/*******************************************************************************
 * 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.ofbiz.base.util.collections;

import java.util.Map;
import java.util.Objects;

import org.apache.ofbiz.base.util.UtilObject;

/** this class can go away when ofbiz switches to java 1.6, replaced by
 *  AbstractMap.SimpleImmutableEntry
 */
public class ReadOnlyMapEntry<K, V> implements Map.Entry<K, V> {
    private final K key;
    private final V value;

    public ReadOnlyMapEntry(K key, V value) {
        this.key = key;
        this.value = value;
    }

    @Override
    public K getKey() {
        return key;
    }

    @Override
    public V getValue() {
        return value;
    }

    @Override
    public V setValue(V value) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof Map.Entry<?, ?>)) {
            return false;
        }
        if (this == o) {
            return true;
        }
        Map.Entry<?, ?> other = (Map.Entry<?, ?>) o;
        return Objects.equals(getKey(), other.getKey()) && Objects.equals(getValue(), other.getValue());
    }

    @Override
    public int hashCode() {
        return UtilObject.doHashCode(getKey()) ^ UtilObject.doHashCode(getValue());
    }
}
