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Adds translation support for Java record types.
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jre_emul/android/platform/libcore/ojluni/src/main/java/java/lang/Record.java
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| /* | ||
| * Copyright (c) 2019, 2020, Oracle and/or its affiliates. All rights reserved. | ||
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| * | ||
| * This code is free software; you can redistribute it and/or modify it | ||
| * under the terms of the GNU General Public License version 2 only, as | ||
| * published by the Free Software Foundation. Oracle designates this | ||
| * particular file as subject to the "Classpath" exception as provided | ||
| * by Oracle in the LICENSE file that accompanied this code. | ||
| * | ||
| * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| * version 2 for more details (a copy is included in the LICENSE file that | ||
| * accompanied this code). | ||
| * | ||
| * You should have received a copy of the GNU General Public License version | ||
| * 2 along with this work; if not, write to the Free Software Foundation, | ||
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| * | ||
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| * or visit www.oracle.com if you need additional information or have any | ||
| * questions. | ||
| */ | ||
| package java.lang; | ||
|
|
||
| /** | ||
| * This is the common base class of all Java language record classes. | ||
| * | ||
| * <p>More information about records, including descriptions of the | ||
| * implicitly declared methods synthesized by the compiler, can be | ||
| * found in section 8.10 of | ||
| * <cite>The Java Language Specification</cite>. | ||
| * | ||
| * <p>A <em>record class</em> is a shallowly immutable, transparent carrier for | ||
| * a fixed set of values, called the <em>record components</em>. The Java | ||
| * language provides concise syntax for declaring record classes, whereby the | ||
| * record components are declared in the record header. The list of record | ||
| * components declared in the record header form the <em>record descriptor</em>. | ||
| * | ||
| * <p>A record class has the following mandated members: a <em>canonical | ||
| * constructor</em>, which must provide at least as much access as the record | ||
| * class and whose descriptor is the same as the record descriptor; | ||
| * a private final field corresponding to each component, whose name and | ||
| * type are the same as that of the component; a public accessor method | ||
| * corresponding to each component, whose name and return type are the same as | ||
| * that of the component. If not explicitly declared in the body of the record, | ||
| * implicit implementations for these members are provided. | ||
| * | ||
| * <p>The implicit declaration of the canonical constructor has the same accessibility | ||
| * as the record class and initializes the component fields from the corresponding | ||
| * constructor arguments. The implicit declaration of the accessor methods returns | ||
| * the value of the corresponding component field. The implicit declaration of the | ||
| * {@link Object#equals(Object)}, {@link Object#hashCode()}, and {@link Object#toString()} | ||
| * methods are derived from all of the component fields. | ||
| * | ||
| * <p>The primary reasons to provide an explicit declaration for the | ||
| * canonical constructor or accessor methods are to validate constructor | ||
| * arguments, perform defensive copies on mutable components, or normalize groups | ||
| * of components (such as reducing a rational number to lowest terms.) | ||
| * | ||
| * <p>For all record classes, the following invariant must hold: if a record R's | ||
| * components are {@code c1, c2, ... cn}, then if a record instance is copied | ||
| * as follows: | ||
| * <pre> | ||
| * R copy = new R(r.c1(), r.c2(), ..., r.cn()); | ||
| * </pre> | ||
| * then it must be the case that {@code r.equals(copy)}. | ||
| * | ||
| * @apiNote | ||
| * A record class that {@code implements} {@link java.io.Serializable} is said | ||
| * to be a <i>serializable record</i>. Serializable records are serialized and | ||
| * deserialized differently than ordinary serializable objects. During | ||
| * deserialization the record's canonical constructor is invoked to construct | ||
| * the record object. Certain serialization-related methods, such as readObject | ||
| * and writeObject, are ignored for serializable records. More information about | ||
| * serializable records can be found in the | ||
| * <a href="{@docRoot}/../specs/serialization/serial-arch.html#serialization-of-records"> | ||
| * <cite>Java Object Serialization Specification,</cite> Section 1.13, | ||
| * "Serialization of Records"</a>. | ||
| * | ||
| * @apiNote | ||
| * A record class structure can be obtained at runtime via reflection. | ||
| * See {@link Class#isRecord()} and {@link Class#getRecordComponents()} for more details. | ||
| * | ||
| * @jls 8.10 Record Types | ||
| * @since 16 | ||
| */ | ||
| public abstract class Record { | ||
| /** | ||
