Source Code Cross Referenced for LocatableAnnotation.java in  » 6.0-JDK-Modules » jaxb-impl » com » sun » xml » bind » v2 » model » annotation » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » jaxb impl » com.sun.xml.bind.v2.model.annotation 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003:         * 
004:         * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005:         * 
006:         * The contents of this file are subject to the terms of either the GNU
007:         * General Public License Version 2 only ("GPL") or the Common Development
008:         * and Distribution License("CDDL") (collectively, the "License").  You
009:         * may not use this file except in compliance with the License. You can obtain
010:         * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
011:         * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
012:         * language governing permissions and limitations under the License.
013:         * 
014:         * When distributing the software, include this License Header Notice in each
015:         * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
016:         * Sun designates this particular file as subject to the "Classpath" exception
017:         * as provided by Sun in the GPL Version 2 section of the License file that
018:         * accompanied this code.  If applicable, add the following below the License
019:         * Header, with the fields enclosed by brackets [] replaced by your own
020:         * identifying information: "Portions Copyrighted [year]
021:         * [name of copyright owner]"
022:         * 
023:         * Contributor(s):
024:         * 
025:         * If you wish your version of this file to be governed by only the CDDL or
026:         * only the GPL Version 2, indicate your decision by adding "[Contributor]
027:         * elects to include this software in this distribution under the [CDDL or GPL
028:         * Version 2] license."  If you don't indicate a single choice of license, a
029:         * recipient has the option to distribute your version of this file under
030:         * either the CDDL, the GPL Version 2 or to extend the choice of license to
031:         * its licensees as provided above.  However, if you add GPL Version 2 code
032:         * and therefore, elected the GPL Version 2 license, then the option applies
033:         * only if the new code is made subject to such option by the copyright
034:         * holder.
035:         */
036:
037:        package com.sun.xml.bind.v2.model.annotation;
038:
039:        import java.lang.annotation.Annotation;
040:        import java.lang.reflect.InvocationHandler;
041:        import java.lang.reflect.InvocationTargetException;
042:        import java.lang.reflect.Method;
043:        import java.lang.reflect.Proxy;
044:        import java.lang.reflect.Modifier;
045:        import java.util.HashMap;
046:        import java.util.Map;
047:
048:        import com.sun.xml.bind.v2.runtime.Location;
049:
050:        /**
051:         * {@link Annotation} that also implements {@link Locatable}.
052:         *
053:         * @author Kohsuke Kawaguchi
054:         */
055:        public class LocatableAnnotation implements  InvocationHandler,
056:                Locatable, Location {
057:            private final Annotation core;
058:
059:            private final Locatable upstream;
060:
061:            /**
062:             * Wraps the annotation into a proxy so that the returned object will also implement
063:             * {@link Locatable}.
064:             */
065:            public static <A extends Annotation> A create(A annotation,
066:                    Locatable parentSourcePos) {
067:                if (annotation == null)
068:                    return null;
069:                Class<? extends Annotation> type = annotation.annotationType();
070:                if (quicks.containsKey(type)) {
071:                    // use the existing proxy implementation if available
072:                    return (A) quicks.get(type).newInstance(parentSourcePos,
073:                            annotation);
074:                }
075:
076:                // otherwise take the slow route
077:
078:                ClassLoader cl = LocatableAnnotation.class.getClassLoader();
079:
080:                try {
081:                    Class loadableT = Class.forName(type.getName(), false, cl);
082:                    if (loadableT != type)
083:                        return annotation; // annotation type not loadable from this class loader
084:
085:                    return (A) Proxy.newProxyInstance(cl, new Class[] { type,
086:                            Locatable.class }, new LocatableAnnotation(
087:                            annotation, parentSourcePos));
088:                } catch (ClassNotFoundException e) {
089:                    // annotation not loadable
090:                    return annotation;
091:                } catch (IllegalArgumentException e) {
092:                    // Proxy.newProxyInstance throws this if it cannot resolve this annotation
093:                    // in this classloader
094:                    return annotation;
095:                }
096:
097:            }
098:
099:            LocatableAnnotation(Annotation core, Locatable upstream) {
100:                this .core = core;
101:                this .upstream = upstream;
102:            }
103:
104:            public Locatable getUpstream() {
105:                return upstream;
106:            }
107:
108:            public Location getLocation() {
109:                return this ;
110:            }
111:
112:            public Object invoke(Object proxy, Method method, Object[] args)
113:                    throws Throwable {
114:                try {
115:                    if (method.getDeclaringClass() == Locatable.class)
116:                        return method.invoke(this , args);
117:                    if (Modifier.isStatic(method.getModifiers()))
118:                        // malicious code can pass in a static Method object.
119:                        // doing method.invoke() would end up executing it,
120:                        // so we need to protect against it.
121:                        throw new IllegalArgumentException();
122:
123:                    return method.invoke(core, args);
124:                } catch (InvocationTargetException e) {
125:                    if (e.getTargetException() != null)
126:                        throw e.getTargetException();
127:                    throw e;
128:                }
129:            }
130:
131:            public String toString() {
132:                return core.toString();
133:            }
134:
135:            /**
136:             * List of {@link Quick} implementations keyed by their annotation type.
137:             */
138:            private static final Map<Class, Quick> quicks = new HashMap<Class, Quick>();
139:
140:            static {
141:                for (Quick q : Init.getAll()) {
142:                    quicks.put(q.annotationType(), q);
143:                }
144:            }
145:        }
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