Source Code Cross Referenced for BeanELResolver.java in  » Sevlet-Container » apache-tomcat-6.0.14 » javax » el » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » apache tomcat 6.0.14 » javax.el 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:
018:        package javax.el;
019:
020:        import java.beans.BeanInfo;
021:        import java.beans.FeatureDescriptor;
022:        import java.beans.IntrospectionException;
023:        import java.beans.Introspector;
024:        import java.beans.PropertyDescriptor;
025:        import java.lang.reflect.InvocationTargetException;
026:        import java.lang.reflect.Method;
027:        import java.lang.reflect.Modifier;
028:        import java.util.Arrays;
029:        import java.util.HashMap;
030:        import java.util.Iterator;
031:        import java.util.Map;
032:        import java.util.WeakHashMap;
033:        import java.util.concurrent.ConcurrentHashMap;
034:
035:        public class BeanELResolver extends ELResolver {
036:
037:            private final boolean readOnly;
038:
039:            private final ConcurrentCache<String, BeanProperties> cache = new ConcurrentCache<String, BeanProperties>(
040:                    1000);
041:
042:            public BeanELResolver() {
043:                this .readOnly = false;
044:            }
045:
046:            public BeanELResolver(boolean readOnly) {
047:                this .readOnly = readOnly;
048:            }
049:
050:            public Object getValue(ELContext context, Object base,
051:                    Object property) throws NullPointerException,
052:                    PropertyNotFoundException, ELException {
053:                if (context == null) {
054:                    throw new NullPointerException();
055:                }
056:                if (base == null || property == null) {
057:                    return null;
058:                }
059:
060:                context.setPropertyResolved(true);
061:                Method m = this .property(context, base, property).read(context);
062:                try {
063:                    return m.invoke(base, (Object[]) null);
064:                } catch (IllegalAccessException e) {
065:                    throw new ELException(e);
066:                } catch (InvocationTargetException e) {
067:                    throw new ELException(message(context, "propertyReadError",
068:                            new Object[] { base.getClass().getName(),
069:                                    property.toString() }), e.getCause());
070:                } catch (Exception e) {
071:                    throw new ELException(e);
072:                }
073:            }
074:
075:            public Class<?> getType(ELContext context, Object base,
076:                    Object property) throws NullPointerException,
077:                    PropertyNotFoundException, ELException {
078:                if (context == null) {
079:                    throw new NullPointerException();
080:                }
081:                if (base == null || property == null) {
082:                    return null;
083:                }
084:
085:                context.setPropertyResolved(true);
086:                return this .property(context, base, property).getPropertyType();
087:            }
088:
089:            public void setValue(ELContext context, Object base,
090:                    Object property, Object value) throws NullPointerException,
091:                    PropertyNotFoundException, PropertyNotWritableException,
092:                    ELException {
093:                if (context == null) {
094:                    throw new NullPointerException();
095:                }
096:                if (base == null || property == null) {
097:                    return;
098:                }
099:
100:                context.setPropertyResolved(true);
101:
102:                if (this .readOnly) {
103:                    throw new PropertyNotWritableException(message(context,
104:                            "resolverNotWriteable", new Object[] { base
105:                                    .getClass().getName() }));
106:                }
107:
108:                Method m = this .property(context, base, property)
109:                        .write(context);
110:                try {
111:                    m.invoke(base, value);
112:                } catch (IllegalAccessException e) {
113:                    throw new ELException(e);
114:                } catch (InvocationTargetException e) {
115:                    throw new ELException(message(context,
116:                            "propertyWriteError", new Object[] {
117:                                    base.getClass().getName(),
118:                                    property.toString() }), e.getCause());
119:                } catch (Exception e) {
120:                    throw new ELException(e);
121:                }
122:            }
123:
124:            public boolean isReadOnly(ELContext context, Object base,
125:                    Object property) throws NullPointerException,
126:                    PropertyNotFoundException, ELException {
127:                if (context == null) {
128:                    throw new NullPointerException();
129:                }
130:                if (base == null || property == null) {
131:                    return false;
132:                }
133:
134:                context.setPropertyResolved(true);
135:                return this .readOnly
136:                        || this .property(context, base, property).isReadOnly();
137:            }
138:
139:            public Iterator<FeatureDescriptor> getFeatureDescriptors(
140:                    ELContext context, Object base) {
141:                if (context == null) {
142:                    throw new NullPointerException();
143:                }
144:
145:                if (base == null) {
146:                    return null;
147:                }
148:
149:                try {
150:                    BeanInfo info = Introspector.getBeanInfo(base.getClass());
151:                    PropertyDescriptor[] pds = info.getPropertyDescriptors();
152:                    for (int i = 0; i < pds.length; i++) {
153:                        pds[i]
154:                                .setValue(RESOLVABLE_AT_DESIGN_TIME,
155:                                        Boolean.TRUE);
156:                        pds[i].setValue(TYPE, pds[i].getPropertyType());
157:                    }
158:                    return Arrays.asList((FeatureDescriptor[]) pds).iterator();
159:                } catch (IntrospectionException e) {
160:                    //
161:                }
162:
163:                return null;
164:            }
165:
166:            public Class<?> getCommonPropertyType(ELContext context, Object base) {
167:                if (context == null) {
168:                    throw new NullPointerException();
169:                }
170:
171:                if (base != null) {
172:                    return Object.class;
173:                }
174:
175:                return null;
176:            }
177:
178:            protected final static class BeanProperties {
179:                private final Map<String, BeanProperty> properties;
180:
181:                private final Class<?> type;
182:
183:                public BeanProperties(Class<?> type) throws ELException {
184:                    this .type = type;
185:                    this .properties = new HashMap<String, BeanProperty>();
186:                    try {
