svn-gvsig-desktop / trunk / frameworks / _fwAndami / src / com / iver / andami / plugins / PluginClassLoader.java @ 2291
History | View | Annotate | Download (12.7 KB)
1 |
/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
|
---|---|
2 |
*
|
3 |
* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
|
4 |
*
|
5 |
* This program is free software; you can redistribute it and/or
|
6 |
* modify it under the terms of the GNU General Public License
|
7 |
* as published by the Free Software Foundation; either version 2
|
8 |
* of the License, or (at your option) any later version.
|
9 |
*
|
10 |
* This program is distributed in the hope that it will be useful,
|
11 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
12 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
13 |
* GNU General Public License for more details.
|
14 |
*
|
15 |
* You should have received a copy of the GNU General Public License
|
16 |
* along with this program; if not, write to the Free Software
|
17 |
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
|
18 |
*
|
19 |
* For more information, contact:
|
20 |
*
|
21 |
* Generalitat Valenciana
|
22 |
* Conselleria d'Infraestructures i Transport
|
23 |
* Av. Blasco Ib??ez, 50
|
24 |
* 46010 VALENCIA
|
25 |
* SPAIN
|
26 |
*
|
27 |
* +34 963862235
|
28 |
* gvsig@gva.es
|
29 |
* www.gvsig.gva.es
|
30 |
*
|
31 |
* or
|
32 |
*
|
33 |
* IVER T.I. S.A
|
34 |
* Salamanca 50
|
35 |
* 46005 Valencia
|
36 |
* Spain
|
37 |
*
|
38 |
* +34 963163400
|
39 |
* dac@iver.es
|
40 |
*/
|
41 |
package com.iver.andami.plugins; |
42 |
|
43 |
import com.iver.andami.messages.Messages; |
44 |
|
45 |
import org.apache.log4j.Logger; |
46 |
|
47 |
import java.io.DataInputStream; |
48 |
import java.io.File; |
49 |
import java.io.FileInputStream; |
50 |
import java.io.FileNotFoundException; |
51 |
import java.io.IOException; |
52 |
import java.io.InputStream; |
53 |
|
54 |
import java.net.MalformedURLException; |
55 |
import java.net.URL; |
56 |
import java.net.URLClassLoader; |
57 |
|
58 |
import java.security.AllPermission; |
59 |
import java.security.CodeSource; |
60 |
import java.security.PermissionCollection; |
61 |
|
62 |
import java.util.ArrayList; |
63 |
import java.util.Enumeration; |
64 |
import java.util.Hashtable; |
65 |
import java.util.List; |
66 |
import java.util.StringTokenizer; |
67 |
import java.util.jar.JarException; |
68 |
import java.util.zip.ZipEntry; |
69 |
import java.util.zip.ZipException; |
70 |
import java.util.zip.ZipFile; |
71 |
|
72 |
|
73 |
/**
|
74 |
* Class loader que carga las clases pedidas por los plugins de manera que
|
75 |
* primero busca en el classpath, luego busca en el directorio del propio
|
76 |
* plugin en los jars especificados por el xml y en caso de no encontrar la
|
77 |
* clase pide al PluginClassLoaderManager la lista de plugins que pueden
|
78 |
* satisfacer la clase e intenta cargarlo con cada un de ellos hasta que lo
|
79 |
* consigue con uno.
|
80 |
*
|
81 |
* @author Fernando Gonz?lez Cort?s
|
82 |
*/
|
83 |
public class PluginClassLoader extends URLClassLoader { |
84 |
/** DOCUMENT ME! */
|
85 |
private static Logger logger = Logger.getLogger(PluginClassLoader.class.getName()); |
86 |
|
87 |
/** DOCUMENT ME! */
|
88 |
private Hashtable clasesJar = new Hashtable(); |
89 |
|
90 |
/** DOCUMENT ME! */
|
91 |
private File baseDir; |
92 |
private PluginClassLoader[] pluginLoaders; |
93 |
|
94 |
/**
|
95 |
* Creates a new PluginClassLoader object.
