Mega Code Archive
Multi Value Map Array List
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/*
* Copyright WizTools.org
* Licensed under the Apache License, Version 2.0:
* http://www.apache.org/licenses/LICENSE-2.0
*/
//package org.wiztools.commons;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* This class does not implement java.util.Map<K, V> interface.
* This class encapsulates a HashMap holding a List of values associated with a
* particular key.
* @author subwiz
*/
public class MultiValueMapArrayList<K, V> implements MultiValueMap<K, V>{
private Map<K, List<V>> map = new LinkedHashMap<K, List<V>>();
public Collection<V> put(K key, V value){
List<V> l = map.get(key);
if(l == null){
l = new ArrayList<V>();
}
l.add(value);
return map.put(key, l);
}
public Collection<V> get(K key){
return map.get(key);
}
public Set<K> keySet(){
return map.keySet();
}
public int size() {
return map.size();
}
public boolean isEmpty() {
if(size() == 0)
return true;
return false;
}
public boolean containsKey(K key) {
return map.containsKey(key);
}
public boolean containsValue(V value) {
for(K key: map.keySet()){
List<V> values = map.get(key);
if(values.contains(value)){
return true;
}
}
return false;
}
public Collection<V> remove(K key) {
return map.remove(key);
}
public void clear() {
map.clear();
}
public Collection<V> values() {
List<V> values = new ArrayList<V>();
for(K key: map.keySet()){
List<V> v = map.get(key);
values.addAll(v);
}
return values;
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (!(obj instanceof MultiValueMap)) {
return false;
}
final MultiValueMap<K, V> other = (MultiValueMap<K, V>) obj;
if (this.keySet() != other.keySet() && (this.keySet() == null || !this.keySet().equals(other.keySet()))) {
return false;
}
final Collection thisValues = this.values();
final Collection otherValues = other.values();
if (thisValues != otherValues && (thisValues == null || !thisValues.equals(otherValues))) {
return false;
}
return true;
}
@Override
public int hashCode() {
int hash = 7;
hash = 47 * hash + (this.map != null ? this.map.hashCode() : 0);
return hash;
}
@Override
public String toString() {
return map.toString();
}
}
interface MultiValueMap<K, V> {
void clear();
boolean containsKey(K key);
boolean containsValue(V value);
Collection<V> get(K key);
boolean isEmpty();
Set<K> keySet();
Collection<V> put(K key, V value);
Collection<V> remove(K key);
int size();
Collection<V> values();
}
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