Source Code Cross Referenced for AnnotatedElementMap.java in  » Library » Apache-beehive-1.0.2-src » org » apache » beehive » controls » api » properties » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache beehive 1.0.2 src » org.apache.beehive.controls.api.properties 
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:         * $Header:$
018:         */
019:        package org.apache.beehive.controls.api.properties;
020:
021:        import java.io.IOException;
022:        import java.lang.annotation.Annotation;
023:        import java.lang.annotation.Inherited;
024:        import java.lang.reflect.AnnotatedElement;
025:        import java.lang.reflect.Field;
026:        import java.lang.reflect.Method;
027:
028:        import org.apache.beehive.controls.api.bean.ControlBean;
029:        import org.apache.beehive.controls.api.bean.ControlExtension;
030:        import org.apache.beehive.controls.api.bean.ControlInterface;
031:
032:        /**
033:         * The AnnotatedElementMap represents a read-only PropertyMap where property values are
034:         * derived from Java 5.0 (JSR-175) annotations.
035:         */
036:        public class AnnotatedElementMap extends BaseMap implements 
037:                PropertyMap, java.io.Serializable {
038:            /**
039:             * Creates a new PropertyMap that is initialized based upon the type and annotations
040:             * associated with an AnnotatedElement.
041:             */
042:            public AnnotatedElementMap(AnnotatedElement annotElem) {
043:                if (annotElem instanceof  Class)
044:                    setMapClass((Class) annotElem);
045:                else if (annotElem instanceof  Field)
046:                    setMapClass(((Field) annotElem).getType());
047:                else if (annotElem instanceof  Method) {
048:                    Class mapClass = getMethodMapClass((Method) annotElem);
049:                    setMapClass(mapClass);
050:                } else
051:                    throw new IllegalArgumentException(
052:                            "Unsupported element type: " + annotElem.getClass());
053:
054:                _annotElem = annotElem;
055:            }
056:
057:            // For methods, make sure we find a declaring class that is a valid
058:            // map class. For extended callback methods, we need to walk up a bit
059:            // further in the hierarchy.
060:
061:            Class getMethodMapClass(Method method) {
062:
063:                Class origMapClass = method.getDeclaringClass();
064:                Class mapClass = origMapClass;
065:                while (mapClass != null && !isValidMapClass(mapClass)) {
066:                    mapClass = mapClass.getDeclaringClass();
067:                }
068:                if (mapClass == null) {
069:                    mapClass = origMapClass;
070:                }
071:                return mapClass;
072:            }
073:
074:            boolean isValidMapClass(Class mapClass) {
075:                if (ControlBean.class.isAssignableFrom(mapClass)) {
076:                    return true;
077:                } else {
078:                    if (mapClass.isAnnotation()
079:                            || mapClass
080:                                    .isAnnotationPresent(ControlInterface.class)
081:                            || mapClass
082:                                    .isAnnotationPresent(ControlExtension.class)) {
083:                        return true;
084:                    }
085:                }
086:                return false;
087:            }
088:
089:            /**
090:             * Sets the property specifed by 'key' within this map.
091:             */
092:            public void setProperty(PropertyKey key, Object value) {
093:                throw new IllegalStateException(
094:                        "AnnotatedElementMap is a read-only PropertyMap");
095:            }
096:
097:            /**
098:             * Returns the property value specified by 'key' within this map.
099:             */
100:            public Object getProperty(PropertyKey key) {
101:                if (!isValidKey(key))
102:                    throw new IllegalArgumentException("Key " + key
103:                            + " is not valid for " + _mapClass);
104:
105:                //
106:                // Look for the property value on the associated annotated element
107:                //
108:                Class propertySet = key.getPropertySet();
109:                Annotation annot = _annotElem.getAnnotation(propertySet);
110:                if (annot != null)
111:                    return key.extractValue(annot);
112:
113:                //
114:                // If the property supports inheritance and the annotated element is an interface,
115:                // then we'll search up the ControlInheritance/Extension hierachy to see if it is
116:                // provided higher up the chain.
117:                //
118:                if (propertySet.isAnnotationPresent(Inherited.class)
119:                        && _annotElem instanceof  Class) {
120:                    Class controlIntf = (Class) _annotElem;
121:                    do {
122:                        Class[] super Intfs = controlIntf.getInterfaces();
123:                        controlIntf = null;
124:                        for (int i = 0; i < super Intfs.length; i++) {
125:                            if (super Intfs[i]
126:                                    .isAnnotationPresent(ControlInterface.class)
127:                                    || super Intfs[i]
128:                                            .isAnnotationPresent(ControlExtension.class)) {
129:                                controlIntf = super Intfs[i];
130:                                annot = controlIntf.getAnnotation(propertySet);
131:                                if (annot != null)
132:                                    return key.extractValue(annot);
133:                            }
134:                        }
135:
136:                    } while (controlIntf != null);
137:                }
138:
139:                //
140:                // Call up to superclass for delegation / default value
141:                //
142:                return super .getProperty(key);
143:            }
144:
145:            /**
146:             * Returns true if the PropertyMap contains one or more values for the specified
147:             * PropertySet, false otherwise
148:             */
149:            public boolean containsPropertySet(
150:                    Class<? extends Annotation> propertySet) {
151:                if (_annotElem.isAnnotationPresent(propertySet))
152:                    return true;
153:
154:                //
155:                // Call up to superclass for delegation
156:                //
157:                return super .containsPropertySet(propertySet);
158:            }
159:
160:            /**
161:             * Returns the AnnotatedElement used for PropertyMap values.
