Source Code Cross Referenced for XmlBeanDefinitionReader.java in  » J2EE » spring-framework-2.5 » 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 2.5 » 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.ResourceLoader;
045:        import org.springframework.core.io.support.EncodedResource;
046:        import org.springframework.util.Assert;
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 = XmlValidationModeDetector.VALIDATION_NONE;
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 registry the BeanFactory to load bean definitions into,
129:             * in the form of a BeanDefinitionRegistry
130:             */
131:            public XmlBeanDefinitionReader(BeanDefinitionRegistry registry) {
132:                super (registry);
133:            }
134:
135:            /**
136:             * Set whether or not the XML parser should be XML namespace aware.
137:             * Default is "false".
138:             */
139:            public void setNamespaceAware(boolean namespaceAware) {
140:                this .namespaceAware = namespaceAware;
141:            }
142:
143:            /**
144:             * Set if the XML parser should validate the document and thus enforce a DTD.
145:             * @deprecated as of Spring 2.0: superseded by "validationMode"
146:             * @see #setValidationMode
147:             */
148:            public void setValidating(boolean validating) {
149:                this .validationMode = (validating ? VALIDATION_AUTO
150:                        : VALIDATION_NONE);
151:            }
152:
153:            /**
154:             * Set the validation mode to use by name. Defaults to {@link #VALIDATION_AUTO}.
155:             */
156:            public void setValidationModeName(String validationModeName) {
157:                setValidationMode(constants.asNumber(validationModeName)
158:                        .intValue());
159:            }
160:
161:            /**
162:             * Set the validation mode to use. Defaults to {@link #VALIDATION_AUTO}.
163:             */
164:            public void setValidationMode(int validationMode) {
165:                this .validationMode = validationMode;
166:            }
167:
168:            /**
169:             * Specify which {@link org.springframework.beans.factory.parsing.ProblemReporter} to use. Default implementation is
170:             * {@link org.springframework.beans.factory.parsing.FailFastProblemReporter} which exhibits fail fast behaviour. External tools
171:             * can provide an alternative implementation that collates errors and warnings for
172:             * display in the tool UI.
173:             */
174:            public void setProblemReporter(ProblemReporter problemReporter) {
175:                this .problemReporter = (problemReporter != null ? problemReporter
176:                        : new FailFastProblemReporter());
177:            }
178:
179:            /**
180:             * Specify which {@link ReaderEventListener} to use. Default implementation is
181:             * EmptyReaderEventListener which discards every event notification. External tools
182:             * can provide an alternative implementation to monitor the components being registered
183:             * in the BeanFactory.
184:             */
185:            public void setEventListener(ReaderEventListener eventListener) {
186:                this .eventListener = (eventListener != null ? eventListener
187:                        : new EmptyReaderEventListener());
188:            }
189:
190:            /**
191:             * Specify the {@link SourceExtractor} to use. The default implementation is
192:             * {@link NullSourceExtractor} which simply returns <code>null</code> as the source object.
193:             * This means that during normal runtime execution no additional source metadata is attached
194:             * to the bean configuration metadata.
195:             */
196:            public void setSourceExtractor(SourceExtractor sourceExtractor) {
197:                this .sourceExtractor = (sourceExtractor != null ? sourceExtractor
198:                        : new NullSourceExtractor());
199:            }
200:
201:            /**
202:             * Specify the {@link NamespaceHandlerResolver} to use. If none is specified a default
203:             * instance will be created by {@link #createDefaultNamespaceHandlerResolver()}.
204:             */
205:            public void setNamespaceHandlerResolver(
206:                    NamespaceHandlerResolver namespaceHandlerResolver) {
207:                this .namespaceHandlerResolver = namespaceHandlerResolver;
208:            }
209:
210:            /**
211:             * Specify the {@link DocumentLoader} to use. The default implementation is
212:             * {@link DefaultDocumentLoader} which loads {@link Document} instances using JAXP.
213:             */
214:            public void setDocumentLoader(DocumentLoader documentLoader) {
215:                this .documentLoader = (documentLoader != null ? documentLoader
216:                        : new DefaultDocumentLoader());
217:            }
218:
219:            /**
220:             * Set a SAX entity resolver to be used for parsing. By default,
221:             * BeansDtdResolver will be used. Can be overridden for custom entity
222:             * resolution, for example relative to some specific base path.
