/*******************************************************************************
* Copyright 2017 Capital One Services, LLC and Bitwise, Inc.
* Licensed 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 hydrograph.engine.transformation.userfunctions.transform;
import hydrograph.engine.transformation.userfunctions.base.ReusableRow;
import hydrograph.engine.transformation.userfunctions.base.TransformBase;
import java.util.ArrayList;
import java.util.Properties;
import static hydrograph.engine.transformation.standardfunctions.NumericFunctions.getDoubleFromComparable;
/**
* The Class LibSVMFormat.
*
* @author Bitwise
*
*/
public class LibSVMFormat implements TransformBase{
@Override
public void prepare(Properties props, ArrayList<String> inputFields, ArrayList<String> outputFields) {
}
@Override
public void transform(ReusableRow inputRow, ReusableRow outputRow) {
String svmRecord="";
String label=getDoubleFromComparable(inputRow.getField(0)).toString();
for(int i=1;i<inputRow.getFields().size();i++){
svmRecord=svmRecord + i + ":" + getDoubleFromComparable(inputRow.getField(i)) + " ";
}
svmRecord=svmRecord.substring(0,svmRecord.length()-1);
svmRecord=label + " " + svmRecord;
outputRow.setField(0, svmRecord);
}
@Override
public void cleanup() {
}
}