Source Code Cross Referenced for XmlBeanDefinitionReader.java in  » J2EE » spring-framework-2.0.6 » org » springframework » beans » factory » xml » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.beans.factory.xml 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.beans.factory.xml;
018:
019:        import java.io.IOException;
020:        import java.io.InputStream;
021:
022:        import javax.xml.parsers.ParserConfigurationException;
023:
024:        import org.w3c.dom.Document;
025:        import org.xml.sax.EntityResolver;
026:        import org.xml.sax.ErrorHandler;
027:        import org.xml.sax.InputSource;
028:        import org.xml.sax.SAXException;
029:        import org.xml.sax.SAXParseException;
030:
031:        import org.springframework.beans.BeanUtils;
032:        import org.springframework.beans.factory.BeanDefinitionStoreException;
033:        import org.springframework.beans.factory.parsing.EmptyReaderEventListener;
034:        import org.springframework.beans.factory.parsing.FailFastProblemReporter;
035:        import org.springframework.beans.factory.parsing.NullSourceExtractor;
036:        import org.springframework.beans.factory.parsing.ProblemReporter;
037:        import org.springframework.beans.factory.parsing.ReaderEventListener;
038:        import org.springframework.beans.factory.parsing.SourceExtractor;
039:        import org.springframework.beans.factory.support.AbstractBeanDefinitionReader;
040:        import org.springframework.beans.factory.support.BeanDefinitionRegistry;
041:        import org.springframework.core.Constants;
042:        import org.springframework.core.io.DescriptiveResource;
043:        import org.springframework.core.io.Resource;
044:        import org.springframework.core.io.support.EncodedResource;
045:        import org.springframework.util.Assert;
046:        import org.springframework.util.ClassUtils;
047:        import org.springframework.util.xml.SimpleSaxErrorHandler;
048:        import org.springframework.util.xml.XmlValidationModeDetector;
049:
050:        /**
051:         * Bean definition reader for XML bean definitions.
052:         * Delegates the actual XML document reading to an implementation
053:         * of the {@link BeanDefinitionDocumentReader} interface.
054:         *
055:         * <p>Typically applied to a
056:         * {@link org.springframework.beans.factory.support.DefaultListableBeanFactory}
057:         * or a {@link org.springframework.context.support.GenericApplicationContext}.
058:         *
059:         * <p>This class loads a DOM document and applies the BeanDefinitionDocumentReader to it.
060:         * The document reader will register each bean definition with the given bean factory,
061:         * talking to the latter's implementation of the
062:         * {@link org.springframework.beans.factory.support.BeanDefinitionRegistry} interface.
063:         *
064:         * @author Juergen Hoeller
065:         * @author Rob Harrop
066:         * @since 26.11.2003
067:         * @see #setDocumentReaderClass
068:         * @see BeanDefinitionDocumentReader
069:         * @see DefaultBeanDefinitionDocumentReader
070:         * @see BeanDefinitionRegistry
071:         * @see org.springframework.beans.factory.support.DefaultListableBeanFactory
072:         * @see org.springframework.context.support.GenericApplicationContext
073:         */
074:        public class XmlBeanDefinitionReader extends
075:                AbstractBeanDefinitionReader {
076:
077:            /**
078:             * Indicates that the validation should be disabled.
079:             */
080:            public static final int VALIDATION_NONE = 0;
081:
082:            /**
083:             * Indicates that the validation mode should be detected automatically.
084:             */
085:            public static final int VALIDATION_AUTO = XmlValidationModeDetector.VALIDATION_AUTO;
086:
087:            /**
088:             * Indicates that DTD validation should be used.
089:             */
090:            public static final int VALIDATION_DTD = XmlValidationModeDetector.VALIDATION_DTD;
091:
092:            /**
093:             * Indicates that XSD validation should be used.
094:             */
095:            public static final int VALIDATION_XSD = XmlValidationModeDetector.VALIDATION_XSD;
096:
097:            /** Constants instance for this class */
098:            private static final Constants constants = new Constants(
099:                    XmlBeanDefinitionReader.class);
100:
101:            private boolean namespaceAware;
102:
103:            private int validationMode = VALIDATION_AUTO;
104:
105:            private Class parserClass;
106:
107:            private Class documentReaderClass = DefaultBeanDefinitionDocumentReader.class;
108:
109:            private ProblemReporter problemReporter = new FailFastProblemReporter();
110:
111:            private ReaderEventListener eventListener = new EmptyReaderEventListener();
112:
113:            private SourceExtractor sourceExtractor = new NullSourceExtractor();
114:
115:            private NamespaceHandlerResolver namespaceHandlerResolver;
116:
117:            private DocumentLoader documentLoader = new DefaultDocumentLoader();
118:
119:            private EntityResolver entityResolver;
120:
121:            private ErrorHandler errorHandler = new SimpleSaxErrorHandler(
122:                    logger);
123:
124:            private final XmlValidationModeDetector validationModeDetector = new XmlValidationModeDetector();
125:
126:            /**
127:             * Create new XmlBeanDefinitionReader for the given bean factory.
