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/*
* Copyright (c) 2022 Contributors to the Eclipse Foundation
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.apf.impl;
import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.EmptyStackException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Stack;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.apf.AnnotatedElementHandler;
import org.glassfish.apf.AnnotationHandler;
import org.glassfish.apf.AnnotationInfo;
import org.glassfish.apf.AnnotationProcessor;
import org.glassfish.apf.AnnotationProcessorException;
import org.glassfish.apf.ComponentInfo;
import org.glassfish.apf.HandlerProcessingResult;
import org.glassfish.apf.ProcessingContext;
import org.glassfish.apf.ProcessingResult;
import org.glassfish.apf.ResultType;
import org.glassfish.apf.Scanner;
import static org.glassfish.apf.impl.HandlerProcessingResultImpl.getDefaultResult;
/**
* @author dochez
*/
public class AnnotationProcessorImpl implements AnnotationProcessor {
private static final Logger LOG = AnnotationUtils.getLogger();
private final Map> handlers = new HashMap<>();
private final Stack annotatedElements = new Stack<>();
private final Set visitedPackages = new HashSet<>();
private AnnotationProcessorImpl delegate;
private int errorCount;
public void setDelegate(AnnotationProcessorImpl delegate) {
this.delegate = delegate;
}
@Override
public ProcessingContext createContext() {
ProcessingContext ctx = new ProcessingContextImpl(this);
ctx.setErrorHandler(new DefaultErrorHandler());
return ctx;
}
/**
* Log a message on the default LOG
*/
@Override
public void log(Level level, AnnotationInfo locator, String localizedMessage) {
if (LOG.isLoggable(level)) {
if (locator == null) {
LOG.log(level, localizedMessage);
} else {
LOG.log(level,
MessageFormat.format("{2}\n symbol: {0}\n location: {1}",
new Object[] {
locator.getAnnotation().annotationType().getName(),
locator.getAnnotatedElement(),
localizedMessage,
}));
}
}
}
/**
* Starts the annotation processing tool passing the processing context which
* encapuslate all information necessary for the configuration of the tool.
*
* @param ctx is the initialized processing context
* @return the result of the annoations processing
*/
@Override
public ProcessingResult process(ProcessingContext ctx) throws AnnotationProcessorException {
Scanner scanner = ctx.getProcessingInput();
ProcessingResultImpl result = new ProcessingResultImpl();
errorCount = 0;
for (Class c : scanner.getElements()) {
result.add(process(ctx, c));
}
return result;
}
/**
* Process a set of classes from the parameter list rather than from the
* processing context. This allow the annotation handlers to call be the
* annotation processing tool when classes need to be processed in a
* particular context rather than when they are picked up by the scanner.
*
* @param ctx the processing context
* @param classes the list of classes to process
* @return the processing result for such classes
* @throws AnnotationProcessorException if handlers fail to process an annotation
*/
@Override
public ProcessingResult process(ProcessingContext ctx, Class[] classes) throws AnnotationProcessorException {
ProcessingResultImpl result = new ProcessingResultImpl();
for (Class c : classes) {
result.add(process(ctx, c));
}
return result;
}
private ProcessingResult process(ProcessingContext ctx, Class c) throws AnnotationProcessorException {
Scanner scanner = ctx.getProcessingInput();
ProcessingResultImpl result = new ProcessingResultImpl();
// let's see first if this package is new to us and annotated.
Package classPackage = c.getPackage();
if (classPackage != null && visitedPackages.add(classPackage)) {
// new package
result.add(classPackage, processAnnotations(ctx, ElementType.PACKAGE, classPackage));
}
ComponentInfo info = null;
try {
info = scanner.getComponentInfo(c);
} catch (NoClassDefFoundError err) {
// issue 456: allow verifier to report this issue
AnnotationProcessorException ape = new AnnotationProcessorException(
MessageFormat.format("Class [ {0} ] not found. Error while loading [ {1} ]", err.getMessage(), c));
ctx.getErrorHandler().error(ape);
// let's continue to the next class instead of aborting the whole
// annotation processing
return result;
}
// process the class itself.
