Source Code Cross Referenced for BeanELResolver.java in  » Scripting » JUEL » javax » el » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » JUEL » javax.el 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * The contents of this file are subject to the terms
003:         * of the Common Development and Distribution License
004:         * (the "License").  You may not use this file except
005:         * in compliance with the License.
006:         *
007:         * You can obtain a copy of the license at
008:         * glassfish/bootstrap/legal/CDDLv1.0.txt or
009:         * https://glassfish.dev.java.net/public/CDDLv1.0.html.
010:         * See the License for the specific language governing
011:         * permissions and limitations under the License.
012:         *
013:         * When distributing Covered Code, include this CDDL
014:         * HEADER in each file and include the License file at
015:         * glassfish/bootstrap/legal/CDDLv1.0.txt.  If applicable,
016:         * add the following below this CDDL HEADER, with the
017:         * fields enclosed by brackets "[]" replaced with your
018:         * own identifying information: Portions Copyright [yyyy]
019:         * [name of copyright owner]
020:         *
021:         * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
022:         */
023:
024:        package javax.el;
025:
026:        import java.lang.reflect.InvocationTargetException;
027:        import java.lang.reflect.Method;
028:        import java.lang.reflect.Modifier;
029:        import java.lang.ref.SoftReference;
030:        import java.beans.FeatureDescriptor;
031:        import java.beans.BeanInfo;
032:        import java.beans.Introspector;
033:        import java.beans.PropertyDescriptor;
034:        import java.beans.IntrospectionException;
035:        import java.util.Iterator;
036:        import java.util.ArrayList;
037:        import java.util.Map;
038:        import java.util.HashMap;
039:        import java.util.concurrent.ConcurrentHashMap;
040:
041:        /**
042:         * Defines property resolution behavior on objects using the JavaBeans
043:         * component architecture.
044:         *
045:         * <p>This resolver handles base objects of any type, as long as the
046:         * base is not <code>null</code>. It accepts any object as a property, and
047:         * coerces it to a string. That string is then used to find a JavaBeans
048:         * compliant property on the base object. The value is accessed using
049:         * JavaBeans getters and setters.</p>
050:         * 
051:         * <p>This resolver can be constructed in read-only mode, which means that
052:         * {@link #isReadOnly} will always return <code>true</code> and 
053:         * {@link #setValue} will always throw
054:         * <code>PropertyNotWritableException</code>.</p>
055:         *
056:         * <p><code>ELResolver</code>s are combined together using 
057:         * {@link CompositeELResolver}s, to define rich semantics for evaluating 
058:         * an expression. See the javadocs for {@link ELResolver} for details.</p>
059:         *
060:         * <p>Because this resolver handles base objects of any type, it should
061:         * be placed near the end of a composite resolver. Otherwise, it will
062:         * claim to have resolved a property before any resolvers that come after
063:         * it get a chance to test if they can do so as well.</p>
064:         *
065:         * @see CompositeELResolver
066:         * @see ELResolver
067:         * @since JSP 2.1
068:         */
069:        public class BeanELResolver extends ELResolver {
070:
071:            private boolean isReadOnly;
072:
073:            private static final int CACHE_SIZE = 1024;
074:            private static final ConcurrentHashMap<Class, BeanProperties> properties = new ConcurrentHashMap<Class, BeanProperties>(
075:                    CACHE_SIZE);
076:
077:            /*
078:             * Defines a property for a bean.
079:             */
080:            protected final static class BeanProperty {
081:
082:                private Method readMethod;
083:                private Method writeMethod;
084:                private PropertyDescriptor descriptor;
085:
086:                public BeanProperty(Class<?> baseClass,
087:                        PropertyDescriptor descriptor) {
088:                    this .descriptor = descriptor;
089:                    readMethod = getMethod(baseClass, descriptor
090:                            .getReadMethod());
091:                    writeMethod = getMethod(baseClass, descriptor
092:                            .getWriteMethod());
093:                }
094:
095:                public Class getPropertyType() {
096:                    return descriptor.getPropertyType();
097:                }
098:
099:                public boolean isReadOnly() {
100:                    return getWriteMethod() == null;
101:                }
102:
103:                public Method getReadMethod() {
104:                    return readMethod;
105:                }
106:
107:                public Method getWriteMethod() {
108:                    return writeMethod;
109:                }
110:            }
111:
112:            /*
113:             * Defines the properties for a bean.
