io.micronaut.openapi.visitor.Pair Maven / Gradle / Ivy

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/*
 * Copyright 2017-2023 original authors
 *
 * Licensed 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
 *
 * https://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 io.micronaut.openapi.visitor;

import java.util.Objects;

/**
 * Helper class for handling two values.
 *
 * @param  first object
 * @param  second object
 */
public final class Pair {

    public static final Pair NULL_STRING_PAIR = Pair.of(null, null);

    private final S first;
    private final T second;

    private Pair(S first, T second) {
        this.first = first;
        this.second = second;
    }

    public static  Pair of(S first, T second) {
        return new Pair<>(first, second);
    }

    public S getFirst() {
        return first;
    }

    public T getSecond() {
        return second;
    }

    @Override
    public boolean equals(Object o) {

        if (this == o) {
            return true;
        }

        if (!(o instanceof Pair pair)) {
            return false;
        }

        if (!Objects.equals(first, pair.first)) {
            return false;
        }

        return Objects.equals(second, pair.second);
    }

    @Override
    public int hashCode() {
        int result = first != null ? first.hashCode() : 0;
        result = 31 * result + (second != null ? second.hashCode() : 0);
        return result;
    }

    @Override
    public String toString() {
        return first + "->" + second;
    }
}