Source Code Cross Referenced for PluginClassLoader.java in  » Test-Coverage » salome-tmf » org » objectweb » salome_tmf » plugins » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Test Coverage » salome tmf » org.objectweb.salome_tmf.plugins 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.objectweb.salome_tmf.plugins;
002:
003:        import java.io.File;
004:        import java.io.FileOutputStream;
005:        import java.io.InputStream;
006:        import java.net.URL;
007:        import java.net.URLClassLoader;
008:        import java.net.URLConnection;
009:        import java.util.Hashtable;
010:        import java.util.jar.JarFile;
011:        import java.util.jar.JarInputStream;
012:        import java.util.jar.Manifest;
013:
014:        import org.objectweb.salome_tmf.api.Util;
015:
016:        public class PluginClassLoader extends URLClassLoader {
017:
018:            String tmpDir = System.getProperties()
019:                    .getProperty("java.io.tmpdir");
020:            String fs = System.getProperties().getProperty("file.separator");
021:            String salome_cache = "salome_cache";
022:
023:            boolean useCacheFile = true;
024:            boolean cacheAll = false;
025:            Hashtable loadedJar;
026:
027:            ClassLoader pClassLoader;
028:
029:            /*PluginClassLoader(ClassLoader parent) {
030:             super(new URL[0], parent); 
031:             init();
032:             pClassLoader  = parent; 
033:            }*/
034:
035:            PluginClassLoader(ClassLoader parent) {
036:                super (new URL[] {}, parent);
037:                //ClassLoader.getSystemClassLoader()
038:                init();
039:                pClassLoader = parent;
040:                loadedJar = new Hashtable();
041:            }
042:
043:            void init() {
044:                if (useCacheFile) {
045:                    try {
046:                        cacheAll = create_cache_dir();
047:                    } catch (Exception e) {
048:                        useCacheFile = false;
049:                    }
050:                }
051:
052:            }
053:
054:            public void AddJar(URL jar) {
055:                File f = new File(jar.getFile());
056:                String jarName = f.getName();
057:                if (loadedJar.get(jarName) != null) {
058:                    return;
059:                }
060:                if (useCacheFile) {
061:                    jar = getCachedFile(jar);
062:                }
063:
064:                try {
065:                    Class pclC = pClassLoader.getClass();
066:                    pclC.getMethod("addLocalJar", new Class[] { URL.class })
067:                            .invoke(pClassLoader, new Object[] { jar });
068:                    Util.log("[PluginClassLoader->addJar] load" + jar
069:                            + ", with classloader  " + pClassLoader);
070:                    loadedJar.put(jarName, jar);
071:                } catch (Exception e) {
072:                    try {
073:                        addURL(jar);
074:                        //add(jar);
075:                        loadedJar.put(jarName, jar);
076:                    } catch (Exception e1) {
077:                        addURL(jar);
078:                    }
079:
080:                }
081:            }
082:
083:            /***************************** CORE **************************************/
084:            /*
085:            Hashtable urlsIn = new Hashtable();
086:            private boolean debug = false;
087:
088:            
089:            private boolean alreadyIn(String jarurl){
090:            int slash = jarurl.lastIndexOf('/');// are urls always composed of / ?
091:            String key = jarurl.substring(slash+1);
092:            return (urlsIn.containsKey(key));
093:            }
094:            
095:            
096:            private void registerUrl(URL url){
097:            int slash = url.toString().lastIndexOf('/');// are urls always composed of / ?
