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Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang. The code is tested using the latest revision of the JDK for supported LTS releases: 8, 11, 17 and 21 currently. See https://github.com/apache/commons-lang/blob/master/.github/workflows/maven.yml Please ensure your build environment is up-to-date and kindly report any build issues.

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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.commons.lang3.tuple;

/**
 * A mutable pair consisting of two {@code Object} elements.
 *
 * Not #ThreadSafe#
 *
 * @param  the left element type
 * @param  the right element type
 *
 * @since Lang 3.0
 */
public class MutablePair extends Pair {

    /** Serialization version */
    private static final long serialVersionUID = 4954918890077093841L;

    /** Left object */
    public L left;
    /** Right object */
    public R right;

    /**
     * Obtains an immutable pair of from two objects inferring the generic types.
     *
     * This factory allows the pair to be created using inference to
     * obtain the generic types.
     *
     * @param  the left element type
     * @param  the right element type
     * @param left  the left element, may be null
     * @param right  the right element, may be null
     * @return a pair formed from the two parameters, not null
     */
    public static  MutablePair of(final L left, final R right) {
        return new MutablePair<>(left, right);
    }

    /**
     * Create a new pair instance of two nulls.
     */
    public MutablePair() {
        super();
    }

    /**
     * Create a new pair instance.
     *
     * @param left  the left value, may be null
     * @param right  the right value, may be null
     */
    public MutablePair(final L left, final R right) {
        super();
        this.left = left;
        this.right = right;
    }

    //-----------------------------------------------------------------------
    /**
     * {@inheritDoc}
     */
    @Override
    public L getLeft() {
        return left;
    }

    /**
     * Sets the left element of the pair.
     *
     * @param left  the new value of the left element, may be null
     */
    public void setLeft(final L left) {
        this.left = left;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public R getRight() {
        return right;
    }

    /**
     * Sets the right element of the pair.
     *
     * @param right  the new value of the right element, may be null
     */
    public void setRight(final R right) {
        this.right = right;
    }

    /**
     * Sets the {@code Map.Entry} value.
     * This sets the right element of the pair.
     *
     * @param value  the right value to set, not null
     * @return the old value for the right element
     */
    @Override
    public R setValue(final R value) {
        final R result = getRight();
        setRight(value);
        return result;
    }

}