com.ibm.bluej.util.common

Class HashMapUtil

java.lang.Object

com.ibm.bluej.util.common.HashMapUtil

public class HashMapUtil
extends java.lang.Object

HashMap Utilities

Author:

partha

Constructor Summary

Constructors

Constructor and Description
HashMapUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static <K1,K2,V> void	addAL(java.util.Map<K1,java.util.HashMap<K2,java.util.ArrayList<V>>> map, K1 key1, K2 key2, V value) Adds an entry to an ArrayList which is an entry in a HashMap with a key of type K2, which is a value in a Map with a key of type K1
static <K,V> void	addAL(java.util.Map<K,java.util.ArrayList<V>> map, K key, V value) Adds an entry to an ArrayList which is an entry in a Map with a key of type K
static <K,V> void	addAL(java.util.Map<K,java.util.ArrayList<V>> map, java.util.Map<K,V> toAdd)
static <K1,K2,V,M extends java.util.Map<K2,V>> void	addAL2(java.util.Map<K1,java.util.HashMap<K2,java.util.ArrayList<V>>> map, java.util.Map<K1,M> toAdd)
static <K1,K2,V> boolean	addHS(java.util.Map<K1,java.util.HashMap<K2,java.util.HashSet<V>>> map, K1 key1, K2 key2, V value) adds a Key-Value pair to a HashMap of HashSets
static <K,V> boolean	addHS(java.util.Map<K,java.util.HashSet<V>> map, K key, V value) adds a Key-Value pair to a HashMap of HashSets
static <K,V> java.util.HashMap<K,V>	fromPairs(java.lang.Iterable<Pair<K,V>> pairs)
static <K,V> java.util.HashMap<K,V>	fromPairs(Pair<K,V>[] pairs)
static <K> int	getIndex(java.util.Map<K,java.lang.Integer> k2ndx, K key)
static <K1,K2,V> V	put2(java.util.Map<K1,java.util.HashMap<K2,V>> map, K1 key1, K2 key2, V value) Puts a value to a HashMap against an key of type K2, which itself a value of a HashMap with the key of type K1
static <K> void	removeAll(java.util.Map<K,?> map, java.util.Collection<K> set)
static <K> void	retainAll(java.util.Map<K,?> map, java.util.Collection<K> set)
static <K,V> java.util.HashMap<V,K>	reverse(java.util.Map<K,V> in) Reverses keys and values of a HashMap
static <K,V> java.util.HashMap<V,java.util.ArrayList<K>>	reverseAL(java.util.Map<K,java.util.ArrayList<V>> in) Reverses keys and values of HashMap that has ArrayList as value
static <K1,K2,V,M extends java.util.Map<K2,V>> java.util.HashMap<K2,java.util.HashMap<K1,V>>	reverseDouble(java.util.Map<K1,M> dblMap)
static <K,V> java.util.HashMap<V,java.util.ArrayList<K>>	reverseDuplicateValues(java.util.Map<K,V> in)
static <K,V> java.util.HashMap<V,java.util.HashSet<K>>	reverseHS(java.util.Map<K,java.util.HashSet<V>> in) Reverses keys and values of HashMap that has HashSet as values
static <K,V> java.util.ArrayList<Pair<K,V>>	toPairs(java.util.Map<K,V> map)
static <K,V> java.lang.String	toString(java.util.Map<K,V> map)

Methods inherited from class java.lang.Object

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

Constructor Detail

HashMapUtil

public HashMapUtil()

Method Detail

addHS

public static <K,V> boolean addHS(java.util.Map<K,java.util.HashSet<V>> map,
                  K key,
                  V value)

adds a Key-Value pair to a HashMap of HashSets

Parameters:

map -

key -

value -

Returns:

addHS

public static <K1,K2,V> boolean addHS(java.util.Map<K1,java.util.HashMap<K2,java.util.HashSet<V>>> map,
                      K1 key1,
                      K2 key2,
                      V value)

adds a Key-Value pair to a HashMap of HashSets

Parameters:

map -

key -

value -

Returns:

addAL

public static <K1,K2,V> void addAL(java.util.Map<K1,java.util.HashMap<K2,java.util.ArrayList<V>>> map,
                   K1 key1,
                   K2 key2,
                   V value)

Adds an entry to an ArrayList which is an entry in a HashMap with a key of type K2, which is a value in a Map with a key of type K1

Parameters:

map -

key1 -

key2 -

value -

addAL

public static <K,V> void addAL(java.util.Map<K,java.util.ArrayList<V>> map,
               K key,
               V value)

Adds an entry to an ArrayList which is an entry in a Map with a key of type K

Parameters:

map -

key -

value -

addAL

public static <K,V> void addAL(java.util.Map<K,java.util.ArrayList<V>> map,
               java.util.Map<K,V> toAdd)

addAL2

public static <K1,K2,V,M extends java.util.Map<K2,V>> void addAL2(java.util.Map<K1,java.util.HashMap<K2,java.util.ArrayList<V>>> map,
                                                  java.util.Map<K1,M> toAdd)

put2

public static <K1,K2,V> V put2(java.util.Map<K1,java.util.HashMap<K2,V>> map,
               K1 key1,
               K2 key2,
               V value)

Puts a value to a HashMap against an key of type K2, which itself a value of a HashMap with the key of type K1

Parameters:

map -

key1 -

key2 -

value -

reverseHS

public static <K,V> java.util.HashMap<V,java.util.HashSet<K>> reverseHS(java.util.Map<K,java.util.HashSet<V>> in)

Reverses keys and values of HashMap that has HashSet as values

Parameters:

in - - a HashMap of HashSet

Returns:

out - a HashMap of HashSet with key-values reversed

reverseAL

public static <K,V> java.util.HashMap<V,java.util.ArrayList<K>> reverseAL(java.util.Map<K,java.util.ArrayList<V>> in)

Reverses keys and values of HashMap that has ArrayList as value

Parameters:

in - - a HashMap of ArrayList

Returns:

out - a HashMap of ArrayList with key-values reversed

reverse

public static <K,V> java.util.HashMap<V,K> reverse(java.util.Map<K,V> in)

Reverses keys and values of a HashMap

Parameters:

in - - a HashMap

Returns:

out - a HashMap with key-values reversed

reverseDuplicateValues

public static <K,V> java.util.HashMap<V,java.util.ArrayList<K>> reverseDuplicateValues(java.util.Map<K,V> in)

reverseDouble

public static <K1,K2,V,M extends java.util.Map<K2,V>> java.util.HashMap<K2,java.util.HashMap<K1,V>> reverseDouble(java.util.Map<K1,M> dblMap)

fromPairs

public static <K,V> java.util.HashMap<K,V> fromPairs(Pair<K,V>[] pairs)

fromPairs

public static <K,V> java.util.HashMap<K,V> fromPairs(java.lang.Iterable<Pair<K,V>> pairs)

toString

public static <K,V> java.lang.String toString(java.util.Map<K,V> map)

getIndex

public static <K> int getIndex(java.util.Map<K,java.lang.Integer> k2ndx,
               K key)

retainAll

public static <K> void retainAll(java.util.Map<K,?> map,
                 java.util.Collection<K> set)

removeAll

public static <K> void removeAll(java.util.Map<K,?> map,
                 java.util.Collection<K> set)

toPairs

public static <K,V> java.util.ArrayList<Pair<K,V>> toPairs(java.util.Map<K,V> map)