| /* |
| * Copyright 1999-2004 The Apache Software Foundation. |
| * |
| * 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.apache.cocoon.matching; |
| |
| import org.apache.avalon.framework.parameters.Parameters; |
| import org.apache.avalon.framework.thread.ThreadSafe; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * This class allows for matching based on a parameter provided from the sitemap. |
| * If the specified sitemap parameter exists, its value is retrieved for later |
| * sitemap substitution. |
| * |
| * <p><b>Example:</b></p> |
| * <pre> |
| * <map:match type="parameter" pattern="dest"> |
| * <map:redirect-to uri="{1}"/> |
| * </map:match> |
| * </pre> |
| * |
| * @version $Id$ |
| */ |
| public class ParameterMatcher implements Matcher, ThreadSafe |
| { |
| /** |
| * Match method to see if the sitemap parameter exists. If it does |
| * have a value the parameter added to the array list for later |
| * sitemap substitution. |
| * |
| * @param pattern name of sitemap parameter to find |
| * @param objectModel environment passed through via cocoon |
| * @return null or map containing value of sitemap parameter 'pattern' |
| */ |
| public Map match(String pattern, Map objectModel, Parameters parameters) { |
| |
| String parameter = parameters.getParameter(pattern, null); |
| if (parameter == null) { |
| return null; // no parameter defined |
| } else { |
| Map map = new HashMap(); |
| map.put("1", parameter); |
| return map; // parameter defined, return map |
| } |
| } |
| } |