Source Code Cross Referenced for ManagedBeanBuilder.java in  » J2EE » myfaces-core-1.2.0 » org » apache » myfaces » config » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » myfaces core 1.2.0 » org.apache.myfaces.config 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2004 The Apache Software Foundation.
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:        package org.apache.myfaces.config;
017:
018:        import java.lang.reflect.Array;
019:        import java.lang.reflect.InvocationTargetException;
020:        import java.util.ArrayList;
021:        import java.util.HashMap;
022:        import java.util.Iterator;
023:        import java.util.List;
024:        import java.util.Map;
025:
026:        import javax.el.ELContext;
027:        import javax.el.ELException;
028:        import javax.el.ELResolver;
029:        import javax.el.ExpressionFactory;
030:        import javax.el.ValueExpression;
031:        import javax.faces.FacesException;
032:        import javax.faces.application.Application;
033:        import javax.faces.context.ExternalContext;
034:        import javax.faces.context.FacesContext;
035:        import javax.faces.webapp.UIComponentTag;
036:        import javax.naming.NamingException;
037:
038:        import org.apache.commons.beanutils.PropertyUtils;
039:        import org.apache.commons.logging.Log;
040:        import org.apache.commons.logging.LogFactory;
041:        import org.apache.myfaces.config.annotation.LifecycleProviderFactory;
042:        import org.apache.myfaces.config.annotation.LifecycleProvider;
043:        import org.apache.myfaces.config.element.ListEntries;
044:        import org.apache.myfaces.config.element.ListEntry;
045:        import org.apache.myfaces.config.element.ManagedBean;
046:        import org.apache.myfaces.config.element.ManagedProperty;
047:        import org.apache.myfaces.config.element.MapEntries;
048:        import org.apache.myfaces.config.element.MapEntry;
049:        import org.apache.myfaces.shared_impl.util.ClassUtils;
050:
051:        /**
052:         * Create and initialize managed beans
053:         *
054:         * @author <a href="mailto:oliver@rossmueller.com">Oliver Rossmueller</a> (latest modification by $Author: bommel $)
055:         * @author Anton Koinov
056:         */
057:        public class ManagedBeanBuilder {
058:            private static Log log = LogFactory
059:                    .getLog(ManagedBeanBuilder.class);
060:            private RuntimeConfig _runtimeConfig;
061:            public final static String REQUEST = "request";
062:            public final static String APPLICATION = "application";
063:            public final static String SESSION = "session";
064:            public final static String NONE = "none";
065:
066:            public Object buildManagedBean(FacesContext facesContext,
067:                    ManagedBean beanConfiguration) throws FacesException {
068:
069:                /*final AnnotatedManagedBeanHandler handler = new AnnotatedManagedBeanHandler(bean,
070:                          beanConfiguration.getManagedBeanScope(), beanConfiguration.getManagedBeanName());
071:
072:                  final boolean threwUnchecked = handler.invokePostConstruct();
073:
074:                  if(threwUnchecked)
075:                      return null;*/
076:                try {
077:                    LifecycleProvider lifecycleProvider = LifecycleProviderFactory
078:                            .getLifecycleProviderFactory()
079:                            .getLifecycleProvider(
080:                                    facesContext.getExternalContext());
081:                    final Object bean = lifecycleProvider
082:                            .newInstance(beanConfiguration
083:                                    .getManagedBeanClassName());
084:
085:                    switch (beanConfiguration.getInitMode()) {
086:                    case ManagedBean.INIT_MODE_PROPERTIES:
087:                        try {
088:                            initializeProperties(facesContext,
089:                                    beanConfiguration.getManagedProperties(),
090:                                    beanConfiguration.getManagedBeanScope(),
091:                                    bean);
092:                        } catch (IllegalArgumentException e) {
093:                            throw new IllegalArgumentException(
094:                                    e.getMessage()
095:                                            + " for bean '"
096:                                            + beanConfiguration
097:                                                    .getManagedBeanName()
098:                                            + "' check the configuration to make sure all properties correspond with get/set methods",
099:                                    e);
100:                        }
101:                        break;
102:
103:                    case ManagedBean.INIT_MODE_MAP:
104:                        if (!(bean instanceof  Map)) {
105:                            throw new IllegalArgumentException("Class "
106:                                    + bean.getClass().getName()
107:                                    + " of managed bean "
