001: /*
002: License $Id: ServletClassLoader.java,v 1.8 2004/04/16 01:30:04 hendriks73 Exp $
003:
004: Copyright (c) 2001-2005 tagtraum industries.
005:
006: LGPL
007: ====
008:
009: jo! is free software; you can redistribute it and/or
010: modify it under the terms of the GNU Lesser General Public
011: License as published by the Free Software Foundation; either
012: version 2.1 of the License, or (at your option) any later version.
013:
014: jo! is distributed in the hope that it will be useful,
015: but WITHOUT ANY WARRANTY; without even the implied warranty of
016: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
017: Lesser General Public License for more details.
018:
019: You should have received a copy of the GNU Lesser General Public
020: License along with this library; if not, write to the Free Software
021: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
022:
023: For LGPL see <http://www.fsf.org/copyleft/lesser.txt>
024:
025:
026: Sun license
027: ===========
028:
029: This release contains software by Sun Microsystems. Therefore
030: the following conditions have to be met, too. They apply to the
031: files
032:
033: - lib/mail.jar
034: - lib/activation.jar
035: - lib/jsse.jar
036: - lib/jcert.jar
037: - lib/jaxp.jar
038: - lib/crimson.jar
039: - lib/servlet.jar
040: - lib/jnet.jar
041: - lib/jaas.jar
042: - lib/jaasmod.jar
043:
044: contained in this release.
045:
046: a. Licensee may not modify the Java Platform
047: Interface (JPI, identified as classes contained within the javax
048: package or any subpackages of the javax package), by creating additional
049: classes within the JPI or otherwise causing the addition to or modification
050: of the classes in the JPI. In the event that Licensee creates any
051: Java-related API and distribute such API to others for applet or
052: application development, you must promptly publish broadly, an accurate
053: specification for such API for free use by all developers of Java-based
054: software.
055:
056: b. Software is confidential copyrighted information of Sun and
057: title to all copies is retained by Sun and/or its licensors. Licensee
058: shall not modify, decompile, disassemble, decrypt, extract, or otherwise
059: reverse engineer Software. Software may not be leased, assigned, or
060: sublicensed, in whole or in part. Software is not designed or intended
061: for use in on-line control of aircraft, air traffic, aircraft navigation
062: or aircraft communications; or in the design, construction, operation or
063: maintenance of any nuclear facility. Licensee warrants that it will not
064: use or redistribute the Software for such purposes.
065:
066: c. Software is provided "AS IS," without a warranty
067: of any kind. ALL EXPRESS OR IMPLIED REPRESENTATIONS AND WARRANTIES,
068: INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
069: PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED.
070:
071: d. This License is effective until terminated. Licensee may
072: terminate this License at any time by destroying all copies of Software.
073: This License will terminate immediately without notice from Sun if Licensee
074: fails to comply with any provision of this License. Upon such termination,
075: Licensee must destroy all copies of Software.
076:
077: e. Software, including technical data, is subject to U.S.
078: export control laws, including the U.S. Export Administration Act and its
079: associated regulations, and may be subject to export or import regulations
080: in other countries. Licensee agrees to comply strictly with all such
081: regulations and acknowledges that it has the responsibility to obtain
082: licenses to export, re-export, or import Software. Software may not be
083: downloaded, or otherwise exported or re-exported (i) into, or to a national
084: or resident of, Cuba, Iraq, Iran, North Korea, Libya, Sudan, Syria or any
085: country to which the U.S. has embargoed goods; or (ii) to anyone on the
086: U.S. Treasury Department's list of Specially Designated Nations or the U.S.
087: Commerce Department's Table of Denial Orders.
088:
089:
090: Feedback
091: ========
092:
093: We encourage your feedback and suggestions and want to use your feedback to
094: improve the Software. Send all such feedback to:
095: <feedback@tagtraum.com>
096:
097: For more information on tagtraum industries and jo!
098: please see <http://www.tagtraum.com/>.