114:             */
115:            protected final static class BeanProperties {
116:
117:                private final Map<String, BeanProperty> propertyMap = new HashMap<String, BeanProperty>();
118:
119:                public BeanProperties(Class<?> baseClass) {
120:                    PropertyDescriptor[] descriptors;
121:                    try {
122:                        BeanInfo info = Introspector.getBeanInfo(baseClass);
123:                        descriptors = info.getPropertyDescriptors();
124:                    } catch (IntrospectionException ie) {
125:                        throw new ELException(ie);
126:                    }
127:                    for (PropertyDescriptor pd : descriptors) {
128:                        propertyMap.put(pd.getName(), new BeanProperty(
129:                                baseClass, pd));
130:                    }
131:                }
132:
133:                public BeanProperty getBeanProperty(String property) {
134:                    return propertyMap.get(property);
135:                }
136:            }
137:
138:            /**
139:             * Creates a new read/write <code>BeanELResolver</code>.
140:             */
141:            public BeanELResolver() {
142:                this .isReadOnly = false;
143:            }
144:
145:            /**
146:             * Creates a new <code>BeanELResolver</code> whose read-only status is
147:             * determined by the given parameter.
148:             *
149:             * @param isReadOnly <code>true</code> if this resolver cannot modify
150:             *     beans; <code>false</code> otherwise.
151:             */
152:            public BeanELResolver(boolean isReadOnly) {
153:                this .isReadOnly = isReadOnly;
154:            }
155:
156:            /**
157:             * If the base object is not <code>null</code>, returns the most 
158:             * general acceptable type that can be set on this bean property.
159:             *
160:             * <p>If the base is not <code>null</code>, the 
161:             * <code>propertyResolved</code> property of the <code>ELContext</code>
162:             * object must be set to <code>true</code> by this resolver, before
163:             * returning. If this property is not <code>true</code> after this 
164:             * method is called, the caller should ignore the return value.</p>
165:             *
166:             * <p>The provided property will first be coerced to a <code>String</code>.
167:             * If there is a <code>BeanInfoProperty</code> for this property and
168:             * there were no errors retrieving it, the <code>propertyType</code> of
169:             * the <code>propertyDescriptor</code> is returned. Otherwise, a
170:             * <code>PropertyNotFoundException</code> is thrown.</p>
171:             *
172:             * @param context The context of this evaluation.
173:             * @param base The bean to analyze.
174:             * @param property The name of the property to analyze. Will be coerced to
175:             *     a <code>String</code>.
176:             * @return If the <code>propertyResolved</code> property of 
177:             *     <code>ELContext</code> was set to <code>true</code>, then
178:             *     the most general acceptable type; otherwise undefined.
179:             * @throws NullPointerException if context is <code>null</code>
180:             * @throws PropertyNotFoundException if <code>base</code> is not
181:             *     <code>null</code> and the specified property does not exist
182:             *     or is not readable.
183:             * @throws ELException if an exception was thrown while performing
184:             *     the property or variable resolution. The thrown exception
185:             *     must be included as the cause property of this exception, if
186:             *     available.
187:             */
188:            public Class<?> getType(ELContext context, Object base,
189:                    Object property) {
190:
191:                if (context == null) {
192:                    throw new NullPointerException();
193:                }
194:
195:                if (base == null || property == null) {
196:                    return null;
197:                }
198:
199:                BeanProperty bp = getBeanProperty(context, base, property);
200:                context.setPropertyResolved(true);
201:                return bp.getPropertyType();
202:            }
203:
204:            /**
205:             * If the base object is not <code>null</code>, returns the current
206:             * value of the given property on this bean.
207:             *
208:             * <p>If the base is not <code>null</code>, the 
209:             * <code>propertyResolved</code> property of the <code>ELContext</code>
210:             * object must be set to <code>true</code> by this resolver, before
211:             * returning. If this property is not <code>true</code> after this 
212:             * method is called, the caller should ignore the return value.</p>
213:             *
214:             * <p>The provided property name will first be coerced to a
215:             * <code>String</code>. If the property is a readable property of the 
216:             * base object, as per the JavaBeans specification, then return the 
217:             * result of the getter call. If the getter throws an exception, 
218:             * it is propagated to the caller. If the property is not found or is 
219:             * not readable, a <code>PropertyNotFoundException</code> is thrown.</p>
220:             *
221:             * @param context The context of this evaluation.
222:             * @param base The bean on which to get the property.
223:             * @param property The name of the property to get. Will be coerced to
224:             *     a <code>String</code>.
225:             * @return If the <code>propertyResolved</code> property of 
226:             *     <code>ELContext</code> was set to <code>true</code>, then
227:             *     the value of the given property. Otherwise, undefined.
