/**
 * Licensed to JumpMind Inc under one or more contributor
 * license agreements.  See the NOTICE file distributed
 * with this work for additional information regarding
 * copyright ownership.  JumpMind Inc licenses this file
 * to you under the GNU General Public License, version 3.0 (GPLv3)
 * (the "License"); you may not use this file except in compliance
 * with the License.
 *
 * You should have received a copy of the GNU General Public License,
 * version 3.0 (GPLv3) along with this library; if not, see
 * <http://www.gnu.org/licenses/>.
 *
 * 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.jumpmind.symmetric.io.data.transform;

import java.util.Map;
import java.util.StringTokenizer;

import org.jumpmind.db.platform.IDatabasePlatform;
import org.jumpmind.extension.IBuiltInExtensionPoint;
import org.jumpmind.symmetric.io.data.DataContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ValueMapColumnTransform implements ISingleValueColumnTransform, IBuiltInExtensionPoint {

	protected final Logger log = LoggerFactory.getLogger(getClass());

	public static final String NAME = "valueMap";

	public String getName() {
		return NAME;
	}

	public boolean isExtractColumnTransform() {
		return true;
	}

	public boolean isLoadColumnTransform() {
		return true;
	}

	private static String getValue(String value,String expression) {
		if (expression==null) {
			return null;
		}
		
		StringTokenizer tokens = new StringTokenizer(expression);
		String defaultValue = null;

		while (tokens.hasMoreElements()) {
			String keyValue = (String) tokens.nextElement();
			int equalIndex = keyValue.indexOf("=");
			if (equalIndex != -1) {
				if (keyValue.substring(0, equalIndex).equals(value)) {
					return keyValue.substring(equalIndex+1);
				} else if (keyValue.substring(0, equalIndex).equals("*")) {
				    String targetValue = keyValue.substring(equalIndex+1);
				    if (targetValue.equals("*")) {
				        defaultValue = value;
				    } else {
				        defaultValue = targetValue;
				    }
				}
			}
		}
		return defaultValue;
	}

	public String transform(IDatabasePlatform platform, DataContext context, TransformColumn column,
			TransformedData data, Map<String, String> sourceValues, String newValue, String oldValue)
			throws IgnoreColumnException, IgnoreRowException {
		return getValue(newValue,column.getTransformExpression());

	}
}