org.apache.apex.malhar.lib.utils.serde.PairSerde.java Source code

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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.apex.malhar.lib.utils.serde;

import javax.validation.constraints.NotNull;

import org.apache.commons.lang3.tuple.ImmutablePair;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.hadoop.classification.InterfaceStability;

import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import com.google.common.base.Preconditions;

/**
 * This is an implementation of {@link Serde} which serializes and deserializes pairs.
 *
 * @since 3.6.0
 */
@InterfaceStability.Evolving
public class PairSerde<T1, T2> implements Serde<Pair<T1, T2>> {
    @NotNull
    private Serde<T1> serde1;
    @NotNull
    private Serde<T2> serde2;

    private PairSerde() {
        // for Kryo
    }

    /**
     * Creates a {@link PairSerde}.
     * @param serde1 The {@link Serde} that is used to serialize and deserialize first element of a pair
     * @param serde2 The {@link Serde} that is used to serialize and deserialize second element of a pair
     */
    public PairSerde(@NotNull Serde<T1> serde1, @NotNull Serde<T2> serde2) {
        this.serde1 = Preconditions.checkNotNull(serde1);
        this.serde2 = Preconditions.checkNotNull(serde2);
    }

    @Override
    public void serialize(Pair<T1, T2> pair, Output output) {
        serde1.serialize(pair.getLeft(), output);
        serde2.serialize(pair.getRight(), output);
    }

    @Override
    public Pair<T1, T2> deserialize(Input input) {
        T1 first = serde1.deserialize(input);
        T2 second = serde2.deserialize(input);
        return new ImmutablePair<>(first, second);
    }

}