228:             * @throws NullPointerException if context is <code>null</code>.
229:             * @throws PropertyNotFoundException if <code>base</code> is not
230:             *     <code>null</code> and the specified property does not exist
231:             *     or is not readable.
232:             * @throws ELException if an exception was thrown while performing
233:             *     the property or variable resolution. The thrown exception
234:             *     must be included as the cause property of this exception, if
235:             *     available.
236:             */
237:            public Object getValue(ELContext context, Object base,
238:                    Object property) {
239:
240:                if (context == null) {
241:                    throw new NullPointerException();
242:                }
243:
244:                if (base == null || property == null) {
245:                    return null;
246:                }
247:
248:                BeanProperty bp = getBeanProperty(context, base, property);
249:                Method method = bp.getReadMethod();
250:                if (method == null) {
251:                    throw new PropertyNotFoundException(ELUtil
252:                            .getExceptionMessageString(context,
253:                                    "propertyNotReadable", new Object[] {
254:                                            base.getClass().getName(),
255:                                            property.toString() }));
256:                }
257:
258:                Object value;
259:                try {
260:                    value = method.invoke(base, new Object[0]);
261:                    context.setPropertyResolved(true);
262:                } catch (ELException ex) {
263:                    throw ex;
264:                } catch (InvocationTargetException ite) {
265:                    throw new ELException(ite.getCause());
266:                } catch (Exception ex) {
267:                    throw new ELException(ex);
268:                }
269:                return value;
270:            }
271:
272:            /**
273:             * If the base object is not <code>null</code>, attempts to set the
274:             * value of the given property on this bean.
275:             *
276:             * <p>If the base is not <code>null</code>, the 
277:             * <code>propertyResolved</code> property of the <code>ELContext</code>
278:             * object must be set to <code>true</code> by this resolver, before
279:             * returning. If this property is not <code>true</code> after this 
280:             * method is called, the caller can safely assume no value was set.</p>
281:             *
282:             * <p>If this resolver was constructed in read-only mode, this method will
283:             * always throw <code>PropertyNotWritableException</code>.</p>
284:             *
285:             * <p>The provided property name will first be coerced to a
286:             * <code>String</code>. If property is a writable property of 
287:             * <code>base</code> (as per the JavaBeans Specification), the setter 
288:             * method is called (passing <code>value</code>). If the property exists
289:             * but does not have a setter, then a
290:             * <code>PropertyNotFoundException</code> is thrown. If the property
291:             * does not exist, a <code>PropertyNotFoundException</code> is thrown.</p>
292:             *
293:             * @param context The context of this evaluation.
294:             * @param base The bean on which to set the property.
295:             * @param property The name of the property to set. Will be coerced to
296:             *     a <code>String</code>.
297:             * @param val The value to be associated with the specified key.
298:             * @throws NullPointerException if context is <code>null</code>.
299:             * @throws PropertyNotFoundException if <code>base</code> is not
300:             *     <code>null</code> and the specified property does not exist.
301:             * @throws PropertyNotWritableException if this resolver was constructed
302:             *     in read-only mode, or if there is no setter for the property.
303:             * @throws ELException if an exception was thrown while performing
304:             *     the property or variable resolution. The thrown exception
305:             *     must be included as the cause property of this exception, if
306:             *     available.
307:             */
308:            public void setValue(ELContext context, Object base,
309:                    Object property, Object val) {
310:
311:                if (context == null) {
312:                    throw new NullPointerException();
313:                }
314:
315:                if (base == null || property == null) {
316:                    return;
317:                }
318:
319:                if (isReadOnly) {
320:                    throw new PropertyNotWritableException(ELUtil
321:                            .getExceptionMessageString(context,
322:                                    "resolverNotwritable", new Object[] { base
323:                                            .getClass().getName() }));
324:                }
325:
326:                BeanProperty bp = getBeanProperty(context, base, property);
327:                Method method = bp.getWriteMethod();
328:                if (method == null) {
329:                    throw new PropertyNotWritableException(ELUtil
330:                            .getExceptionMessageString(context,
331:                                    "propertyNotWritable", new Object[] {
332:                                            base.getClass().getName(),
333:                                            property.toString() }));
334:                }
335:
336:                try {
337:                    method.invoke(base, new Object[] { val });
338:                    context.setPropertyResolved(true);
339:                } catch (ELException ex) {
340:                    throw ex;
341:                } catch (InvocationTargetException ite) {
342:                    throw new ELException(ite.getCause());
343:                } catch (Exception ex) {
344:                    if (null == val) {
345:                        val = "null";
346:                    }
347:                    String message = ELUtil.getExceptionMessageString(context,
348:                            "setPropertyFailed", new Object[] {
349:                                    property.toString(),
350:                                    base.getClass().getName(), val });
351:                    throw new ELException(message, ex);
352:                }
353:            }
354:
355:            /**
356:             * If the base object is not <code>null</code>, returns whether a call
357:             * to {@link #setValue} will always fail.
