call returns the key values (in arbitrary order)