|
1
7 package org.jboss.cache;
8
9 import org.jboss.logging.Logger;
10 import org.jboss.util.propertyeditor.ElementEditor;
11 import org.jboss.util.propertyeditor.PropertyEditors;
12 import org.w3c.dom.*;
13 import org.w3c.dom.Node  ;
14 import org.xml.sax.InputSource ;
15 import org.xml.sax.SAXException ;
16 import org.xml.sax.SAXParseException ;
17
18 import javax.xml.parsers.DocumentBuilder ;
19 import javax.xml.parsers.DocumentBuilderFactory ;
20 import java.beans.PropertyEditor ;
21 import java.beans.PropertyEditorManager ;
22 import java.io.InputStream ;
23 import java.io.File ;
24 import java.io.FileInputStream ;
25 import java.io.FileNotFoundException ;
26 import java.lang.reflect.Method ;
27 import java.net.URL ;
28
29
50 public class PropertyConfigurator {
51 private static Logger logger_=Logger.getLogger(PropertyConfigurator.class);
52 private Object objToConfigure_;
53 private static final String ROOT="mbean";
54 private static final String ATTR="attribute";
55 private static final String SUB_ATTR="config";
56 private static final String NAME="name";
57
58 public PropertyConfigurator() {
59 try {
61 Class clasz=Class.forName("org.w3c.dom.Element");
62 Class elementClasz=Class.forName("org.jboss.util.propertyeditor.ElementEditor");
63 try {
64 PropertyEditor editor = PropertyEditors.getEditor(clasz); logger_.info("Found existing property editor for org.w3c.dom.Element: " +editor);
66 } catch (RuntimeException ex) {
67 logger_.info("Property editor for org.w3c.dom.Element does not exist." +
68 " Will register org.jboss.util.propertyeditor.ElementEditor");
69 PropertyEditors.registerEditor(clasz, elementClasz);
70 }
71 }
72 catch(ClassNotFoundException ex) {
73 logger_.error("Class not found for either org.w3c.dom.Element or " +
74 "org.jboss.util.propertyeditor.ElementEditor");
75 }
76 }
77
78 protected Element loadDocument(String location) throws ConfigureException {
79 URL url=null;
80 try {
81 url=new URL ("file", "", 80, location);
83 logger_.debug("URL location is " + url.toString());
84 return loadDocument(url.openStream());
85 }
86 catch(java.net.MalformedURLException mfx) {
87 logger_.error("Configurator error: " + mfx);
88 mfx.printStackTrace();
89 }
90 catch(java.io.IOException e) {
91 logger_.error("Configurator error: " + e);
92 e.printStackTrace();
93 }
94 return null;
95 }
96
97 protected Element loadDocument(InputStream is) throws ConfigureException {
98 Document doc=null;
99 try {
100 InputSource xmlInp=new InputSource (is);
101
102 DocumentBuilderFactory docBuilderFactory=DocumentBuilderFactory.newInstance();
103 DocumentBuilder parser=docBuilderFactory.newDocumentBuilder();
104 doc=parser.parse(xmlInp);
105 Element root=doc.getDocumentElement();
106 root.normalize();
107 return root;
108 }
109 catch(SAXParseException err) {
110 logger_.error("Configurator SAXParse error: " + err.getMessage());
111 err.printStackTrace();
112 }
113 catch(SAXException e) {
114 logger_.error("Configurator SAX error: " + e);
115 e.printStackTrace();
116 }
117 catch(Exception pce) {
118 logger_.error("Configurator general error: " + pce);
119 pce.printStackTrace();
120 }
121 return null;
122 }
123
124 protected Element getMBeanElement(Element root) throws ConfigureException {
125 NodeList list=root.getElementsByTagName(ROOT);
127 if(list == null)
128 throw new ConfigureException("Can't find " + ROOT + " tag");
129
130 if(list.getLength() > 1)
131 throw new ConfigureException("Has multiple " + ROOT + " tag");
132
133 Node node=list.item(0);
134 Element element=null;
135 if(node.getNodeType() == org.w3c.dom.Node.ELEMENT_NODE) {
136 element=(Element)node;
137 }
138 else {
139 throw new ConfigureException("Can't find " + ROOT + " element");
140 }
141 return element;
142 }
143
144
151 public void configure(Object objToConfigure, String configFile) throws ConfigureException {
152 ClassLoader cl=Thread.currentThread().getContextClassLoader();
154 InputStream is=cl.getResourceAsStream(configFile);
155 if(is == null) {
156 try {
157 is=new FileInputStream (configFile);
158 }
159 catch(FileNotFoundException e) {
160 e.printStackTrace();
161 }
162 }
163 if(is == null)
