/*
 * 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);
        }
    }
}