| * Constructor for record classes to call. | ||
| */ | ||
| protected Record() {} | ||
|
|
||
| /** | ||
| * Indicates whether some other object is "equal to" this one. In addition | ||
| * to the general contract of {@link Object#equals(Object) Object.equals}, | ||
| * record classes must further obey the invariant that when | ||
| * a record instance is "copied" by passing the result of the record component | ||
| * accessor methods to the canonical constructor, as follows: | ||
| * <pre> | ||
| * R copy = new R(r.c1(), r.c2(), ..., r.cn()); | ||
| * </pre> | ||
| * then it must be the case that {@code r.equals(copy)}. | ||
| * | ||
| * @implSpec | ||
| * The implicitly provided implementation returns {@code true} if | ||
| * and only if the argument is an instance of the same record class | ||
| * as this record, and each component of this record is equal to | ||
| * the corresponding component of the argument; otherwise, {@code | ||
| * false} is returned. Equality of a component {@code c} is | ||
| * determined as follows: | ||
| * <ul> | ||
| * | ||
| * <li> If the component is of a reference type, the component is | ||
| * considered equal if and only if {@link | ||
| * java.util.Objects#equals(Object,Object) | ||
| * Objects.equals(this.c, r.c} would return {@code true}. | ||
| * | ||
| * <li> If the component is of a primitive type, using the | ||
| * corresponding primitive wrapper class {@code PW} (the | ||
| * corresponding wrapper class for {@code int} is {@code | ||
| * java.lang.Integer}, and so on), the component is considered | ||
| * equal if and only if {@code | ||
| * PW.compare(this.c, r.c)} would return {@code 0}. | ||
| * | ||
| * </ul> | ||
| * | ||
| * Apart from the semantics described above, the precise algorithm | ||
| * used in the implicitly provided implementation is unspecified | ||
| * and is subject to change. The implementation may or may not use | ||
| * calls to the particular methods listed, and may or may not | ||
| * perform comparisons in the order of component declaration. | ||
| * | ||
| * @see java.util.Objects#equals(Object,Object) | ||
| * | ||
| * @param obj the reference object with which to compare. | ||
| * @return {@code true} if this record is equal to the | ||
| * argument; {@code false} otherwise. | ||
| */ | ||
| @Override | ||
| public abstract boolean equals(Object obj); | ||
|
|
||
| /** | ||
| * Returns a hash code value for the record. | ||
| * Obeys the general contract of {@link Object#hashCode Object.hashCode}. | ||
| * For records, hashing behavior is constrained by the refined contract | ||
| * of {@link Record#equals Record.equals}, so that any two records | ||
| * created from the same components must have the same hash code. | ||
| * | ||
| * @implSpec | ||
| * The implicitly provided implementation returns a hash code value derived | ||
| * by combining appropriate hashes from each component. | ||
| * The precise algorithm used in the implicitly provided implementation | ||
| * is unspecified and is subject to change within the above limits. | ||
| * The resulting integer need not remain consistent from one | ||
| * execution of an application to another execution of the same | ||
| * application, even if the hashes of the component values were to | ||
| * remain consistent in this way. Also, a component of primitive | ||
| * type may contribute its bits to the hash code differently than | ||
| * the {@code hashCode} of its primitive wrapper class. | ||
| * | ||
| * @see Object#hashCode() | ||
| * | ||
| * @return a hash code value for this record. | ||
| */ | ||
| @Override | ||
| public abstract int hashCode(); | ||
|
|
||
| /** | ||
| * Returns a string representation of the record. | ||
| * In accordance with the general contract of {@link Object#toString()}, | ||
| * the {@code toString} method returns a string that | ||
| * "textually represents" this record. The result should | ||
| * be a concise but informative representation that is easy for a | ||
| * person to read. | ||
| * <p> | ||
| * In addition to this general contract, record classes must further | ||
| * participate in the invariant that any two records which are | ||
| * {@linkplain Record#equals(Object) equal} must produce equal | ||
| * strings. This invariant is necessarily relaxed in the rare | ||
| * case where corresponding equal component values might fail | ||
| * to produce equal strings for themselves. | ||
| * | ||
| * @implSpec | ||
| * The implicitly provided implementation returns a string which | ||
| * contains the name of the record class, the names of components | ||
| * of the record, and string representations of component values, | ||
| * so as to fulfill the contract of this method. | ||
| * The precise format produced by this implicitly provided implementation | ||
| * is subject to change, so the present syntax should not be parsed | ||
| * by applications to recover record component values. | ||
| * | ||
| * @see Object#toString() | ||
| * | ||
| * @return a string representation of the object. | ||
| */ | ||
| @Override | ||
| public abstract String toString(); | ||
| } |
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