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Java example source code file (

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Java - Java tags/keywords

immutablepair, override, unsupportedoperationexception

The Java example source code

 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.commons.lang3.tuple;

 * <p>An immutable pair consisting of two {@code Object} elements.

* * <p>Although the implementation is immutable, there is no restriction on the objects * that may be stored. If mutable objects are stored in the pair, then the pair * itself effectively becomes mutable. The class is also {@code final}, so a subclass * can not add undesirable behaviour.</p> * * <p>#ThreadSafe# if both paired objects are thread-safe

* * @param <L> the left element type * @param <R> the right element type * * @since Lang 3.0 */ public final class ImmutablePair<L, R> extends Pair { /** Serialization version */ private static final long serialVersionUID = 4954918890077093841L; /** Left object */ public final L left; /** Right object */ public final R right; /** * <p>Obtains an immutable pair of from two objects inferring the generic types.

* * <p>This factory allows the pair to be created using inference to * obtain the generic types.</p> * * @param <L> the left element type * @param <R> 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 <L, R> ImmutablePair of(final L left, final R right) { return new ImmutablePair<L, R>(left, right); } /** * Create a new pair instance. * * @param left the left value, may be null * @param right the right value, may be null */ public ImmutablePair(final L left, final R right) { super(); this.left = left; this.right = right; } //----------------------------------------------------------------------- /** * {@inheritDoc} */ @Override public L getLeft() { return left; } /** * {@inheritDoc} */ @Override public R getRight() { return right; } /** * <p>Throws {@code UnsupportedOperationException}.

* * <p>This pair is immutable, so this operation is not supported.

* * @param value the value to set * @return never * @throws UnsupportedOperationException as this operation is not supported */ @Override public R setValue(final R value) { throw new UnsupportedOperationException(); } }

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