/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.cocoon.faces.context;

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

/**
 * Base class for JSF context maps
 *
 * @author <a href="mailto:vgritsenko@apache.org">Vadim Gritsenko</a>
 * @version CVS $Id$
 */
abstract class BaseMap extends java.util.AbstractMap {

    static class Entry implements Map.Entry {
        private final Object key;
        private final Object value;

        Entry(Object key, Object value) {
            this.key = key;
            this.value = value;
        }

        public Object getKey() {
            return key;
        }

        public Object getValue() {
            return value;
        }

        public Object setValue(Object value) {
            throw new UnsupportedOperationException();
        }

        public int hashCode() {
            return (key != null ? key.hashCode() : 0) ^ (value != null ? value.hashCode() : 0);
        }

        public boolean equals(Object obj) {
            if (obj == null || !(obj instanceof Map.Entry)) {
                return false;
            }

            Map.Entry other = (Map.Entry) obj;
            Object key = other.getKey();
            if (key == this.key || key != null && key.equals(this.key)) {
                Object value = other.getValue();
                return value == this.value || value != null && value.equals(this.value);
            }
            return false;
        }
    }


    BaseMap() {
    }

    public void clear() {
        throw new UnsupportedOperationException();
    }

    public void putAll(Map t) {
        throw new UnsupportedOperationException();
    }

    public Object remove(Object key) {
        throw new UnsupportedOperationException();
    }

    public Set entrySet() {
        throw new UnsupportedOperationException();
    }
}