|
1
22 package org.xsocket;
23
24 import java.lang.reflect.Method  ;
25 import java.util.HashMap ;
26 import java.util.List ;
27 import java.util.Map ;
28
29 import javax.management.Attribute ;
30 import javax.management.AttributeList ;
31 import javax.management.AttributeNotFoundException ;
32 import javax.management.DynamicMBean ;
33 import javax.management.InvalidAttributeValueException ;
34 import javax.management.MBeanAttributeInfo ;
35 import javax.management.MBeanException ;
36 import javax.management.MBeanInfo ;
37 import javax.management.ReflectionException ;
38
39
40
48 public final class IntrospectionBasedDynamicBean implements DynamicMBean {
49
50 private Object obj = null;
51
52 private final Map <String , Info > properties = new HashMap <String , Info >();
53
54
59 public IntrospectionBasedDynamicBean(Object obj) {
60 this.obj = obj;
61 }
62
63
64
67 public Object getAttribute(String attribute) throws AttributeNotFoundException , MBeanException , ReflectionException {
68 String methodName = "get" + attribute;
69 try {
70 Method method = getMethod(obj.getClass(), methodName, new Class [0]);
71 method.setAccessible(true);
72 return method.invoke(obj, new Object [0]);
73 } catch (Exception e) {
74 e.printStackTrace();
75 throw new ReflectionException (e);
76 }
77 }
78
79 @SuppressWarnings ("unchecked")
80 private Method getMethod(Class clazz, String methodname, Class [] params) {
81 do {
82 try {
83 Method method = clazz.getDeclaredMethod(methodname, params);
84 method.setAccessible(true);
85 return method;
86 } catch (Exception ignore) { }
87
88 for (Class interf : clazz.getInterfaces()) {
89 getMethod(interf, methodname, params);
90 }
91
92 clazz = clazz.getSuperclass();
93
94 } while (clazz != null);
95
96 return null;
97 }
98
99
100
103 public AttributeList getAttributes(String [] attributes) {
104 AttributeList list = new AttributeList ();
105 for (String attribute : attributes) {
106 try {
107 list.add(new Attribute (attribute, getAttribute(attribute)));
108 } catch (Exception ignore) { }
109 }
110 return list;
111 }
112
113
114
117 public void setAttribute(Attribute attribute) throws AttributeNotFoundException , InvalidAttributeValueException , MBeanException , ReflectionException {
118 String methodName = "set" + attribute.getName();
119
120 Info info = getInfo(attribute.getName());
121
122 try {
123 Method method = getMethod(obj.getClass(), methodName, new Class [] { info.propertyType });
124 method.setAccessible(true);
125 method.invoke(obj, new Object [] { attribute.getValue() });
126 } catch (Exception e) {
127 throw new ReflectionException (e);
128 }
129 }
130
131
132
135 public AttributeList setAttributes(AttributeList attributes) {
136 AttributeList result = new AttributeList ();
137
138 Attribute [] attrs = (Attribute []) attributes.toArray(new Attribute [attributes.size()]);
139 for (Attribute attr : attrs) {
140 try {
141 setAttribute(attr);
142 result.add(new Attribute (attr.getName(), attr.getValue()));
143 } catch (Exception ignore) { }
144 }
145 return result;
146 }
147
148
149
150
153 public Object invoke(String actionName, Object [] params, String [] signature) throws MBeanException , ReflectionException {
154 return null;
156 }
157
158
159
162 public synchronized MBeanInfo getMBeanInfo() {
163
164 analyze(obj);
165
166 String [] attributes = properties.keySet().toArray(new String [properties.size()]);
167 MBeanAttributeInfo [] attrs = new MBeanAttributeInfo [attributes.length];
168 for (int i = 0; i < attrs.length; i++) {
169 attrs[i] = properties.get(attributes[i]).asbMBeanAttributeInfo();
170 }
171
172
173 return new MBeanInfo (
174 obj.getClass().getName(),
175 "",
176 attrs,
177 null, null,
179 null); }
181
182
183 private void analyze(Object obj) {
184 Class clazz = obj.getClass();
185 do {
186 analyzeType(clazz);
187
188 for (Class interf: clazz.getInterfaces()) {
189 analyzeType(interf);
190 }
191
192 clazz = clazz.getSuperclass();
193
194 } while (clazz != null);
195 }
196
197 private void analyzeType(Class clazz) {
198 for (Method method : clazz.getDeclaredMethods()) {
199 String name = method.getName();
200
201 if ((name.length() > 3) && name.startsWith("get")) {
202 if (method.getParameterTypes().length == 0) {
203 Class propertyType = method.getReturnType();
204
205 if(isAcceptedPropertyType(propertyType)) {
206 Info info = getInfo(name.substring(3, name.length()));
207 info.isReadable = true;
208 info.propertyType = propertyType;
209 }
210 }
211 }
212
213 if ((name.length() > 3) && name.startsWith("set")) {
214 if (method.getParameterTypes().length == 1) {
215 Class propertyType = method.getParameterTypes()[0];
216
217 if(isAcceptedPropertyType(propertyType)) {
218 Info info = getInfo(name.substring(3, name.length()));
219 info.isWriteable = true;
220 info.propertyType = propertyType;
221 }
222 }
223 }
224 }
225 }
226
227
228 private Info getInfo(String name) {
229 Info info = properties.get(name);
230 if (info == null) {
231 info = new Info ();
232 info.propertyName = name;
233 info.propertyDescription = "Property " + info.propertyName;
234 properties.put(name, info);
235 }
236 return info;
237 }
238
239
240
241
242 @SuppressWarnings ("unchecked")
243 private boolean isAcceptedPropertyType(Class clazz) {
244 if (clazz.isAssignableFrom(List .class)) {
245 return true;
246 }
247
248 String name = clazz.getName();
249 return name.equals("int")
250 || name.equals("java.lang.Integer")
251 || name.equals("long")
252 || name.equals("java.lang.Long")
253 || name.equals("double")
254 || name.equals("java.lang.Double")
255 || name.equals("boolean")
256 || name.equals("java.lang.Boolean")
257 || name.equals("float")
258 || name.equals("java.lang.String")
259 || name.equals("java.lang.Float");
260 }
261
262
263 private static class Info {
264 String propertyName = null;
265 Class propertyType = null;
266 String propertyDescription = null;
267 boolean isReadable = false;
268 boolean isWriteable = false;
269 boolean isIs = false;
270
271
272 MBeanAttributeInfo asbMBeanAttributeInfo() {
273 return new MBeanAttributeInfo (propertyName, propertyType.getName(), propertyDescription, isReadable, isWriteable, isIs);
274 }
275 }
276 }
277 |
Popular Tags |
Java API By Example, From Geeks To Geeks.