|
96 |
*
|
97 |
* @param jars Array con la ruta de los jars en los que buscar? las clases
|
98 |
* el plugin
|
99 |
* @param baseDir Directorio base del plugin que se carga. Es en directorio
|
100 |
* donde se buscan los resources en el m?todo getResources
|
101 |
* @param cl ClassLoader padre del classLoader, al que se le pedir?
|
102 |
* resolver las clases antes de utilizar el algoritmo propio
|
103 |
* @param pluginLoaders DOCUMENT ME!
|
104 |
*
|
105 |
* @throws IOException
|
106 |
*/
|
107 |
public PluginClassLoader(URL[] jars, String baseDir, ClassLoader cl, |
108 |
PluginClassLoader[] pluginLoaders) throws IOException { |
109 |
super(jars, cl);
|
110 |
this.baseDir = new File(new File(baseDir).getAbsolutePath()); |
111 |
this.pluginLoaders = pluginLoaders;
|
112 |
|
113 |
ZipFile[] jarFiles = new ZipFile[jars.length]; |
114 |
|
115 |
for (int i = 0; i < jars.length; i++) { |
116 |
try {
|
117 |
jarFiles[i] = new ZipFile(jars[i].getPath()); |
118 |
|
119 |
Enumeration entradas = jarFiles[i].entries();
|
120 |
|
121 |
while (entradas.hasMoreElements()) {
|
122 |
ZipEntry file = (ZipEntry) entradas.nextElement(); |
123 |
String fileName = file.getName();
|
124 |
|
125 |
if (!fileName.toLowerCase().endsWith(".class")) { //$NON-NLS-1$ |
126 |
|
127 |
continue;
|
128 |
} |
129 |
|
130 |
fileName = fileName.substring(0, fileName.length() - 6) |
131 |
.replace('/', '.'); |
132 |
|
133 |
if (clasesJar.get(fileName) != null) { |
134 |
throw new JarException(Messages.getString( |
135 |
"PluginClassLoader.Dos_clases_con_el_mismo_nombre_en_el_plugin" +
|
136 |
": " + fileName + " en " + |
137 |
jarFiles[i].getName() + " y en " +
|
138 |
((ZipFile) clasesJar.get(fileName)).getName()));
|
139 |
} |
140 |
|
141 |
clasesJar.put(fileName, jarFiles[i]); |
142 |
} |
143 |
} catch (ZipException e) { |
144 |
throw new IOException(e.getMessage() + " Jar: " + |
145 |
jars[i].getPath() + ": " + jarFiles[i]);
|
146 |
} catch (IOException e) { |
147 |
throw e;
|
148 |
} |
149 |
} |
150 |
} |
151 |
|
152 |
/**
|
153 |
* DOCUMENT ME!
|
154 |
*
|
155 |
* @param name DOCUMENT ME!
|
156 |
*
|
157 |
* @return DOCUMENT ME!
|
158 |
*
|
159 |
* @throws ClassNotFoundException DOCUMENT ME!
|
160 |
*/
|
161 |
protected Class singleLoadClass(String name) throws ClassNotFoundException { |
162 |
// Buscamos en las clases de las librer?as del plugin
|
163 |
Class c = findLoadedClass(name);
|
164 |
|
165 |
if (c != null) { |
166 |
return c;
|
167 |
} |
168 |
|
169 |
try {
|
170 |
ZipFile jar = (ZipFile) clasesJar.get(name); |
171 |
|
172 |
//No est? en ning?n jar
|
173 |
if (jar == null) { |
174 |
//Buscamos en el directorio de clases
|
175 |
String classFileName = baseDir + "/classes/" + |
176 |
name.replace('.', '/') + ".class"; |
177 |
File f = new File(classFileName); |
178 |
if (f.exists()){
|
179 |
byte[] data = loadClassData(f); |
180 |
c = defineClass(name, data, 0, data.length);
|
181 |
}else{
|
182 |
//Buscamos en los otros plugins
|
183 |
for (int i = 0; i < pluginLoaders.length; i++) { |
184 |
c = pluginLoaders[i].singleLoadClass(name); |
185 |
|
186 |
if (c != null) { |
187 |
break;
|
188 |
} |
189 |
} |
190 |
} |
191 |
} else {
|
192 |
String fileName = name.replace('.', '/') + ".class"; |
193 |
ZipEntry classFile = jar.getEntry(fileName);
|
194 |
byte[] data = loadClassData(classFile, |
195 |
jar.getInputStream(classFile)); |
196 |
|
197 |
c = defineClass(name, data, 0, data.length);
|
198 |
