/*
    * 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.
   */
  package org.apache.maven.scm.command;
  
  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.provider.ScmProviderRepository;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
   * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
   *
   */
  public abstract class AbstractCommand implements Command {
      protected Logger logger = LoggerFactory.getLogger(getClass());
  
      protected abstract ScmResult executeCommand(
              ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters) throws ScmException;
  
      /** {@inheritDoc} */
      public final ScmResult execute(ScmProviderRepository repository, ScmFileSet fileSet, CommandParameters parameters)
              throws ScmException {
          if (repository == null) {
              throw new NullPointerException("repository cannot be null");
          }
  
          if (fileSet == null) {
              throw new NullPointerException("fileSet cannot be null");
          }
  
          try {
              return executeCommand(repository, fileSet, parameters);
          } catch (Exception ex) {
              throw new ScmException("Exception while executing SCM command.", ex);
          }
      }
  }