/*
* 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.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.
*
* @author <a href="mailto:leo.sutic@inspireinfrastructure.com">Leo Sutic</a>
* @author <a href="mailto:sylvain@apache.org">Sylvain Wallez</a>
* @version CVS $Id$
*/
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);
}
}