aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.xml.internal.bind.v2.model.annotation;
aoqi@0: 
aoqi@0: import java.lang.annotation.Annotation;
aoqi@0: import java.lang.reflect.InvocationHandler;
aoqi@0: import java.lang.reflect.InvocationTargetException;
aoqi@0: import java.lang.reflect.Method;
aoqi@0: import java.lang.reflect.Proxy;
aoqi@0: import java.lang.reflect.Modifier;
aoqi@0: import java.util.HashMap;
aoqi@0: import java.util.Map;
aoqi@0: 
aoqi@0: import com.sun.xml.internal.bind.v2.runtime.Location;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * {@link Annotation} that also implements {@link Locatable}.
aoqi@0:  *
aoqi@0:  * @author Kohsuke Kawaguchi
aoqi@0:  */
aoqi@0: public class LocatableAnnotation implements InvocationHandler, Locatable, Location {
aoqi@0:     private final Annotation core;
aoqi@0: 
aoqi@0:     private final Locatable upstream;
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Wraps the annotation into a proxy so that the returned object will also implement
aoqi@0:      * {@link Locatable}.
aoqi@0:      */
aoqi@0:     public static <A extends Annotation> A create( A annotation, Locatable parentSourcePos ) {
aoqi@0:         if(annotation==null)    return null;
aoqi@0:         Class<? extends Annotation> type = annotation.annotationType();
aoqi@0:         if(quicks.containsKey(type)) {
aoqi@0:             // use the existing proxy implementation if available
aoqi@0:             return (A)quicks.get(type).newInstance(parentSourcePos,annotation);
aoqi@0:         }
aoqi@0: 
aoqi@0:         // otherwise take the slow route
aoqi@0: 
aoqi@0:         ClassLoader cl = SecureLoader.getClassClassLoader(LocatableAnnotation.class);
aoqi@0: 
aoqi@0:         try {
aoqi@0:             Class loadableT = Class.forName(type.getName(), false, cl);
aoqi@0:             if(loadableT !=type)
aoqi@0:                 return annotation;  // annotation type not loadable from this class loader
aoqi@0: 
aoqi@0:             return (A)Proxy.newProxyInstance(cl,
aoqi@0:                     new Class[]{ type, Locatable.class },
aoqi@0:                     new LocatableAnnotation(annotation,parentSourcePos));
aoqi@0:         } catch (ClassNotFoundException e) {
aoqi@0:             // annotation not loadable
aoqi@0:             return annotation;
aoqi@0:         } catch (IllegalArgumentException e) {
aoqi@0:             // Proxy.newProxyInstance throws this if it cannot resolve this annotation
aoqi@0:             // in this classloader
aoqi@0:             return annotation;
aoqi@0:         }
aoqi@0: 
aoqi@0:     }
aoqi@0: 
aoqi@0:     LocatableAnnotation(Annotation core, Locatable upstream) {
aoqi@0:         this.core = core;
aoqi@0:         this.upstream = upstream;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public Locatable getUpstream() {
aoqi@0:         return upstream;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public Location getLocation() {
aoqi@0:         return this;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
aoqi@0:         try {
aoqi@0:             if(method.getDeclaringClass()==Locatable.class)
aoqi@0:                 return method.invoke(this,args);
aoqi@0:             if(Modifier.isStatic(method.getModifiers()))
aoqi@0:                 // malicious code can pass in a static Method object.
aoqi@0:                 // doing method.invoke() would end up executing it,
aoqi@0:                 // so we need to protect against it.
aoqi@0:                 throw new IllegalArgumentException();
aoqi@0: 
aoqi@0:             return method.invoke(core,args);
aoqi@0:         } catch (InvocationTargetException e) {
aoqi@0:             if(e.getTargetException()!=null)
aoqi@0:                 throw e.getTargetException();
aoqi@0:             throw e;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public String toString() {
aoqi@0:         return core.toString();
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * List of {@link Quick} implementations keyed by their annotation type.
aoqi@0:      */
aoqi@0:     private static final Map<Class,Quick> quicks = new HashMap<Class, Quick>();
aoqi@0: 
aoqi@0:     static {
aoqi@0:         for( Quick q : Init.getAll() ) {
aoqi@0:             quicks.put(q.annotationType(),q);
aoqi@0:         }
aoqi@0:     }
aoqi@0: }