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Wayang implementation of the operators to be working with the platform "Apache Giraph"

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/*
 * 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.wayang.giraph.mappings;

import org.apache.wayang.basic.operators.PageRankOperator;
import org.apache.wayang.core.mapping.*;
import org.apache.wayang.core.plan.wayangplan.Operator;
import org.apache.wayang.core.plan.wayangplan.Subplan;
import org.apache.wayang.giraph.operators.GiraphPageRankOperator;
import org.apache.wayang.giraph.platform.GiraphPlatform;

import java.util.Collection;
import java.util.Collections;

/**
 * Maps {@link PageRankOperator}s to {@link GiraphPageRankOperator}s.
 */
public class PageRankMapping implements Mapping {

    @Override
    public Collection getTransformations() {
        return Collections.singleton(
                new PlanTransformation(
                        this.createSubplanPattern(),
                        this.createReplacementSubplanFactory(),
                        GiraphPlatform.getInstance()
                )
        );
    }

    @SuppressWarnings("unchecked")
    private SubplanPattern createSubplanPattern() {
        final OperatorPattern operatorPattern = new OperatorPattern(
                "pageRank", new PageRankOperator(1), false);
        return SubplanPattern.createSingleton(operatorPattern);
    }

    private ReplacementSubplanFactory createReplacementSubplanFactory() {
        return new ReplacementSubplanFactory.OfSingleOperators(
                (matchedOperator, epoch) -> new GiraphPageRankOperator(matchedOperator).at(epoch)
        );
    }
}