Source Code Cross Referenced for JAXBContextFactory.java in  » 6.0-JDK-Modules » jaxb-xjc » com » sun » tools » xjc » runtime » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » jaxb xjc » com.sun.tools.xjc.runtime 
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.tools.xjc.runtime;
038:
039:        import java.util.ArrayList;
040:        import java.util.List;
041:        import java.util.Map;
042:        import java.util.StringTokenizer;
043:
044:        import javax.xml.bind.JAXBContext;
045:        import javax.xml.bind.JAXBException;
046:
047:        /**
048:         * This class implements the actual logic of {@link JAXBContext#newInstance}.
049:         *
050:         * <p>
051:         * This class works as a facade and all the actual work is delegated to
052:         * a JAXB provider that happens to be in the runtime (not necessarily the JAXB RI.)
053:         * This allows the generated code to be run with any JAXB provider.
054:         *
055:         * <p>
056:         * This code is only used when XJC generates interfaces/implementations.
057:         *
058:         * <p>
059:         * The trick to make this work is two ObjectFactory classes that we generate
060:         * in the interface/implementation mode.
061:         *
062:         * <p>
063:         * The public ObjectFactory follows the spec, and this is the one that's exposed
064:         * to users. The public ObjectFactory refers to interfaces, so they aren't
065:         * directly usable by a JAXB 2.0 implementation.
066:         *
067:         * <p>
068:         * The private one lives in the impl package, and this one is indistinguishable
069:         * from the ObjectFactory that we generate for the value class generation mode.
070:         * This private ObjectFactory refers to implementation classes, which are
071:         * also indistinguishable from value classes that JAXB generates.
072:         *
073:         * <p>
074:         * All in all, the private ObjectFactory plus implementation classes give
075:         * a JAXB provider an illusion that they are dealing with value classes
076:         * that happens to implement some interfaces.
077:         *
078:         * <p>
079:         * In this way, the JAXB RI can provide the portability even for the
080:         * interface/implementation generation mode.
081:         *
082:         * @since 2.0
083:         * @author Kohsuke Kawaguchi
084:         */
085:        public class JAXBContextFactory {
086:            private static final String DOT_OBJECT_FACTORY = ".ObjectFactory";
087:            private static final String IMPL_DOT_OBJECT_FACTORY = ".impl.ObjectFactory";
088:
089:            /**
090:             * The JAXB API will invoke this method via reflection
091:             */
092:            public static JAXBContext createContext(Class[] classes,
093:                    Map properties) throws JAXBException {
094:                Class[] r = new Class[classes.length];
095:                boolean modified = false;
096:
097:                // find any reference to our 'public' ObjectFactory and
098:                // replace that to our 'private' ObjectFactory.
099:                for (int i = 0; i < r.length; i++) {
100:                    Class c = classes[i];
101:                    String name = c.getName();
102:                    if (name.endsWith(DOT_OBJECT_FACTORY)
103:                            && !name.endsWith(IMPL_DOT_OBJECT_FACTORY)) {
104:                        // we never generate into the root package, so no need to worry about FQCN "ObjectFactory"
105:
106:                        // if we find one, tell the real JAXB provider to
107:                        // load foo.bar.impl.ObjectFactory
108:                        name = name.substring(0, name.length()
109:                                - DOT_OBJECT_FACTORY.length())
110:                                + IMPL_DOT_OBJECT_FACTORY;
111:
112:                        try {
113:                            c = c.getClassLoader().loadClass(name);
114:                        } catch (ClassNotFoundException e) {
115:                            throw new JAXBException(e);
116:                        }
117:
118:                        modified = true;
119:                    }
120:
121:                    r[i] = c;
122:                }
123:
124:                if (!modified) {
125:                    // if the class list doesn't contain any of our classes,
126:                    // this ContextFactory shouldn't have been called in the first place
127:                    // if we simply continue, we'll just end up with the infinite recursion.
128:
129:                    // the only case that I can think of where this could happen is
130:                    // when the user puts additional classes into the JAXB-generated
131:                    // package and pass them to JAXBContext.newInstance().
132:                    // Under normal use, this shouldn't happen.
133:
134:                    // anyway, bail out now.
135:                    // if you hit this problem and wondering how to get around the problem,
136:                    // subscribe and send a note to users@jaxb.dev.java.net (http://jaxb.dev.java.net/)
137:                    throw new JAXBException(
138:                            "Unable to find a JAXB implementation to delegate");
139:                }
140:
141:                // delegate to the JAXB provider in the system
142:                return JAXBContext.newInstance(r, properties);
143:            }
144:
145:            /**
146:             * The JAXB API will invoke this method via reflection
147:             */
148:            public static JAXBContext createContext(String contextPath,
149:                    ClassLoader classLoader, Map properties)
150:                    throws JAXBException {
151:
152:                List<Class> classes = new ArrayList<Class>();
153:                StringTokenizer tokens = new StringTokenizer(contextPath, ":");
154:
155:                // each package should be pointing to a JAXB RI generated
156:                // content interface package.
157:                //
158:                // translate them into a list of private ObjectFactories.
159:                try {
160:                    while (tokens.hasMoreTokens()) {
161:                        String pkg = tokens.nextToken();
162:                        classes.add(classLoader.loadClass(pkg
163:                                + IMPL_DOT_OBJECT_FACTORY));
164:                    }
165:                } catch (ClassNotFoundException e) {
166:                    throw new JAXBException(e);
167:                }
168:
169:                // delegate to the JAXB provider in the system
170:                return JAXBContext.newInstance(classes
171:                        .toArray(new Class[classes.size()]), properties);
172:            }
173:        }
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