Source Code Cross Referenced for JAXBSource.java in  » 6.0-JDK-Modules » jaxb-api » javax » xml » bind » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » jaxb api » javax.xml.bind.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
003:         * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
004:         */
005:        package javax.xml.bind.util;
006:
007:        import org.xml.sax.ContentHandler;
008:        import org.xml.sax.DTDHandler;
009:        import org.xml.sax.EntityResolver;
010:        import org.xml.sax.ErrorHandler;
011:        import org.xml.sax.InputSource;
012:        import org.xml.sax.SAXException;
013:        import org.xml.sax.SAXNotRecognizedException;
014:        import org.xml.sax.SAXParseException;
015:        import org.xml.sax.XMLReader;
016:        import org.xml.sax.ext.LexicalHandler;
017:        import org.xml.sax.helpers.XMLFilterImpl;
018:
019:        import javax.xml.bind.JAXBContext;
020:        import javax.xml.bind.JAXBException;
021:        import javax.xml.bind.Marshaller;
022:        import javax.xml.transform.sax.SAXSource;
023:
024:        /**
025:         * JAXP {@link javax.xml.transform.Source} implementation
026:         * that marshals a JAXB-generated object.
027:         * 
028:         * <p>
029:         * This utility class is useful to combine JAXB with
030:         * other Java/XML technologies.
031:         * 
032:         * <p>
033:         * The following example shows how to use JAXB to marshal a document
034:         * for transformation by XSLT.
035:         * 
036:         * <blockquote>
037:         *    <pre>
038:         *       MyObject o = // get JAXB content tree
039:         *       
040:         *       // jaxbContext is a JAXBContext object from which 'o' is created.
041:         *       JAXBSource source = new JAXBSource( jaxbContext, o );
042:         *       
043:         *       // set up XSLT transformation
044:         *       TransformerFactory tf = TransformerFactory.newInstance();
045:         *       Transformer t = tf.newTransformer(new StreamSource("test.xsl"));
046:         *       
047:         *       // run transformation
048:         *       t.transform(source,new StreamResult(System.out));
049:         *    </pre>
050:         * </blockquote>
051:         * 
052:         * <p>
053:         * The fact that JAXBSource derives from SAXSource is an implementation
054:         * detail. Thus in general applications are strongly discouraged from
055:         * accessing methods defined on SAXSource. In particular,
056:         * the setXMLReader and setInputSource methods shall never be called.
057:         * The XMLReader object obtained by the getXMLReader method shall
058:         * be used only for parsing the InputSource object returned by
059:         * the getInputSource method.
060:         * 
061:         * <p>
062:         * Similarly the InputSource object obtained by the getInputSource
063:         * method shall be used only for being parsed by the XMLReader object
064:         * returned by the getXMLReader.
065:         *
066:         * @author
067:         * 	Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
068:         */
069:        public class JAXBSource extends SAXSource {
070:
071:            /**
072:             * Creates a new {@link javax.xml.transform.Source} for the given content object.
073:             * 
074:             * @param   context
075:             *      JAXBContext that was used to create
076:             *      <code>contentObject</code>. This context is used
077:             *      to create a new instance of marshaller and must not be null.
078:             * @param   contentObject
079:             *      An instance of a JAXB-generated class, which will be
080:             *      used as a {@link javax.xml.transform.Source} (by marshalling it into XML).  It must
081:             *      not be null.
082:             * @throws JAXBException if an error is encountered while creating the
083:             * JAXBSource or if either of the parameters are null.
084:             */
085:            public JAXBSource(JAXBContext context, Object contentObject)
086:                    throws JAXBException {
087:
088:                this ((context == null) ? assertionFailed(Messages
089:                        .format(Messages.SOURCE_NULL_CONTEXT)) : context
090:                        .createMarshaller(),
091:
092:                (contentObject == null) ? assertionFailed(Messages
093:                        .format(Messages.SOURCE_NULL_CONTENT)) : contentObject);
094:            }
095:
096:            /**
097:             * Creates a new {@link javax.xml.transform.Source} for the given content object.
098:             * 
099:             * @param   marshaller
100:             *      A marshaller instance that will be used to marshal
101:             *      <code>contentObject</code> into XML. This must be
102:             *      created from a JAXBContext that was used to build
103:             *      <code>contentObject</code> and must not be null.
104:             * @param   contentObject
105:             *      An instance of a JAXB-generated class, which will be
106:             *      used as a {@link javax.xml.transform.Source} (by marshalling it into XML).  It must
107:             *      not be null.
108:             * @throws JAXBException if an error is encountered while creating the
109:             * JAXBSource or if either of the parameters are null.
