001    /*--------------------------------------------------------------------------+
002    $Id: CanonicalFilePool.java 26268 2010-02-18 10:44:30Z juergens $
003    |                                                                          |
004    | Copyright 2005-2010 Technische Universitaet Muenchen                     |
005    |                                                                          |
006    | Licensed under the Apache License, Version 2.0 (the "License");          |
007    | you may not use this file except in compliance with the License.         |
008    | You may obtain a copy of the License at                                  |
009    |                                                                          |
010    |    http://www.apache.org/licenses/LICENSE-2.0                            |
011    |                                                                          |
012    | Unless required by applicable law or agreed to in writing, software      |
013    | distributed under the License is distributed on an "AS IS" BASIS,        |
014    | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
015    | See the License for the specific language governing permissions and      |
016    | limitations under the License.                                           |
017    +--------------------------------------------------------------------------*/
018    package edu.tum.cs.commons.filesystem;
019    
020    import java.util.HashMap;
021    import java.util.Map;
022    
023    /**
024     * Pool for {@link CanonicalFile}s.
025     * 
026     * @author juergens
027     * @author $Author: juergens $
028     * @version $Rev: 26268 $
029     * @levd.rating GREEN Hash: 3FEBAFF4FADD8361BE4760B539F64236
030     */
031    public class CanonicalFilePool {
032    
033            /** Set that manages pooled files */
034            private final Map<CanonicalFile, CanonicalFile> internedFiles = new HashMap<CanonicalFile, CanonicalFile>();
035    
036            /** Get file from pool */
037            public CanonicalFile intern(CanonicalFile file) {
038                    if (!internedFiles.containsKey(file)) {
039                            internedFiles.put(file, file);
040                    }
041    
042                    return internedFiles.get(file);
043            }
044    }