001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041:
042: package org.netbeans.modules.mercurial;
043:
044: import java.io.*;
045: import org.netbeans.modules.mercurial.ui.diff.Setup;
046: import org.netbeans.modules.mercurial.util.*;
047:
048: /**
049: * File revisions cache. It can access pristine files.
050: *
051: * XXX and what exactly is cached here?!
052: *
053: * @author Petr Kuzel
054: */
055: public class VersionsCache {
056:
057: private static VersionsCache instance;
058:
059: /** Creates a new instance of VersionsCache */
060: private VersionsCache() {
061: }
062:
063: public static synchronized VersionsCache getInstance() {
064: if (instance == null) {
065: instance = new VersionsCache();
066: }
067: return instance;
068: }
069:
070: /**
071: * Loads the file in specified revision.
072: *
073: * @return null if the file does not exist in given revision
074: */
075: public File getFileRevision(File base, String revision)
076: throws IOException {
077: if (revision.equals("-1"))
078: return null; // NOI18N
079:
080: File repository = Mercurial.getInstance()
081: .getTopmostManagedParent(base);
082: if (Setup.REVISION_BASE.equals(revision)) {
083: try {
084: File tempFile = File.createTempFile("tmp", "-"
085: + base.getName()); //NOI18N
086: HgCommand.doCat(repository, base, tempFile, null);
087: if (tempFile.length() == 0)
088: return null;
089: return tempFile;
090: } catch (HgException e) {
091: IOException ioe = new IOException();
092: ioe.initCause(e);
093: throw ioe;
094: }
095: } else if (Setup.REVISION_CURRENT.equals(revision)) {
096: return base;
097: } else {
098: try {
099: File tempFile = File.createTempFile("tmp", "-"
100: + base.getName()); //NOI18N
101: HgCommand.doCat(repository, base, tempFile, revision,
102: null);
103: if (tempFile.length() == 0)
104: return null;
105: return tempFile;
106: } catch (HgException e) {
107: IOException ioe = new IOException();
108: ioe.initCause(e);
109: throw ioe;
110: }
111: }
112: }
113: }
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