NodeMatcher.java example

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spork-streaming-master
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 * to you under the Apache License, Version 2.0 (the
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 *
 *     http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.pig.test.utils.dotGraph;

import org.apache.pig.impl.plan.OperatorKey;
import org.apache.pig.impl.plan.OperatorPlan;
import org.apache.pig.impl.plan.Operator;

import java.util.Map;

/***
 * This is a common interface for graph vertex mapping logic.
 * Though I call it Matcher so that people don't get confused
 * with mapper in MapReduce.
 */

public interface NodeMatcher<E extends Operator,
                             P extends OperatorPlan<E>> {

    /***
     * This method does matching between vertices in two
     * given plans.
     *
     * @param plan1
     * @param plan2
     * @param messages
     * @return The output map: plan1Key -> plan2Key
     */
    Map<OperatorKey, OperatorKey> match(P plan1,
                                        P plan2,
                                        StringBuilder messages) ;
}