358:             *
359:             * <p>If the base is not <code>null</code>, the 
360:             * <code>propertyResolved</code> property of the <code>ELContext</code>
361:             * object must be set to <code>true</code> by this resolver, before
362:             * returning. If this property is not <code>true</code> after this 
363:             * method is called, the caller can safely assume no value was set.</p>
364:             *
365:             * <p>If this resolver was constructed in read-only mode, this method will
366:             * always return <code>true</code>.</p>
367:             *
368:             * <p>The provided property name will first be coerced to a
369:             * <code>String</code>. If property is a writable property of 
370:             * <code>base</code>, <code>false</code> is returned. If the property is
371:             * found but is not writable, <code>true</code> is returned. If the
372:             * property is not found, a <code>PropertyNotFoundException</code>
373:             * is thrown.</p>
374:             *
375:             * @param context The context of this evaluation.
376:             * @param base The bean to analyze.
377:             * @param property The name of the property to analyzed. Will be coerced to
378:             *     a <code>String</code>.
379:             * @return If the <code>propertyResolved</code> property of 
380:             *     <code>ELContext</code> was set to <code>true</code>, then
381:             *     <code>true</code> if calling the <code>setValue</code> method
382:             *     will always fail or <code>false</code> if it is possible that
383:             *     such a call may succeed; otherwise undefined.
384:             * @throws NullPointerException if context is <code>null</code>
385:             * @throws PropertyNotFoundException if <code>base</code> is not
386:             *     <code>null</code> and the specified property does not exist.
387:             * @throws ELException if an exception was thrown while performing
388:             *     the property or variable resolution. The thrown exception
389:             *     must be included as the cause property of this exception, if
390:             *     available.
391:             */
392:            public boolean isReadOnly(ELContext context, Object base,
393:                    Object property) {
394:
395:                if (context == null) {
396:                    throw new NullPointerException();
397:                }
398:
399:                if (base == null || property == null) {
400:                    return false;
401:                }
402:
403:                context.setPropertyResolved(true);
404:                if (isReadOnly) {
405:                    return true;
406:                }
407:
408:                BeanProperty bp = getBeanProperty(context, base, property);
409:                return bp.isReadOnly();
410:            }
411:
412:            /**
413:             * If the base object is not <code>null</code>, returns an
414:             * <code>Iterator</code> containing the set of JavaBeans properties
415:             * available on the given object. Otherwise, returns <code>null</code>.
416:             *
417:             * <p>The <code>Iterator</code> returned must contain zero or more 
418:             * instances of {@link java.beans.FeatureDescriptor}. Each info object 
419:             * contains information about a property in the bean, as obtained by
420:             * calling the <code>BeanInfo.getPropertyDescriptors</code> method.
421:             * The <code>FeatureDescriptor</code> is initialized using the same
422:             * fields as are present in the <code>PropertyDescriptor</code>,
423:             * with the additional required named attributes "<code>type</code>" and 
424:             * "<code>resolvableAtDesignTime</code>" set as follows:
425:             * <dl>
426:             *     <li>{@link ELResolver#TYPE} - The runtime type of the property, from
427:             *         <code>PropertyDescriptor.getPropertyType()</code>.</li>
428:             *     <li>{@link ELResolver#RESOLVABLE_AT_DESIGN_TIME} - <code>true</code>.</li>
429:             * </dl>
430:             * </p>
431:             * 
432:             * @param context The context of this evaluation.
433:             * @param base The bean to analyze.
434:             * @return An <code>Iterator</code> containing zero or more 
435:             *     <code>FeatureDescriptor</code> objects, each representing a property
436:             *     on this bean, or <code>null</code> if the <code>base</code>
437:             *     object is <code>null</code>.
