| /* |
| * 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.transformation.helpers; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.avalon.framework.configuration.Configuration; |
| import org.apache.avalon.framework.configuration.ConfigurationException; |
| import org.apache.avalon.framework.configuration.DefaultConfigurationSerializer; |
| import org.apache.avalon.framework.parameters.Parameters; |
| import org.xml.sax.SAXException; |
| |
| /** |
| * An Avalon <code>Configuration</code> factory that allows {variables} to be |
| * replaced with values from a lookup table. |
| * |
| * @author <a href="jefft@apache.org">Jeff Turner</a> |
| * @version CVS $Id$ |
| */ |
| public class VariableConfiguration { |
| public static final String UNSET_VAR="unset"; |
| private Configuration conf; |
| private Map vars = new HashMap(); |
| |
| /** Constructor. |
| * @param conf Template Configuration with {variables} to marking where |
| * values should be interpolated. May be <code>null</code>. |
| */ |
| public VariableConfiguration(Configuration conf) { |
| this.conf = conf; |
| } |
| |
| /** Add a name-value pair. |
| */ |
| public void addVariable(String name, String value) { |
| vars.put(name, value); |
| } |
| |
| /** Add a set of name-value pairs. |
| */ |
| public void addVariables(Parameters params) { |
| String[] names = params.getNames(); |
| for (int i=0; i<names.length; i++) { |
| String paramVal = params.getParameter(names[i], null); |
| if (paramVal != null) { |
| vars.put(names[i], paramVal); |
| } |
| } |
| } |
| |
| /** |
| * Get a generated Configuration with interpolated variable values. |
| * @return The Configuration passed in the constructor, with {variable} |
| * tokens in attributes and element bodies replaced with values (if |
| * specified), or <code>null</code>. |
| */ |
| public Configuration getConfiguration() throws SAXException, ConfigurationException { |
| |
| if (this.conf == null) return null; |
| InterpolatingConfigurationHandler handler = new InterpolatingConfigurationHandler(this.vars, this.conf.getLocation()); |
| DefaultConfigurationSerializer ser = new DefaultConfigurationSerializer(); |
| ser.serialize(handler, this.conf); |
| return handler.getConfiguration(); |
| } |
| |
| } |