package org.apache.maven.scm.command.diff;

 /*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  * http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

  * KIND, either express or implied.  See the License for the

  * specific language governing permissions and limitations

  * under the License.

  */

 import org.apache.maven.scm.CommandParameter;

 import org.apache.maven.scm.CommandParameters;

 import org.apache.maven.scm.ScmException;

 import org.apache.maven.scm.ScmFileSet;

 import org.apache.maven.scm.ScmResult;

 import org.apache.maven.scm.ScmVersion;

 import org.apache.maven.scm.command.AbstractCommand;

 import org.apache.maven.scm.provider.ScmProviderRepository;

 /**

  * TODO: Better support for entire filesets.

  * TODO: Better support for entire changesets (ie consistency between revision handling in CVS and SVN).

  * TODO: Consistent handling of revisions, tags and dates - currently only revisions supported, though tags will work for CVS

  *

  * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>

  * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>

  * @author <a href="mailto:brett@apache.org">Brett Porter</a>

  * @version $Id: AbstractDiffCommand.java 685539 2008-08-13 13:27:27Z vsiveton $

  */

 public abstract class AbstractDiffCommand

     extends AbstractCommand

 {

     protected abstract DiffScmResult executeDiffCommand( ScmProviderRepository repository, ScmFileSet fileSet,

                                                          ScmVersion startRevision, ScmVersion endRevision )

         throws ScmException;

     /** {@inheritDoc} */

     public ScmResult executeCommand( ScmProviderRepository repository, ScmFileSet fileSet,

                                      CommandParameters parameters )

         throws ScmException

     {

         ScmVersion startRevision = parameters.getScmVersion( CommandParameter.START_SCM_VERSION, null );

         ScmVersion endRevision = parameters.getScmVersion( CommandParameter.END_SCM_VERSION, null );

         return executeDiffCommand( repository, fileSet, startRevision, endRevision );

     }

 }