AbstractReadOnlyMap.java

/*
 * Copyright 2016 Christoph Böhme
 *
 * Licensed under the Apache License, Version 2.0 the "License";
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.culturegraph.mf.metamorph.api.helpers;

import java.util.Collection;
import java.util.Map;
import java.util.Set;

/**
 * Base class for maps which are read only and do not allow access to their
 * full contents.
 *
 * @author Markus Michael Geipel
 *
 * @param <K>
 * @param <V>
 */
public abstract class AbstractReadOnlyMap<K, V> implements Map<K, V> {

	@Override
	public final int size() {
		throw new UnsupportedOperationException();
	}

	@Override
	public final boolean isEmpty() {
		throw new UnsupportedOperationException();
	}

	@Override
	public final boolean containsKey(final Object key) {
		return get(key) != null;
	}

	@Override
	public final boolean containsValue(final Object value) {
		throw new UnsupportedOperationException();
	}

	@Override
	public final V put(final K key, final V value) {
		throw new UnsupportedOperationException();
	}

	@Override
	public final V remove(final Object key) {
		throw new UnsupportedOperationException();
	}

	@Override
	public final void putAll(final Map<? extends K, ? extends V> m) {
		throw new UnsupportedOperationException();

	}

	@Override
	public final void clear() {
		throw new UnsupportedOperationException();
	}

	@Override
	public final Set<K> keySet() {
		throw new UnsupportedOperationException();
	}

	@Override
	public final Collection<V> values() {
		throw new UnsupportedOperationException();
	}

	@Override
	public final Set<java.util.Map.Entry<K, V>> entrySet() {
		throw new UnsupportedOperationException();
	}

}