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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.flink.graph.asm.result;

import org.apache.flink.graph.asm.translate.TranslateFunction;
import org.apache.flink.util.Collector;

/**
 * Base class for algorithm results for a pair of vertices.
 *
 * @param  graph ID type
 */
public abstract class BinaryResultBase extends ResultBase
        implements BinaryResult, TranslatableResult {

    private K vertexId0;

    private K vertexId1;

    @Override
    public K getVertexId0() {
        return vertexId0;
    }

    @Override
    public void setVertexId0(K vertexId0) {
        this.vertexId0 = vertexId0;
    }

    @Override
    public K getVertexId1() {
        return vertexId1;
    }

    @Override
    public void setVertexId1(K vertexId1) {
        this.vertexId1 = vertexId1;
    }

    @Override
    public  TranslatableResult translate(
            TranslateFunction translator,
            TranslatableResult reuse,
            Collector> out)
            throws Exception {
        if (reuse == null) {
            reuse = new BasicBinaryResult<>();
        }

        K vertexId0 = this.getVertexId0();
        K vertexId1 = this.getVertexId1();

        BinaryResult translatable = (BinaryResult) reuse;
        BinaryResult translated = (BinaryResult) this;

        translated.setVertexId0(
                translator.translate(this.getVertexId0(), translatable.getVertexId0()));
        translated.setVertexId1(
                translator.translate(this.getVertexId1(), translatable.getVertexId1()));

        out.collect((TranslatableResult) translated);

        this.setVertexId0(vertexId0);
        this.setVertexId1(vertexId1);

        return reuse;
    }

    /**
     * Simple override of {@code BinaryResultBase}. This holds no additional values but is used by
     * {@link BinaryResultBase#translate} as the reuse object for translating vertex IDs.
     *
     * @param  result ID type
     */
    private static class BasicBinaryResult extends BinaryResultBase {
        @Override
        public String toString() {
            return "(" + getVertexId0() + "," + getVertexId1() + ")";
        }
    }
}