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1   /*
2    * #%L
3    * JavaHg
4    * %%
5    * Copyright (C) 2011 aragost Trifork ag
6    * %%
7    * Permission is hereby granted, free of charge, to any person obtaining a copy
8    * of this software and associated documentation files (the "Software"), to deal
9    * in the Software without restriction, including without limitation the rights
10   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11   * copies of the Software, and to permit persons to whom the Software is
12   * furnished to do so, subject to the following conditions:
13   * 
14   * The above copyright notice and this permission notice shall be included in
15   * all copies or substantial portions of the Software.
16   * 
17   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23   * THE SOFTWARE.
24   * #L%
25   */
26  package com.aragost.javahg.commands;
27  
28  import java.io.IOException;
29  
30  import com.aragost.javahg.Changeset;
31  import com.aragost.javahg.Repository;
32  import com.aragost.javahg.commands.flags.RollbackCommandFlags;
33  import com.aragost.javahg.internals.HgInputStream;
34  import com.aragost.javahg.internals.RuntimeIOException;
35  import com.aragost.javahg.internals.Utils;
36  
37  /**
38   * Command class for executing <tt>hg rollback</tt>. Set flags from
39   * {@link RollbackCommandFlags} and call the{@link #execute} method.
40   */
41  public class RollbackCommand extends RollbackCommandFlags {
42  
43      private static final byte[] REPOSITORY_TIP_ROLLBACK_REVSION = "repository tip rolled back to revision ".getBytes();
44  
45      /**
46       * @param repository
47       *            the repository associated with this command.
48       */
49      public RollbackCommand(Repository repository) {
50          super(repository);
51      }
52  
53      /**
54       * Rollback last transaction.
55       * 
56       * @return The new tip of the repository
57       */
58      public Changeset execute() {
59          HgInputStream stream = launchStream();
60          try {
61              stream.mustMatch(REPOSITORY_TIP_ROLLBACK_REVSION);
62              int rev = stream.decimalIntUpTo(' ');
63              stream.consumeAll();
64              return Utils.single(LogCommand.on(getRepository()).rev(String.valueOf(rev)).execute());
65          } catch (IOException e) {
66              throw new RuntimeIOException(e);
67          }
68      }
69  
70  }