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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 triple consisting of three {@code Object} elements.
 *
 * Not #ThreadSafe#
 *
 * @param  the left element type
 * @param  the middle element type
 * @param  the right element type
 *
 * @since 3.2
 */
public class MutableTriple extends Triple {

    /**
     * The empty array singleton.
     * 
     * Consider using {@link #emptyArray()} to avoid generics warnings.
     * 
     *
     * @since 3.10.
     */
    public static final MutableTriple[] EMPTY_ARRAY = new MutableTriple[0];

    /** Serialization version */
    private static final long serialVersionUID = 1L;

    /**
     * Returns the empty array singleton that can be assigned without compiler warning.
     *
     * @param  the left element type
     * @param  the middle element type
     * @param  the right element type
     * @return the empty array singleton that can be assigned without compiler warning.
     *
     * @since 3.10.
     */
    @SuppressWarnings("unchecked")
    public static  MutableTriple[] emptyArray() {
        return (MutableTriple[]) EMPTY_ARRAY;
    }

    /**
     * Obtains a mutable triple of three objects inferring the generic types.
     *
     * This factory allows the triple to be created using inference to
     * obtain the generic types.
     *
     * @param  the left element type
     * @param  the middle element type
     * @param  the right element type
     * @param left  the left element, may be null
     * @param middle  the middle element, may be null
     * @param right  the right element, may be null
     * @return a triple formed from the three parameters, not null
     */
    public static  MutableTriple of(final L left, final M middle, final R right) {
        return new MutableTriple<>(left, middle, right);
    }
    /** Left object */
    public L left;
    /** Middle object */
    public M middle;

    /** Right object */
    public R right;

    /**
     * Create a new triple instance of three nulls.
     */
    public MutableTriple() {
        super();
    }

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

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

    /**
     * {@inheritDoc}
     */
    @Override
    public M getMiddle() {
        return middle;
    }

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

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

    /**
     * Sets the middle element of the triple.
     *
     * @param middle  the new value of the middle element, may be null
     */
    public void setMiddle(final M middle) {
        this.middle = middle;
    }

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