47 ElementType.PACKAGE,
48 ElementType.MODULE,
49 ElementType.TYPE})
50 // CLASS retention will hopefully be sufficient for the purposes at hand
51 @Retention(RetentionPolicy.CLASS)
52 // *Not* @Documented
53 public @interface PreviewFeature {
54 /**
55 * Name of the preview feature the annotated API is associated
56 * with.
57 */
58 public Feature feature();
59
60 public boolean reflective() default false;
61
62 /**
63 * Enum of preview features in the current release.
64 * Values should be annotated with the feature's {@code JEP}.
65 */
66 public enum Feature {
67 // The JDK build process involves creating an interim javac which is then
68 // used to compile the rest of the JDK. The jdk.internal.javac.PreviewFeature
69 // annotation from the current sources is used when compiling interim javac.
70 // That's because the javac APIs of the current sources may be annotated with
71 // this annotation and they may be using the enum constants of the current sources.
72 // Furthermore, when compiling interim javac, the class files from the bootstrap JDK get
73 // used and those may also contain the PreviewFeature annotation. However, they may be
74 // using the enum constants of the bootstrap JDK's PreviewFeature annotation.
75 // If javac sees an annotation with an unknown enum constant, it produces a warning,
76 // and that in turn fails the build.
77 // So, in the current sources, we need to preserve the PreviewFeature enum constants
78 // for as long as the interim javac build needs it. As a result, we retain PreviewFeature
79 // enum constants for preview features that are present in the bootstrap JDK.
80 // Older constants can be removed.
81 //
82 // For example, Class-File API became final in JDK 24. As soon as JDK 23 was dropped as
83 // the bootstrap JDK, the CLASSFILE_API enum constant became eligible for removal.
84
85 //---
86 @JEP(number=505, title="Structured Concurrency", status="Fifth Preview")
87 STRUCTURED_CONCURRENCY,
88 @JEP(number = 502, title = "Stable Values", status = "Preview")
89 STABLE_VALUES,
90 @JEP(number=470, title="PEM Encodings of Cryptographic Objects", status="Preview")
91 PEM_API,
92 LANGUAGE_MODEL,
93 /**
94 * A key for testing.
95 */
96 @JEP(number=2_147_483_647, title="Test Feature")
97 TEST,
98 ;
99 }
100
101 /**
102 * Annotation identifying the JEP associated with a preview feature.
103 */
104 @Target(ElementType.FIELD)
|
47 ElementType.PACKAGE,
48 ElementType.MODULE,
49 ElementType.TYPE})
50 // CLASS retention will hopefully be sufficient for the purposes at hand
51 @Retention(RetentionPolicy.CLASS)
52 // *Not* @Documented
53 public @interface PreviewFeature {
54 /**
55 * Name of the preview feature the annotated API is associated
56 * with.
57 */
58 public Feature feature();
59
60 public boolean reflective() default false;
61
62 /**
63 * Enum of preview features in the current release.
64 * Values should be annotated with the feature's {@code JEP}.
65 */
66 public enum Feature {
67 @JEP(number=401, title="Value Classes and Objects", status = "Preview")
68 VALUE_OBJECTS,
69
70 // The JDK build process involves creating an interim javac which is then
71 // used to compile the rest of the JDK. The jdk.internal.javac.PreviewFeature
72 // annotation from the current sources is used when compiling interim javac.
73 // That's because the javac APIs of the current sources may be annotated with
74 // this annotation and they may be using the enum constants of the current sources.
75 // Furthermore, when compiling interim javac, the class files from the bootstrap JDK get
76 // used and those may also contain the PreviewFeature annotation. However, they may be
77 // using the enum constants of the bootstrap JDK's PreviewFeature annotation.
78 // If javac sees an annotation with an unknown enum constant, it produces a warning,
79 // and that in turn fails the build.
80 // So, in the current sources, we need to preserve the PreviewFeature enum constants
81 // for as long as the interim javac build needs it. As a result, we retain PreviewFeature
82 // enum constants for preview features that are present in the bootstrap JDK.
83 // Older constants can be removed.
84 //
85 // For example, Class-File API became final in JDK 24. As soon as JDK 23 was dropped as
86 // the bootstrap JDK, the CLASSFILE_API enum constant became eligible for removal.
87 //---
88 @JEP(number=505, title="Structured Concurrency", status="Fifth Preview")
89 STRUCTURED_CONCURRENCY,
90 @JEP(number = 502, title = "Stable Values", status = "Preview")
91 STABLE_VALUES,
92 @JEP(number=470, title="PEM Encodings of Cryptographic Objects", status="Preview")
93 PEM_API,
94 LANGUAGE_MODEL,
95 /**
96 * A key for testing.
97 */
98 @JEP(number=2_147_483_647, title="Test Feature")
99 TEST,
100 ;
101 }
102
103 /**
104 * Annotation identifying the JEP associated with a preview feature.
105 */
106 @Target(ElementType.FIELD)
|