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提交 af982e18 编写于 作者: D darcy
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8005294: Consider default methods for additions to AnnotatedElement 

Reviewed-by: jfranck, plevart, mchung, abuckley, sogoel
上级 9172932e
隐藏空白更改
内联 并排
Showing with 426 addition and 3 deletion
src/share/classes/java/lang/reflect/AnnotatedElement.java
浏览文件 @ af982e18
......@@ -27,6 +27,15 @@ package java.lang.reflect;
import java.lang.annotation.Annotation;
import java.lang.annotation.AnnotationFormatError;
import java.lang.annotation.Repeatable;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;
import java.util.function.Function;
import java.util.stream.Collectors;
import sun.reflect.annotation.AnnotationSupport;
import sun.reflect.annotation.AnnotationType;
/**
* Represents an annotated element of the program currently running in this
......@@ -222,6 +231,18 @@ public interface AnnotatedElement {
* The caller of this method is free to modify the returned array; it will
* have no effect on the arrays returned to other callers.
*
* @implSpec The default implementation first calls {@link
* #getDeclaredAnnotationsByType(Class)} passing {@code
* annotationClass} as the argument. If the returned array has
* length greater than zero, the array is returned. If the returned
* array is zero-length and this {@code AnnotatedElement} is a
* class and the argument type is an inheritable annotation type,
* and the superclass of this {@code AnnotatedElement} is non-null,
* then the returned result is the result of calling {@link
* #getAnnotationsByType(Class)} on the superclass with {@code
* annotationClass} as the argument. Otherwise, a zero-length
* array is returned.
*
* @param <T> the type of the annotation to query for and return if present
* @param annotationClass the Class object corresponding to the
* annotation type
......@@ -230,7 +251,29 @@ public interface AnnotatedElement {
* @throws NullPointerException if the given annotation class is null
* @since 1.8
*/
<T extends Annotation> T[] getAnnotationsByType(Class<T> annotationClass);
default <T extends Annotation> T[] getAnnotationsByType(Class<T> annotationClass) {
/*
* Definition of associated: directly or indirectly present OR
* neither directly nor indirectly present AND the element is
* a Class, the annotation type is inheritable, and the
* annotation type is associated with the superclass of the
* element.
*/
T[] result = getDeclaredAnnotationsByType(annotationClass);
if (result.length == 0 && // Neither directly nor indirectly present
this instanceof Class && // the element is a class
AnnotationType.getInstance(annotationClass).isInherited()) { // Inheritable
Class<?> superClass = ((Class<?>) this).getSuperclass();
if (superClass != null) {
// Determine if the annotation is associated with the
// superclass
result = superClass.getAnnotationsByType(annotationClass);
}
}
return result;
}
/**
* Returns this element's annotation for the specified type if
......@@ -239,6 +282,11 @@ public interface AnnotatedElement {
* This method ignores inherited annotations. (Returns null if no
* annotations are directly present on this element.)
*
* @implSpec The default implementation first performs a null check
* and then loops over the results of {@link
* #getDeclaredAnnotations} returning the first annotation whose
* annotation type matches the argument type.
*
* @param <T> the type of the annotation to query for and return if directly present
* @param annotationClass the Class object corresponding to the
* annotation type
......@@ -247,7 +295,18 @@ public interface AnnotatedElement {
* @throws NullPointerException if the given annotation class is null
* @since 1.8
*/
<T extends Annotation> T getDeclaredAnnotation(Class<T> annotationClass);
default <T extends Annotation> T getDeclaredAnnotation(Class<T> annotationClass) {
Objects.requireNonNull(annotationClass);
// Loop over all directly-present annotations looking for a matching one
for (Annotation annotation : getDeclaredAnnotations()) {
if (annotationClass.equals(annotation.annotationType())) {
// More robust to do a dynamic cast at runtime instead
// of compile-time only.
return annotationClass.cast(annotation);
}
}
return null;
}
/**
* Returns this element's annotation(s) for the specified type if
......@@ -268,6 +327,22 @@ public interface AnnotatedElement {
* The caller of this method is free to modify the returned array; it will
* have no effect on the arrays returned to other callers.