108:                                    + beanConfiguration.getManagedBeanName()
109:                                    + " is not a Map.");
110:                        }
111:                        initializeMap(facesContext, beanConfiguration
112:                                .getMapEntries(), (Map) bean);
113:                        break;
114:
115:                    case ManagedBean.INIT_MODE_LIST:
116:                        if (!(bean instanceof  List)) {
117:                            throw new IllegalArgumentException("Class "
118:                                    + bean.getClass().getName()
119:                                    + " of managed bean "
120:                                    + beanConfiguration.getManagedBeanName()
121:                                    + " is not a List.");
122:                        }
123:                        initializeList(facesContext, beanConfiguration
124:                                .getListEntries(), (List) bean);
125:                        break;
126:
127:                    case ManagedBean.INIT_MODE_NO_INIT:
128:                        // no init values
129:                        break;
130:
131:                    default:
132:                        throw new IllegalStateException(
133:                                "Unknown managed bean type "
134:                                        + bean.getClass().getName()
135:                                        + " for managed bean "
136:                                        + beanConfiguration
137:                                                .getManagedBeanName() + '.');
138:                    }
139:                    return bean;
140:                } catch (IllegalAccessException e) {
141:                    throw new FacesException(e);
142:                } catch (InvocationTargetException e) {
143:                    throw new FacesException(e);
144:                } catch (NamingException e) {
145:                    throw new FacesException(e);
146:                } catch (ClassNotFoundException e) {
147:                    throw new FacesException(e);
148:                } catch (InstantiationException e) {
149:                    throw new FacesException(e);
150:                }
151:
152:            }
153:
154:            private void initializeProperties(FacesContext facesContext,
155:                    Iterator managedProperties, String targetScope, Object bean) {
156:                ELResolver elResolver = facesContext.getApplication()
157:                        .getELResolver();
158:                ELContext elContext = facesContext.getELContext();
159:
160:                while (managedProperties.hasNext()) {
161:                    ManagedProperty property = (ManagedProperty) managedProperties
162:                            .next();
163:                    Object value = null;
164:
165:                    switch (property.getType()) {
166:                    case ManagedProperty.TYPE_LIST:
167:
168:                        // JSF 1.1, 5.3.1.3
169:                        // Call the property getter, if it exists.
170:                        // If the getter returns null or doesn't exist, create a java.util.ArrayList,
171:                        // otherwise use the returned Object ...
172:                        if (PropertyUtils.isReadable(bean, property
173:                                .getPropertyName()))
174:                            value = elResolver.getValue(elContext, bean,
175:                                    property.getPropertyName());
176:                        value = value == null ? new ArrayList() : value;
177:
178:                        if (value instanceof  List) {
179:                            initializeList(facesContext, property
180:                                    .getListEntries(), (List) value);
181:
182:                        } else if (value != null && value.getClass().isArray()) {
183:                            int length = Array.getLength(value);
184:                            ArrayList temp = new ArrayList(length);
185:                            for (int i = 0; i < length; i++) {
186:                                temp.add(Array.get(value, i));
187:                            }
188:                            initializeList(facesContext, property
189:                                    .getListEntries(), temp);
190:                            value = Array.newInstance(value.getClass()
191:                                    .getComponentType(), temp.size());
192:                            length = temp.size();
193:
194:                            for (int i = 0; i < length; i++) {
195:                                Array.set(value, i, temp.get(i));
196:                            }
197:                        } else {
198:                            value = new ArrayList();
199:                            initializeList(facesContext, property
200:                                    .getListEntries(), (List) value);
201:                        }
202:
203:                        break;
204:                    case ManagedProperty.TYPE_MAP:
205:
206:                        // JSF 1.1, 5.3.1.3
207:                        // Call the property getter, if it exists.
