AddToGraphBroadcast.java
/*
* Copyright © 2014 - 2021 Leipzig University (Database Research Group)
*
* 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 org.gradoop.flink.model.impl.functions.graphcontainment;
import org.apache.flink.api.common.functions.RichMapFunction;
import org.apache.flink.api.java.functions.FunctionAnnotation;
import org.apache.flink.configuration.Configuration;
import org.gradoop.common.model.impl.pojo.EPGMGraphElement;
import org.gradoop.common.model.impl.id.GradoopId;
/**
* Adds the given graph head identifier to the graph element. The identifier
* is transferred via broadcasting.
*
* @param <GE> EPGM graph element type
*/
@FunctionAnnotation.ForwardedFields("id;label;properties")
public class AddToGraphBroadcast
<GE extends EPGMGraphElement>
extends RichMapFunction<GE, GE> {
/**
* constant string for "graph id"
*/
public static final String GRAPH_ID = "graphId";
/**
* Graph head identifier which gets added to the graph element.
*/
private GradoopId graphId;
@Override
public void open(Configuration parameters) throws Exception {
super.open(parameters);
graphId = getRuntimeContext()
.<GradoopId>getBroadcastVariable(GRAPH_ID).get(0);
}
@Override
public GE map(GE graphElement) throws Exception {
graphElement.addGraphId(graphId);
return graphElement;
}
}