| /* |
| * 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.commons.chain2.web; |
| |
| import java.util.Map; |
| |
| /** |
| * <p>Map.Entry implementation that can be constructed to either be read-only |
| * or not.</p> |
| * |
| * @param <K> the type of keys maintained by this map |
| * @param <V> the type of mapped values |
| * |
| * @version $Id$ |
| */ |
| public class MapEntry<K, V> implements Map.Entry<K, V> { |
| |
| /** |
| * <p>The entry key.</p> |
| */ |
| private final K key; |
| |
| /** |
| * <p>The entry value.</p> |
| */ |
| private V value; |
| |
| /** |
| * <p>Whether the entry can be modified.</p> |
| */ |
| private boolean modifiable = false; |
| |
| /** |
| * <p>Creates a map entry that can either allow modifications or not.</p> |
| * |
| * @param key The entry key |
| * @param value The entry value |
| * @param modifiable Whether the entry should allow modification or not |
| */ |
| public MapEntry(K key, V value, boolean modifiable) { |
| this.key = key; |
| this.value = value; |
| this.modifiable = modifiable; |
| } |
| |
| /** |
| * <p>Gets the entry key.</p> |
| * |
| * @return The entry key |
| */ |
| public K getKey() { |
| return key; |
| } |
| |
| /** |
| * <p>Gets the entry value.</p> |
| * |
| * @return The entry key |
| */ |
| public V getValue() { |
| return value; |
| } |
| |
| /** |
| * <p>Sets the entry value if the entry can be modified.</p> |
| * |
| * @param val The new value |
| * @return The old entry value |
| * @throws UnsupportedOperationException If the entry cannot be modified |
| */ |
| public V setValue(V val) { |
| if (modifiable) { |
| V oldVal = this.value; |
| this.value = val; |
| return oldVal; |
| } else { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| /** |
| * <p>Determines if this entry is equal to the passed object.</p> |
| * |
| * @param o The object to test |
| * @return True if equal, else false |
| */ |
| @Override |
| public boolean equals(Object o) { |
| if (o != null && o instanceof Map.Entry) { |
| Map.Entry<?, ?> entry = (Map.Entry<?, ?>) o; |
| return (this.getKey() == null ? |
| entry.getKey() == null : this.getKey().equals(entry.getKey())) && |
| (this.getValue() == null ? |
| entry.getValue() == null : this.getValue().equals(entry.getValue())); |
| } |
| return false; |
| } |
| |
| /** |
| * <p>Returns the hashcode for this entry.</p> |
| * |
| * @return The and'ed hashcode of the key and value |
| */ |
| @Override |
| public int hashCode() { |
| return (this.getKey() == null ? 0 : this.getKey().hashCode()) ^ |
| (this.getValue() == null ? 0 : this.getValue().hashCode()); |
| } |
| |
| } |