AnnotatedElementHandler handler = ctx.getHandler();
logStart(handler, ElementType.TYPE, c);
result.add(c, processAnnotations(ctx, c));
// now dive into the fields.
for (Field field : info.getFields()) {
result.add(field, processAnnotations(ctx, ElementType.FIELD, field));
}
// constructors...
for (Constructor constructor : info.getConstructors()) {
logStart(ctx.getHandler(), ElementType.CONSTRUCTOR, constructor);
result.add(constructor, processAnnotations(ctx, constructor));
// parameters
processParameters(ctx, constructor.getParameterAnnotations());
logEnd(ctx.getHandler(), ElementType.CONSTRUCTOR, constructor);
}
// methods...
for (Method method : info.getMethods()) {
logStart(ctx.getHandler(), ElementType.METHOD, method);
result.add(method, processAnnotations(ctx, method));
// parameters
processParameters(ctx, method.getParameterAnnotations());
logEnd(ctx.getHandler(), ElementType.METHOD, method);
}
// Because of annotation inheritance, we need to to travel to
// the superclasses to ensure that annotations defined at the
// TYPE level are processed at this component level.
// Note : so far, I am ignoring the implemented interfaces
Class currentClass = c.getSuperclass();
while (currentClass != null && !currentClass.equals(Object.class)) {
// the trick is to add the results for this class, not
// for the ones they are defined in...
result.add(c, processAnnotations(ctx, currentClass));
currentClass = currentClass.getSuperclass();
}
// end of class processing, we need to get the top handler
// since it may have changed during the annotation processing
logEnd(ctx.getHandler(), ElementType.TYPE, c);
return result;
}
private HandlerProcessingResult processParameters(ProcessingContext ctx, Annotation[][] parametersAnnotations)
throws AnnotationProcessorException {
HandlerProcessingResultImpl result = new HandlerProcessingResultImpl();
// process the method parameters...
for (Annotation[] parameterAnnotations : parametersAnnotations) {
logStart(ctx.getHandler(), ElementType.PARAMETER, null);
if (parameterAnnotations != null) {
for (Annotation annotation : parameterAnnotations) {
AnnotationInfo info = new AnnotationInfo(ctx, null, annotation, ElementType.PARAMETER);
process(ctx, info, result);
dumpProcessingResult(result);
}
}
logEnd(ctx.getHandler(), ElementType.PARAMETER, null);
}
return result;
}
private HandlerProcessingResult processAnnotations(ProcessingContext ctx, ElementType type, AnnotatedElement element)
throws AnnotationProcessorException {
AnnotatedElementHandler handler = ctx.getHandler();
logStart(handler, type, element);
HandlerProcessingResult result = processAnnotations(ctx, element);
logEnd(handler, type, element);
dumpProcessingResult(result);
return result;
}
private HandlerProcessingResult processAnnotations(ProcessingContext ctx, AnnotatedElement element)
throws AnnotationProcessorException {
HandlerProcessingResultImpl result = new HandlerProcessingResultImpl();
try {
for (Annotation annotation : element.getAnnotations()) {
// initialize the result...
AnnotationInfo subElement = new AnnotationInfo(ctx, element, annotation, getTopElementType());
if (result.processedAnnotations().containsKey(annotation.annotationType())) {
LOG.log(Level.FINER, "Annotation {0} already processed.", annotation.annotationType());
} else {
process(ctx, subElement, result);
}
}
} catch (ArrayStoreException e) {
LOG.info("Exception " + e + " encountered while processing annotaton for element " + element
+ ". Message is: " + e.getMessage() + ". Ignoring annotations and proceeding.");
}
return result;
}
private void process(ProcessingContext ctx, AnnotationInfo element, HandlerProcessingResultImpl result)
throws AnnotationProcessorException {
Annotation annotation = element.getAnnotation();
LOG.log(Level.FINER, "Processing annotation: {0} delegate = {1}",
new Object[] {element, delegate});
result.addResult(annotation.annotationType(), ResultType.UNPROCESSED);
// we ignore all java.* annotations
Package annPackage = annotation.annotationType().getPackage();
if (annPackage != null && annPackage.getName().startsWith("java.lang")) {
return;
}
List annotationHandlers = handlers.get(annotation.annotationType().getName());
if (annotationHandlers == null) {
if (delegate == null) {
LOG.log(Level.FINER, "No handler defined for {0}", annotation);
} else {
delegate.process(ctx, element, result);
}
return;
}
for (AnnotationHandler handler : annotationHandlers) {
// here we need to be careful, we are ready to invoke a handler
// to process a particular annotation type. However, this handler
// may have defined a list of annotations that should be processed
// (if present on the annotated element) before itself.
// do this check and process those annotations first.