208:                        // If the getter returns null or doesn't exist, create a java.util.HashMap,
209:                        // otherwise use the returned java.util.Map .
210:                        if (PropertyUtils.isReadable(bean, property
211:                                .getPropertyName()))
212:                            value = elResolver.getValue(elContext, bean,
213:                                    property.getPropertyName());
214:                        value = value == null ? new HashMap() : value;
215:
216:                        if (!(value instanceof  Map)) {
217:                            value = new HashMap();
218:                        }
219:
220:                        initializeMap(facesContext, property.getMapEntries(),
221:                                (Map) value);
222:                        break;
223:                    case ManagedProperty.TYPE_NULL:
224:                        value = null;
225:                        break;
226:                    case ManagedProperty.TYPE_VALUE:
227:                        // check for correct scope of a referenced bean
228:                        if (!isInValidScope(facesContext, property, targetScope)) {
229:                            throw new FacesException(
230:                                    "Property "
231:                                            + property.getPropertyName()
232:                                            + " references object in a scope with shorter lifetime than the target scope "
233:                                            + targetScope);
234:                        }
235:                        value = property.getRuntimeValue(facesContext);
236:                        break;
237:                    }
238:                    Class propertyClass = null;
239:
240:                    if (property.getPropertyClass() == null) {
241:                        propertyClass = elResolver.getType(elContext, bean,
242:                                property.getPropertyName());
243:                    } else {
244:                        propertyClass = ClassUtils
245:                                .simpleJavaTypeToClass(property
246:                                        .getPropertyClass());
247:                    }
248:                    if (null == propertyClass) {
249:                        throw new IllegalArgumentException(
250:                                "unable to find the type of property "
251:                                        + property.getPropertyName());
252:                    }
253:                    Object coercedValue = coerceToType(facesContext, value,
254:                            propertyClass);
255:                    elResolver.setValue(elContext, bean, property
256:                            .getPropertyName(), coercedValue);
257:                }
258:            }
259:
260:            // We no longer use the convertToType from shared impl because we switched
261:            // to unified EL in JSF 1.2
262:            public static Object coerceToType(FacesContext facesContext,
263:                    Object value, Class desiredClass) {
264:                if (value == null)
265:                    return null;
266:
267:                try {
268:                    ExpressionFactory expFactory = facesContext
269:                            .getApplication().getExpressionFactory();
270:                    // Use coersion implemented by JSP EL for consistency with EL
271:                    // expressions. Additionally, it caches some of the coersions.
272:                    return expFactory.coerceToType(value, desiredClass);
273:                } catch (ELException e) {
274:                    String message = "Cannot coerce "
275:                            + value.getClass().getName() + " to "
276:                            + desiredClass.getName();
277:                    log.error(message, e);
278:                    throw new FacesException(message, e);
279:                }
280:            }
281:
282:            /**
283:             * Check if the scope of the property value is valid for a bean to be stored in targetScope.
