org.pcollections

Class IntTreePMap<V>

java.lang.Object

java.util.AbstractMap<Integer,V>

org.pcollections.IntTreePMap<V>

Type Parameters:

V -

All Implemented Interfaces:

Map<Integer,V>, PMap<Integer,V>

public final class IntTreePMap<V>
extends AbstractMap<Integer,V>
implements PMap<Integer,V>

An efficient persistent map from integer keys to non-null values.

Iteration occurs in the integer order of the keys.

This implementation is thread-safe (assuming Java's AbstractMap and AbstractSet are thread-safe), although its iterators may not be.

The balanced tree is based on the Glasgow Haskell Compiler's Data.Map implementation, which in turn is based on "size balanced binary trees" as described by:

Stephen Adams, "Efficient sets: a balancing act", Journal of Functional Programming 3(4):553-562, October 1993, http://www.swiss.ai.mit.edu/~adams/BB/.

J. Nievergelt and E.M. Reingold, "Binary search trees of bounded balance", SIAM journal of computing 2(1), March 1973.

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Method Summary

Methods

Modifier and Type	Method and Description
boolean	containsKey(Object key)
static <V> IntTreePMap<V>	empty()
Set<Map.Entry<Integer,V>>	entrySet()
static <V> IntTreePMap<V>	from(Map<? extends Integer,? extends V> map)
V	get(Object key)
IntTreePMap<V>	minus(Object key)
IntTreePMap<V>	minusAll(Collection<?> keys)
IntTreePMap<V>	plus(Integer key, V value)
IntTreePMap<V>	plusAll(Map<? extends Integer,? extends V> map)
static <V> IntTreePMap<V>	singleton(Integer key, V value)
int	size()

Methods inherited from class java.util.AbstractMap

clear, clone, containsValue, equals, hashCode, isEmpty, keySet, put, putAll, remove, toString, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.pcollections.PMap

clear, put, putAll, remove

Methods inherited from interface java.util.Map

containsValue, equals, hashCode, isEmpty, keySet, values

Method Detail

empty

public static <V> IntTreePMap<V> empty()

Type Parameters:

V -

Returns:

an empty map

singleton

public static <V> IntTreePMap<V> singleton(Integer key,
                           V value)

Type Parameters:

V -

Parameters:

key -

value -

Returns:

empty().plus(key, value)

from

public static <V> IntTreePMap<V> from(Map<? extends Integer,? extends V> map)

Type Parameters:

V -

Parameters:

map -

Returns:

empty().plusAll(map)

entrySet

public Set<Map.Entry<Integer,V>> entrySet()

Specified by:

entrySet in interface Map<Integer,V>

Specified by:

entrySet in class AbstractMap<Integer,V>

size

public int size()

Specified by:

size in interface Map<Integer,V>

Overrides:

size in class AbstractMap<Integer,V>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<Integer,V>

Overrides:

containsKey in class AbstractMap<Integer,V>

get

public V get(Object key)

Specified by:

get in interface Map<Integer,V>

Overrides:

get in class AbstractMap<Integer,V>

plus

public IntTreePMap<V> plus(Integer key,
                  V value)

Specified by:

plus in interface PMap<Integer,V>

Parameters:

key - non-null

value - non-null

Returns:

a map with the mappings of this but with key mapped to value

minus

public IntTreePMap<V> minus(Object key)

Specified by:

minus in interface PMap<Integer,V>

Returns:

a map with the mappings of this but with no value for key

plusAll

public IntTreePMap<V> plusAll(Map<? extends Integer,? extends V> map)

Specified by:

plusAll in interface PMap<Integer,V>

Returns:

this combined with map, with map's mappings used for any keys in both map and this

minusAll

public IntTreePMap<V> minusAll(Collection<?> keys)

Specified by:

minusAll in interface PMap<Integer,V>

Returns:

a map with the mappings of this but with no value for any element of keys