net.sf.saxon.sort

Class IntHashMap

public class IntHashMap extends Object implements Serializable

A hash table that maps int keys to Object values.

Author: Dave Hale, Landmark Graphics Dominique Devienne Michael Kay: retrofitted to JDK 1.4, added iterator(), modified to disallow null values

Constructor Summary
IntHashMap()
Initializes a map with a capacity of 8 and a load factor of 0,25.
IntHashMap(int capacity)
Initializes a map with the given capacity and a load factor of 0,25.
IntHashMap(int capacity, double factor)
Constructs a new map with initial capacity, and load factor.
Method Summary
voidclear()
Clears the map.
IntHashMapcopy()
Create a copy of the IntHashMap
voiddisplay()
Diagnostic display of contents
Objectget(int key)
Gets the value for this key.
IntIteratorkeyIterator()
Get an iterator over the keys
voidput(int key, Object value)
Adds a key-value pair to the map.
booleanremove(int key)
Removes a key from the map.
intsize()
Gets the size of the map.
IteratorvalueIterator()
Get an iterator over the values

Constructor Detail

IntHashMap

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

IntHashMap

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

Parameters: capacity the initial capacity.

IntHashMap

public IntHashMap(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

clear

public void clear()
Clears the map.

copy

public IntHashMap copy()
Create a copy of the IntHashMap

display

public void display()
Diagnostic display of contents

get

public Object get(int key)
Gets the value for this key.

Parameters: key Key

Returns: the value, null if not found.

keyIterator

public IntIterator keyIterator()
Get an iterator over the keys

put

public void put(int key, Object value)
Adds a key-value pair to the map.

Parameters: key Key value Value

remove

public boolean remove(int key)
Removes a key from the map.

Parameters: key Key to remove

Returns: true if the value was removed

size

public int size()
Gets the size of the map.

Returns: the size (the number of entries in the map)

valueIterator

public Iterator valueIterator()
Get an iterator over the values