| /* |
| * 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.selection; |
| |
| import org.apache.avalon.framework.parameters.Parameters; |
| import org.apache.avalon.framework.thread.ThreadSafe; |
| |
| import java.util.Map; |
| |
| /** |
| * A <code>Selector</code> that matches a string in the parameters object passed to it. |
| * |
| * <pre> |
| * <map:selector name="parameter" factory="org.apache.cocoon.selection.ParameterSelector"/> |
| * |
| * <map:select type="parameter"> |
| * <map:parameter name="parameter-selector-test" value="{mySitemapParameter}"/> |
| * |
| * <map:when test="myParameterValue"> |
| * <!-- executes iff {mySitemapParameter} == "myParameterValue" --> |
| * <map:transform src="stylesheets/page/uk.xsl"/> |
| * </map:when> |
| * <map:otherwise> |
| * <map:transform src="stylesheets/page/us.xsl"/> |
| * </map:otherwise> |
| * </map:select> |
| * </pre> |
| * |
| * The purpose of this selector is to allow an action to set parameters |
| * and to be able to select between different pipeline configurations |
| * depending on those parameters. |
| * |
| * @version $Id$ |
| */ |
| public class ParameterSelector implements ThreadSafe, Selector { |
| |
| public boolean select(String expression, Map objectModel, Parameters parameters) { |
| String compareToString = parameters.getParameter("parameter-selector-test", null); |
| return compareToString != null && compareToString.equals(expression); |
| } |
| } |