164 throw new ConfigureException("could not find resource " + configFile);
165 configure(objToConfigure, is);
166 }
167
168
175 public void configure(Object objToConfigure, InputStream is) throws ConfigureException {
176 objToConfigure_=objToConfigure;
177
178 if(is == null)
179 throw new ConfigureException("configure(): input stream is null for property xml");
180
181 Element root=loadDocument(is);
182 Element mbeanElement=getMBeanElement(root);
183 NodeList list=mbeanElement.getElementsByTagName(ATTR);
184 logger_.info("configure(): attribute size: " + list.getLength());
185
186 Class objClass=objToConfigure_.getClass();
187 Method [] methods=objClass.getMethods();
188 Class [] string_sig=new Class []{String .class};
189
190 for(int loop=0; loop < list.getLength(); loop++) {
192 Node node=list.item(loop);
193 if(node.getNodeType() != org.w3c.dom.Node.ELEMENT_NODE)
194 continue;
195
196 Element element=(Element)node;
197 String name=element.getAttribute(NAME);
198 String valueStr=getElementContent(element, true);
199 Element valueObj=null;
200 if(valueStr.length() == 0) { valueObj=getSubElementObject(element);
202 }
203 String methodName="set" + name;
204 Object value=null;
205 Method method=null;
206 Object [] args;
207
208
209 try {
211 method=objClass.getMethod(methodName, string_sig);
212 }
213 catch(Exception e) {
214 ;
215 }
216
217 if(method != null) {
218 try {
219 args=new Object []{valueStr};
220 logger_.debug("setting attribute " + name + " to " + valueStr);
221 method.invoke(objToConfigure_, new Object []{valueStr});
222 continue;
223 }
224 catch(Exception ex) {
225 ex.printStackTrace();
226 throw new ConfigureException("configure(): can't invoke " + methodName + " to configure " +
227 "TreeCache properties. Exception: " + ex);
228 }
229 }
230
231
232 for(int i=0; i < methods.length; i++) {
235
237 if(methodName.equals(methods[i].getName())) {
238 method=methods[i];
239 Class [] clz=method.getParameterTypes(); if(clz.length != 1)
241 throw new ConfigureException("Parameter size of " + methodName +
242 " is not 1 but " + clz.length);
243
244 Class classParam=clz[0];
245 PropertyEditor editor=PropertyEditorManager.findEditor(classParam);
248 if(editor == null) {
249 String str="Could not find PropertyEditor for type class " +
250 classParam;
251 throw new ConfigureException(str);
252 }
253
254 if(valueObj != null) { editor.setValue(valueObj);
256 }
257 else {
258 editor.setAsText(valueStr);
259 }
260
261 value=editor.getValue();
262 logger_.debug("Invoking setter method: " + method +
263 " with parameter \"" + value + "\" of type " + value.getClass());
264
265 try {
267 method.invoke(objToConfigure_, new Object []{value});
268 }
269 catch(Exception ex) {
270 ex.printStackTrace();
271 throw new ConfigureException("configure(): Can't invoke set method to configure " +
272 "TreeCache properties. Method name: " + methodName + " exception: " + ex);
273 }
274 }
275 }
276 }
277 }
278
279 private Element getSubElementObject(Element element)
280 throws ConfigureException {
281
282 NodeList nl=element.getChildNodes();
284 for(int i=0; i < nl.getLength(); i++) {
285 Node node=nl.item(i);
286 if(node.getNodeType() == Node.ELEMENT_NODE &&
287 SUB_ATTR.equals( ((Element)node).getTagName() ) ) {
288 return (Element)node;
289 }
290 }
291
292 logger_.debug("getSubElementObject(): " +
293 "element object. Does not exist for " + SUB_ATTR);
294
295 return null;
296 }
297
298 private String getElementContent(Element element, boolean trim)
299 throws ConfigureException {
300 NodeList nl=element.getChildNodes();
301 String attributeText="";
302 for(int i=0; i < nl.getLength(); i++) {
303 Node n=nl.item(i);
304 if(n instanceof Text) {
305 attributeText+=((Text)n).getData();
306 }
307 } if(trim)
309 attributeText=attributeText.trim();
310 return attributeText;
311 }
312
313 public static void main(String [] args) {
314 try {
315 TreeCache cache=new TreeCache();
316 PropertyConfigurator config=new PropertyConfigurator();
317 config.configure(cache, "tree-cache.xml");
318 }
319 catch(Exception ex) {
320 ex.printStackTrace();
321 }
322 }
323 }
324 |
Popular Tags |
Java API By Example, From Geeks To Geeks.