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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
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 * Unless required by applicable law or agreed to in writing, software
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package org.apache.commons.lang3.tuple;

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

import org.apache.commons.lang3.builder.CompareToBuilder;

/**
 * A triple consisting of three elements.
 *
 * 

This class is an abstract implementation defining the basic API. * It refers to the elements as 'left', 'middle' and 'right'.

* *

Subclass implementations may be mutable or immutable. * However, there is no restriction on the type of the stored objects that may be stored. * If mutable objects are stored in the triple, then the triple itself effectively becomes mutable.

* * @param the left element type * @param the middle element type * @param the right element type * * @since 3.2 */ public abstract class Triple implements Comparable>, Serializable { /** Serialization version */ private static final long serialVersionUID = 1L; /** * An empty array. *

* Consider using {@link #emptyArray()} to avoid generics warnings. *

* * @since 3.10. */ public static final Triple[] EMPTY_ARRAY = {}; /** * 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 Triple[] emptyArray() { return (Triple[]) EMPTY_ARRAY; } /** * Obtains an immutable 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 Triple of(final L left, final M middle, final R right) { return ImmutableTriple.of(left, middle, right); } /** * Obtains an immutable triple of three non-null 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 not be null * @param middle the middle element, may not be null * @param right the right element, may not be null * @return a triple formed from the three parameters, not null * @throws NullPointerException if any input is null * @since 3.13.0 */ public static Triple ofNonNull(final L left, final M middle, final R right) { return ImmutableTriple.ofNonNull(left, middle, right); } /** * Compares the triple based on the left element, followed by the middle element, * finally the right element. * The types must be {@link Comparable}. * * @param other the other triple, not null * @return negative if this is less, zero if equal, positive if greater */ @Override public int compareTo(final Triple other) { return new CompareToBuilder().append(getLeft(), other.getLeft()) .append(getMiddle(), other.getMiddle()) .append(getRight(), other.getRight()).toComparison(); } /** * Compares this triple to another based on the three elements. * * @param obj the object to compare to, null returns false * @return true if the elements of the triple are equal */ @Override public boolean equals(final Object obj) { if (obj == this) { return true; } if (obj instanceof Triple) { final Triple other = (Triple) obj; return Objects.equals(getLeft(), other.getLeft()) && Objects.equals(getMiddle(), other.getMiddle()) && Objects.equals(getRight(), other.getRight()); } return false; } /** * Gets the left element from this triple. * * @return the left element, may be null */ public abstract L getLeft(); /** * Gets the middle element from this triple. * * @return the middle element, may be null */ public abstract M getMiddle(); /** * Gets the right element from this triple. * * @return the right element, may be null */ public abstract R getRight(); /** * Returns a suitable hash code. * * @return the hash code */ @Override public int hashCode() { return Objects.hashCode(getLeft()) ^ Objects.hashCode(getMiddle()) ^ Objects.hashCode(getRight()); } /** * Returns a String representation of this triple using the format {@code ($left,$middle,$right)}. * * @return a string describing this object, not null */ @Override public String toString() { return "(" + getLeft() + "," + getMiddle() + "," + getRight() + ")"; } /** * Formats the receiver using the given format. * *

This uses {@link java.util.Formattable} to perform the formatting. Three variables may * be used to embed the left and right elements. Use {@code %1$s} for the left * element, {@code %2$s} for the middle and {@code %3$s} for the right element. * The default format used by {@code toString()} is {@code (%1$s,%2$s,%3$s)}.

* * @param format the format string, optionally containing {@code %1$s}, {@code %2$s} and {@code %3$s}, not null * @return the formatted string, not null */ public String toString(final String format) { return String.format(format, getLeft(), getMiddle(), getRight()); } }




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