| /* |
| * 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.base; |
| |
| import java.util.Map; |
| |
| import org.apache.commons.chain2.Command; |
| |
| /** |
| * <p>Copy a specified literal value, or a context attribute stored under |
| * the <code>fromKey</code> (if any), to the <code>toKey</code>.</p> |
| * |
| * @param <K> the type of keys maintained by the context associated with this command |
| * @param <V> the type of mapped values |
| * @param <C> Type of the context associated with this command |
| * |
| * @version $Id$ |
| */ |
| public class CopyCommand<K, V, C extends Map<K, V>> implements Command<K, V, C> { |
| |
| // -------------------------------------------------------------- Properties |
| |
| private K fromKey = null; |
| |
| /** |
| * <p>Return the context attribute key for the source attribute.</p> |
| * @return The source attribute key. |
| */ |
| public K getFromKey() { |
| return this.fromKey; |
| } |
| |
| /** |
| * <p>Set the context attribute key for the source attribute.</p> |
| * |
| * @param fromKey The new key |
| */ |
| public void setFromKey(K fromKey) { |
| this.fromKey = fromKey; |
| } |
| |
| private K toKey = null; |
| |
| /** |
| * <p>Return the context attribute key for the destination attribute.</p> |
| * @return The destination attribute key. |
| */ |
| public K getToKey() { |
| return this.toKey; |
| } |
| |
| /** |
| * <p>Set the context attribute key for the destination attribute.</p> |
| * |
| * @param toKey The new key |
| */ |
| public void setToKey(K toKey) { |
| this.toKey = toKey; |
| } |
| |
| // ---------------------------------------------------------- Filter Methods |
| |
| /** |
| * <p>Copy a specified literal value, or a context attribute stored under |
| * the <code>fromKey</code> (if any), to the <code>toKey</code>.</p> |
| * |
| * @param context {@link org.apache.commons.chain2.Context Context} in which we are operating |
| * |
| * @return <code>false</code> so that processing will continue |
| * @throws org.apache.commons.chain2.ChainException in the if an error occurs during execution. |
| */ |
| public boolean execute(C context) { |
| if (containsKeys(context)) { |
| V value = context.get(getFromKey()); |
| context.put(getToKey(), value); |
| } |
| return false; |
| } |
| |
| private boolean containsKeys(C context) { |
| return context.containsKey(getFromKey()) && context.containsKey(getToKey()); |
| } |
| |
| } |