187:                        BeanInfo info = Introspector.getBeanInfo(this .type);
188:                        PropertyDescriptor[] pds = info
189:                                .getPropertyDescriptors();
190:                        for (int i = 0; i < pds.length; i++) {
191:                            this .properties.put(pds[i].getName(),
192:                                    new BeanProperty(type, pds[i]));
193:                        }
194:                    } catch (IntrospectionException ie) {
195:                        throw new ELException(ie);
196:                    }
197:                }
198:
199:                private BeanProperty get(ELContext ctx, String name) {
200:                    BeanProperty property = this .properties.get(name);
201:                    if (property == null) {
202:                        throw new PropertyNotFoundException(message(ctx,
203:                                "propertyNotFound", new Object[] {
204:                                        type.getName(), name }));
205:                    }
206:                    return property;
207:                }
208:
209:                public BeanProperty getBeanProperty(String name) {
210:                    return get(null, name);
211:                }
212:
213:                private Class<?> getType() {
214:                    return type;
215:                }
216:            }
217:
218:            protected final static class BeanProperty {
219:                private final Class type;
220:
221:                private final Class owner;
222:
223:                private final PropertyDescriptor descriptor;
224:
225:                private Method read;
226:
227:                private Method write;
228:
229:                public BeanProperty(Class<?> owner,
230:                        PropertyDescriptor descriptor) {
231:                    this .owner = owner;
232:                    this .descriptor = descriptor;
233:                    this .type = descriptor.getPropertyType();
234:                }
235:
236:                public Class getPropertyType() {
237:                    return this .type;
238:                }
239:
240:                public boolean isReadOnly() {
241:                    return this .write == null
242:                            && (null == (this .write = getMethod(this .owner,
243:                                    descriptor.getWriteMethod())));
244:                }
245:
246:                public Method getWriteMethod() {
247:                    return write(null);
248:                }
249:
250:                public Method getReadMethod() {
251:                    return this .read(null);
252:                }
253:
254:                private Method write(ELContext ctx) {
255:                    if (this .write == null) {
256:                        this .write = getMethod(this .owner, descriptor
257:                                .getWriteMethod());
258:                        if (this .write == null) {
259:                            throw new PropertyNotFoundException(message(ctx,
260:                                    "propertyNotWritable", new Object[] {
261:                                            type.getName(),
262:                                            descriptor.getName() }));
263:                        }
264:                    }
265:                    return this .write;
266:                }
267:
268:                private Method read(ELContext ctx) {
269:                    if (this .read == null) {
270:                        this .read = getMethod(this .owner, descriptor
271:                                .getReadMethod());
272:                        if (this .read == null) {
273:                            throw new PropertyNotFoundException(message(ctx,
274:                                    "propertyNotReadable", new Object[] {
275:                                            type.getName(),
276:                                            descriptor.getName() }));
277:                        }
278:                    }
279:                    return this .read;
280:                }
281:            }
282:
283:            private final BeanProperty property(ELContext ctx, Object base,
284:                    Object property) {
285:                Class<?> type = base.getClass();
286:                String prop = property.toString();
287:
288:                BeanProperties props = this .cache.get(type.getName());
289:                if (props == null || type != props.getType()) {
290:                    props = new BeanProperties(type);
291:                    this .cache.put(type.getName(), props);
292:                }
293:
294:                return props.get(ctx, prop);
295:            }
296:
297:            private final static Method getMethod(Class type, Method m) {
298:                if (m == null || Modifier.isPublic(type.getModifiers())) {
299:                    return m;
300:                }
301:                Class[] inf = type.getInterfaces();
302:                Method mp = null;
303:                for (int i = 0; i < inf.length; i++) {
304:                    try {
305:                        mp = inf[i].getMethod(m.getName(), (Class[]) m
306:                                .getParameterTypes());
307:                        mp = getMethod(mp.getDeclaringClass(), mp);
308:                        if (mp != null) {
309:                            return mp;
310:                        }
311:                    } catch (NoSuchMethodException e) {
312:                    }
313:                }
314:                Class sup = type.getSuperclass();
315:                if (sup != null) {
316:                    try {
317:                        mp = sup.getMethod(m.getName(), (Class[]) m
318:                                .getParameterTypes());
319:                        mp = getMethod(mp.getDeclaringClass(), mp);
320:                        if (mp != null) {
321:                            return mp;
322:                        }
323:                    } catch (NoSuchMethodException e) {
324:                    }
325:                }
326:                return null;
327:            }
328:
329:            private final static class ConcurrentCache<K, V> {
330:
331:                private final int size;
332:                private final Map<K, V> eden;
333:                private final Map<K, V> longterm;
334:
335:                public ConcurrentCache(int size) {
336:                    this .size = size;
337:                    this .eden = new ConcurrentHashMap<K, V>(size);
338:                    this .longterm = new WeakHashMap<K, V>(size);
339:                }
340:
341:                public V get(K key) {
342:                    V value = this .eden.get(key);
343:                    if (value == null) {
344:                        value = this .longterm.get(key);
345:                        if (value != null) {
346:                            this .eden.put(key, value);
347:                        }
348:                    }
349:                    return value;
350:                }
351:
352:                public void put(K key, V value) {
353:                    if (this.eden.size() >= this.size) {
354:                        this.longterm.putAll(this.eden);
355:                        this.eden.clear();
356:                    }
357:                    this.eden.put(key, value);
358:                }
359:
360:            }
361:        }
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