128:             * @param beanFactory the BeanFactory to load bean definitions into,
129:             * in the form of a BeanDefinitionRegistry
130:             */
131:            public XmlBeanDefinitionReader(BeanDefinitionRegistry beanFactory) {
132:                super (beanFactory);
133:
134:                // Determine EntityResolver to use.
135:                if (getResourceLoader() != null) {
136:                    this .entityResolver = new ResourceEntityResolver(
137:                            getResourceLoader());
138:                } else {
139:                    this .entityResolver = new DelegatingEntityResolver(
140:                            ClassUtils.getDefaultClassLoader());
141:                }
142:            }
143:
144:            /**
145:             * Set whether or not the XML parser should be XML namespace aware.
146:             * Default is "false".
147:             */
148:            public void setNamespaceAware(boolean namespaceAware) {
149:                this .namespaceAware = namespaceAware;
150:            }
151:
152:            /**
153:             * Set if the XML parser should validate the document and thus enforce a DTD.
154:             * @deprecated as of Spring 2.0: superseded by "validationMode"
155:             * @see #setValidationMode
156:             */
157:            public void setValidating(boolean validating) {
158:                this .validationMode = (validating ? VALIDATION_AUTO
159:                        : VALIDATION_NONE);
160:            }
161:
162:            /**
163:             * Set the validation mode to use by name. Defaults to {@link #VALIDATION_AUTO}.
164:             */
165:            public void setValidationModeName(String validationModeName) {
166:                setValidationMode(constants.asNumber(validationModeName)
167:                        .intValue());
168:            }
169:
170:            /**
171:             * Set the validation mode to use. Defaults to {@link #VALIDATION_AUTO}.
172:             */
173:            public void setValidationMode(int validationMode) {
174:                this .validationMode = validationMode;
175:            }
176:
177:            /**
178:             * Specify which {@link org.springframework.beans.factory.parsing.ProblemReporter} to use. Default implementation is
179:             * {@link org.springframework.beans.factory.parsing.FailFastProblemReporter} which exhibits fail fast behaviour. External tools
180:             * can provide an alternative implementation that collates errors and warnings for
181:             * display in the tool UI.
182:             */
183:            public void setProblemReporter(ProblemReporter problemReporter) {
184:                this .problemReporter = (problemReporter != null ? problemReporter
185:                        : new FailFastProblemReporter());
186:            }
187:
188:            /**
189:             * Specify which {@link ReaderEventListener} to use. Default implementation is
190:             * EmptyReaderEventListener which discards every event notification. External tools
191:             * can provide an alternative implementation to monitor the components being registered
192:             * in the BeanFactory.
193:             */
194:            public void setEventListener(ReaderEventListener eventListener) {
195:                this .eventListener = (eventListener != null ? eventListener
196:                        : new EmptyReaderEventListener());
197:            }
198:
199:            /**
200:             * Specify the {@link SourceExtractor} to use. The default implementation is
201:             * {@link NullSourceExtractor} which simply returns <code>null</code> as the source object.
202:             * This means that during normal runtime execution no additional source metadata is attached
203:             * to the bean configuration metadata.
204:             */
205:            public void setSourceExtractor(SourceExtractor sourceExtractor) {
206:                this .sourceExtractor = (sourceExtractor != null ? sourceExtractor
207:                        : new NullSourceExtractor());
208:            }
209:
210:            /**
211:             * Specify the {@link NamespaceHandlerResolver} to use. If none is specified a default
212:             * instance will be created by {@link #createDefaultNamespaceHandlerResolver()}.
213:             */
214:            public void setNamespaceHandlerResolver(
215:                    NamespaceHandlerResolver namespaceHandlerResolver) {
216:                this .namespaceHandlerResolver = namespaceHandlerResolver;
217:            }
218:
219:            /**
220:             * Specify the {@link DocumentLoader} to use. The default implementation is
221:             * {@link DefaultDocumentLoader} which loads {@link Document} instances using JAXP.