098:            String key = url.toString().substring(slash+1);
099:            urlsIn.put(key,url);
100:            }
101:
102:            
103:            public void add(URL url) {
104:            if (!alreadyIn(url.toString())){
105:                super.addURL(url);
106:                registerUrl(url);
107:            }	
108:            }
109:
110:            
111:            public void add(URL[] urls) {
112:            for (int i=0;i<urls.length;i++){
113:                if (!alreadyIn(urls[i].toString())){
114:            	super.addURL(urls[i]);
115:            	registerUrl(urls[i]);
116:                }
117:            }
118:            }
119:
120:            
121:            public void add(String jarurlname) {
122:            URL jarurl = null;
123:            
124:            try {
125:                if ( (jarurlname.startsWith("file:")) ||
126:            	 (jarurlname.startsWith("http:")) ||
127:            	 (jarurlname.startsWith("ftp:"))
128:            	 )
129:            	jarurl = new URL(jarurlname);
130:                else
131:            	jarurl = new URL("file:"+jarurlname);	    		  
132:            } catch (MalformedURLException eurl) {
133:                System.out.println("JarClassLoader Malformed URL "+eurl);
134:            }
135:            if (jarurl != null){
136:                if (!alreadyIn(jarurl.toString())){
137:            	super.addURL(jarurl);
138:            	registerUrl(jarurl);
139:                }
140:            }
141:            }
142:
143:            public Class loadClassFromJar(String name) {
144:            Class c = null;
145:            c = getLoadedClass(name);
146:            if (c!=null)
147:                return c;
148:            try {
149:                c = findClass(name); 
150:            } catch (ClassNotFoundException e) {
151:                if (debug) System.err.println("JarClassLoader loadClassFromJar Exception "+e); 
152:            } catch (NullPointerException ne){
153:                if (debug) System.err.println("JarClassLoader loadClassFromJar Null Exception "+ne);
154:            }
155:            return c;
156:            }
157:            
158:
159:            public Class loadMainClassFromJar(URL jarurl) {
160:            // find main class name in manifest
161:            
162:            // add and register url if not already in
163:            //resetClassLoader();
164:            add(jarurl);
165:
166:            boolean empty = true;
167:            ManifestWrapper mf = null;
168:            byte buffer[] = new byte[1024];
169:            ZipInputStream zis = null;
170:            try {
171:
172:                InputStream inf = jarurl.openStream();
173:                zis = new ZipInputStream(inf);
174:                ZipEntry ent = null;
175:
176:                while ((ent = zis.getNextEntry()) != null) {
177:                    empty = false;
178:
179:            	String name = ent.getName();
180:            	String type = new String();
181:
182:            	
183:            	ByteArrayOutputStream baos = new ByteArrayOutputStream();
184:
185:            	
186:
187:            	for (;;) {
188:            	    int len = zis.read(buffer);
189:            	    if (len < 0) {
190:            		break;
191:            	    }
192:            	    baos.write(buffer, 0, len);
193:            	}
194:
195:            	byte[] buf = baos.toByteArray();
196:            	int size = buf.length;
197:
198:            	if (ManifestWrapper.isManifestName(name)) {
199:            	    type = "manifest/manifest";
200:            	}
201:
202:                    if (type.equals("manifest/manifest")) {
203:            	    mf = new ManifestWrapper(buf);
204:            	}
205:                }
206:
207:            } catch (IOException ex) {
208:                System.out.println("IOException loading archive: " + ex);
209:            } catch (Throwable th) {
210:                System.out.println("Caught " + th + " in loadit()");
211:            } finally {
212:                if (zis != null) {
213:            	try {
214:            	    zis.close();
215:            	} catch (Exception ex) {
216:            	    // ignore
217:            	}
218:                }
219:            }
220:
221:            // Unfortunately ZipInputStream doesn't throw an exception if you hand
222:            // it a non-Zip file.  Our only way of spotting an invalid Jar file
223:            // is if there no ZIP entries.
224:            if (empty) {
225:                System.out.println("jar file empty");
226:
227:                return null;
228:            }
229:
230:            // find class name
231:
232:
233:            if (mf==null)
234:                return null;
235:            String res = null;
236:            //	Vector manifestHeaders = mf.;
237:            for (Enumeration e = mf.entries() ; e.hasMoreElements() ;) {
238:                MessageHeader mh = (MessageHeader)e.nextElement();
239:
240:
241:                res = mh.findValue("Main-Class");
242:                if (res==null) res = mh.findValue("Name");
243:                if (res!=null) break;
244:            }
245:             
246:
247:            if (res==null)
248:                return null;
249:
250:            String name = res;
251:            Class c = null;
252:
253:            c = getLoadedClass(name);
254:            if (c!=null)
255:                return c;
256:
257:            try {
258:                c = findClass(name);
259:            } catch (ClassNotFoundException e) {
260:                if (debug) System.err.println("JarClassLoader loadClassFromJar Exception "+e);
261:            } catch (NullPointerException ne){
262:                if (debug) System.err.println("JarClassLoader loadClassFromJar Null Exception "+ne);
