org.gradoop.flink.algorithms.fsm.transactional.tle.functions.ToFSMGraph.java Source code

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Here is the source code for org.gradoop.flink.algorithms.fsm.transactional.tle.functions.ToFSMGraph.java

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/**
 * Copyright  2014 - 2018 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.algorithms.fsm.transactional.tle.functions;

import com.google.common.collect.Maps;
import org.gradoop.common.model.impl.id.GradoopId;
import org.gradoop.common.model.impl.pojo.Edge;
import org.gradoop.common.model.impl.pojo.Vertex;
import org.gradoop.flink.algorithms.fsm.transactional.tle.pojos.FSMEdge;
import org.gradoop.flink.model.impl.layouts.transactional.tuples.GraphTransaction;

import java.util.Map;

/**
 * Superclass of map functions mapping a graph transaction to a FSM-fitted
 * graph format.
 */
public abstract class ToFSMGraph {

    /**
     * Transforms a graph's vertices.
     *
     * @param graph graph
     * @param vertexIdMap mapping of Gradoop ids to integers
     * @return vertices represented by a integer-label map
     */
    protected Map<Integer, String> transformVertices(GraphTransaction graph, Map<GradoopId, Integer> vertexIdMap) {

        Map<Integer, String> fsmVertices = Maps.newHashMapWithExpectedSize(graph.getVertices().size());

        int vertexId = 0;
        for (Vertex vertex : graph.getVertices()) {
            vertexIdMap.put(vertex.getId(), vertexId);
            fsmVertices.put(vertexId, vertex.getLabel());
            vertexId++;
        }
        return fsmVertices;
    }

    /**
     * Transforms a graph's edges.
     *
     * @param graph graph
     * @param vertexIdMap mapping of Gradoop ids to integers
     * @return id-edge map
     */
    protected Map<Integer, FSMEdge> transformEdges(GraphTransaction graph, Map<GradoopId, Integer> vertexIdMap) {
        Map<Integer, FSMEdge> fsmEdges = Maps.newHashMapWithExpectedSize(graph.getEdges().size());

        int edgeId = 0;
        for (Edge edge : graph.getEdges()) {

            int sourceId = vertexIdMap.get(edge.getSourceId());
            int targetId = vertexIdMap.get(edge.getTargetId());

            fsmEdges.put(edgeId, new FSMEdge(sourceId, edge.getLabel(), targetId));

            edgeId++;
        }
        return fsmEdges;
    }
}