/*

  * #%L

  * JavaHg

  * %%

  * Copyright (C) 2011 aragost Trifork ag

  * %%

  * Permission is hereby granted, free of charge, to any person obtaining a copy

  * of this software and associated documentation files (the "Software"), to deal

  * in the Software without restriction, including without limitation the rights

  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

  * copies of the Software, and to permit persons to whom the Software is

  * furnished to do so, subject to the following conditions:

  * 

  * The above copyright notice and this permission notice shall be included in

  * all copies or substantial portions of the Software.

  * 

  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

  * THE SOFTWARE.

  * #L%

  */

 package com.aragost.javahg.commands;

 import java.io.IOException;

 import com.aragost.javahg.Changeset;

 import com.aragost.javahg.Repository;

 import com.aragost.javahg.commands.flags.RollbackCommandFlags;

 import com.aragost.javahg.internals.HgInputStream;

 import com.aragost.javahg.internals.RuntimeIOException;

 import com.aragost.javahg.internals.Utils;

 /**

  * Command class for executing <tt>hg rollback</tt>. Set flags from

  * {@link RollbackCommandFlags} and call the{@link #execute} method.

  */

 public class RollbackCommand extends RollbackCommandFlags {

     private static final byte[] REPOSITORY_TIP_ROLLBACK_REVSION = "repository tip rolled back to revision ".getBytes();

     /**

      * @param repository

      *            the repository associated with this command.

      */

     public RollbackCommand(Repository repository) {

         super(repository);

     }

     /**

      * Rollback last transaction.

      * 

      * @return The new tip of the repository

      */

     public Changeset execute() {

         HgInputStream stream = launchStream();

         try {

             stream.mustMatch(REPOSITORY_TIP_ROLLBACK_REVSION);

             int rev = stream.decimalIntUpTo(' ');

             stream.consumeAll();

             return Utils.single(LogCommand.on(getRepository()).rev(String.valueOf(rev)).execute());

         } catch (IOException e) {

             throw new RuntimeIOException(e);

         }

     }

 }