Class[] dependencies = handler.getTypeDependencies();
if (LOG.isLoggable(Level.FINEST)) {
LOG.log(Level.FINEST, "Dependencies of handler " + handler + ", " + Arrays.toString(dependencies));
}
if (dependencies != null) {
AnnotatedElement ae = element.getAnnotatedElement();
for (Class annotationType : dependencies) {
Annotation depAnnotation = ae.getAnnotation(annotationType);
if (depAnnotation != null) {
ResultType resultType = result.processedAnnotations().get(annotationType);
if (resultType == null || resultType == ResultType.UNPROCESSED) {
// annotation is present, process it.
AnnotationInfo info = new AnnotationInfo(ctx, ae, depAnnotation, getTopElementType());
process(ctx, info, result);
}
}
}
}
// at this point, all annotation that I declared depending on are processed
HandlerProcessingResult processingResult = null;
try {
processingResult = handler.processAnnotation(element);
} catch (AnnotationProcessorException ape) {
// I am logging this exception
log(Level.SEVERE, ape.getAnnotationInfo(), ape.getMessage());
// I am not throwing the exception unless it is fatal so annotation
// processing can continue and we have a chance to report all
// errors.
if (ape.isFatal()) {
throw ape;
}
if (++errorCount > 100) {
throw new AnnotationProcessorException("Too many errors, annotation processing abandoned.");
}
processingResult = getDefaultResult(annotation.annotationType(), ResultType.FAILED);
} catch (Throwable e) {
throw new AnnotationProcessorException(e.getMessage(), element, e);
}
result.addAll(processingResult);
}
}
private void dumpProcessingResult(HandlerProcessingResult result) {
if (result == null || !LOG.isLoggable(Level.FINER)) {
return;
}
Map, ResultType> annotationResults = result.processedAnnotations();
for (Map.Entry, ResultType> element : annotationResults.entrySet()) {
LOG.finer("Annotation " + element.getKey() + " : " + element.getValue());
}
}
@Override
public void pushAnnotationHandler(AnnotationHandler handler) {
String type = handler.getAnnotationType().getName();
pushAnnotationHandler(type, handler);
}
/**
* This method is similar to {@link #pushAnnotationHandler(AnnotationHandler)} except that
* it takes an additional String type argument which allows us to avoid extracting the information from the
* AnnotationHandler. Calling the AnnotationHandler can lead to its instantiation where as the annotation
* that a handler is responsible for handling is a metadata that can be statically extracted. This allows us to
* build more lazy systems.
*
* @param type
* @param handler
*/
public void pushAnnotationHandler(String type, AnnotationHandler handler) {
List currentHandlers = handlers.get(type);
if (currentHandlers==null) {
currentHandlers = new ArrayList<>();
handlers.put(type, currentHandlers);
}
currentHandlers.add(handler);
}
@Override
public void popAnnotationHandler(Class type) {
List currentHandlers = handlers.get(type.getName());
if (currentHandlers!=null) {
currentHandlers.remove(currentHandlers.size()-1);
}
}
@Override
public AnnotationHandler getAnnotationHandler(Class type) {
List currentHandlers = handlers.get(type.getName());
if (currentHandlers!=null && currentHandlers.size()>0) {
return currentHandlers.get(0);
}
return null;
}
/**
* @return the last element pushed on the stack which ElementType was
* the one passed or null if no stack element is of the given type.
*/
@Override
public AnnotatedElement getLastAnnotatedElement(ElementType type) {
for (int i = annotatedElements.size(); i != 0; i--) {
StackElement e = annotatedElements.get(i - 1);
if (e.getElementType().equals(type)) {
return e.getAnnotatedElement();
}
}
return null;
}
public Stack getStack() {
return annotatedElements;
}
private void logStart(AnnotatedElementHandler handler, ElementType type, AnnotatedElement c)
throws AnnotationProcessorException {
LOG.log(Level.FINEST, "{0} START : {1}", new Object[] {type, c});
// push it to our annotated element stack
annotatedElements.push(new StackElement(type, c));
if (delegate != null) {
delegate.getStack().push(new StackElement(type, c));
}
if (handler != null) {
handler.startElement(type, c);
}
}
private void logEnd(AnnotatedElementHandler handler, ElementType type, AnnotatedElement c)
throws AnnotationProcessorException {
LOG.log(Level.FINEST, "{0} END : {1}", new Object[] {type, c});
// pop it from our annotated element stack
annotatedElements.pop();
if (delegate != null) {
delegate.getStack().pop();
}
if (handler != null) {
handler.endElement(type, c);
}
}
/**
* @return the top annotated elements stack element type
*/
private ElementType getTopElementType() {
try {
StackElement top = annotatedElements.peek();
return top.getElementType();
} catch (EmptyStackException ex) {
return null;
}
}
}