222:             */
223:            public void setDocumentLoader(DocumentLoader documentLoader) {
224:                this .documentLoader = (documentLoader != null ? documentLoader
225:                        : new DefaultDocumentLoader());
226:            }
227:
228:            /**
229:             * Set a SAX entity resolver to be used for parsing. By default,
230:             * BeansDtdResolver will be used. Can be overridden for custom entity
231:             * resolution, for example relative to some specific base path.
232:             * @see BeansDtdResolver
233:             */
234:            public void setEntityResolver(EntityResolver entityResolver) {
235:                this .entityResolver = entityResolver;
236:            }
237:
238:            /**
239:             * Set an implementation of the <code>org.xml.sax.ErrorHandler</code>
240:             * interface for custom handling of XML parsing errors and warnings.
241:             * <p>If not set, a default SimpleSaxErrorHandler is used that simply
242:             * logs warnings using the logger instance of the view class,
243:             * and rethrows errors to discontinue the XML transformation.
244:             * @see SimpleSaxErrorHandler
245:             */
246:            public void setErrorHandler(ErrorHandler errorHandler) {
247:                this .errorHandler = errorHandler;
248:            }
249:
250:            /**
251:             * Set the XmlBeanDefinitionParser implementation to use,
252:             * responsible for the actual parsing of XML bean definitions.
253:             * @deprecated as of Spring 2.0: superseded by "documentReaderClass"
254:             * @see #setDocumentReaderClass
255:             * @see XmlBeanDefinitionParser
256:             */
257:            public void setParserClass(Class parserClass) {
258:                if (this .parserClass == null
259:                        || !XmlBeanDefinitionParser.class
260:                                .isAssignableFrom(parserClass)) {
261:                    throw new IllegalArgumentException(
262:                            "'parserClass' must be an XmlBeanDefinitionParser");
263:                }
264:                this .parserClass = parserClass;
265:            }
266:
267:            /**
268:             * Specify the BeanDefinitionDocumentReader implementation to use,
269:             * responsible for the actual reading of the XML bean definition document.
270:             * <p>Default is DefaultBeanDefinitionDocumentReader.
271:             * @param documentReaderClass the desired BeanDefinitionDocumentReader implementation class
272:             * @see BeanDefinitionDocumentReader
273:             * @see DefaultBeanDefinitionDocumentReader
274:             */
275:            public void setDocumentReaderClass(Class documentReaderClass) {
276:                if (documentReaderClass == null
277:                        || !BeanDefinitionDocumentReader.class
278:                                .isAssignableFrom(documentReaderClass)) {
279:                    throw new IllegalArgumentException(
280:                            "documentReaderClass must be an implementation of the BeanDefinitionDocumentReader interface");
281:                }
282:                this .documentReaderClass = documentReaderClass;
283:            }
284:
285:            /**
286:             * Load bean definitions from the specified XML file.
287:             * @param resource the resource descriptor for the XML file
288:             * @return the number of bean definitions found
289:             * @throws BeanDefinitionStoreException in case of loading or parsing errors
290:             */
291:            public int loadBeanDefinitions(Resource resource)
292:                    throws BeanDefinitionStoreException {
293:                return loadBeanDefinitions(new EncodedResource(resource));
294:            }
295:
296:            /**
297:             * Load bean definitions from the specified XML file.
298:             * @param encodedResource the resource descriptor for the XML file,
299:             * allowing to specify an encoding to use for parsing the file
300:             * @return the number of bean definitions found
301:             * @throws BeanDefinitionStoreException in case of loading or parsing errors
302:             */
303:            public int loadBeanDefinitions(EncodedResource encodedResource)
304:                    throws BeanDefinitionStoreException {
305:                Assert.notNull(encodedResource,
306:                        "EncodedResource must not be null");
307:                if (logger.isInfoEnabled()) {
308:                    logger.info("Loading XML bean definitions from "
309:                            + encodedResource.getResource());
310:                }
311:
312:                try {
313:                    InputStream inputStream = encodedResource.getResource()
314:                            .getInputStream();
315:                    try {
316:                        InputSource inputSource = new InputSource(inputStream);
317:                        if (encodedResource.getEncoding() != null) {
318:                            inputSource.setEncoding(encodedResource
319:                                    .getEncoding());
320:                        }
321:                        return doLoadBeanDefinitions(inputSource,
322:                                encodedResource.getResource());
323:                    } finally {
324:                        inputStream.close();
325:                    }
326:                } catch (IOException ex) {
327:                    throw new BeanDefinitionStoreException(
328:                            "IOException parsing XML document from "
329:                                    + encodedResource.getResource(), ex);
330:                }
331:            }
332:
333:            /**
334:             * Load bean definitions from the specified XML file.
