UnmodifiableMapImpl.java

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/*
 * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
 * Copyright (C) 2012 - Javolution (http://javolution.org/)
 * All rights reserved.
 * 
 * Permission to use, copy, modify, and distribute this software is
 * freely granted, provided that this notice is preserved.
 */
package javolution.util.internal.map;
 
import java.util.Iterator;
 
import javolution.util.function.Equality;
import javolution.util.service.MapService;
 
public class UnmodifiableMapImpl<K, V> extends MapView<K, V> {
 
    private class IteratorImpl implements Iterator<Entry<K, V>> {
        private final Iterator<Entry<K, V>> targetIterator = target()
                .iterator();
 
        @Override
        public boolean hasNext() {
            return targetIterator.hasNext();
        }
 
        @Override
        public Entry<K, V> next() {
            return targetIterator.next();
        }
 
        @Override
        public void remove() {
            throw new UnsupportedOperationException("Read-Only Map.");
        }
    }
 
    private static final long serialVersionUID = 0x600L; // Version.
 
    public UnmodifiableMapImpl(MapService<K, V> target) {
        super(target);
    }
 
    @Override
    public void clear() {
        throw new UnsupportedOperationException("Unmodifiable");
    }
 
    @Override
    public boolean containsKey(Object key) {
        return target().containsKey(key);
    }
 
    @Override
    public V get(Object key) {
        return target().get(key);
    }
 
    @Override
    public Iterator<Entry<K, V>> iterator() {
        return new IteratorImpl();
    }
 
    @Override
    public Equality<? super K> keyComparator() {
        return target().keyComparator();
    }
 
    @Override
    public V put(K key, V value) {
        throw new UnsupportedOperationException("Unmodifiable");
    }
 
    @Override
    public V remove(Object key) {
        throw new UnsupportedOperationException("Unmodifiable");
    }
 
    @Override
    public MapService<K, V> threadSafe() {
        return this;
    }
 
    @Override
    public Equality<? super V> valueComparator() {
        return target().valueComparator();
    }
 
}