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MathColumnTransform.java
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MathColumnTransform.java
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/**
* 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.jumpmind.db.platform.IDatabasePlatform;
import org.jumpmind.extension.IBuiltInExtensionPoint;
import org.jumpmind.symmetric.io.data.DataContext;
import net.sourceforge.jeval.EvaluationException;
import net.sourceforge.jeval.Evaluator;
public class MathColumnTransform implements ISingleNewAndOldValueColumnTransform, IBuiltInExtensionPoint {
public final static String NAME = "math";
private static Evaluator eval = new Evaluator();
public String getName() {
return NAME;
}
public boolean isExtractColumnTransform() {
return true;
}
public boolean isLoadColumnTransform() {
return true;
}
public NewAndOldValue transform(IDatabasePlatform platform,
DataContext context,
TransformColumn column, TransformedData data, Map<String, String> sourceValues,
String newValue, String oldValue) throws IgnoreColumnException, IgnoreRowException {
String transformExpression = column.getTransformExpression();
try {
eval.clearVariables();
eval.putVariable("currentValue", newValue);
eval.putVariable("oldValue", oldValue);
eval.putVariable("channelId", context.getBatch().getChannelId());
for (String columnName : sourceValues.keySet()) {
eval.putVariable(columnName.toUpperCase(), sourceValues.get(columnName));
eval.putVariable(columnName, sourceValues.get(columnName));
}
// JEval always returns a double with at least one decimal place.
// Truncate the decimal place if not needed so the number can be inserted into an integer column.
String result = eval.evaluate(transformExpression);
Double dblResult = Double.valueOf(result);
if (dblResult == Math.floor(dblResult)) {
result = result.substring(0, result.length()-2);
}
return new NewAndOldValue(column, data, result);
} catch (EvaluationException e) {
throw new RuntimeException("Unable to evaluate transform expression: " + transformExpression);
}
}
}