284:             *
285:             * @param facesContext
286:             * @param property     the property to be checked
287:             * @param targetScope  name of the target scope of the bean under construction
288:             */
289:            private boolean isInValidScope(FacesContext facesContext,
290:                    ManagedProperty property, String targetScope) {
291:                if (!property.isValueReference()) {
292:                    // no value reference but a literal value -> nothing to check
293:                    return true;
294:                }
295:                String[] expressions = extractExpressions(property
296:                        .getValueBinding(facesContext).getExpressionString());
297:
298:                for (int i = 0; i < expressions.length; i++) {
299:                    String expression = expressions[i];
300:                    if (expression == null) {
301:                        continue;
302:                    }
303:
304:                    String valueScope = getScope(facesContext, expression);
305:
306:                    // if the target scope is 'none' value scope has to be 'none', too
307:                    if (targetScope == null
308:                            || targetScope.equalsIgnoreCase(NONE)) {
309:                        if (valueScope != null
310:                                && !(valueScope.equalsIgnoreCase(NONE))) {
311:                            return false;
312:                        }
313:                        return true;
314:                    }
315:
316:                    // 'application' scope can reference 'application' and 'none'
317:                    if (targetScope.equalsIgnoreCase(APPLICATION)) {
318:                        if (valueScope != null) {
319:                            if (valueScope.equalsIgnoreCase(REQUEST)
320:                                    || valueScope.equalsIgnoreCase(SESSION)) {
321:                                return false;
322:                            }
323:                        }
324:                        return true;
325:                    }
326:
327:                    // 'session' scope can reference 'session', 'application', and 'none' but not 'request'
328:                    if (targetScope.equalsIgnoreCase(SESSION)) {
329:                        if (valueScope != null) {
330:                            if (valueScope.equalsIgnoreCase(REQUEST)) {
331:                                return false;
332:                            }
333:                        }
334:                        return true;
335:                    }
336:
337:                    // 'request' scope can reference any value scope
338:                    if (targetScope.equalsIgnoreCase(REQUEST)) {
339:                        return true;
340:                    }
341:                }
342:                return false;
343:            }
344:
345:            private String getScope(FacesContext facesContext, String expression) {
346:                String beanName = getFirstSegment(expression);
347:                ExternalContext externalContext = facesContext
348:                        .getExternalContext();
349:
350:                // check scope objects
351:                if (beanName.equalsIgnoreCase("requestScope")) {
352:                    return REQUEST;
353:                }
354:                if (beanName.equalsIgnoreCase("sessionScope")) {
355:                    return SESSION;
356:                }
357:                if (beanName.equalsIgnoreCase("applicationScope")) {
358:                    return APPLICATION;
359:                }
360:
361:                // check implicit objects
362:                if (beanName.equalsIgnoreCase("cookie")) {
363:                    return REQUEST;
364:                }
365:                if (beanName.equalsIgnoreCase("facesContext")) {
366:                    return REQUEST;
367:                }
368:
369:                if (beanName.equalsIgnoreCase("header")) {
370:                    return REQUEST;
371:                }
372:                if (beanName.equalsIgnoreCase("headerValues")) {
373:                    return REQUEST;
374:                }
375:
376:                if (beanName.equalsIgnoreCase("initParam")) {
377:                    return APPLICATION;
378:                }
379:                if (beanName.equalsIgnoreCase("param")) {
380:                    return REQUEST;
381:                }
382:                if (beanName.equalsIgnoreCase("paramValues")) {
383:                    return REQUEST;
384:                }
385:                if (beanName.equalsIgnoreCase("view")) {
386:                    return REQUEST;
387:                }
388:
389:                // not found so far - check all scopes
390:                if (externalContext.getRequestMap().get(beanName) != null) {
391:                    return REQUEST;
392:                }
393:                if (externalContext.getSessionMap().get(beanName) != null) {
394:                    return SESSION;
395:                }
396:                if (externalContext.getApplicationMap().get(beanName) != null) {
397:                    return APPLICATION;
398:                }
399:
400:                //not found - check mangaged bean config
401:
402:                ManagedBean mbc = getRuntimeConfig(facesContext)
403:                        .getManagedBean(beanName);
404:
405:                if (mbc != null) {
406:                    return mbc.getManagedBeanScope();
407:                }
408:
409:                return null;
410:            }
411:
412:            /**
413:             * Extract the first expression segment, that is the substring up to the first '.' or '['
414:             *
415:             * @param expression
416:             * @return first segment of the expression
