src/org/netbeans/modules/git/VersionsCache.java

   1 /*
   2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
   3  *
   4  * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
   5  *
   6  * The contents of this file are subject to the terms of either the GNU
   7  * General Public License Version 2 only ("GPL") or the Common
   8  * Development and Distribution License("CDDL") (collectively, the
   9  * "License"). You may not use this file except in compliance with the
  10  * License. You can obtain a copy of the License at
  11  * http://www.netbeans.org/cddl-gplv2.html
  12  * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
  13  * specific language governing permissions and limitations under the
  14  * License.  When distributing the software, include this License Header
  15  * Notice in each file and include the License file at
  16  * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this
  17  * particular file as subject to the "Classpath" exception as provided
  18  * by Sun in the GPL Version 2 section of the License file that
  19  * accompanied this code. If applicable, add the following below the
  20  * License Header, with the fields enclosed by brackets [] replaced by
  21  * your own identifying information:
  22  * "Portions Copyrighted [year] [name of copyright owner]"
  23  *
  24  * Contributor(s):
  25  *
  26  * The Original Software is NetBeans. The Initial Developer of the Original
  27  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
  28  * Microsystems, Inc. All Rights Reserved.
  29  * Portions Copyright 2008 Alexander Coles (Ikonoklastik Productions).
  30  *
  31  * If you wish your version of this file to be governed by only the CDDL
  32  * or only the GPL Version 2, indicate your decision by adding
  33  * "[Contributor] elects to include this software in this distribution
  34  * under the [CDDL or GPL Version 2] license." If you do not indicate a
  35  * single choice of license, a recipient has the option to distribute
  36  * your version of this file under either the CDDL, the GPL Version 2 or
  37  * to extend the choice of license to its licensees as provided above.
  38  * However, if you add GPL Version 2 code and therefore, elected the GPL
  39  * Version 2 license, then the option applies only if the new code is
  40  * made subject to such option by the copyright holder.
  41  */
  42 package org.netbeans.modules.git;
  43
  44 import java.io.File;
  45 import java.io.IOException;
  46 import org.netbeans.modules.git.ui.diff.Setup;
  47 import org.netbeans.modules.git.util.GitCommand;
  48
  49 /**
  50  * File revisions cache. It can access pristine files.
  51  *
  52  * XXX and what exactly is cached here?!
  53  *
  54  * @author Petr Kuzel
  55  */
  56 public class VersionsCache {
  57
  58     private static VersionsCache instance;
  59
  60     /** Creates a new instance of VersionsCache */
  61     private VersionsCache() {
  62     }
  63
  64     public static synchronized VersionsCache getInstance() {
  65         if (instance == null) {
  66             instance = new VersionsCache();
  67         }
  68         return instance;
  69     }
  70
  71     /**
  72      * Loads the file in specified revision.
  73      *
  74      * @return null if the file does not exist in given revision
  75      */
  76     public File getFileRevision(File base, String revision) throws IOException {
  77         if (revision.equals("-1")) {
  78             return null; // NOI18N
  79
  80         }
  81         File repository = Git.getInstance().getTopmostManagedParent(base);
  82         if (Setup.REVISION_BASE.equals(revision)) {
  83             try {
  84                 File tempFile = File.createTempFile("tmp", "-" + base.getName()); //NOI18N
  85
  86                 GitCommand.doCat(repository, base, tempFile, null);
  87                 if (tempFile.length() == 0) {
  88                     return null;
  89                 }
  90                 return tempFile;
  91             } catch (GitException e) {
  92                 IOException ioe = new IOException();
  93                 ioe.initCause(e);
  94                 throw ioe;
  95             }
  96         } else if (Setup.REVISION_CURRENT.equals(revision)) {
  97             return base;
  98         } else {
  99             try {
 100                 File tempFile = File.createTempFile("tmp", "-" + base.getName()); //NOI18N
 101
 102                 GitCommand.doCat(repository, base, tempFile, revision, null);
 103                 if (tempFile.length() == 0) {
 104                     return null;
 105                 }
 106                 return tempFile;
 107             } catch (GitException e) {
 108                 IOException ioe = new IOException();
 109                 ioe.initCause(e);
 110                 throw ioe;
 111             }
 112         }
 113     }
 114
 115 }