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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.dinky.shaded.paimon.utils;

import java.io.Serializable;
import java.util.Map;
import java.util.Objects;

/** Pair contains left and right. */
public final class Pair implements Map.Entry, Serializable {

    private static final long serialVersionUID = 1L;

    /** Left object. */
    private L left;

    /** Right object. */
    private R right;

    public static  Pair of(L left, R right) {
        return new Pair<>(left, right);
    }

    private Pair(final L left, final R right) {
        this.left = left;
        this.right = right;
    }

    public L getLeft() {
        return left;
    }

    public R getRight() {
        return right;
    }

    public void setLeft(L left) {
        this.left = left;
    }

    public R setRight(R right) {
        R previous = this.right;
        this.right = right;
        return previous;
    }

    @Override
    public L getKey() {
        return getLeft();
    }

    @Override
    public R getValue() {
        return getRight();
    }

    @Override
    public R setValue(R value) {
        return setRight(value);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        Pair pair = (Pair) o;
        return Objects.equals(left, pair.left) && Objects.equals(right, pair.right);
    }

    @Override
    public int hashCode() {
        return Objects.hash(left, right);
    }

    @Override
    public String toString() {
        return "(" + getLeft() + ',' + getRight() + ')';
    }
}