package org.apache.maven.jxr.pacman;

 /*

  * 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.IOException;

 import java.util.Hashtable;

 /**

  * <p>

  *

  * Singleton that handles holding references to JavaFiles. This allows

  * Alexandria to lookup and see if a file has already been parsed out and then

  * it can load the information from memory instead of reparsing the file. </p>

  * <p>

  *

  * Note. This assumes that the file will not be modified on disk while

  * Alexandria is running. </p>

  */

 public class FileManager

 {

     /**

      * The Singleton instance of this FileManager

      */

     private static FileManager instance = new FileManager();

     private Hashtable files = new Hashtable();

     private String encoding = null;

     /**

      * Get an instance of the FileManager

      */

     public static FileManager getInstance()

     {

         return instance;

     }

     /**

      * Get a file from it's name. If the file does not exist within the

      * FileManager, create a new one and return it.

      */

     public JavaFile getFile( String name )

         throws IOException

     {

         JavaFile real = (JavaFile) this.files.get( name );

         if ( real == null )

         {

             real = new JavaFileImpl( name, this.getEncoding() );

             this.addFile( real );

         }

         return real;

     }

     /**

      * Add a file to this filemanager.

      */

     public void addFile( JavaFile file )

     {

         this.files.put( file.getFilename(), file );

     }

     /**

      * Encoding is the encoding of source files.

      *

      * @param encoding encoding of source files

      */

     public void setEncoding( String encoding )

     {

         this.encoding = encoding;

     }

     /**

      * see setEncoding(String)

      *

      * @see #setEncoding(String)

      */

     public String getEncoding()

     {

         return encoding;

     }

 }