| /* |
| * Copyright (c) 2016, 2018, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| package jdk.jfr.internal; |
| |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import jdk.jfr.AnnotationElement; |
| import jdk.jfr.Description; |
| import jdk.jfr.Label; |
| import jdk.jfr.Unsigned; |
| |
| public final class AnnotationConstruct { |
| |
| private static final class AnnotationInvokationHandler implements InvocationHandler { |
| |
| private final AnnotationElement annotationElement; |
| |
| AnnotationInvokationHandler(AnnotationElement a) { |
| this.annotationElement = a; |
| } |
| |
| @Override |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
| String methodName = method.getName(); |
| int parameters = method.getTypeParameters().length; |
| if (parameters == 0 && annotationElement.hasValue(methodName)) { |
| return annotationElement.getValue(methodName); |
| } |
| throw new UnsupportedOperationException("Flight Recorder proxy only supports members declared in annotation interfaces, i.e. not toString, equals etc."); |
| } |
| } |
| |
| private List<AnnotationElement> annotationElements = Collections.emptyList(); |
| private byte unsignedFlag = -1; |
| public AnnotationConstruct(List<AnnotationElement> ann) { |
| this.annotationElements = ann; |
| } |
| |
| public AnnotationConstruct() { |
| } |
| |
| public void setAnnotationElements(List<AnnotationElement> elements) { |
| annotationElements = Utils.smallUnmodifiable(elements); |
| } |
| |
| public String getLabel() { |
| Label label = getAnnotation(Label.class); |
| if (label == null) { |
| return null; |
| } |
| return label.value(); |
| } |
| |
| public String getDescription() { |
| Description description = getAnnotation(Description.class); |
| if (description == null) { |
| return null; |
| } |
| return description.value(); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public final <T> T getAnnotation(Class<? extends Annotation> clazz) { |
| AnnotationElement ae = getAnnotationElement(clazz); |
| if (ae != null) { |
| return (T) Proxy.newProxyInstance(clazz.getClassLoader(), new Class<?>[] { clazz }, new AnnotationInvokationHandler(ae)); |
| } |
| return null; |
| } |
| |
| public List<AnnotationElement> getUnmodifiableAnnotationElements() { |
| return annotationElements; |
| } |
| |
| // package private |
| boolean remove(AnnotationElement annotation) { |
| return annotationElements.remove(annotation); |
| } |
| |
| private AnnotationElement getAnnotationElement(Class<? extends Annotation> clazz) { |
| // if multiple annotation elements with the same name exists, prioritize |
| // the one with the same id. Note, id alone is not a guarantee, since it |
| // may differ between JVM instances. |
| long id = Type.getTypeId(clazz); |
| String className = clazz.getName(); |
| for (AnnotationElement a : getUnmodifiableAnnotationElements()) { |
| if (a.getTypeId() == id && a.getTypeName().equals(className)) { |
| return a; |
| } |
| } |
| for (AnnotationElement a : getUnmodifiableAnnotationElements()) { |
| if (a.getTypeName().equals(className)) { |
| return a; |
| } |
| } |
| return null; |
| } |
| |
| public boolean hasUnsigned() { |
| // Must be initialized lazily since some annotation elements |
| // are added after construction |
| if (unsignedFlag < 0) { |
| Unsigned unsigned = getAnnotation(Unsigned.class); |
| unsignedFlag = (byte) (unsigned == null ? 0 :1); |
| } |
| return unsignedFlag == (byte)1 ? true : false; |
| } |
| } |