263:            } catch (LinkageError le){
264:                if (debug) System.err.println("JarClassLoader loadClassFromJar Linkage Error "+le);
265:            }
266:            return c;
267:            }
268:
269:
270:
271:            public Class getLoadedClass(String classname){
272:            //return super.findLoadedClass(classname);
273:            Class c = null;
274:            try {
275:                c = super.loadClass(classname);
276:            } catch (ClassNotFoundException e){ 
277:                if (debug) System.err.println("JarClassLoader getLoadedClass Exception "+e); 
278:            }
279:            return c;
280:            }
281:
282:            public void resolvesClass(Class theClass){
283:            try {
284:               super.resolveClass(theClass);
285:            } catch (Exception e){
286:                if (debug) System.err.println("JarClassLoader resolvesClass Exception "+e);
287:            }
288:            }
289:             */
290:
291:            /*************************** CACHE ************************************/
292:
293:            URL getCachedFile(URL jarURL) {
294:                URL fileURL = jarURL;
295:                if (jarURL.getProtocol().equals("file")) {
296:                    return jarURL;
297:                }
298:                //System.out.println("[PluginClassLoader->getCachedFile] for   " +jarURL);
299:                try {
300:                    File f = new File(jarURL.getFile());
301:                    String jarName = f.getName();
302:
303:                    //String urlRemote =  "jar:" +   jarURL.toString() + "!/";
304:                    File fileLocal = new File(tmpDir + fs + salome_cache + fs
305:                            + jarName);
306:                    if (needUpdate(jarURL, fileLocal, jarName)) {
307:                        fileURL = installFile(jarURL, jarName).toURL();
308:
309:                    } else {
310:                        Util
311:                                .log("[PluginClassLoader->getCachedFile] Use cache for   "
312:                                        + jarURL);
313:                        fileURL = fileLocal.toURL();
314:                    }
315:                } catch (Exception e) {
316:
317:                }
318:                //System.out.println("[PluginClassLoader->getCachedFile] set url to use  " +fileURL);
319:                return fileURL;
320:            }
321:
322:            boolean needUpdate(URL pJarURL, File localFile, String name) {
323:                boolean ret = false;
324:                if (!localFile.exists()) {
325:                    //  System.out.println("[PluginClassLoader->needUpdate] Need to Update (not exist) : " + localFile);
326:                    return true;
327:                }
328:                try {
329:                    JarInputStream jarInput = new JarInputStream(pJarURL
330:                            .openStream());
331:                    Manifest remoteManifest = jarInput.getManifest();
332:
333:                    JarFile localeJar = new JarFile(localFile);
334:                    Manifest localManifest = localeJar.getManifest();
335:
336:                    if (!localManifest.equals(remoteManifest)) {
337:                        //System.out.println("[PluginClassLoader->needUpdate] Need to Update : " + localFile);
338:                        ret = true;
339:                    } else {
340:                        // ZipEntry  getEntry(String name) META-INF/SALOME_T.SF
341:                        if (localManifest.getEntries().size() == 0) {
342:                            // System.out.println("[PluginClassLoader->needUpdate] Need to Update " + localFile + " No attribute in manifest") 
343:                            ret = true;
344:                        }
345:                    }
346:
347:                    //System.out.println("JarManifest  = " + manifest + " for " + jar);
348:                } catch (Exception e) {
349:                    e.printStackTrace();
350:                    ret = true;
351:                }
352:                return ret;
353:            }
354:
355:            boolean create_cache_dir() throws Exception {
356:                boolean ret = false;
357:                File file = new File(tmpDir + fs + salome_cache);
358:                if (!file.exists()) {
359:                    file.mkdirs();
360:                    ret = true;
361:                }
362:                return ret;
363:            }
364:
365:            File installFile(URL pUrl, String name) throws Exception {
366:                File file = null;
367:                try {
368:                    URLConnection urlconn = pUrl.openConnection();
369:                    InputStream is = urlconn.getInputStream();
370:                    file = new File(tmpDir + fs + salome_cache + fs + name);
371:                    writeStream(is, file);
372:
373:                } catch (Exception e) {
374:                    e.printStackTrace();
375:                    return null;
376:                }
377:                return file;
378:            }
379:
380:            void writeStream(InputStream is, File f) throws Exception {
381:                byte[] buf = new byte[102400];
382:                f.createNewFile();
383:                FileOutputStream fos = new FileOutputStream(f);
384:                int len = 0;
385:                while ((len = is.read(buf)) != -1) {
386:                    fos.write(buf, 0, len);
387:                }
388:                fos.close();
389:                is.close();
390:            }
391:
392:        }
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