223:             * @see BeansDtdResolver
224:             */
225:            public void setEntityResolver(EntityResolver entityResolver) {
226:                this .entityResolver = entityResolver;
227:            }
228:
229:            /**
230:             * Return the EntityResolver to use, building a default resolver
231:             * if none specified.
232:             */
233:            protected EntityResolver getEntityResolver() {
234:                if (this .entityResolver == null) {
235:                    // Determine default EntityResolver to use.
236:                    ResourceLoader resourceLoader = getResourceLoader();
237:                    if (resourceLoader != null) {
238:                        this .entityResolver = new ResourceEntityResolver(
239:                                resourceLoader);
240:                    } else {
241:                        this .entityResolver = new DelegatingEntityResolver(
242:                                getBeanClassLoader());
243:                    }
244:                }
245:                return this .entityResolver;
246:            }
247:
248:            /**
249:             * Set an implementation of the <code>org.xml.sax.ErrorHandler</code>
250:             * interface for custom handling of XML parsing errors and warnings.
251:             * <p>If not set, a default SimpleSaxErrorHandler is used that simply
252:             * logs warnings using the logger instance of the view class,
253:             * and rethrows errors to discontinue the XML transformation.
254:             * @see SimpleSaxErrorHandler
255:             */
256:            public void setErrorHandler(ErrorHandler errorHandler) {
257:                this .errorHandler = errorHandler;
258:            }
259:
260:            /**
261:             * Set the XmlBeanDefinitionParser implementation to use,
262:             * responsible for the actual parsing of XML bean definitions.
263:             * @deprecated as of Spring 2.0: superseded by "documentReaderClass"
264:             * @see #setDocumentReaderClass
265:             * @see XmlBeanDefinitionParser
266:             */
267:            public void setParserClass(Class parserClass) {
268:                if (this .parserClass == null
269:                        || !XmlBeanDefinitionParser.class
270:                                .isAssignableFrom(parserClass)) {
271:                    throw new IllegalArgumentException(
272:                            "'parserClass' must be an XmlBeanDefinitionParser");
273:                }
274:                this .parserClass = parserClass;
275:            }
276:
277:            /**
278:             * Specify the BeanDefinitionDocumentReader implementation to use,
279:             * responsible for the actual reading of the XML bean definition document.
280:             * <p>Default is DefaultBeanDefinitionDocumentReader.
281:             * @param documentReaderClass the desired BeanDefinitionDocumentReader implementation class
282:             * @see BeanDefinitionDocumentReader
283:             * @see DefaultBeanDefinitionDocumentReader
284:             */
285:            public void setDocumentReaderClass(Class documentReaderClass) {
286:                if (documentReaderClass == null
287:                        || !BeanDefinitionDocumentReader.class
288:                                .isAssignableFrom(documentReaderClass)) {
289:                    throw new IllegalArgumentException(
290:                            "documentReaderClass must be an implementation of the BeanDefinitionDocumentReader interface");
291:                }
292:                this .documentReaderClass = documentReaderClass;
293:            }
294:
295:            /**
296:             * Load bean definitions from the specified XML file.
297:             * @param resource the resource descriptor for the XML file
298:             * @return the number of bean definitions found
299:             * @throws BeanDefinitionStoreException in case of loading or parsing errors
300:             */
301:            public int loadBeanDefinitions(Resource resource)
302:                    throws BeanDefinitionStoreException {
303:                return loadBeanDefinitions(new EncodedResource(resource));
304:            }
305:
306:            /**
307:             * Load bean definitions from the specified XML file.
308:             * @param encodedResource the resource descriptor for the XML file,
309:             * allowing to specify an encoding to use for parsing the file
310:             * @return the number of bean definitions found
311:             * @throws BeanDefinitionStoreException in case of loading or parsing errors
312:             */
313:            public int loadBeanDefinitions(EncodedResource encodedResource)
314:                    throws BeanDefinitionStoreException {
315:                Assert.notNull(encodedResource,
316:                        "EncodedResource must not be null");
317:                if (logger.isInfoEnabled()) {
318:                    logger.info("Loading XML bean definitions from "
319:                            + encodedResource.getResource());
320:                }
321:
322:                try {
323:                    InputStream inputStream = encodedResource.getResource()
324:                            .getInputStream();
325:                    try {
326:                        InputSource inputSource = new InputSource(inputStream);
327:                        if (encodedResource.getEncoding() != null) {
328:                            inputSource.setEncoding(encodedResource
329:                                    .getEncoding());
330:                        }
331:                        return doLoadBeanDefinitions(inputSource,
332:                                encodedResource.getResource());
333:                    } finally {
334:                        inputStream.close();
335:                    }
336:                } catch (IOException ex) {
337:                    throw new BeanDefinitionStoreException(
338:                            "IOException parsing XML document from "
339:                                    + encodedResource.getResource(), ex);
340:                }
341:            }
342:
343:            /**
344:             * Load bean definitions from the specified XML file.
