package org.apache.maven.doxia.siterenderer;
   
   /*
    * 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.
   */
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  
  import org.apache.velocity.runtime.resource.Resource;
  import org.apache.velocity.runtime.resource.loader.ResourceLoader;
  import org.apache.velocity.exception.ResourceNotFoundException;
  import org.apache.commons.collections.ExtendedProperties;
  import org.codehaus.plexus.util.IOUtil;
  
  /**
   * Skin resource loader: gets content from context classloader, which should contain skin artifact,
   * and normalizes newlines (see <a href="http://jira.codehaus.org/browse/DOXIASITETOOLS-87">DOXIASITETOOLS-87</a>.
   * 
   * @author Hervé Boutemy
   */
  public class SkinResourceLoader
      extends ResourceLoader
  {
      public void init( ExtendedProperties configuration )
      {
      }
  
      public synchronized InputStream getResourceStream( String name )
          throws ResourceNotFoundException
      {
          ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
  
          if ( name.startsWith( "/" ) )
          {
              name = name.substring( 1 );
          }
  
          return normalizeNewline( classLoader.getResourceAsStream( name ) );
      }
  
      InputStream normalizeNewline( InputStream in )
          throws ResourceNotFoundException
      {
          if ( in == null )
          {
              return null;
          }
  
          try
          {
              byte[] content = IOUtil.toByteArray( in );
  
              // following code based on org.apache.maven.doxia.sink.AbstractSink.unifyEOLs(String)
              
              byte[] EOL = System.getProperty( "line.separator" ).getBytes();
  
              final int size = content.length;
  
              ByteArrayOutputStream out = new ByteArrayOutputStream( size );
  
              for ( int i = 0; i < size; i++ )
              {
                  byte b = content[i];
  
                  if ( b == '\r' )
                  {
                      if ( ( i + 1 ) < size && content[i + 1] == '\n' )
                      {
                          i++;
                      }
  
                      out.write( EOL );
                  }
                  else if ( b == '\n' )
                  {
                      out.write( EOL );
                  }
                  else
                  {
                      out.write( b );
                  }
             }
 
             return new ByteArrayInputStream( out.toByteArray() );
         }
         catch ( IOException ioe )
         {
             throw new ResourceNotFoundException( "cannot read resource", ioe );
         }
         finally
         {
             IOUtil.close( in );
         }
     }
 
     public boolean isSourceModified( Resource resource )
     {
         return false;
     }
 
     public long getLastModified( Resource resource )
     {
         return 0;
     }
 }