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/*
* Copyright © 2009-2011 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.eclipse;
import static lombok.eclipse.Eclipse.toQualifiedName;
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 java.util.WeakHashMap;
import lombok.Lombok;
import lombok.core.AnnotationValues;
import lombok.core.PrintAST;
import lombok.core.SpiLoadUtil;
import lombok.core.TypeLibrary;
import lombok.core.TypeResolver;
import lombok.core.AnnotationValues.AnnotationValueDecodeFail;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration;
import org.eclipse.jdt.internal.compiler.ast.TypeReference;
/**
* 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 {
/**
* Creates a new HandlerLibrary. Errors will be reported to the Eclipse Error log.
* You probably want to use {@link #load()} instead.
*/
public HandlerLibrary() {}
private TypeLibrary typeLibrary = new TypeLibrary();
private static class AnnotationHandlerContainer<T extends Annotation> {
private EclipseAnnotationHandler<T> handler;
private Class<T> annotationClass;
AnnotationHandlerContainer(EclipseAnnotationHandler<T> handler, Class<T> annotationClass) {
this.handler = handler;
this.annotationClass = annotationClass;
}
public void handle(org.eclipse.jdt.internal.compiler.ast.Annotation annotation,
final EclipseNode annotationNode) {
AnnotationValues<T> annValues = Eclipse.createAnnotation(annotationClass, annotationNode);
handler.handle(annValues, annotation, annotationNode);
}
public void preHandle(org.eclipse.jdt.internal.compiler.ast.Annotation annotation,
final EclipseNode annotationNode) {
AnnotationValues<T> annValues = Eclipse.createAnnotation(annotationClass, annotationNode);
handler.preHandle(annValues, annotation, annotationNode);
}
public boolean deferUntilPostDiet() {
return handler.deferUntilPostDiet();
}
}
private Map<String, AnnotationHandlerContainer<?>> annotationHandlers =
new HashMap<String, AnnotationHandlerContainer<?>>();
private Collection<EclipseASTVisitor> visitorHandlers = new ArrayList<EclipseASTVisitor>();
private boolean skipPrintAST;
/**
* Creates a new HandlerLibrary. Errors will be reported to the Eclipse Error log.
* 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() {
HandlerLibrary lib = new HandlerLibrary();
loadAnnotationHandlers(lib);
loadVisitorHandlers(lib);
return lib;
}
/** Uses SPI Discovery to find implementations of {@link EclipseAnnotationHandler}. */
@SuppressWarnings({"rawtypes", "unchecked"})
private static void loadAnnotationHandlers(HandlerLibrary lib) {
try {
for (EclipseAnnotationHandler<?> handler : SpiLoadUtil.findServices(EclipseAnnotationHandler.class, EclipseAnnotationHandler.class.getClassLoader())) {
try {
Class<? extends Annotation> annotationClass =
SpiLoadUtil.findAnnotationClass(handler.getClass(), EclipseAnnotationHandler.class);
AnnotationHandlerContainer<?> container = new AnnotationHandlerContainer(handler, annotationClass);
if (lib.annotationHandlers.put(container.annotationClass.getName(), container) != null) {
Eclipse.error(null, "Duplicate handlers for annotation type: " + container.annotationClass.getName(), null);
}
lib.typeLibrary.addType(container.annotationClass.getName());
} catch (Throwable t) {
Eclipse.error(null, "Can't load Lombok annotation handler for Eclipse: ", t);
}
}
} catch (IOException e) {
Lombok.sneakyThrow(e);
}
}
/** Uses SPI Discovery to find implementations of {@link EclipseASTVisitor}. */
private static void loadVisitorHandlers(HandlerLibrary lib) {
try {
for (EclipseASTVisitor visitor : SpiLoadUtil.findServices(EclipseASTVisitor.class, EclipseASTVisitor.class.getClassLoader())) {
lib.visitorHandlers.add(visitor);
}
} catch (Throwable t) {
throw Lombok.sneakyThrow(t);
}
}
private static final Map<ASTNode, Object> handledMap = new WeakHashMap<ASTNode, Object>();
private static final Object MARKER = new Object();
private boolean checkAndSetHandled(ASTNode node) {
synchronized (handledMap) {
return handledMap.put(node, MARKER) != MARKER;
}
}
private boolean needsHandling(ASTNode node) {
synchronized (handledMap) {
return handledMap.get(node) != MARKER;
}
}
/**
* Handles the provided annotation node by first finding a qualifying instance of
* {@link EclipseAnnotationHandler} and if one exists, calling it with a freshly cooked up
* instance of {@link 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.eclipse.handlers.HandleGetter}
* has been loaded.
*
* @param ast The Compilation Unit that contains the Annotation AST Node.
* @param annotationNode The Lombok AST Node representing the Annotation AST Node.
* @param annotation 'node.get()' - convenience parameter.
*/
public void handleAnnotation(CompilationUnitDeclaration ast, EclipseNode annotationNode, org.eclipse.jdt.internal.compiler.ast.Annotation annotation) {
String pkgName = annotationNode.getPackageDeclaration();
Collection<String> imports = annotationNode.getImportStatements();
TypeResolver resolver = new TypeResolver(typeLibrary, pkgName, imports);
TypeReference rawType = annotation.type;
if (rawType == null) return;
for (String fqn : resolver.findTypeMatches(annotationNode, toQualifiedName(annotation.type.getTypeName()))) {
boolean isPrintAST = fqn.equals(PrintAST.class.getName());
if (isPrintAST == skipPrintAST) continue;
AnnotationHandlerContainer<?> container = annotationHandlers.get(fqn);
if (container == null) continue;
if (!annotationNode.isCompleteParse() && container.deferUntilPostDiet()) {
if (needsHandling(annotation)) container.preHandle(annotation, annotationNode);
continue;
}
try {
if (checkAndSetHandled(annotation)) container.handle(annotation, annotationNode);
} catch (AnnotationValueDecodeFail fail) {
fail.owner.setError(fail.getMessage(), fail.idx);
} catch (Throwable t) {
Eclipse.error(ast, String.format("Lombok annotation handler %s failed", container.handler.getClass()), t);
}
}
}
/**
* Will call all registered {@link EclipseASTVisitor} instances.
*/
public void callASTVisitors(EclipseAST ast) {
for (EclipseASTVisitor visitor : visitorHandlers) try {
ast.traverse(visitor);
} catch (Throwable t) {
Eclipse.error((CompilationUnitDeclaration) ast.top().get(),
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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