/*
* 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.flink.streaming.api.functions.windowing.delta.extractor;
import org.apache.flink.annotation.Internal;
import org.apache.flink.api.java.tuple.Tuple;
/**
* Extracts one or more fields of the type Double from a tuple and puts them into a new double[].
*/
@Internal
public class FieldsFromTuple implements Extractor<Tuple, double[]> {
private static final long serialVersionUID = -2554079091050273761L;
int[] indexes;
/**
* Extracts one or more fields of the the type Double from a tuple and puts
* them into a new double[] (in the specified order).
*
* @param indexes
* The indexes of the fields to be extracted.
*/
public FieldsFromTuple(int... indexes) {
this.indexes = indexes;
}
@Override
public double[] extract(Tuple in) {
double[] out = new double[indexes.length];
for (int i = 0; i < indexes.length; i++) {
out[i] = (Double) in.getField(indexes[i]);
}
return out;
}
}