/*

  * 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.config.impl;

 import java.io.IOException;

 import java.io.InputStream;

 import java.net.JarURLConnection;

 import java.net.URL;

 import java.util.jar.JarEntry;

 import java.util.logging.Logger;

 import javax.faces.context.ExternalContext;

 import org.apache.myfaces.shared.util.ClassUtils;

 import org.xml.sax.EntityResolver;

 import org.xml.sax.InputSource;

 /**

  * SAX EntityResolver to provide JSF-specific resources (DTDs) for well-known identifiers.

  *

  * @author Manfred Geiler (latest modification by $Author$)

  * @author Thomas Spiegl

  * @version $Revision$ $Date$

  */

 public class FacesConfigEntityResolver

     implements EntityResolver

 {

     //private static final Log log = LogFactory.getLog(FacesConfigEntityResolver.class);

     private static final Logger log = Logger.getLogger(FacesConfigEntityResolver.class.getName());

     private static final String FACES_CONFIG_1_0_DTD_SYSTEM_ID = "http://java.sun.com/dtd/web-facesconfig_1_0.dtd";

     private static final String FACES_CONFIG_1_0_DTD_RESOURCE

             = "org.apache.myfaces.resource".replace('.', '/') + "/web-facesconfig_1_0.dtd";

     private static final String FACES_CONFIG_1_1_DTD_SYSTEM_ID = "http://java.sun.com/dtd/web-facesconfig_1_1.dtd";

     private static final String FACES_CONFIG_1_1_DTD_RESOURCE

             = "org.apache.myfaces.resource".replace('.', '/') + "/web-facesconfig_1_1.dtd";

     private ExternalContext _externalContext = null;

     public FacesConfigEntityResolver(ExternalContext context)

     {

         _externalContext = context;

     }

     public FacesConfigEntityResolver()

     {

     }

     public InputSource resolveEntity(String publicId,

                                      String systemId)

         throws IOException

     {

         InputStream stream;

         if (systemId.equals(FACES_CONFIG_1_0_DTD_SYSTEM_ID))

         {

             stream = ClassUtils.getResourceAsStream(FACES_CONFIG_1_0_DTD_RESOURCE);

         }

         else if (systemId.equals(FACES_CONFIG_1_1_DTD_SYSTEM_ID))

         {

             stream = ClassUtils.getResourceAsStream(FACES_CONFIG_1_1_DTD_RESOURCE);

         }

         else if (systemId.startsWith("jar:"))

         {

             URL url = new URL(systemId);

             JarURLConnection conn = (JarURLConnection) url.openConnection();

             // see MYFACES-1982

             conn.setUseCaches(false);

             JarEntry jarEntry = conn.getJarEntry();

             if (jarEntry == null)

             {

                 log.severe("JAR entry '" + systemId + "' not found.");

             }

             //_jarFile.getInputStream(jarEntry);

             stream = conn.getJarFile().getInputStream(jarEntry);

         }

         else

         {

             if (_externalContext == null)

             {

                 stream = ClassUtils.getResourceAsStream(systemId);

             }

             else

             {

                 if (systemId.startsWith("file:"))

                 {

                     systemId = systemId.substring(7); // remove file://

                 }

                 stream = _externalContext.getResourceAsStream(systemId);

             }

         }

         if (stream == null)

         {

             return null;

         }

         InputSource is = new InputSource(stream);

         is.setPublicId(publicId);

         is.setSystemId(systemId);

         is.setEncoding("ISO-8859-1");

         return is;

     }

 }