*
* @implSpec The default implementation may call {@link
* #getDeclaredAnnotation(Class)} one or more times to find a
* directly present annotation and, if the annotation type is
* repeatable, to find a container annotation. If annotations of
* the annotation type {@code annotationClass} are found to be both
* directly and indirectly present, then {@link
* #getDeclaredAnnotations()} will get called to determine the
* order of the elements in the returned array.
*
* <p>Alternatively, the default implementation may call {@link
* #getDeclaredAnnotations()} a single time and the returned array
* examined for both directly and indirectly present
* annotations. The results of calling {@link
* #getDeclaredAnnotations()} are assumed to be consistent with the
* results of calling {@link #getDeclaredAnnotation(Class)}.
*
* @param <T> the type of the annotation to query for and return
* if directly or indirectly present
* @param annotationClass the Class object corresponding to the
......@@ -277,7 +352,16 @@ public interface AnnotatedElement {
* @throws NullPointerException if the given annotation class is null
* @since 1.8
*/
<T extends Annotation> T[] getDeclaredAnnotationsByType(Class<T> annotationClass);
default <T extends Annotation> T[] getDeclaredAnnotationsByType(Class<T> annotationClass) {
Objects.requireNonNull(annotationClass);
return AnnotationSupport.
getDirectlyAndIndirectlyPresent(Arrays.stream(getDeclaredAnnotations()).
collect(Collectors.toMap(Annotation::annotationType,
Function.identity(),
((first,second) -> first),
LinkedHashMap::new)),
annotationClass);
}
/**
* Returns annotations that are <em>directly present</em> on this element.
......
test/java/lang/reflect/AnnotatedElement/TestAnnotatedElementDefaults.java 0 → 100644
浏览文件 @ af982e18
/*
* Copyright (c) 2013, 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.
*
* 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.
*/
/*
* @test
* @bug 8005294
* @summary Check behavior of default methods of AnnotatedElement
* @author Joseph D. Darcy
*/
import java.lang.annotation.*;
import java.lang.reflect.*;
import java.util.*;
/**
* For annotation type tokens including, null, DirectlyPresent.class,
* IndirectlyPresent.class, etc. the behavior of
* AnnotedElementDelegate.foo(arg) is compared for equality to
* baseAnnotatedElement.foo(arg) on various kinds of annotated
* elements.
*/
public class TestAnnotatedElementDefaults {
public static void main(String... args) throws SecurityException {
int failures = 0;
for (AnnotatedElement annotElement : elementsToTest()) {
System.out.println(annotElement);
AnnotatedElementDelegate delegate = new AnnotatedElementDelegate(annotElement);
failures += testNullHandling(delegate);
for (Class<? extends Annotation> annotType : annotationsToTest()) {
failures += AnnotatedElementDelegate.testDelegate(delegate, annotType);
}
}
if (failures > 0) {
System.err.printf("%d failures%n", failures);
throw new RuntimeException();
}
}
private static List<AnnotatedElement> elementsToTest() {
List<AnnotatedElement> annotatedElements = new ArrayList<>();
annotatedElements.add(TestClass1Super.class);
annotatedElements.add(TestClass1.class);
for (Method method : TestClass1.class.getDeclaredMethods()) {
annotatedElements.add(method);
}
return annotatedElements;
}
private static List<Class<? extends Annotation>> annotationsToTest() {
List<Class<? extends Annotation>> annotations = new ArrayList<>();
annotations.add(Missing.class);
annotations.add(MissingRepeatable.class);
annotations.add(DirectlyPresent.class);
annotations.add(IndirectlyPresent.class);
annotations.add(IndirectlyPresentContainer.class);