110:             */
111:            public JAXBSource(Marshaller marshaller, Object contentObject)
112:                    throws JAXBException {
113:
114:                if (marshaller == null)
115:                    throw new JAXBException(Messages
116:                            .format(Messages.SOURCE_NULL_MARSHALLER));
117:
118:                if (contentObject == null)
119:                    throw new JAXBException(Messages
120:                            .format(Messages.SOURCE_NULL_CONTENT));
121:
122:                this .marshaller = marshaller;
123:                this .contentObject = contentObject;
124:
125:                super .setXMLReader(pseudoParser);
126:                // pass a dummy InputSource. We don't care
127:                super .setInputSource(new InputSource());
128:            }
129:
130:            private final Marshaller marshaller;
131:            private final Object contentObject;
132:
133:            // this object will pretend as an XMLReader.
134:            // no matter what parameter is specified to the parse method,
135:            // it just parse the contentObject.
136:            private final XMLReader pseudoParser = new XMLReader() {
137:                public boolean getFeature(String name)
138:                        throws SAXNotRecognizedException {
139:                    if (name.equals("http://xml.org/sax/features/namespaces"))
140:                        return true;
141:                    if (name
142:                            .equals("http://xml.org/sax/features/namespace-prefixes"))
143:                        return false;
144:                    throw new SAXNotRecognizedException(name);
145:                }
146:
147:                public void setFeature(String name, boolean value)
148:                        throws SAXNotRecognizedException {
149:                    if (name.equals("http://xml.org/sax/features/namespaces")
150:                            && value)
151:                        return;
152:                    if (name
153:                            .equals("http://xml.org/sax/features/namespace-prefixes")
154:                            && !value)
155:                        return;
156:                    throw new SAXNotRecognizedException(name);
157:                }
158:
159:                public Object getProperty(String name)
160:                        throws SAXNotRecognizedException {
161:                    if ("http://xml.org/sax/properties/lexical-handler"
162:                            .equals(name)) {
163:                        return lexicalHandler;
164:                    }
165:                    throw new SAXNotRecognizedException(name);
166:                }
167:
168:                public void setProperty(String name, Object value)
169:                        throws SAXNotRecognizedException {
170:                    if ("http://xml.org/sax/properties/lexical-handler"
171:                            .equals(name)) {
172:                        this .lexicalHandler = (LexicalHandler) value;
173:                        return;
174:                    }
175:                    throw new SAXNotRecognizedException(name);
176:                }
177:
178:                private LexicalHandler lexicalHandler;
179:
180:                // we will store this value but never use it by ourselves.
181:                private EntityResolver entityResolver;
182:
183:                public void setEntityResolver(EntityResolver resolver) {
184:                    this .entityResolver = resolver;
185:                }
186:
187:                public EntityResolver getEntityResolver() {
188:                    return entityResolver;
189:                }
190:
191:                private DTDHandler dtdHandler;
192:
193:                public void setDTDHandler(DTDHandler handler) {
194:                    this .dtdHandler = handler;
195:                }
196:
197:                public DTDHandler getDTDHandler() {
198:                    return dtdHandler;
199:                }
200:
201:                // SAX allows ContentHandler to be changed during the parsing,
202:                // but JAXB doesn't. So this repeater will sit between those
203:                // two components.
204:                private XMLFilterImpl repeater = new XMLFilterImpl();
205:
206:                public void setContentHandler(ContentHandler handler) {
207:                    repeater.setContentHandler(handler);
208:                }
209:
210:                public ContentHandler getContentHandler() {
211:                    return repeater.getContentHandler();
212:                }
213:
214:                private ErrorHandler errorHandler;
215:
216:                public void setErrorHandler(ErrorHandler handler) {
217:                    this .errorHandler = handler;
218:                }
219:
220:                public ErrorHandler getErrorHandler() {
221:                    return errorHandler;
222:                }
223:
224:                public void parse(InputSource input) throws SAXException {
225:                    parse();
226:                }
227:
228:                public void parse(String systemId) throws SAXException {
229:                    parse();
230:                }
231:
232:                public void parse() throws SAXException {
233:                    // parses a content object by using the given marshaller
234:                    // SAX events will be sent to the repeater, and the repeater
235:                    // will further forward it to an appropriate component.
236:                    try {
237:                        marshaller.marshal(contentObject, repeater);
238:                    } catch (JAXBException e) {
239:                        // wrap it to a SAXException
240:                        SAXParseException se = new SAXParseException(e
241:                                .getMessage(), null, null, -1, -1, e);
242:
243:                        // if the consumer sets an error handler, it is our responsibility
244:                        // to notify it.
245:                        if (errorHandler != null)
246:                            errorHandler.fatalError(se);
247:
248:                        // this is a fatal error. Even if the error handler
249:                        // returns, we will abort anyway.
250:                        throw se;
251:                    }
252:                }
253:            };
254:
255:            /**
256:             * Hook to throw exception from the middle of a contructor chained call
257:             * to this
258:             */
259:            private static Marshaller assertionFailed(String message)
260:                    throws JAXBException {
261:
262:                throw new JAXBException(message);
263:            }
264:        }
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