335:             * @param inputSource the SAX InputSource to read from
336:             * @return the number of bean definitions found
337:             * @throws BeanDefinitionStoreException in case of loading or parsing errors
338:             */
339:            public int loadBeanDefinitions(InputSource inputSource)
340:                    throws BeanDefinitionStoreException {
341:                return loadBeanDefinitions(inputSource,
342:                        "resource loaded through SAX InputSource");
343:            }
344:
345:            /**
346:             * Load bean definitions from the specified XML file.
347:             * @param inputSource the SAX InputSource to read from
348:             * @param resourceDescription a description of the resource
349:             * (can be <code>null</code> or empty)
350:             * @return the number of bean definitions found
351:             * @throws BeanDefinitionStoreException in case of loading or parsing errors
352:             */
353:            public int loadBeanDefinitions(InputSource inputSource,
354:                    String resourceDescription)
355:                    throws BeanDefinitionStoreException {
356:
357:                return doLoadBeanDefinitions(inputSource,
358:                        new DescriptiveResource(resourceDescription));
359:            }
360:
361:            /**
362:             * Actually load bean definitions from the specified XML file.
363:             * @param inputSource the SAX InputSource to read from
364:             * @param resource the resource descriptor for the XML file
365:             * @return the number of bean definitions found
366:             * @throws BeanDefinitionStoreException in case of loading or parsing errors
367:             */
368:            protected int doLoadBeanDefinitions(InputSource inputSource,
369:                    Resource resource) throws BeanDefinitionStoreException {
370:                try {
371:                    int validationMode = getValidationModeForResource(resource);
372:                    Document doc = this .documentLoader.loadDocument(
373:                            inputSource, this .entityResolver,
374:                            this .errorHandler, validationMode,
375:                            this .namespaceAware);
376:                    return registerBeanDefinitions(doc, resource);
377:                } catch (BeanDefinitionStoreException ex) {
378:                    throw ex;
379:                } catch (SAXParseException ex) {
380:                    throw new XmlBeanDefinitionStoreException(resource
381:                            .getDescription(), "Line " + ex.getLineNumber()
382:                            + " in XML document from " + resource
383:                            + " is invalid", ex);
384:                } catch (SAXException ex) {
385:                    throw new XmlBeanDefinitionStoreException(resource
386:                            .getDescription(), "XML document from " + resource
387:                            + " is invalid", ex);
388:                } catch (ParserConfigurationException ex) {
389:                    throw new BeanDefinitionStoreException(resource
390:                            .getDescription(),
391:                            "Parser configuration exception parsing XML from "
392:                                    + resource, ex);
393:                } catch (IOException ex) {
394:                    throw new BeanDefinitionStoreException(
395:                            resource.getDescription(),
396:                            "IOException parsing XML document from " + resource,
397:                            ex);
398:                } catch (Throwable ex) {
399:                    throw new BeanDefinitionStoreException(resource
400:                            .getDescription(),
401:                            "Unexpected exception parsing XML document from "
402:                                    + resource, ex);
403:                }
404:            }
405:
406:            /**
407:             * Gets the validation mode for the specified {@link Resource}. If no explicit
408:             * validation mode has been configured then the validation mode is
409:             * {@link #detectValidationMode detected}.
410:             */
411:            private int getValidationModeForResource(Resource resource) {
412:                if (this .validationMode != VALIDATION_AUTO) {
413:                    return this .validationMode;
414:                }
415:                int detectedMode = detectValidationMode(resource);
416:                if (detectedMode != VALIDATION_AUTO) {
417:                    return detectedMode;
418:                }
419:                // Hmm, we didn't get a clear indication... Let's assume XSD,
420:                // since apparently no DTD declaration has been found up until
421:                // detection stopped (before finding the document's root tag).
422:                return VALIDATION_XSD;
423:            }
424:
425:            /**
426:             * Detects which kind of validation to perform on the XML file identified
427:             * by the supplied {@link Resource}. If the
428:             * file has a <code>DOCTYPE</code> definition then DTD validation is used
429:             * otherwise XSD validation is assumed.
