author | weijun |
Wed, 06 Dec 2017 21:17:19 +0800 | |
changeset 49774 | 5950773b665c |
parent 48328 | 7acf5700d542 |
child 49823 | af4b57a556be |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.util; |
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|
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import java.util.function.IntConsumer; |
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import java.util.function.IntSupplier; |
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import java.util.function.Supplier; |
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import java.util.stream.IntStream; |
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|
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/** |
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* A container object which may or may not contain an {@code int} value. |
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* If a value is present, {@code isPresent()} returns {@code true}. If no |
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* value is present, the object is considered <i>empty</i> and |
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* {@code isPresent()} returns {@code false}. |
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* |
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* <p>Additional methods that depend on the presence or absence of a contained |
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* value are provided, such as {@link #orElse(int) orElse()} |
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* (returns a default value if no value is present) and |
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* {@link #ifPresent(IntConsumer) ifPresent()} (performs an |
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* action if a value is present). |
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* |
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* <p>This is a <a href="../lang/doc-files/ValueBased.html">value-based</a> |
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* class; use of identity-sensitive operations (including reference equality |
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* ({@code ==}), identity hash code, or synchronization) on instances of |
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* {@code OptionalInt} may have unpredictable results and should be avoided. |
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* |
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* @apiNote |
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* {@code OptionalInt} is primarily intended for use as a method return type where |
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* there is a clear need to represent "no result." A variable whose type is |
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* {@code OptionalInt} should never itself be {@code null}; it should always point |
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* to an {@code OptionalInt} instance. |
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* |
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* @since 1.8 |
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*/ |
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public final class OptionalInt { |
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/** |
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* Common instance for {@code empty()}. |
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*/ |
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private static final OptionalInt EMPTY = new OptionalInt(); |
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/** |
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* If true then the value is present, otherwise indicates no value is present |
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*/ |
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private final boolean isPresent; |
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private final int value; |
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/** |
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* Construct an empty instance. |
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* |
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* @implNote Generally only one empty instance, {@link OptionalInt#EMPTY}, |
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* should exist per VM. |
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*/ |
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private OptionalInt() { |
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this.isPresent = false; |
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this.value = 0; |
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} |
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/** |
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* Returns an empty {@code OptionalInt} instance. No value is present for |
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* this {@code OptionalInt}. |
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* |
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* @apiNote |
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* Though it may be tempting to do so, avoid testing if an object is empty |
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* by comparing with {@code ==} against instances returned by |
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* {@code OptionalInt.empty()}. There is no guarantee that it is a singleton. |
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* Instead, use {@link #isPresent()}. |
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* |
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* @return an empty {@code OptionalInt} |
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*/ |
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public static OptionalInt empty() { |
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return EMPTY; |
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} |
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/** |
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* Construct an instance with the described value. |
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* |
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* @param value the int value to describe |
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*/ |
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private OptionalInt(int value) { |
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this.isPresent = true; |
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this.value = value; |
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} |
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/** |
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* Returns an {@code OptionalInt} describing the given value. |
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* |
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* @param value the value to describe |
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* @return an {@code OptionalInt} with the value present |
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*/ |
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public static OptionalInt of(int value) { |
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return new OptionalInt(value); |
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} |
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/** |
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* If a value is present, returns the value, otherwise throws |
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* {@code NoSuchElementException}. |
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* |
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* @apiNote |
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* The preferred alternative to this method is {@link #orElseThrow()}. |
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* @return the value described by this {@code OptionalInt} |
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* @throws NoSuchElementException if no value is present |
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*/ |
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public int getAsInt() { |
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if (!isPresent) { |
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throw new NoSuchElementException("No value present"); |
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} |
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return value; |
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} |
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/** |
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* If a value is present, returns {@code true}, otherwise {@code false}. |
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* |
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* @return {@code true} if a value is present, otherwise {@code false} |
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*/ |
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public boolean isPresent() { |
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return isPresent; |
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} |
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* If a value is present, performs the given action with the value, |
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* otherwise does nothing. |
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* |
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* @param action the action to be performed, if a value is present |
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* @throws NullPointerException if value is present and the given action is |
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* {@code null} |
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*/ |
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public void ifPresent(IntConsumer action) { |
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if (isPresent) { |
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action.accept(value); |
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} |
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} |
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/** |
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* If a value is present, performs the given action with the value, |
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* otherwise performs the given empty-based action. |
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* |
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* @param action the action to be performed, if a value is present |
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* @param emptyAction the empty-based action to be performed, if no value is |
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* present |
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* @throws NullPointerException if a value is present and the given action |
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* is {@code null}, or no value is present and the given empty-based |
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* action is {@code null}. |
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* @since 9 |
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*/ |
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public void ifPresentOrElse(IntConsumer action, Runnable emptyAction) { |
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if (isPresent) { |
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action.accept(value); |
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} else { |
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emptyAction.run(); |
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} |
