/*
* 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.graph.utils;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.java.functions.FunctionAnnotation.ForwardedFields;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.graph.Edge;
import org.apache.flink.types.NullValue;
/**
* Create an Edge from a Tuple2.
*
* The new edge's value is set to {@link NullValue}.
*
* @param <K> edge ID type
*/
@ForwardedFields("f0; f1")
public class Tuple2ToEdgeMap<K> implements MapFunction<Tuple2<K, K>, Edge<K, NullValue>> {
private static final long serialVersionUID = 1L;
private Edge<K, NullValue> edge = new Edge<>(null, null, NullValue.getInstance());
@Override
public Edge<K, NullValue> map(Tuple2<K, K> tuple) {
edge.f0 = tuple.f0;
edge.f1 = tuple.f1;
return edge;
}
}