345:             * @param inputSource the SAX InputSource to read from
346:             * @return the number of bean definitions found
347:             * @throws BeanDefinitionStoreException in case of loading or parsing errors
348:             */
349:            public int loadBeanDefinitions(InputSource inputSource)
350:                    throws BeanDefinitionStoreException {
351:                return loadBeanDefinitions(inputSource,
352:                        "resource loaded through SAX InputSource");
353:            }
354:
355:            /**
356:             * Load bean definitions from the specified XML file.
357:             * @param inputSource the SAX InputSource to read from
358:             * @param resourceDescription a description of the resource
359:             * (can be <code>null</code> or empty)
360:             * @return the number of bean definitions found
361:             * @throws BeanDefinitionStoreException in case of loading or parsing errors
362:             */
363:            public int loadBeanDefinitions(InputSource inputSource,
364:                    String resourceDescription)
365:                    throws BeanDefinitionStoreException {
366:
367:                return doLoadBeanDefinitions(inputSource,
368:                        new DescriptiveResource(resourceDescription));
369:            }
370:
371:            /**
372:             * Actually load bean definitions from the specified XML file.
373:             * @param inputSource the SAX InputSource to read from
374:             * @param resource the resource descriptor for the XML file
375:             * @return the number of bean definitions found
376:             * @throws BeanDefinitionStoreException in case of loading or parsing errors
377:             */
378:            protected int doLoadBeanDefinitions(InputSource inputSource,
379:                    Resource resource) throws BeanDefinitionStoreException {
380:                try {
381:                    int validationMode = getValidationModeForResource(resource);
382:                    Document doc = this .documentLoader.loadDocument(
383:                            inputSource, getEntityResolver(),
384:                            this .errorHandler, validationMode,
385:                            this .namespaceAware);
386:                    return registerBeanDefinitions(doc, resource);
387:                } catch (BeanDefinitionStoreException ex) {
388:                    throw ex;
389:                } catch (SAXParseException ex) {
390:                    throw new XmlBeanDefinitionStoreException(resource
391:                            .getDescription(), "Line " + ex.getLineNumber()
392:                            + " in XML document from " + resource
393:                            + " is invalid", ex);
394:                } catch (SAXException ex) {
395:                    throw new XmlBeanDefinitionStoreException(resource
396:                            .getDescription(), "XML document from " + resource
397:                            + " is invalid", ex);
398:                } catch (ParserConfigurationException ex) {
399:                    throw new BeanDefinitionStoreException(resource
400:                            .getDescription(),
401:                            "Parser configuration exception parsing XML from "
402:                                    + resource, ex);
403:                } catch (IOException ex) {
404:                    throw new BeanDefinitionStoreException(
405:                            resource.getDescription(),
406:                            "IOException parsing XML document from " + resource,
407:                            ex);
408:                } catch (Throwable ex) {
409:                    throw new BeanDefinitionStoreException(resource
410:                            .getDescription(),
411:                            "Unexpected exception parsing XML document from "
412:                                    + resource, ex);
413:                }
414:            }
415:
416:            /**
417:             * Gets the validation mode for the specified {@link Resource}. If no explicit
418:             * validation mode has been configured then the validation mode is
419:             * {@link #detectValidationMode detected}.
420:             */
421:            private int getValidationModeForResource(Resource resource) {
422:                if (this .validationMode != VALIDATION_AUTO) {
423:                    return this .validationMode;
424:                }
425:                int detectedMode = detectValidationMode(resource);
426:                if (detectedMode != VALIDATION_AUTO) {
427:                    return detectedMode;
428:                }
429:                // Hmm, we didn't get a clear indication... Let's assume XSD,
430:                // since apparently no DTD declaration has been found up until
431:                // detection stopped (before finding the document's root tag).
432:                return VALIDATION_XSD;
433:            }
434:
435:            /**
436:             * Detects which kind of validation to perform on the XML file identified
437:             * by the supplied {@link Resource}. If the
438:             * file has a <code>DOCTYPE</code> definition then DTD validation is used
439:             * otherwise XSD validation is assumed.
