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https://issues.apache.org/jira/browse/LANG-675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13091671#comment-13091671
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Henri Yandell commented on LANG-675:
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What's a Triplet a common need for?
> Add Triplet class (similar to Pair)
> -----------------------------------
>
> Key: LANG-675
> URL: https://issues.apache.org/jira/browse/LANG-675
> Project: Commons Lang
> Issue Type: New Feature
> Components: lang.*
> Reporter: Axel Fontaine
> Fix For: 3.x
>
>
> Similar to Pair, a Triplet is a common need.
> Here is an adaptation of the commons-lang Pair that also takes a middle
> argument:
> import java.io.Serializable;
> import org.apache.commons.lang.ObjectUtils;
> import org.apache.commons.lang.builder.HashCodeBuilder;
> /**
> * Similar to Pair, using 3 instead of 2 Objects.
> *
> * @param <L>
> * The "left" object of the triplet.
> * @param <M>
> * The "middle" object of the triplet.
> * @param <R>
> * The "right" object of the triplet.
> */
> public final class Triplet<L, M, R> implements Serializable {
> /** Serialization version */
> private static final long serialVersionUID = -8359217847916721612L;
> /**
> * Static fluent creation method for a Pair<L, R>: <code>Pair.of(left,
> right)</code>
> *
> * @param <L>
> * The "left" object of the triplet.
> * @param <M>
> * The "middle" object of the triplet.
> * @param <R>
> * The "right" object of the triplet.
> *
> * @param left
> * The "left" object of the triplet.
> * @param middle
> * The "middle" object of the triplet.
> * @param right
> * The "right" object of the triplet.
> *
> * @return The newly created triplet.
> */
> public static <L, M, R> Triplet<L, M, R> of(final L left, final M middle,
> final R right) {
> return new Triplet<L, M, R>(left, middle, right);
> }
> /** Left object */
> public final L left;
> /** Middle object */
> public final M middle;
> /** Right object */
> public final R right;
> /**
> * Create a new Triplet instance
> *
> * @param left
> * the left object
> * @param middle
> * The "middle" object of the triplet.
> * @param right
> * the right object
> */
> public Triplet(final L left, final M middle, final R right) {
> this.left = left;
> this.middle = middle;
> this.right = right;
> }
> /**
> * {@inheritDoc}
> *
> * @see java.lang.Object#equals(java.lang.Object)
> */
> @Override
> public boolean equals(final Object obj) {
> if (obj == this) {
> return true;
> }
> if (obj instanceof Triplet<?, ?, ?> == false) {
> return false;
> }
> final Triplet<?, ?, ?> other = (Triplet<?, ?, ?>) obj;
> return ObjectUtils.equals(this.left, other.left) &&
> ObjectUtils.equals(this.middle, other.middle)
> && ObjectUtils.equals(this.right, other.right);
> }
> /**
> * {@inheritDoc}
> *
> * @see java.lang.Object#hashCode()
> */
> @Override
> public int hashCode() {
> return new
> HashCodeBuilder().append(this.left).append(this.middle).append(this.right).toHashCode();
> }
> /**
> * Returns a String representation of the Pair in the form: (L,R)
> *
> * {@inheritDoc}
> *
> * @see java.lang.Object#toString()
> */
> @Override
> public String toString() {
> return new
> StringBuilder().append("(").append(this.left).append(",").append(this.middle).append(",")
> .append(this.right).append(")").toString();
> }
> Feel free to use it if you wish to include it.
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