162:             */
163:            public AnnotatedElement getAnnotatedElement() {
164:                return _annotElem;
165:            }
166:
167:            /**
168:             * Returns a String version of method argument lists based upon the method argument types
169:             */
170:            private String getMethodArgs(Method m) {
171:                StringBuffer sb = new StringBuffer();
172:                Class[] argTypes = m.getParameterTypes();
173:                for (int i = 0; i < argTypes.length; i++) {
174:                    if (i != 0)
175:                        sb.append(",");
176:                    sb.append(argTypes[i].toString());
177:                }
178:                return sb.toString();
179:            }
180:
181:            /**
182:             * Overrides the standard Serialization writeObject method to compute and store the element
183:             * information in a serializable form.
184:             */
185:            private void writeObject(java.io.ObjectOutputStream out)
186:                    throws IOException {
187:                //
188:                // When serializing, compute sufficient information about the annotated element to
189:                // allow it to be reassociated later in readObject
190:                //
191:                if (_annotElem instanceof  Class) {
192:                    _elemClass = (Class) _annotElem;
193:                    _elemDesc = null; // non required
194:                } else if (_annotElem instanceof  Field) {
195:                    Field f = (Field) _annotElem;
196:                    _elemClass = f.getDeclaringClass();
197:                    _elemDesc = f.getName();
198:                } else if (_annotElem instanceof  Method) {
199:                    Method m = (Method) _annotElem;
200:                    _elemClass = m.getDeclaringClass();
201:                    _elemDesc = m.getName() + "(" + getMethodArgs(m) + ")";
202:                }
203:
204:                out.defaultWriteObject();
205:            }
206:
207:            /**
208:             * Overrides the standard Serialization readObject implementation to reassociated with the
209:             * target AnnotatedElement after deserialization.
210:             */
211:            private void readObject(java.io.ObjectInputStream in)
212:                    throws IOException, ClassNotFoundException {
213:                in.defaultReadObject();
214:
215:                if (_elemDesc == null) // element is a Class
216:                    _annotElem = _elemClass;
217:                else {
218:                    int argsIndex = _elemDesc.indexOf('(');
219:                    if (argsIndex < 0) // element is a Field
220:                    {
221:                        try {
222:                            _annotElem = _elemClass.getDeclaredField(_elemDesc);
223:                        } catch (NoSuchFieldException nsfe) {
224:                            throw new IOException("Unable to locate field "
225:                                    + nsfe);
226:                        }
227:                    } else // element is a method
228:                    {
229:                        String methodName = _elemDesc.substring(0, argsIndex);
230:                        if (_elemDesc.charAt(argsIndex + 1) == ')') {
231:                            // At least handle the null args case quickly
232:                            try {
233:                                _annotElem = _elemClass.getDeclaredMethod(
234:                                        methodName, new Class[] {});
235:                            } catch (NoSuchMethodException nsme) {
236:                                throw new IOException(
237:                                        "Unable to locate method " + _elemDesc);
238:                            }
239:                        } else {
240:                            // Linear search for the rest :(
241:                            String methodArgs = _elemDesc.substring(
242:                                    argsIndex + 1, _elemDesc.length() - 1);
243:                            Method[] methods = _elemClass.getDeclaredMethods();
244:                            for (int i = 0; i < methods.length; i++) {
245:                                if (methods[i].getName().equals(methodName)
246:                                        && getMethodArgs(methods[i]).equals(
247:                                                methodArgs)) {
248:                                    _annotElem = methods[i];
249:                                    break;
250:                                }
251:                            }
252:
253:                            if (_annotElem == null) {
254:                                throw new IOException(
255:                                        "Unable to locate method " + _elemDesc);
256:                            }
257:                        }
258:                    }
259:                }
260:            }
261:
262:            // The AnnotatedElement upon which this PropertyMap is based.  This is marked transient,
263:            // because many Reflection types are not Serializable. 
264:            transient private AnnotatedElement _annotElem;
265:
266:            private Class _elemClass; // Class associated with the annotated element
267:            private String _elemDesc; // Description of the element
268:        }
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