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package lombok.javac;
import java.lang.annotation.Annotation;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Proxy;
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.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.Name;
import javax.lang.model.element.TypeElement;
import javax.lang.model.element.VariableElement;
import javax.lang.model.type.TypeMirror;
import javax.tools.Diagnostic;
import lombok.core.SpiLoadUtil;
public class HandlerLibrary {
private final Map<String, AnnotationHandlerContainer<?>> annotationHandlers = new HashMap<String, AnnotationHandlerContainer<?>>();
// private final Collection<JavacASTVisitor> visitorHandlers = new ArrayList<JavacASTVisitor>();
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;
}
@SuppressWarnings("unchecked")
public void handle(JavacNode node, Object annInstance) {
handler.handle(node, (T) annInstance);
}
}
public static HandlerLibrary load(Messager messager) {
HandlerLibrary library = new HandlerLibrary();
loadAnnotationHandlers(messager, library);
return library;
}
@SuppressWarnings("unchecked")
private static void loadAnnotationHandlers(Messager messager, 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 ) {
messager.printMessage(Diagnostic.Kind.WARNING,
"Duplicate handlers for annotation type: " + container.annotationClass.getName());
}
} catch ( ServiceConfigurationError e ) {
messager.printMessage(Diagnostic.Kind.WARNING,
"Can't load Lombok annotation handler for javac: " + e);
}
}
}
public void handleAnnotation(JavacNode node, TypeElement annotationType) {
AnnotationHandlerContainer<?> container = annotationHandlers.get(annotationType.getQualifiedName().toString());
if ( container == null ) return;
try {
container.handle(node, createAnnotation(container.annotationClass, annotationType.getQualifiedName(), node));
} catch ( AnnotationValueDecodeFail e ) {
node.addError(e.getMessage(), e.mirror, e.value);
}
}
private Object createAnnotation(Class<? extends Annotation> target, Name annotationName, JavacNode node)
throws AnnotationValueDecodeFail {
AnnotationMirror mirror = fetchMirror(annotationName, node);
if ( mirror == null ) throw new AssertionError("This can't be.");
InvocationHandler invocations = new AnnotationMirrorInvocationHandler(target, mirror);
return Proxy.newProxyInstance(target.getClassLoader(), new Class[] { target }, invocations);
}
private static class AnnotationValueDecodeFail extends Exception {
private static final long serialVersionUID = 1L;
AnnotationMirror mirror;
AnnotationValue value;
AnnotationValueDecodeFail(String msg, AnnotationMirror mirror, AnnotationValue value) {
super(msg);
this.mirror = mirror;
this.value = value;
}
}
private static class AnnotationMirrorInvocationHandler implements InvocationHandler {
private final AnnotationMirror mirror;
private final Map<String, Object> values = new HashMap<String, Object>();
AnnotationMirrorInvocationHandler(Class<?> target, AnnotationMirror mirror) throws AnnotationValueDecodeFail {
this.mirror = mirror;
for ( Method m : target.getDeclaredMethods() ) {
if ( !Modifier.isPublic(m.getModifiers()) ) continue;
values.put(m.getName(), decode(m));
}
}
private Object decode(Method m) throws AnnotationValueDecodeFail {
for ( Map.Entry<? extends ExecutableElement, ? extends AnnotationValue> entry :
mirror.getElementValues().entrySet() ) {
if ( entry.getKey().getSimpleName().contentEquals(m.getName()) ) {
AnnotationValue value = entry.getValue();
return convert(m.getReturnType(), mirror, value, value.getValue());
}
}
return m.getDefaultValue();
}
@Override public Object invoke(Object proxy, Method method, Object[] args) {
return values.get(method.getName());
}
private Object convert(Class<?> expected, AnnotationMirror mirror, AnnotationValue value, Object v) throws AnnotationValueDecodeFail {
if ( expected == int.class ) {
if ( v instanceof Number ) return ((Number)v).intValue();
else throw new AnnotationValueDecodeFail("Expected a numeric value here", mirror, value);
} else if ( expected == long.class ) {
if ( v instanceof Number ) return ((Number)v).longValue();
else throw new AnnotationValueDecodeFail("Expected a numeric value here", mirror, value);
} else if ( expected == short.class ) {
if ( v instanceof Number ) return ((Number)v).shortValue();
else throw new AnnotationValueDecodeFail("Expected a numeric value here", mirror, value);
} else if ( expected == byte.class ) {
if ( v instanceof Number ) return ((Number)v).byteValue();
else throw new AnnotationValueDecodeFail("Expected a numeric value here", mirror, value);
} else if ( expected == double.class ) {
if ( v instanceof Number ) return ((Number)v).doubleValue();
else throw new AnnotationValueDecodeFail("Expected a numeric value here", mirror, value);
} else if ( expected == float.class ) {
if ( v instanceof Number ) return ((Number)v).floatValue();
else throw new AnnotationValueDecodeFail("Expected a numeric value here", mirror, value);
} else if ( expected == char.class ) {
if ( v instanceof Character ) return v;
else throw new AnnotationValueDecodeFail("Expected a character here", mirror, value);
} else if ( expected == boolean.class ) {
if ( v instanceof Boolean ) return v;
else throw new AnnotationValueDecodeFail("Expected a boolean here", mirror, value);
} else if ( expected == String.class ) {
if ( v instanceof String ) return v;
else throw new AnnotationValueDecodeFail("Expected a String here", mirror, value);
} else if ( expected == Class.class ) {
if ( v instanceof TypeMirror ) {
try {
return Class.forName(v.toString());
} catch ( ClassNotFoundException e ) {
throw new AnnotationValueDecodeFail(
"I can't find this class. Lombok only works well with types in the core java libraries.",
mirror, value);
}
} else throw new AnnotationValueDecodeFail("Expected a class literal here", mirror, value);
} else if ( Enum.class.isAssignableFrom(
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