annotations.add(DirectlyAndIndirectlyPresent.class);
annotations.add(DirectlyAndIndirectlyPresentContainer.class);
annotations.add(AssociatedDirectOnSuperClass.class);
annotations.add(AssociatedDirectOnSuperClassContainer.class);
annotations.add(AssociatedDirectOnSuperClassIndirectOnSubclass.class);
annotations.add(AssociatedDirectOnSuperClassIndirectOnSubclassContainer.class);
annotations.add(AssociatedIndirectOnSuperClassDirectOnSubclass.class);
annotations.add(AssociatedIndirectOnSuperClassDirectOnSubclassContainer.class);
return annotations;
}
private static int testNullHandling(AnnotatedElementDelegate delegate) {
int failures = 0;
try {
Object result = delegate.getDeclaredAnnotationsByType(null);
failures++;
} catch (NullPointerException npe) {
; // Expected
}
try {
Object result = delegate.getAnnotationsByType(null);
failures++;
} catch (NullPointerException npe) {
; // Expected
}
try {
Object result = delegate.getDeclaredAnnotation(null);
failures++;
} catch (NullPointerException npe) {
; // Expected
}
return failures;
}
}
// -----------------------------------------------------
@AssociatedDirectOnSuperClass(123)
@AssociatedIndirectOnSuperClass(234) @AssociatedIndirectOnSuperClass(345)
@AssociatedDirectOnSuperClassIndirectOnSubclass(987)
@AssociatedIndirectOnSuperClassDirectOnSubclass(1111) @AssociatedIndirectOnSuperClassDirectOnSubclass(2222)
class TestClass1Super {}
@DirectlyPresent(1)
@IndirectlyPresent(10) @IndirectlyPresent(11)
@AssociatedDirectOnSuperClassIndirectOnSubclass(876) @AssociatedDirectOnSuperClassIndirectOnSubclass(765)
@AssociatedIndirectOnSuperClassDirectOnSubclass(3333)
class TestClass1 extends TestClass1Super {
@DirectlyPresent(2)
@IndirectlyPresentContainer({@IndirectlyPresent(12)})
@DirectlyAndIndirectlyPresentContainer({@DirectlyAndIndirectlyPresent(84), @DirectlyAndIndirectlyPresent(96)})
public void foo() {return ;}
@IndirectlyPresentContainer({})
@DirectlyAndIndirectlyPresentContainer({@DirectlyAndIndirectlyPresent(11), @DirectlyAndIndirectlyPresent(22)})
@DirectlyAndIndirectlyPresent(33)
public void bar() {return ;}
}
// -----------------------------------------------------
@Retention(RetentionPolicy.RUNTIME)
@interface Missing {
int value();
}
// -----------------------------------------------------
@Retention(RetentionPolicy.RUNTIME)
@Repeatable(MissingRepeatableContainer.class)
@interface MissingRepeatable {
int value();
}
@Retention(RetentionPolicy.RUNTIME)
@interface MissingRepeatableContainer {
MissingRepeatable[] value();
}
// -----------------------------------------------------
@Retention(RetentionPolicy.RUNTIME)
@interface DirectlyPresent {
int value();
}
// -----------------------------------------------------
@Retention(RetentionPolicy.RUNTIME)
@Repeatable(IndirectlyPresentContainer.class)
@interface IndirectlyPresent {
int value();
}
@Retention(RetentionPolicy.RUNTIME)
@interface IndirectlyPresentContainer {
IndirectlyPresent[] value();
}
// -----------------------------------------------------
@Retention(RetentionPolicy.RUNTIME)
@Repeatable(DirectlyAndIndirectlyPresentContainer.class)
@interface DirectlyAndIndirectlyPresent {
int value();
}
@Retention(RetentionPolicy.RUNTIME)
@interface DirectlyAndIndirectlyPresentContainer {
DirectlyAndIndirectlyPresent[] value();
}
// -----------------------------------------------------
@Retention(RetentionPolicy.RUNTIME)
@Repeatable(AssociatedDirectOnSuperClassContainer.class)
@interface AssociatedDirectOnSuperClass {
int value();
}
@Retention(RetentionPolicy.RUNTIME)
@interface AssociatedDirectOnSuperClassContainer {
AssociatedDirectOnSuperClass[] value();
}