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} |
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* If a value is present, returns a sequential {@link IntStream} containing |
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* only that value, otherwise returns an empty {@code IntStream}. |
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* |
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* @apiNote |
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* This method can be used to transform a {@code Stream} of optional |
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* integers to an {@code IntStream} of present integers: |
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* <pre>{@code |
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* Stream<OptionalInt> os = .. |
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* IntStream s = os.flatMapToInt(OptionalInt::stream) |
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* }</pre> |
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* |
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* @return the optional value as an {@code IntStream} |
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* @since 9 |
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*/ |
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public IntStream stream() { |
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if (isPresent) { |
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return IntStream.of(value); |
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} else { |
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return IntStream.empty(); |
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} |
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} |
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/** |
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* If a value is present, returns the value, otherwise returns |
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* {@code other}. |
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* |
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* @param other the value to be returned, if no value is present |
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* @return the value, if present, otherwise {@code other} |
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*/ |
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public int orElse(int other) { |
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return isPresent ? value : other; |
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} |
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/** |
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* If a value is present, returns the value, otherwise returns the result |
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* produced by the supplying function. |
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* |
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* @param supplier the supplying function that produces a value to be returned |
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* @return the value, if present, otherwise the result produced by the |
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* supplying function |
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* @throws NullPointerException if no value is present and the supplying |
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* function is {@code null} |
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*/ |
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public int orElseGet(IntSupplier supplier) { |
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return isPresent ? value : supplier.getAsInt(); |
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} |
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/** |
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* If a value is present, returns the value, otherwise throws |
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* {@code NoSuchElementException}. |
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* |
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* @return the value described by this {@code OptionalInt} |
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* @throws NoSuchElementException if no value is present |
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* @since 10 |
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*/ |
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public int orElseThrow() { |
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if (!isPresent) { |
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throw new NoSuchElementException("No value present"); |
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} |
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return value; |
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} |
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|
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/** |
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* If a value is present, returns the value, otherwise throws an exception |
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* produced by the exception supplying function. |
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* |
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* @apiNote |
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* A method reference to the exception constructor with an empty argument |
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* list can be used as the supplier. For example, |
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* {@code IllegalStateException::new} |
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* |
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* @param <X> Type of the exception to be thrown |
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* @param exceptionSupplier the supplying function that produces an |
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* exception to be thrown |
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* @return the value, if present |
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* @throws X if no value is present |
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* @throws NullPointerException if no value is present and the exception |
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* supplying function is {@code null} |
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*/ |
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public<X extends Throwable> int orElseThrow(Supplier<? extends X> exceptionSupplier) throws X { |
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if (isPresent) { |
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return value; |
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} else { |
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throw exceptionSupplier.get(); |
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} |
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} |
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|
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/** |
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* Indicates whether some other object is "equal to" this |
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* {@code OptionalInt}. The other object is considered equal if: |
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* <ul> |
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* <li>it is also an {@code OptionalInt} and; |
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* <li>both instances have no value present or; |
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* <li>the present values are "equal to" each other via {@code ==}. |
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* </ul> |
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* |
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* @param obj an object to be tested for equality |
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* @return {@code true} if the other object is "equal to" this object |
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* otherwise {@code false} |
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*/ |
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@Override |
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public boolean equals(Object obj) { |
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if (this == obj) { |
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return true; |
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} |
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|
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if (!(obj instanceof OptionalInt)) { |
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return false; |
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} |
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|
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OptionalInt other = (OptionalInt) obj; |
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return (isPresent && other.isPresent) |
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? value == other.value |
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: isPresent == other.isPresent; |
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} |
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|
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/** |
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* Returns the hash code of the value, if present, otherwise {@code 0} |
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* (zero) if no value is present. |
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* |
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* @return hash code value of the present value or {@code 0} if no value is |
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* present |
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*/ |
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@Override |
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public int hashCode() { |
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return isPresent ? Integer.hashCode(value) : 0; |
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} |
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|
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/** |
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* Returns a non-empty string representation of this {@code OptionalInt} |
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* suitable for debugging. The exact presentation format is unspecified and |
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* may vary between implementations and versions. |
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* |
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* @implSpec |
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* If a value is present the result must include its string representation |
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* in the result. Empty and present {@code OptionalInt}s must be |
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* unambiguously differentiable. |
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* |
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* @return the string representation of this instance |
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*/ |
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@Override |
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public String toString() { |
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return isPresent |
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? String.format("OptionalInt[%s]", value) |
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: "OptionalInt.empty"; |
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} |
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} |