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107 lines
4.0 KiB
Java
107 lines
4.0 KiB
Java
/*
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* Copyright (c) 2019, 2024, 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 jdk.internal.javac;
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import java.lang.annotation.*;
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/**
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* Indicates the API declaration in question is associated with a
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* <em>preview feature</em>. See JEP 12: "Preview Language and VM
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* Features" (https://openjdk.org/jeps/12).
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*
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* Note this internal annotation is handled specially by the javac compiler.
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* To work properly with {@code --release older-release}, it requires special
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* handling in {@code make/langtools/src/classes/build/tools/symbolgenerator/CreateSymbols.java}
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* and {@code src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassReader.java}.
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*
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* @since 14
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*/
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// Match the meaningful targets of java.lang.Deprecated, omit local
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// variables and parameter declarations
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@Target({ElementType.METHOD,
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ElementType.CONSTRUCTOR,
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ElementType.FIELD,
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ElementType.PACKAGE,
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ElementType.MODULE,
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ElementType.TYPE})
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// CLASS retention will hopefully be sufficient for the purposes at hand
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@Retention(RetentionPolicy.CLASS)
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// *Not* @Documented
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public @interface PreviewFeature {
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/**
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* Name of the preview feature the annotated API is associated
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* with.
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*/
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public Feature feature();
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public boolean reflective() default false;
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/**
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* Enum of preview features in the current release.
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* Values should be annotated with the feature's {@code JEP}.
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*/
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public enum Feature {
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// while building the interim javac, the ClassReader will produce a warning when loading a class
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// keeping the constant of a feature that has been integrated or dropped, serves the purpose of muting such warnings.
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//---
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@JEP(number=477, title="Implicitly Declared Classes and Instance Main Methods", status="Third Preview")
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IMPLICIT_CLASSES,
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@JEP(number=487, title="Scoped Values", status="Fourth Preview")
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SCOPED_VALUES,
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@JEP(number=480, title="Structured Concurrency", status="Third Preview")
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STRUCTURED_CONCURRENCY,
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@JEP(number=466, title="ClassFile API", status="Second Preview")
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CLASSFILE_API,
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STREAM_GATHERERS,
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@JEP(number=476, title="Module Import Declarations", status="Preview")
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MODULE_IMPORTS,
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@JEP(number=478, title="Key Derivation Function API", status="Preview")
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KEY_DERIVATION,
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LANGUAGE_MODEL,
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/**
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* A key for testing.
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*/
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@JEP(number=2_147_483_647, title="Test Feature")
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TEST,
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;
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}
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/**
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* Annotation identifying the JEP associated with a preview feature.
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*/
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@Target(ElementType.FIELD)
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@Retention(RetentionPolicy.CLASS)
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@interface JEP {
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/** JEP number */
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int number() default 0;
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/** JEP title in plain text */
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String title();
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/** JEP status such as "Preview", "Second Preview", etc */
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String status() default "Preview";
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}
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}
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