// -----------------------------------------------------
@Retention(RetentionPolicy.RUNTIME)
@Repeatable(AssociatedIndirectOnSuperClassContainer.class)
@interface AssociatedIndirectOnSuperClass {
int value();
}
@Retention(RetentionPolicy.RUNTIME)
@interface AssociatedIndirectOnSuperClassContainer {
AssociatedIndirectOnSuperClass[] value();
}
// -----------------------------------------------------
@Retention(RetentionPolicy.RUNTIME)
@Repeatable(AssociatedDirectOnSuperClassIndirectOnSubclassContainer.class)
@interface AssociatedDirectOnSuperClassIndirectOnSubclass {
int value();
}
@Retention(RetentionPolicy.RUNTIME)
@interface AssociatedDirectOnSuperClassIndirectOnSubclassContainer {
AssociatedDirectOnSuperClassIndirectOnSubclass[] value();
}
// -----------------------------------------------------
@Retention(RetentionPolicy.RUNTIME)
@Repeatable(AssociatedIndirectOnSuperClassDirectOnSubclassContainer.class)
@interface AssociatedIndirectOnSuperClassDirectOnSubclass {
int value();
}
@Retention(RetentionPolicy.RUNTIME)
@interface AssociatedIndirectOnSuperClassDirectOnSubclassContainer {
AssociatedIndirectOnSuperClassDirectOnSubclass[] value();
}
// -----------------------------------------------------
/**
* Helper class to ease calling the default methods of {@code
* AnnotatedElement} and comparing the results to other
* implementation.
*/
class AnnotatedElementDelegate implements AnnotatedElement {
private AnnotatedElement base;
public AnnotatedElementDelegate(AnnotatedElement base) {
Objects.requireNonNull(base);
this.base = base;
}
// Delegate to base implemenetation of AnnotatedElement methods
// without defaults.
@Override
public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
return base.getAnnotation(annotationClass);
}
@Override
public Annotation[] getAnnotations() {
return base.getAnnotations();
}
@Override
public Annotation[] getDeclaredAnnotations() {
return base.getDeclaredAnnotations();
}
public AnnotatedElement getBase() {
return base;
}
static int testDelegate(AnnotatedElementDelegate delegate,
Class<? extends Annotation> annotationClass) {
int failures = 0;
AnnotatedElement base = delegate.getBase();
// System.out.println("\tTesting " + delegate + "\ton\t" + annotationClass);
// <T extends Annotation> T[] getDeclaredAnnotationsByType(Class<T> annotationClass)
failures += annotationArrayCheck(delegate.getDeclaredAnnotationsByType(annotationClass),
base.getDeclaredAnnotationsByType(annotationClass),
annotationClass,
"Equality failure on getDeclaredAnnotationsByType(%s) on %s)%n");
// <T extends Annotation> T[] getAnnotationsByType(Class<T> annotationClass)
failures += annotationArrayCheck(delegate.getAnnotationsByType(annotationClass),
base.getAnnotationsByType(annotationClass),
annotationClass,
"Equality failure on getAnnotationsByType(%s) on %s)%n");
// <T extends Annotation> T getDeclaredAnnotation(Class<T> annotationClass)
if (!Objects.equals(delegate.getDeclaredAnnotation(annotationClass),
base.getDeclaredAnnotation(annotationClass))) {
failures++;
System.err.printf("Equality failure on getDeclaredAnnotation(%s) on %s)%n",
annotationClass, delegate);
}
return failures;
}
private static <T extends Annotation> int annotationArrayCheck(T[] delegate,
T[] base,
Class<? extends Annotation> annotationClass,
String message) {
int failures = 0;
if (!Objects.deepEquals(delegate,base)) {
failures = 1;
System.err.printf(message,
annotationClass,
delegate);
System.err.println("Base result:\t" + Arrays.toString(base));
System.err.println("Delegate result:\t " + Arrays.toString(delegate));
System.err.println();
}
return failures;
}
}
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