417:             */
418:            private String getFirstSegment(String expression) {
419:                int indexDot = expression.indexOf('.');
420:                int indexBracket = expression.indexOf('[');
421:
422:                if (indexBracket < 0) {
423:
424:                    return indexDot < 0 ? expression : expression.substring(0,
425:                            indexDot);
426:
427:                }
428:
429:                if (indexDot < 0) {
430:                    return expression.substring(0, indexBracket);
431:                }
432:
433:                return expression
434:                        .substring(0, Math.min(indexDot, indexBracket));
435:
436:            }
437:
438:            private String[] extractExpressions(String expressionString) {
439:                String[] expressions = expressionString.split("\\#\\{");
440:                for (int i = 0; i < expressions.length; i++) {
441:                    String expression = expressions[i];
442:                    if (expression.trim().length() == 0) {
443:                        expressions[i] = null;
444:                    } else {
445:                        int index = expression.indexOf('}');
446:                        expressions[i] = expression.substring(0, index);
447:                    }
448:                }
449:                return expressions;
450:            }
451:
452:            private void initializeMap(FacesContext facesContext,
453:                    MapEntries mapEntries, Map map) {
454:                Application application = facesContext.getApplication();
455:                Class keyClass = (mapEntries.getKeyClass() == null) ? String.class
456:                        : ClassUtils.simpleJavaTypeToClass(mapEntries
457:                                .getKeyClass());
458:                Class valueClass = (mapEntries.getValueClass() == null) ? String.class
459:                        : ClassUtils.simpleJavaTypeToClass(mapEntries
460:                                .getValueClass());
461:                ValueExpression valueExpression;
462:                ExpressionFactory expFactory = application
463:                        .getExpressionFactory();
464:                ELContext elContext = facesContext.getELContext();
465:
466:                for (Iterator iterator = mapEntries.getMapEntries(); iterator
467:                        .hasNext();) {
468:                    MapEntry entry = (MapEntry) iterator.next();
469:                    Object key = entry.getKey();
470:
471:                    if (UIComponentTag.isValueReference((String) key)) {
472:                        valueExpression = expFactory.createValueExpression(
473:                                elContext, (String) key, Object.class);
474:                        key = valueExpression.getValue(elContext);
475:                    }
476:
477:                    if (entry.isNullValue()) {
478:                        map
479:                                .put(coerceToType(facesContext, key, keyClass),
480:                                        null);
481:                    } else {
482:                        Object value = entry.getValue();
483:                        if (UIComponentTag.isValueReference((String) value)) {
484:                            valueExpression = expFactory.createValueExpression(
485:                                    elContext, (String) value, Object.class);
486:                            value = valueExpression.getValue(elContext);
487:                        }
488:                        map.put(coerceToType(facesContext, key, keyClass),
489:                                coerceToType(facesContext, value, valueClass));
490:                    }
491:                }
492:            }
493:
494:            private void initializeList(FacesContext facesContext,
495:                    ListEntries listEntries, List list) {
496:                Application application = facesContext.getApplication();
497:                Class valueClass = listEntries.getValueClass() == null ? String.class
498:                        : ClassUtils.simpleJavaTypeToClass(listEntries
499:                                .getValueClass());
500:                ExpressionFactory expFactory = application
501:                        .getExpressionFactory();
502:                ELContext elContext = facesContext.getELContext();
503:
504:                for (Iterator iterator = listEntries.getListEntries(); iterator
505:                        .hasNext();) {
506:                    ListEntry entry = (ListEntry) iterator.next();
507:                    if (entry.isNullValue()) {
508:                        list.add(null);
509:                    } else {
510:                        Object value = entry.getValue();
511:                        if (UIComponentTag.isValueReference((String) value)) {
512:                            ValueExpression valueExpression = expFactory
513:                                    .createValueExpression(elContext,
514:                                            (String) value, Object.class);
515:                            value = valueExpression.getValue(elContext);
516:                        }
517:                        list.add(coerceToType(facesContext, value, valueClass));
518:                    }
519:                }
520:            }
521:
522:            private RuntimeConfig getRuntimeConfig(FacesContext facesContext) {
523:                if (_runtimeConfig == null) {
524:                    _runtimeConfig = RuntimeConfig
525:                            .getCurrentInstance(facesContext
526:                                    .getExternalContext());
527:                }
528:                return _runtimeConfig;
529:            }
530:        }
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