maven-faces-plugin/src/main/java/org/apache/myfaces/trinidadbuild/plugin/faces/JarResourceResolver.java

/*
 * 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.myfaces.trinidadbuild.plugin.faces;

import java.io.InputStream;

import java.net.MalformedURLException;
import java.net.URL;

import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.stream.StreamSource;

public /**
   * this resolver is to make sure imports of other stylesheets within the classpath get loaded
   */
  class JarResourceResolver implements URIResolver {
    public Source resolve(String href, String base) throws TransformerException {
      if (!href.startsWith("jar:")) 
      {
        try {
          URL defaultResolvedUrl = new URL(new URL(base), href);
          return new StreamSource(defaultResolvedUrl.toString());
        } 
        catch (MalformedURLException ex) 
        {
          throw new TransformerException(ex);
        }
      } 
      else 
      {
        try 
        {
          String resource = href.substring(4); // chop off the jar:
          InputStream is = getClass().getResourceAsStream(resource);
          return new StreamSource(is, resource);
        } 
        catch (Exception ex) 
        {
          throw new TransformerException(ex);
        }
      }
    }
  }