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package lombok.javac;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.ServiceConfigurationError;
import java.util.ServiceLoader;
import javax.annotation.processing.Messager;
import javax.lang.model.element.TypeElement;
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;
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;
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 JavacAST.Node node) {
return handler.handle(Javac.createAnnotation(annotationClass, node), (JCAnnotation)node.get(), node);
}
}
public static HandlerLibrary load(Messager messager) {
HandlerLibrary library = new HandlerLibrary(messager);
loadAnnotationHandlers(library);
loadVisitorHandlers(library);
return library;
}
@SuppressWarnings("unchecked")
private static void loadAnnotationHandlers(HandlerLibrary lib) {
//No, that seemingly superfluous reference to JavacAnnotationHandler's classloader is not in fact superfluous!
Iterator<JavacAnnotationHandler> it = ServiceLoader.load(JavacAnnotationHandler.class,
JavacAnnotationHandler.class.getClassLoader()).iterator();
while ( it.hasNext() ) {
try {
JavacAnnotationHandler<?> handler = it.next();
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());
} catch ( ServiceConfigurationError e ) {
lib.javacWarning("Can't load Lombok annotation handler for javac", e);
}
}
}
public void javacWarning(String message) {
javacWarning(message, null);
}
public void javacWarning(String message, Throwable t) {
messager.printMessage(Diagnostic.Kind.WARNING, message + (t == null ? "" : (": " + t)));
}
public void javacError(String message) {
javacWarning(message, null);
}
public void javacError(String message, Throwable t) {
messager.printMessage(Diagnostic.Kind.ERROR, message + (t == null ? "" : (": " + t)));
}
private static void loadVisitorHandlers(HandlerLibrary lib) {
//No, that seemingly superfluous reference to JavacASTVisitor's classloader is not in fact superfluous!
Iterator<JavacASTVisitor> it = ServiceLoader.load(JavacASTVisitor.class,
JavacASTVisitor.class.getClassLoader()).iterator();
while ( it.hasNext() ) {
try {
JavacASTVisitor handler = it.next();
lib.visitorHandlers.add(handler);
} catch ( ServiceConfigurationError e ) {
lib.javacWarning("Can't load Lombok visitor handler for javac", e);
}
}
}
public boolean handleAnnotation(JCCompilationUnit unit, JavacAST.Node 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 ) {
javacError(String.format("Lombok annotation handler %s failed", container.handler.getClass()), t);
}
}
return handled;
}
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);
}
}
public boolean hasHandlerFor(TypeElement annotationType) {
return annotationHandlers.containsKey(annotationType.getQualifiedName().toString());
}
public void skipPrintAST() {
skipPrintAST = true;
}
public void skipAllButPrintAST() {
skipPrintAST = false;
}
}
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