} |
199 |
|
200 |
if (c == null) { |
201 |
throw new ClassNotFoundException(name); |
202 |
} |
203 |
|
204 |
return c;
|
205 |
} catch (IOException e) { |
206 |
throw new ClassNotFoundException(Messages.getString( |
207 |
"PluginClassLoader.Error_reading_file") + name);
|
208 |
} |
209 |
} |
210 |
|
211 |
/**
|
212 |
* Carga la clase
|
213 |
*
|
214 |
* @param name Nombre de la clase
|
215 |
* @param resolve Si se ha de resolver la clase o no
|
216 |
*
|
217 |
* @return Clase cargada
|
218 |
*
|
219 |
* @throws ClassNotFoundException Si no se pudo encontrar la clase
|
220 |
*/
|
221 |
protected Class loadClass(String name, boolean resolve) |
222 |
throws ClassNotFoundException { |
223 |
Class c = null; |
224 |
|
225 |
// Intentamos cargar con el system classloader
|
226 |
try {
|
227 |
c = super.loadClass(name, resolve);
|
228 |
} catch (ClassNotFoundException e1) { |
229 |
c = singleLoadClass(name); |
230 |
} |
231 |
|
232 |
if (resolve) {
|
233 |
resolveClass(c); |
234 |
} |
235 |
|
236 |
return c;
|
237 |
} |
238 |
|
239 |
/**
|
240 |
* obtiene el array de bytes de la clase
|
241 |
*
|
242 |
* @param classFile Entrada dentro del jar contiene los bytecodes de la
|
243 |
* clase (el .class)
|
244 |
* @param is InputStream para leer la entrada del jar
|
245 |
*
|
246 |
* @return Bytes de la clase
|
247 |
*
|
248 |
* @throws IOException Si no se puede obtener el .class del jar
|
249 |
*/
|
250 |
private byte[] loadClassData(ZipEntry classFile, InputStream is) |
251 |
throws IOException { |
252 |
// Get size of class file
|
253 |
int size = (int) classFile.getSize(); |
254 |
|
255 |
// Reserve space to read
|
256 |
byte[] buff = new byte[size]; |
257 |
|
258 |
// Get stream to read from
|
259 |
DataInputStream dis = new DataInputStream(is); |
260 |
|
261 |
// Read in data
|
262 |
dis.readFully(buff); |
263 |
|
264 |
// close stream
|
265 |
dis.close(); |
266 |
|
267 |
// return data
|
268 |
return buff;
|
269 |
} |
270 |
|
271 |
/**
|
272 |
* Gets the bytes of a File
|
273 |
*
|
274 |
* @param file File
|
275 |
*
|
276 |
* @return bytes of file
|
277 |
*
|
278 |
* @throws IOException If the operation fails
|
279 |
*/
|
280 |
private byte[] loadClassData(File file) throws IOException { |
281 |
InputStream is = new FileInputStream(file); |
282 |
|
283 |
// Get the size of the file
|
284 |
long length = file.length();
|
285 |
|
286 |
// You cannot create an array using a long type.
|
287 |
// It needs to be an int type.
|
288 |
// Before converting to an int type, check
|
289 |
// to ensure that file is not larger than Integer.MAX_VALUE.
|
290 |
if (length > Integer.MAX_VALUE) { |
291 |
// File is too large
|
292 |
} |
293 |
|
294 |
// Create the byte array to hold the data
|
295 |
byte[] bytes = new byte[(int) length]; |
296 |
|
297 |
// Read in the bytes
|
298 |
int offset = 0; |
299 |
int numRead = 0; |
300 |
|
301 |
while ((offset < bytes.length) &&
|
302 |
((numRead = is.read(bytes, offset, bytes.length - offset)) >= 0)) {
|
303 |
offset += numRead; |
304 |
} |
305 |
|
306 |
// Ensure all the bytes have been read in
|
307 |
if (offset < bytes.length) {
|
308 |
throw new IOException("Could not completely read file " + |
309 |
file.getName()); |
310 |
} |
311 |
|
312 |
// Close the input stream and return bytes
|
313 |
is.close(); |
314 |
|
315 |
return bytes;
|
316 |
} |
317 |
|
318 |
/**
|
319 |
* Obtiene los recursos tomando como la raiz el directorio base del plugin.
