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/*
* Copyright © 2009 Reinier Zwitserloot and Roel Spilker.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.javac;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import javax.annotation.processing.Messager;
import javax.tools.Diagnostic;
import lombok.core.PrintAST;
import lombok.core.SpiLoadUtil;
import lombok.core.TypeLibrary;
import lombok.core.TypeResolver;
import lombok.core.AnnotationValues.AnnotationValueDecodeFail;
import com.sun.tools.javac.tree.JCTree.JCAnnotation;
import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
/**
* This class tracks 'handlers' and knows how to invoke them for any given AST node.
*
* This class can find the handlers (via SPI discovery) and will set up the given AST node, such as
* building an AnnotationValues instance.
*/
public class HandlerLibrary {
private final TypeLibrary typeLibrary = new TypeLibrary();
private final Map<String, AnnotationHandlerContainer<?>> annotationHandlers = new HashMap<String, AnnotationHandlerContainer<?>>();
private final Collection<JavacASTVisitor> visitorHandlers = new ArrayList<JavacASTVisitor>();
private final Messager messager;
private boolean skipPrintAST = true;
/**
* Creates a new HandlerLibrary that will report any problems or errors to the provided messager.
* You probably want to use {@link #load(Messager)} instead.
*/
public HandlerLibrary(Messager messager) {
this.messager = messager;
}
private static class AnnotationHandlerContainer<T extends Annotation> {
private JavacAnnotationHandler<T> handler;
private Class<T> annotationClass;
AnnotationHandlerContainer(JavacAnnotationHandler<T> handler, Class<T> annotationClass) {
this.handler = handler;
this.annotationClass = annotationClass;
}
public boolean handle(final JavacNode node) {
return handler.handle(Javac.createAnnotation(annotationClass, node), (JCAnnotation)node.get(), node);
}
}
/**
* Creates a new HandlerLibrary that will report any problems or errors to the provided messager,
* then uses SPI discovery to load all annotation and visitor based handlers so that future calls
* to the handle methods will defer to these handlers.
*/
public static HandlerLibrary load(Messager messager) {
HandlerLibrary library = new HandlerLibrary(messager);
try {
loadAnnotationHandlers(library);
loadVisitorHandlers(library);
} catch (IOException e) {
System.err.println("Lombok isn't running due to misconfigured SPI files: " + e);
}
return library;
}
/** Uses SPI Discovery to find implementations of {@link JavacAnnotationHandler}. */
@SuppressWarnings({"rawtypes", "unchecked"})
private static void loadAnnotationHandlers(HandlerLibrary lib) throws IOException {
//No, that seemingly superfluous reference to JavacAnnotationHandler's classloader is not in fact superfluous!
for (JavacAnnotationHandler handler : SpiLoadUtil.findServices(JavacAnnotationHandler.class, JavacAnnotationHandler.class.getClassLoader())) {
Class<? extends Annotation> annotationClass =
SpiLoadUtil.findAnnotationClass(handler.getClass(), JavacAnnotationHandler.class);
AnnotationHandlerContainer<?> container = new AnnotationHandlerContainer(handler, annotationClass);
if (lib.annotationHandlers.put(container.annotationClass.getName(), container) != null) {
lib.javacWarning("Duplicate handlers for annotation type: " + container.annotationClass.getName());
}
lib.typeLibrary.addType(container.annotationClass.getName());
}
}
/** Uses SPI Discovery to find implementations of {@link JavacASTVisitor}. */
private static void loadVisitorHandlers(HandlerLibrary lib) throws IOException {
//No, that seemingly superfluous reference to JavacASTVisitor's classloader is not in fact superfluous!
for (JavacASTVisitor visitor : SpiLoadUtil.findServices(JavacASTVisitor.class, JavacASTVisitor.class.getClassLoader())) {
lib.visitorHandlers.add(visitor);
}
}
/** Generates a warning in the Messager that was used to initialize this HandlerLibrary. */
public void javacWarning(String message) {
javacWarning(message, null);
}
/** Generates a warning in the Messager that was used to initialize this HandlerLibrary. */
public void javacWarning(String message, Throwable t) {
messager.printMessage(Diagnostic.Kind.WARNING, message + (t == null ? "" : (": " + t)));
}
/** Generates an error in the Messager that was used to initialize this HandlerLibrary. */
public void javacError(String message) {
javacError(message, null);
}
/** Generates an error in the Messager that was used to initialize this HandlerLibrary. */
public void javacError(String message, Throwable t) {
messager.printMessage(Diagnostic.Kind.ERROR, message + (t == null ? "" : (": " + t)));
if (t != null) t.printStackTrace();
}
/**
* Handles the provided annotation node by first finding a qualifying instance of
* {@link JavacAnnotationHandler} and if one exists, calling it with a freshly cooked up
* instance of {@link lombok.core.AnnotationValues}.
*
* Note that depending on the printASTOnly flag, the {@link lombok.core.PrintAST} annotation
* will either be silently skipped, or everything that isn't {@code PrintAST} will be skipped.
*
* The HandlerLibrary will attempt to guess if the given annotation node represents a lombok annotation.
* For example, if {@code lombok.*} is in the import list, then this method will guess that
* {@code Getter} refers to {@code lombok.Getter}, presuming that {@link lombok.javac.handlers.HandleGetter}
* has been loaded.
*
* @param unit The Compilation Unit that contains the Annotation AST Node.
* @param node The Lombok AST Node representing the Annotation AST Node.
* @param annotation 'node.get()' - convenience parameter.
*/
public boolean handleAnnotation(JCCompilationUnit unit, JavacNode node, JCAnnotation annotation) {
TypeResolver resolver = new TypeResolver(typeLibrary, node.getPackageDeclaration(), node.getImportStatements());
String rawType = annotation.annotationType.toString();
boolean handled = false;
for (String fqn : resolver.findTypeMatches(node, rawType)) {
boolean isPrintAST = fqn.equals(PrintAST.class.getName());
if (isPrintAST == skipPrintAST) continue;
AnnotationHandlerContainer<?> container = annotationHandlers.get(fqn);
if (container == null) continue;
try {
handled |= container.handle(node);
} catch (AnnotationValueDecodeFail fail) {
fail.owner.setError(fail.getMessage(), fail.idx);
} catch (Throwable t) {
String sourceName = "(unknown).java";
if (unit != null && unit.sourcefile != null) sourceName = unit.sourcefile.getName();
javacError(String.format("Lombok annotation handler %s failed on " + sourceName, container.handler.getClass()), t);
}
}
return handled;
}
/**
* Will call all registered {@link JavacASTVisitor} instances.
*/
public void callASTVisitors(JavacAST ast) {
for (JavacASTVisitor visitor : visitorHandlers) try {
ast.traverse(visitor);
} catch (Throwable t) {
javacError(String.format("Lombok visitor handler %s failed", visitor.getClass()), t);
}
}
/**
* Lombok does not currently support triggering annotations in a specified order; the order is essentially
* random right now. This lack of order is particularly annoying for the {@code PrintAST} annotation,
* which is almost always intended to run last. Hence, this hack, which lets it in fact run last.
*
* @see #skipAllButPrintAST()
*/
public void skipPrintAST() {
skipPrintAST = true;
}
/** @see #skipPrintAST() */
public void skipAllButPrintAST() {
skipPrintAST = false;
}
}
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