/*
 * 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.tuscany.das.rdb.impl;

import java.sql.Connection;

import org.apache.log4j.Logger;
import org.apache.tuscany.das.rdb.config.wrapper.MappingWrapper;

import commonj.sdo.DataObject;

/**
 * 
 */
public class ApplyChangesCommandImpl extends BaseCommandImpl {

    private final Logger logger = Logger.getLogger(ApplyChangesCommandImpl.class);

    private ChangeSummarizer summarizer = new ChangeSummarizer();

    public ApplyChangesCommandImpl(MappingWrapper config, Connection connection) {
        this.configWrapper = config;
        if (connection != null) {
            setConnection(connection, config.getConfig());
        }

    }

    public void setConnection(ConnectionImpl connection) {
        summarizer.setConnection(connection);
    }

    public void execute(DataObject root) {
        if (this.logger.isDebugEnabled()) {
            this.logger.debug("Executing ApplyChangesCmd");
        }

        if (summarizer.getConnection() == null) {
            throw new RuntimeException("A connection must be provided");
        }

        if (!root.equals(root.getDataGraph().getRootObject())) {
            throw new RuntimeException("'root' argument must be the root of the datagraph");
        }

        summarizer.setMapping(configWrapper);

        Changes changes = summarizer.loadChanges(root);

        boolean success = false;
        try {
            changes.execute();
            success = true;
        } finally {
            if (success) {
                summarizer.getConnection().cleanUp();
            } else {
                summarizer.getConnection().errorCleanUp();
            }
        }
    }

}