438:             */
439:            public Iterator<FeatureDescriptor> getFeatureDescriptors(
440:                    ELContext context, Object base) {
441:                if (base == null) {
442:                    return null;
443:                }
444:
445:                BeanInfo info = null;
446:                try {
447:                    info = Introspector.getBeanInfo(base.getClass());
448:                } catch (Exception ex) {
449:                }
450:                if (info == null) {
451:                    return null;
452:                }
453:                ArrayList<FeatureDescriptor> list = new ArrayList<FeatureDescriptor>(
454:                        info.getPropertyDescriptors().length);
455:                for (PropertyDescriptor pd : info.getPropertyDescriptors()) {
456:                    pd.setValue("type", pd.getPropertyType());
457:                    pd.setValue("resolvableAtDesignTime", Boolean.TRUE);
458:                    list.add(pd);
459:                }
460:                return list.iterator();
461:            }
462:
463:            /**
464:             * If the base object is not <code>null</code>, returns the most 
465:             * general type that this resolver accepts for the 
466:             * <code>property</code> argument. Otherwise, returns <code>null</code>.
467:             *
468:             * <p>Assuming the base is not <code>null</code>, this method will always
469:             * return <code>Object.class</code>. This is because any object is
470:             * accepted as a key and is coerced into a string.</p>
471:             *
472:             * @param context The context of this evaluation.
473:             * @param base The bean to analyze.
474:             * @return <code>null</code> if base is <code>null</code>; otherwise
475:             *     <code>Object.class</code>.
476:             */
477:            public Class<?> getCommonPropertyType(ELContext context, Object base) {
478:                if (base == null) {
479:                    return null;
480:                }
481:
482:                return Object.class;
483:            }
484:
485:            /*
486:             * Get a public method form a public class or interface of a given method.
487:             * Note that if a PropertyDescriptor is obtained for a non-public class that
488:             * implements a public interface, the read/write methods will be for the
489:             * class, and therefore inaccessible.  To correct this, a version of the
490:             * same method must be found in a superclass or interface.
491:             **/
492:
493:            static private Method getMethod(Class cl, Method method) {
494:
495:                if (method == null) {
496:                    return null;
497:                }
498:
499:                if (Modifier.isPublic(cl.getModifiers())) {
500:                    return method;
501:                }
502:                Class[] interfaces = cl.getInterfaces();
503:                for (int i = 0; i < interfaces.length; i++) {
504:                    Class c = interfaces[i];
505:                    Method m = null;
506:                    try {
507:                        m = c.getMethod(method.getName(), method
508:                                .getParameterTypes());
509:                        c = m.getDeclaringClass();
510:                        if ((m = getMethod(c, m)) != null)
511:                            return m;
512:                    } catch (NoSuchMethodException ex) {
513:                    }
514:                }
515:                Class c = cl.getSuperclass();
516:                if (c != null) {
517:                    Method m = null;
518:                    try {
519:                        m = c.getMethod(method.getName(), method
520:                                .getParameterTypes());
521:                        c = m.getDeclaringClass();
522:                        if ((m = getMethod(c, m)) != null)
523:                            return m;
524:                    } catch (NoSuchMethodException ex) {
525:                    }
526:                }
527:                return null;
528:            }
529:
530:            private BeanProperty getBeanProperty(ELContext context,
531:                    Object base, Object prop) {
532:
533:                String property = prop.toString();
534:                Class baseClass = base.getClass();
535:                BeanProperties bps = properties.get(baseClass);
536:                if (bps == null) {
537:                    bps = new BeanProperties(baseClass);
538:                    properties.putIfAbsent(baseClass, bps);
539:                }
540:                BeanProperty bp = bps.getBeanProperty(property);
541:                if (bp == null) {
542:                    throw new PropertyNotFoundException(ELUtil
543:                            .getExceptionMessageString(context,
544:                                    "propertyNotFound", new Object[] {
545:                                            baseClass.getName(), property }));
546:                }
547:                return bp;
548:            }
549:
550:            private void removeFromMap(Map<Class, BeanProperties> map,
551:                    ClassLoader classloader) {
552:                Iterator<Class> iter = map.keySet().iterator();
553:                while (iter.hasNext()) {
554:                    Class mbeanClass = iter.next();
555:                    if (classloader.equals(mbeanClass.getClassLoader())) {
556:                        iter.remove();
557:                    }
558:                }
559:
560:            }
561:
562:            /*
563:             * This method is not part of the API, though it can be used (reflectively)
564:             * by clients of this class to remove entries from the cache when the beans
565:             * are being unloaded.
566:             *
567:             * A note about why WeakHashMap is not used.  Measurements has shown 
568:             * that ConcurrentHashMap is much more scalable than synchronized
569:             * WeakHashMap.  A manual purge seems to be a good compromise.
570:             *
571:             * @param classloader The classLoader used to load the beans.
572:             */
573:            private void purgeBeanClasses(ClassLoader classloader) {
574:                removeFromMap(properties, classloader);
575:            }
576:        }
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