/**
* 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 org.apache.commons.lang.StringUtils;
import org.jumpmind.db.platform.IDatabasePlatform;
import org.jumpmind.extension.IBuiltInExtensionPoint;
import org.jumpmind.symmetric.io.data.DataContext;
public class BinaryLeftColumnTransform implements ISingleValueColumnTransform, IBuiltInExtensionPoint {
public static final String NAME = "bleft";
public String getName() {
return NAME;
}
public boolean isExtractColumnTransform() {
return true;
}
public boolean isLoadColumnTransform() {
return true;
}
public String transform(IDatabasePlatform platform, DataContext context,
TransformColumn column, TransformedData data, Map<String, String> sourceValues,
String newValue, String oldValue) throws IgnoreColumnException, IgnoreRowException {
if (StringUtils.isNotBlank(newValue)) {
String expression = column.getTransformExpression();
if (StringUtils.isNotBlank(expression)) {
expression = expression.trim();
return bleft(newValue, Integer.parseInt(expression));
}
}
return newValue;
}
public String bleft(String value, int maxBytes) {
StringBuilder ret = new StringBuilder();
for(int i = 0;i < value.length(); i++) {
if((maxBytes -= value.substring(i, i+1).getBytes().length) < 0) break;
ret.append(value.charAt(i));
}
return ret.toString();
}
}