project/com.nokia.carbide.cpp.epoc.engine/src/com/nokia/carbide/internal/cpp/epoc/engine/model/UnmodifiableKeyMap.java
/*
* Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of the License "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description:
*
*/
package com.nokia.carbide.internal.cpp.epoc.engine.model;
import java.util.*;
/**
* This is a map whose keys are unmodifiable.
*
*/
public class UnmodifiableKeyMap<K, V> implements Map<K, V> {
private static final String MSG = "The keys in this map may not be modified."; //$NON-NLS-1$
private Map<K, V> map;
public UnmodifiableKeyMap(Map<K, V> realMap) {
this.map = realMap;
}
/* (non-Javadoc)
* @see java.util.Map#clear()
*/
public void clear() {
throw new UnsupportedOperationException(MSG);
}
/* (non-Javadoc)
* @see java.util.Map#containsKey(java.lang.Object)
*/
public boolean containsKey(Object key) {
return map.containsKey(key);
}
/* (non-Javadoc)
* @see java.util.Map#containsValue(java.lang.Object)
*/
public boolean containsValue(Object value) {
return map.containsValue(value);
}
/* (non-Javadoc)
* @see java.util.Map#entrySet()
*/
public Set<java.util.Map.Entry<K, V>> entrySet() {
return Collections.unmodifiableSet(map.entrySet());
}
/* (non-Javadoc)
* @see java.util.Map#get(java.lang.Object)
*/
public V get(Object key) {
return map.get(key);
}
/* (non-Javadoc)
* @see java.util.Map#isEmpty()
*/
public boolean isEmpty() {
return map.isEmpty();
}
/* (non-Javadoc)
* @see java.util.Map#keySet()
*/
public Set<K> keySet() {
return Collections.unmodifiableSet(map.keySet());
}
/* (non-Javadoc)
* @see java.util.Map#put(java.lang.Object, java.lang.Object)
*/
public V put(K key, V value) {
if (!map.containsKey(key))
throw new UnsupportedOperationException(MSG);
return map.put(key, value);
}
/* (non-Javadoc)
* @see java.util.Map#putAll(java.util.Map)
*/
public void putAll(Map<? extends K, ? extends V> t) {
for (Map.Entry<? extends K, ? extends V> entry : t.entrySet()) {
put(entry.getKey(), entry.getValue());
}
}
/* (non-Javadoc)
* @see java.util.Map#remove(java.lang.Object)
*/
public V remove(Object key) {
throw new UnsupportedOperationException(MSG);
}
/* (non-Javadoc)
* @see java.util.Map#size()
*/
public int size() {
return map.size();
}
/* (non-Javadoc)
* @see java.util.Map#values()
*/
public Collection<V> values() {
return map.values();
}
}