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package lombok.javac;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
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.AnnotationValues;
import lombok.core.SpiLoadUtil;
import lombok.core.TypeLibrary;
import lombok.core.TypeResolver;
import lombok.core.AnnotationValues.AnnotationValue;
import lombok.core.AnnotationValues.AnnotationValueDecodeFail;
import com.sun.tools.javac.tree.JCTree.JCAnnotation;
import com.sun.tools.javac.tree.JCTree.JCAssign;
import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
import com.sun.tools.javac.tree.JCTree.JCExpression;
import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
import com.sun.tools.javac.tree.JCTree.JCIdent;
import com.sun.tools.javac.tree.JCTree.JCLiteral;
import com.sun.tools.javac.tree.JCTree.JCNewArray;
import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
import com.sun.tools.javac.util.JCDiagnostic.SimpleDiagnosticPosition;
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;
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;
}
private Object calculateGuess(JCExpression expr) {
if ( expr instanceof JCLiteral ) {
return ((JCLiteral)expr).value;
} else if ( expr instanceof JCIdent || expr instanceof JCFieldAccess ) {
String x = expr.toString();
if ( x.endsWith(".class") ) x = x.substring(0, x.length() - 6);
else {
int idx = x.lastIndexOf('.');
if ( idx > -1 ) x = x.substring(idx + 1);
}
return x;
} else return null;
}
public void handle(final JavacAST.Node node) {
Map<String, AnnotationValue> values = new HashMap<String, AnnotationValue>();
JCAnnotation anno = (JCAnnotation) node.get();
List<JCExpression> arguments = anno.getArguments();
for ( Method m : annotationClass.getDeclaredMethods() ) {
if ( !Modifier.isPublic(m.getModifiers()) ) continue;
String name = m.getName();
List<String> raws = new ArrayList<String>();
List<Object> guesses = new ArrayList<Object>();
final List<DiagnosticPosition> positions = new ArrayList<DiagnosticPosition>();
for ( JCExpression arg : arguments ) {
JCAssign assign = (JCAssign) arg;
String mName = assign.lhs.toString();
if ( !mName.equals(name) ) continue;
JCExpression rhs = assign.rhs;
if ( rhs instanceof JCNewArray ) {
List<JCExpression> elems = ((JCNewArray)rhs).elems;
for ( JCExpression inner : elems ) {
raws.add(inner.toString());
guesses.add(calculateGuess(inner));
positions.add(new SimpleDiagnosticPosition(inner.pos));
}
} else {
raws.add(rhs.toString());
guesses.add(calculateGuess(rhs));
positions.add(new SimpleDiagnosticPosition(rhs.pos));
}
}
values.put(name, new AnnotationValue(node, raws, guesses) {
@Override public void setError(String message, int valueIdx) {
node.addError(message, positions.get(valueIdx));
}
});
}
handler.handle(new AnnotationValues<T>(annotationClass, values, 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 void handleAnnotation(JCCompilationUnit unit, JavacAST.Node node, JCAnnotation annotation) {
TypeResolver resolver = new TypeResolver(typeLibrary, node.getPackageDeclaration(), node.getImportStatements());
String rawType = annotation.annotationType.toString();
for ( String fqn : resolver.findTypeMatches(node, rawType) ) {
AnnotationHandlerContainer<?> container = annotationHandlers.get(fqn);
if ( container == null ) continue;
try {
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);
}
}
}
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());
}
}
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