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8227046: compiler implementation for sealed classes

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8225056: VM support for sealed classes
8227044: javax.lang.model for sealed classes
8227045: Preview APIs support for sealed classes
8227047: Javadoc for sealed types
8245854: JVM TI Specification for sealed classes

Co-authored-by: Harold Seigel <harold.seigel@oracle.com>
Co-authored-by: Jan Lahoda <jan.lahoda@oracle.com>
Reviewed-by: mcimadamore, forax, darcy, dholmes, jlahoda, lfoltan, mchung, sspitsyn, vromero
This commit is contained in:
Vicente Romero 2020-06-01 17:00:40 -04:00
parent 567692e4ae
commit d42bfef8a4
139 changed files with 6877 additions and 192 deletions
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67
src/java.base/share/classes/java/lang/Class.java
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@ -201,6 +201,8 @@ public final class Class<T> implements java.io.Serializable,
private static final int ENUM = 0x00004000;
private static final int SYNTHETIC = 0x00001000;
private static final ClassDesc[] EMPTY_CLASS_DESC_ARRAY = new ClassDesc[0];
private static native void registerNatives();
static {
registerNatives();
@ -4382,4 +4384,69 @@ public final class Class<T> implements java.io.Serializable,
@HotSpotIntrinsicCandidate
public native boolean isHidden();
/**
* {@preview Associated with sealed classes, a preview feature of the Java language.
*
* This method is associated with <i>sealed classes</i>, a preview
* feature of the Java language. Preview features
* may be removed in a future release, or upgraded to permanent
* features of the Java language.}
*
* Returns an array containing {@code ClassDesc} objects representing all the
* direct subclasses or direct implementation classes permitted to extend or implement this class or interface
* if it is sealed. If this {@code Class} object represents a primitive type, {@code void}, an array type,
* or a class or interface that is not sealed, an empty array is returned.
*
* @return an array of class descriptors of all the permitted subclasses of this class or interface
*
* @jls 8.1 Class Declarations
* @jls 9.1 Interface Declarations
* @since 15
*/
@jdk.internal.PreviewFeature(feature=jdk.internal.PreviewFeature.Feature.SEALED_CLASSES, essentialAPI=false)
public ClassDesc[] permittedSubclasses() {
String[] subclassNames;
if (isArray() || isPrimitive() || (subclassNames = getPermittedSubclasses0()).length == 0) {
return EMPTY_CLASS_DESC_ARRAY;
}
ClassDesc[] constants = new ClassDesc[subclassNames.length];
int i = 0;
for (String subclassName : subclassNames) {
try {
constants[i++] = ClassDesc.of(subclassName.replace('/', '.'));
} catch (IllegalArgumentException iae) {
throw new InternalError("Invalid type in permitted subclasses information: " + subclassName, iae);
}
}
return constants;
}
/**
* * {@preview Associated with sealed classes, a preview feature of the Java language.
*
* This method is associated with <i>sealed classes</i>, a preview
* feature of the Java language. Preview features
* may be removed in a future release, or upgraded to permanent
* features of the Java language.}
*
* Returns {@code true} if and only if this {@code Class} object represents a sealed class or interface.
* If this {@code Class} object represents a primitive type, {@code void}, or an array type, this method returns
* {@code false}.
*
* @return {@code true} if and only if this {@code Class} object represents a sealed class or interface.
*
* @jls 8.1 Class Declarations
* @jls 9.1 Interface Declarations
* @since 15
*/
@jdk.internal.PreviewFeature(feature=jdk.internal.PreviewFeature.Feature.SEALED_CLASSES, essentialAPI=false)
@SuppressWarnings("preview")
public boolean isSealed() {
if (isArray() || isPrimitive()) {
return false;
}
return permittedSubclasses().length != 0;
}
private native String[] getPermittedSubclasses0();
}