/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.crsh.util;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Set;
public abstract class SimpleMap<K, V> extends AbstractMap<K, V> {
protected abstract Iterator<K> keys();
@Override
public abstract V get(Object key);
@Override
public final boolean containsKey(Object key) {
return get(key) != null;
}
@Override
public final Set<Entry<K, V>> entrySet() {
return entries;
}
private AbstractSet<Entry<K, V>> entries = new AbstractSet<Entry<K, V>>() {
@Override
public Iterator<Entry<K, V>> iterator() {
final Iterator<K> names = keys();
return new Iterator<Entry<K, V>>() {
public boolean hasNext() {
return names.hasNext();
}
public Entry<K, V> next() {
final K name = names.next();
return new Entry<K, V>() {
public K getKey() {
return name;
}
public V getValue() {
return get(name);
}
public V setValue(V value) {
throw new UnsupportedOperationException();
}
};
}
public void remove() {
throw new UnsupportedOperationException();
}
};
}
@Override
public int size() {
int size = 0;
for (Iterator<K> names = keys();names.hasNext();) {
size++;
names.next();
}
return size;
}
};
}