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Spice up your java: Automatic Resource Management, automatic generation of getters, setters, equals, hashCode and toString, and more!
/*
* Copyright (C) 2009-2014 The Project Lombok Authors.
*
* 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.*;
import static lombok.eclipse.handlers.EclipseHandlerUtil.*;
import static lombok.eclipse.EclipseAugments.ASTNode_handled;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.SortedSet;
import java.util.TreeSet;
import lombok.Lombok;
import lombok.core.AnnotationValues;
import lombok.core.AnnotationValues.AnnotationValueDecodeFail;
import lombok.core.configuration.ConfigurationKeysLoader;
import lombok.core.HandlerPriority;
import lombok.core.SpiLoadUtil;
import lombok.core.TypeLibrary;
import lombok.core.TypeResolver;
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() {
ConfigurationKeysLoader.LoaderLoader.loadAllConfigurationKeys();
}
private TypeLibrary typeLibrary = new TypeLibrary();
private static class VisitorContainer {
private final EclipseASTVisitor visitor;
private final long priority;
private final boolean deferUntilPostDiet;
VisitorContainer(EclipseASTVisitor visitor) {
this.visitor = visitor;
this.deferUntilPostDiet = visitor.getClass().isAnnotationPresent(DeferUntilPostDiet.class);
HandlerPriority hp = visitor.getClass().getAnnotation(HandlerPriority.class);
this.priority = hp == null ? 0L : (((long)hp.value()) << 32) + hp.subValue();
}
public boolean deferUntilPostDiet() {
return deferUntilPostDiet;
}
public long getPriority() {
return priority;
}
}
private static class AnnotationHandlerContainer {
private final EclipseAnnotationHandler handler;
private final Class annotationClass;
private final long priority;
private final boolean deferUntilPostDiet;
AnnotationHandlerContainer(EclipseAnnotationHandler handler, Class annotationClass) {
this.handler = handler;
this.annotationClass = annotationClass;
this.deferUntilPostDiet = handler.getClass().isAnnotationPresent(DeferUntilPostDiet.class);
HandlerPriority hp = handler.getClass().getAnnotation(HandlerPriority.class);
this.priority = hp == null ? 0L : (((long)hp.value()) << 32) + hp.subValue();
}
public void handle(org.eclipse.jdt.internal.compiler.ast.Annotation annotation,
final EclipseNode annotationNode) {
AnnotationValues annValues = createAnnotation(annotationClass, annotationNode);
handler.handle(annValues, annotation, annotationNode);
}
public void preHandle(org.eclipse.jdt.internal.compiler.ast.Annotation annotation,
final EclipseNode annotationNode) {
AnnotationValues annValues = createAnnotation(annotationClass, annotationNode);
handler.preHandle(annValues, annotation, annotationNode);
}
public boolean deferUntilPostDiet() {
return deferUntilPostDiet;
}
public long getPriority() {
return priority;
}
}
private Map> annotationHandlers =
new HashMap>();
private Collection visitorHandlers = new ArrayList();
/**
* 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);
lib.calculatePriorities();
return lib;
}
private SortedSet priorities;
public SortedSet getPriorities() {
return priorities;
}
private void calculatePriorities() {
SortedSet set = new TreeSet();
for (AnnotationHandlerContainer container : annotationHandlers.values()) set.add(container.getPriority());
for (VisitorContainer container : visitorHandlers) set.add(container.getPriority());
this.priorities = Collections.unmodifiableSortedSet(set);
}
/** 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 annotationClass = handler.getAnnotationHandledByThisHandler();
AnnotationHandlerContainer container = new AnnotationHandlerContainer(handler, annotationClass);
String annotationClassName = container.annotationClass.getName().replace("$", ".");
if (lib.annotationHandlers.put(annotationClassName, container) != null) {
error(null, "Duplicate handlers for annotation type: " + annotationClassName, null);
}
lib.typeLibrary.addType(container.annotationClass.getName());
} catch (Throwable t) {
error(null, "Can't load Lombok annotation handler for Eclipse: ", t);
}
}
} catch (IOException e) {
throw 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(new VisitorContainer(visitor));
}
} catch (Throwable t) {
throw Lombok.sneakyThrow(t);
}
}
private boolean checkAndSetHandled(ASTNode node) {
return !ASTNode_handled.getAndSet(node, true);
}
private boolean needsHandling(ASTNode node) {
return !ASTNode_handled.get(node);
}
/**
* 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, long priority) {
TypeResolver resolver = new TypeResolver(annotationNode.getImportList());
TypeReference rawType = annotation.type;
if (rawType == null) return;
String fqn = resolver.typeRefToFullyQualifiedName(annotationNode, typeLibrary, toQualifiedName(annotation.type.getTypeName()));
if (fqn == null) return;
AnnotationHandlerContainer container = annotationHandlers.get(fqn);
if (container == null) return;
if (priority != container.getPriority()) return;
if (!annotationNode.isCompleteParse() && container.deferUntilPostDiet()) {
if (needsHandling(annotation)) container.preHandle(annotation, annotationNode);
return;
}
try {
if (checkAndSetHandled(annotation)) container.handle(annotation, annotationNode);
} catch (AnnotationValueDecodeFail fail) {
fail.owner.setError(fail.getMessage(), fail.idx);
} catch (Throwable t) {
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, long priority, boolean isCompleteParse) {
for (VisitorContainer container : visitorHandlers) {
if (!isCompleteParse && container.deferUntilPostDiet()) continue;
if (priority != container.getPriority()) continue;
try {
ast.traverse(container.visitor);
} catch (Throwable t) {
error((CompilationUnitDeclaration) ast.top().get(),
String.format("Lombok visitor handler %s failed", container.visitor.getClass()), t);
}
}
}
}