Application: gvSIG desktop » Library: org.gvsig.tools

package org.gvsig.tools.util;

import java.util.Collections;

import java.util.Iterator;

import java.util.Map;

/**

 *

 * @author jjdelcerro

 * @param <K> the type of keys maintained by this map

 * @param <V> the type of mapped values

 */

public interface UnmodifiableBasicMap<K,V> extends UnmodifiableBasicCollection<V>, GetItemByKeyWithSize<K,V> {

    @Override

    public V get(K key);

    public boolean containsKey(K key);

    public UnmodifiableBasicSet<K> keySet();

    public Map<K,V> toMap();

    public final UnmodifiableBasicMap EMPTY_UNMODIFIABLEBASICMAP = new UnmodifiableBasicMap() {

        @Override

        public Object get(Object key) {

            return null;

        }

        @Override

        public boolean isEmpty() {

            return true;

        }

        @Override

        public boolean containsKey(Object key) {

            return false;

        }

        @Override

        public Map toMap() {

            return Collections.EMPTY_MAP;

        }

        @Override

        public int size() {

            return 0;

        }

        @Override

        public Iterator iterator() {

            return Collections.EMPTY_MAP.entrySet().iterator();

        }

        @Override

        public UnmodifiableBasicSet keySet() {

            return UnmodifiableBasicSet.EMPTY_UNMODIFIABLEBASICSET;

        }

    };    

}