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*
* The Universal Permissive License (UPL), Version 1.0
*
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* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
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* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
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* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
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* Software and the Larger Work(s), and to sublicense the foregoing rights on
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*
* This license is subject to the following condition:
*
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package org.graalvm.nativeimage;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.util.Arrays;
import org.graalvm.nativeimage.impl.AnnotationExtractor;
/**
* This class provides methods to query annotation information on {@link AnnotatedElement}s while
* trying to prevent, at image build time, side-effecting changes that impact the analysis results.
*
* The getAnnotation implementation in the JDK for Class, Field, and Method initializes the classes
* of all annotations present on that element, not just the class of the queried annotation. This
* leads to problems when not all annotation classes are present on the classpath/modulepath:
* querying an annotation whose class is present can fail with an exception because not all
* annotation classes are present. When this class's methods are called at image build time, then
* the minimal amount of class initialization is done: {@link #getAnnotation} only initializes the
* queried annotation class (when the annotation is actually present and therefore instantiated);
* {@link #isAnnotationPresent} and {@link #getAnnotationTypes} do not initialize any classes.
*
* When methods of this class are called not at image build time, i.e., at image run time or during
* the execution of a Java application not involving native image, then the JDK method to query the
* annotation is invoked. In these cases, there is no difference to the class initialization
* behavior of the JDK.
*
* Note that there is intentionally no `getAnnotations` method to query all annotations: all
* annotation classes must be initialized anyways by this method, so the JDK method can be invoke
* directly. In the image generator it should be generally avoided to use `getAnnotations`.
*
* @since 22.3
*/
public final class AnnotationAccess {
/**
* Implementation of {@link AnnotatedElement#isAnnotationPresent(Class)}.
*
* @since 22.3
*/
public static boolean isAnnotationPresent(AnnotatedElement element, Class annotationClass) {
if (ImageInfo.inImageBuildtimeCode()) {
return ImageSingletons.lookup(AnnotationExtractor.class).hasAnnotation(element, annotationClass);
} else {
return element.isAnnotationPresent(annotationClass);
}
}
/**
* Implementation of {@link AnnotatedElement#getAnnotation(Class)} .
*
* @since 22.3
*/
@SuppressWarnings("unchecked")
public static T getAnnotation(AnnotatedElement element, Class annotationType) {
if (ImageInfo.inImageBuildtimeCode()) {
return ImageSingletons.lookup(AnnotationExtractor.class).extractAnnotation(element, annotationType, false);
} else {
return element.getAnnotation(annotationType);
}
}
/**
* Implementation for retrieving all {@link Annotation#annotationType()}s for a {@code element}.
*
* @since 22.3
*/
@SuppressWarnings("unchecked")
public static Class[] getAnnotationTypes(AnnotatedElement element) {
if (ImageInfo.inImageBuildtimeCode()) {
return ImageSingletons.lookup(AnnotationExtractor.class).getAnnotationTypes(element);
} else {
return Arrays.stream(element.getAnnotations()).map(Annotation::annotationType).toArray(Class[]::new);
}
}
private AnnotationAccess() {
}
}