430:             */
431:            protected int detectValidationMode(Resource resource) {
432:                if (resource.isOpen()) {
433:                    throw new BeanDefinitionStoreException(
434:                            "Passed-in Resource ["
435:                                    + resource
436:                                    + "] contains an open stream: "
437:                                    + "cannot determine validation mode automatically. Either pass in a Resource "
438:                                    + "that is able to create fresh streams, or explicitly specify the validationMode "
439:                                    + "on your XmlBeanDefinitionReader instance.");
440:                }
441:
442:                InputStream inputStream;
443:                try {
444:                    inputStream = resource.getInputStream();
445:                } catch (IOException ex) {
446:                    throw new BeanDefinitionStoreException(
447:                            "Unable to determine validation mode for ["
448:                                    + resource
449:                                    + "]: cannot open InputStream. "
450:                                    + "Did you attempt to load directly from a SAX InputSource without specifying the "
451:                                    + "validationMode on your XmlBeanDefinitionReader instance?",
452:                            ex);
453:                }
454:
455:                try {
456:                    return this .validationModeDetector
457:                            .detectValidationMode(inputStream);
458:                } catch (IOException ex) {
459:                    throw new BeanDefinitionStoreException(
460:                            "Unable to determine validation mode for ["
461:                                    + resource
462:                                    + "]: an error occurred whilst reading from the InputStream.",
463:                            ex);
464:                }
465:            }
466:
467:            /**
468:             * Register the bean definitions contained in the given DOM document.
469:             * Called by <code>loadBeanDefinitions</code>.
470:             * <p>Creates a new instance of the parser class and invokes
471:             * <code>registerBeanDefinitions</code> on it.
472:             * @param doc the DOM document
473:             * @param resource the resource descriptor (for context information)
474:             * @return the number of bean definitions found
475:             * @throws BeanDefinitionStoreException in case of parsing errors
476:             * @see #loadBeanDefinitions
477:             * @see #setDocumentReaderClass
478:             * @see BeanDefinitionDocumentReader#registerBeanDefinitions
479:             */
480:            public int registerBeanDefinitions(Document doc, Resource resource)
481:                    throws BeanDefinitionStoreException {
482:                // Support old XmlBeanDefinitionParser SPI for backwards-compatibility.
483:                if (this .parserClass != null) {
484:                    XmlBeanDefinitionParser parser = (XmlBeanDefinitionParser) BeanUtils
485:                            .instantiateClass(this .parserClass);
486:                    return parser.registerBeanDefinitions(this , doc, resource);
487:                }
488:                // Read document based on new BeanDefinitionDocumentReader SPI.
489:                BeanDefinitionDocumentReader documentReader = createBeanDefinitionDocumentReader();
490:                int countBefore = getBeanFactory().getBeanDefinitionCount();
491:                documentReader.registerBeanDefinitions(doc,
492:                        createReaderContext(resource));
493:                return getBeanFactory().getBeanDefinitionCount() - countBefore;
494:            }
495:
496:            /**
497:             * Create the {@link BeanDefinitionDocumentReader} to use for actually
498:             * reading bean definitions from an XML document.
499:             * <p>Default implementation instantiates the specified "documentReaderClass".
500:             * @see #setDocumentReaderClass
501:             */
502:            protected BeanDefinitionDocumentReader createBeanDefinitionDocumentReader() {
503:                return (BeanDefinitionDocumentReader) BeanUtils
504:                        .instantiateClass(this .documentReaderClass);
505:            }
506:
507:            /**
508:             * Create the {@link XmlReaderContext} to pass over to the document reader.
509:             */
510:            protected XmlReaderContext createReaderContext(Resource resource) {
511:                if (this .namespaceHandlerResolver == null) {
512:                    this .namespaceHandlerResolver = createDefaultNamespaceHandlerResolver();
513:                }
514:                return new XmlReaderContext(resource, this .problemReporter,
515:                        this .eventListener, this .sourceExtractor, this ,
516:                        this .namespaceHandlerResolver);
517:            }
518:
519:            /**
520:             * Create the default implementation of {@link NamespaceHandlerResolver} used if none is specified.
521:             * Default implementation returns an instance of {@link DefaultNamespaceHandlerResolver}.
522:             */
523:            protected NamespaceHandlerResolver createDefaultNamespaceHandlerResolver() {
524:                return new DefaultNamespaceHandlerResolver(getResourceLoader()
525:                        .getClassLoader());
526:            }
527:
528:        }
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