440:             */
441:            protected int detectValidationMode(Resource resource) {
442:                if (resource.isOpen()) {
443:                    throw new BeanDefinitionStoreException(
444:                            "Passed-in Resource ["
445:                                    + resource
446:                                    + "] contains an open stream: "
447:                                    + "cannot determine validation mode automatically. Either pass in a Resource "
448:                                    + "that is able to create fresh streams, or explicitly specify the validationMode "
449:                                    + "on your XmlBeanDefinitionReader instance.");
450:                }
451:
452:                InputStream inputStream;
453:                try {
454:                    inputStream = resource.getInputStream();
455:                } catch (IOException ex) {
456:                    throw new BeanDefinitionStoreException(
457:                            "Unable to determine validation mode for ["
458:                                    + resource
459:                                    + "]: cannot open InputStream. "
460:                                    + "Did you attempt to load directly from a SAX InputSource without specifying the "
461:                                    + "validationMode on your XmlBeanDefinitionReader instance?",
462:                            ex);
463:                }
464:
465:                try {
466:                    return this .validationModeDetector
467:                            .detectValidationMode(inputStream);
468:                } catch (IOException ex) {
469:                    throw new BeanDefinitionStoreException(
470:                            "Unable to determine validation mode for ["
471:                                    + resource
472:                                    + "]: an error occurred whilst reading from the InputStream.",
473:                            ex);
474:                }
475:            }
476:
477:            /**
478:             * Register the bean definitions contained in the given DOM document.
479:             * Called by <code>loadBeanDefinitions</code>.
480:             * <p>Creates a new instance of the parser class and invokes
481:             * <code>registerBeanDefinitions</code> on it.
482:             * @param doc the DOM document
483:             * @param resource the resource descriptor (for context information)
484:             * @return the number of bean definitions found
485:             * @throws BeanDefinitionStoreException in case of parsing errors
486:             * @see #loadBeanDefinitions
487:             * @see #setDocumentReaderClass
488:             * @see BeanDefinitionDocumentReader#registerBeanDefinitions
489:             */
490:            public int registerBeanDefinitions(Document doc, Resource resource)
491:                    throws BeanDefinitionStoreException {
492:                // Support old XmlBeanDefinitionParser SPI for backwards-compatibility.
493:                if (this .parserClass != null) {
494:                    XmlBeanDefinitionParser parser = (XmlBeanDefinitionParser) BeanUtils
495:                            .instantiateClass(this .parserClass);
496:                    return parser.registerBeanDefinitions(this , doc, resource);
497:                }
498:                // Read document based on new BeanDefinitionDocumentReader SPI.
499:                BeanDefinitionDocumentReader documentReader = createBeanDefinitionDocumentReader();
500:                int countBefore = getRegistry().getBeanDefinitionCount();
501:                documentReader.registerBeanDefinitions(doc,
502:                        createReaderContext(resource));
503:                return getRegistry().getBeanDefinitionCount() - countBefore;
504:            }
505:
506:            /**
507:             * Create the {@link BeanDefinitionDocumentReader} to use for actually
508:             * reading bean definitions from an XML document.
509:             * <p>Default implementation instantiates the specified "documentReaderClass".
510:             * @see #setDocumentReaderClass
511:             */
512:            protected BeanDefinitionDocumentReader createBeanDefinitionDocumentReader() {
513:                return (BeanDefinitionDocumentReader) BeanUtils
514:                        .instantiateClass(this .documentReaderClass);
515:            }
516:
517:            /**
518:             * Create the {@link XmlReaderContext} to pass over to the document reader.
519:             */
520:            protected XmlReaderContext createReaderContext(Resource resource) {
521:                if (this .namespaceHandlerResolver == null) {
522:                    this .namespaceHandlerResolver = createDefaultNamespaceHandlerResolver();
523:                }
524:                return new XmlReaderContext(resource, this .problemReporter,
525:                        this .eventListener, this .sourceExtractor, this ,
526:                        this .namespaceHandlerResolver);
527:            }
528:
529:            /**
530:             * Create the default implementation of {@link NamespaceHandlerResolver} used if none is specified.
531:             * Default implementation returns an instance of {@link DefaultNamespaceHandlerResolver}.
532:             */
533:            protected NamespaceHandlerResolver createDefaultNamespaceHandlerResolver() {
534:                return new DefaultNamespaceHandlerResolver(getResourceLoader()
535:                        .getClassLoader());
536:            }
537:
538:        }
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