|
320 |
* Si no se encuentra el recurso ah? se invoca a getResource del
|
321 |
* classloader padre, que buscar? en el jar de la aplicaci?n. Si ah?
|
322 |
* tampoco se encuentra nada se devolver? null.
|
323 |
*
|
324 |
* @param res Nombre del recurso
|
325 |
*
|
326 |
* @return URL del recurso o null si no se pudo encontrar
|
327 |
*/
|
328 |
public URL getResource(String res) { |
329 |
try {
|
330 |
ArrayList resource = new ArrayList(); |
331 |
StringTokenizer st = new StringTokenizer(res, "\\/"); |
332 |
|
333 |
while (st.hasMoreTokens()) {
|
334 |
String token = st.nextToken();
|
335 |
resource.add(token); |
336 |
} |
337 |
|
338 |
URL ret = getResource(baseDir, resource);
|
339 |
|
340 |
if (ret != null) { |
341 |
return ret;
|
342 |
} |
343 |
} catch (Exception e) { |
344 |
e.printStackTrace(); |
345 |
} |
346 |
|
347 |
return super.getResource(res); |
348 |
} |
349 |
|
350 |
/**
|
351 |
* Busca recursivamente el recurso res en el directorio base. res es una
|
352 |
* lista de String's con los directorios del path y base es el directorio
|
353 |
* a partir del cual se busca dicho recurso. En cada ejecuci?n del m?todo
|
354 |
* se toma el primer elemento de res y se busca dicho directorio en el
|
355 |
* directorio base. Si se encuentra, ser? el directorio base para una
|
356 |
* nueva llamada.
|
357 |
*
|
358 |
* @param base Directorio desde donde parte la b?squeda del recurso.
|
359 |
* @param res Lista de strings con el path del recurso que se quiere
|
360 |
* encontrar
|
361 |
*
|
362 |
* @return URL con el recurso
|
363 |
*/
|
364 |
private URL getResource(File base, List res) { |
365 |
File[] files = base.listFiles(); |
366 |
|
367 |
String parte = (String) res.get(0); |
368 |
|
369 |
for (int i = 0; i < files.length; i++) { |
370 |
if (files[i].getName().compareTo(parte) == 0) { |
371 |
if (res.size() == 1) { |
372 |
try {
|
373 |
return new URL("file:" + files[i].toString()); |
374 |
} catch (MalformedURLException e) { |
375 |
return null; |
376 |
} |
377 |
} else {
|
378 |
return getResource(files[i], res.subList(1, res.size())); |
379 |
} |
380 |
} |
381 |
} |
382 |
|
383 |
return null; |
384 |
} |
385 |
|
386 |
/**
|
387 |
* Devuelve el nombre del directorio del plugin
|
388 |
*
|
389 |
* @return
|
390 |
*/
|
391 |
public String getPluginName() { |
392 |
String ret = baseDir.getAbsolutePath().substring(baseDir.getAbsolutePath()
|
393 |
.lastIndexOf(File.separatorChar) +
|
394 |
1);
|
395 |
|
396 |
return ret;
|
397 |
} |
398 |
|
399 |
/**
|
400 |
* @see java.security.SecureClassLoader#getPermissions(java.security.CodeSource)
|
401 |
*/
|
402 |
protected PermissionCollection getPermissions(CodeSource codesource) { |
403 |
PermissionCollection perms = super.getPermissions(codesource); |
404 |
perms.add(new AllPermission()); |
405 |
|
406 |
return perms;
|
407 |
} |
408 |
|
409 |
/**
|
410 |
* DOCUMENT ME!
|
411 |
*
|
412 |
* @return Returns the baseDir.
|
413 |
*/
|
414 |
public String getBaseDir() { |
415 |
return baseDir.getAbsolutePath();
|
416 |
} |
417 |
} |