| /* |
| * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.codemodel.internal; |
| |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| import java.lang.reflect.Type; |
| import java.lang.reflect.ParameterizedType; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.annotation.Annotation; |
| import java.util.Map; |
| import java.util.HashMap; |
| |
| /** |
| * Dynamically implements the typed annotation writer interfaces. |
| * |
| * @author Kohsuke Kawaguchi |
| */ |
| class TypedAnnotationWriter<A extends Annotation,W extends JAnnotationWriter<A>> |
| implements InvocationHandler, JAnnotationWriter<A> { |
| /** |
| * This is what we are writing to. |
| */ |
| private final JAnnotationUse use; |
| |
| /** |
| * The annotation that we are writing. |
| */ |
| private final Class<A> annotation; |
| |
| /** |
| * The type of the writer. |
| */ |
| private final Class<W> writerType; |
| |
| /** |
| * Keeps track of writers for array members. |
| * Lazily created. |
| */ |
| private Map<String,JAnnotationArrayMember> arrays; |
| |
| public TypedAnnotationWriter(Class<A> annotation, Class<W> writer, JAnnotationUse use) { |
| this.annotation = annotation; |
| this.writerType = writer; |
| this.use = use; |
| } |
| |
| public JAnnotationUse getAnnotationUse() { |
| return use; |
| } |
| |
| public Class<A> getAnnotationType() { |
| return annotation; |
| } |
| |
| @SuppressWarnings("unchecked") |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
| |
| if(method.getDeclaringClass()==JAnnotationWriter.class) { |
| try { |
| return method.invoke(this,args); |
| } catch (InvocationTargetException e) { |
| throw e.getTargetException(); |
| } |
| } |
| |
| String name = method.getName(); |
| Object arg=null; |
| if(args!=null && args.length>0) |
| arg = args[0]; |
| |
| // check how it's defined on the annotation |
| Method m = annotation.getDeclaredMethod(name); |
| Class<?> rt = m.getReturnType(); |
| |
| // array value |
| if(rt.isArray()) { |
| return addArrayValue(proxy,name,rt.getComponentType(),method.getReturnType(),arg); |
| } |
| |
| // sub annotation |
| if(Annotation.class.isAssignableFrom(rt)) { |
| Class<? extends Annotation> r = (Class<? extends Annotation>)rt; |
| return new TypedAnnotationWriter( |
| r,method.getReturnType(),use.annotationParam(name,r)).createProxy(); |
| } |
| |
| // scalar value |
| |
| if(arg instanceof JType) { |
| JType targ = (JType) arg; |
| checkType(Class.class,rt); |
| if(m.getDefaultValue()!=null) { |
| // check the default |
| if(targ.equals(targ.owner().ref((Class)m.getDefaultValue()))) |
| return proxy; // defaulted |
| } |
| use.param(name,targ); |
| return proxy; |
| } |
| |
| // other Java built-in types |
| checkType(arg.getClass(),rt); |
| if(m.getDefaultValue()!=null && m.getDefaultValue().equals(arg)) |
| // defaulted. no need to write out. |
| return proxy; |
| |
| if(arg instanceof String) { |
| use.param(name,(String)arg); |
| return proxy; |
| } |
| if(arg instanceof Boolean) { |
| use.param(name,(Boolean)arg); |
| return proxy; |
| } |
| if(arg instanceof Integer) { |
| use.param(name,(Integer)arg); |
| return proxy; |
| } |
| if(arg instanceof Class) { |
| use.param(name,(Class)arg); |
| return proxy; |
| } |
| if(arg instanceof Enum) { |
| use.param(name,(Enum)arg); |
| return proxy; |
| } |
| |
| throw new IllegalArgumentException("Unable to handle this method call "+method.toString()); |
| } |
| |
| @SuppressWarnings("unchecked") |
| private Object addArrayValue(Object proxy,String name, Class itemType, Class expectedReturnType, Object arg) { |
| if(arrays==null) |
| arrays = new HashMap<String,JAnnotationArrayMember>(); |
| JAnnotationArrayMember m = arrays.get(name); |
| if(m==null) { |
| m = use.paramArray(name); |
| arrays.put(name,m); |
| } |
| |
| // sub annotation |
| if(Annotation.class.isAssignableFrom(itemType)) { |
| Class<? extends Annotation> r = (Class<? extends Annotation>)itemType; |
| if(!JAnnotationWriter.class.isAssignableFrom(expectedReturnType)) |
| throw new IllegalArgumentException("Unexpected return type "+expectedReturnType); |
| return new TypedAnnotationWriter(r,expectedReturnType,m.annotate(r)).createProxy(); |
| } |
| |
| // primitive |
| if(arg instanceof JType) { |
| checkType(Class.class,itemType); |
| m.param((JType)arg); |
| return proxy; |
| } |
| checkType(arg.getClass(),itemType); |
| if(arg instanceof String) { |
| m.param((String)arg); |
| return proxy; |
| } |
| if(arg instanceof Boolean) { |
| m.param((Boolean)arg); |
| return proxy; |
| } |
| if(arg instanceof Integer) { |
| m.param((Integer)arg); |
| return proxy; |
| } |
| if(arg instanceof Class) { |
| m.param((Class)arg); |
| return proxy; |
| } |
| // TODO: enum constant. how should we handle it? |
| |
| throw new IllegalArgumentException("Unable to handle this method call "); |
| } |
| |
| |
| /** |
| * Check if the type of the argument matches our expectation. |
| * If not, report an error. |
| */ |
| private void checkType(Class<?> actual, Class<?> expected) { |
| if(expected==actual || expected.isAssignableFrom(actual)) |
| return; // no problem |
| |
| if( expected==JCodeModel.boxToPrimitive.get(actual) ) |
| return; // no problem |
| |
| throw new IllegalArgumentException("Expected "+expected+" but found "+actual); |
| } |
| |
| /** |
| * Creates a proxy and returns it. |
| */ |
| @SuppressWarnings("unchecked") |
| private W createProxy() { |
| return (W)Proxy.newProxyInstance( |
| SecureLoader.getClassClassLoader(writerType),new Class[]{writerType},this); |
| } |
| |
| /** |
| * Creates a new typed annotation writer. |
| */ |
| @SuppressWarnings("unchecked") |
| static <W extends JAnnotationWriter<?>> W create(Class<W> w, JAnnotatable annotatable) { |
| Class<? extends Annotation> a = findAnnotationType(w); |
| return (W)new TypedAnnotationWriter(a,w,annotatable.annotate(a)).createProxy(); |
| } |
| |
| private static Class<? extends Annotation> findAnnotationType(Class<?> clazz) { |
| for( Type t : clazz.getGenericInterfaces()) { |
| if(t instanceof ParameterizedType) { |
| ParameterizedType p = (ParameterizedType) t; |
| if(p.getRawType()==JAnnotationWriter.class) |
| return (Class<? extends Annotation>)p.getActualTypeArguments()[0]; |
| } |
| if(t instanceof Class<?>) { |
| // recursive search |
| Class<? extends Annotation> r = findAnnotationType((Class<?>)t); |
| if(r!=null) return r; |
| } |
| } |
| return null; |
| } |
| } |