099:
100:
101: */
102: package com.tagtraum.jo.util;
103:
104: import com.tagtraum.framework.util.ExtensionFileFilter;
105: import com.tagtraum.framework.util.PlatformHelper;
106: import com.tagtraum.framework.util.URLHelper;
107:
108: import java.io.File;
109: import java.io.IOException;
110: import java.net.*;
111: import java.util.Enumeration;
112: import java.util.jar.JarEntry;
113: import java.util.jar.JarFile;
114:
115: /**
116: * Classloader for servlets that automatically adds /WEB-INF/classes/ and
117: * /WEB-INF/lib/ to the searchpath.
118: *
119: * @author <a href="mailto:hs@tagtraum.com">Hendrik Schreiber</a>
120: * @version 1.1beta1 $Id: ServletClassLoader.java,v 1.8 2004/04/16 01:30:04 hendriks73 Exp $
121: * @see com.tagtraum.jo.I_JoServletContextPeer
122: */
123: public class ServletClassLoader extends URLClassLoader {
124:
125: /**
126: * Source-Version
127: */
128: public static String vcid = "$Id: ServletClassLoader.java,v 1.8 2004/04/16 01:30:04 hendriks73 Exp $";
129:
130: /**
131: * Constructor.
132: *
133: * @param root root of the web application - either a jar or a dir.
134: */
135: public ServletClassLoader(URL root, ClassLoader cl) {
136: super (new URL[] {}, cl);
137: // is directory
138: if (root.toString().endsWith("/")) {
139: addURLsFromDir(root);
140: } else {
141: addURLsFromJAR(root);
142: }
143: }
144:
145: /**
146: * Constructor.
147: *
148: * @param url urls to add to the classloader
149: * @param cl parent classloader
150: */
151: public ServletClassLoader(URL[] url, ClassLoader cl) {
152: super (url, cl);
153: }
154:
155: /**
156: * Constructor.
157: *
158: * @param cl parent classloader
159: */
160: public ServletClassLoader(ClassLoader cl) {
161: super (new URL[] {}, cl);
162: }
163:
164: /**
165: * Adds /WEB-INF/lib/ and /WEB-INF/classes/ to the searchpath.
166: *
167: * @param aRoot a URL pointing at a directory using the file protocol
168: */
169: private void addURLsFromDir(URL aRoot) {
170: // classes-dir
171: try {
172: addURL(new URL(aRoot, "WEB-INF/classes/"));
173: } catch (MalformedURLException mue) {
174: mue.printStackTrace();
175: }
176:
177: if (aRoot.toString().startsWith("file")) {
178: File dir = new File(PlatformHelper
179: .getOSSpecificPath(URLDecoder.decode(aRoot
180: .getFile())
181: + "WEB-INF/lib/"));
182: File[] theJarFiles = dir.listFiles(new ExtensionFileFilter(
183: ".jar"));
184: for (int i = 0; theJarFiles != null
185: && i < theJarFiles.length; i++) {
186: try {
187: // debug
188: //System.out.println("Adding '" + theJarFiles[i].getAbsoluteFile().toURL() + "' to classpath.");
189: addURL(theJarFiles[i].getAbsoluteFile().toURL());
190: } catch (MalformedURLException mue) {
191: mue.printStackTrace();
192: }
193: }
194: // add zip files also. this is not explicitly defined like this in the spec, but
195: // as there are still files like db2java.zip around, this makes a lot of sense. (rik)
196: File[] zipFiles = dir.listFiles(new ExtensionFileFilter(
197: ".zip"));
198: for (int i = 0; zipFiles != null && i < zipFiles.length; i++) {
199: try {
200: addURL(URLHelper.make(zipFiles[i].toString()));
201: } catch (MalformedURLException mue) {
202: mue.printStackTrace();
203: }
204: }
205: } else {
206: throw new IllegalArgumentException(
207: "Currently archives in '/WEB-INF/lib/' are only accessible over the protocols JAR or FILE.");
208: }
209: // debug
210: //System.out.println("Added URLs: " + toString());
211: }
212:
213: /**
214: * Adds /WEB-INF/lib/ and /WEB-INF/classes/ to the searchpath.
215: *
216: * @param aRoot a URL pointing at a jar file
217: */
218: private void addURLsFromJAR(URL aRoot) {
219: // classes-dir
220: try {
221: addURL(new URL("jar:" + aRoot + "!/WEB-INF/classes/"));
222: } catch (MalformedURLException mue) {
223: mue.printStackTrace();
224: }
225:
226: try {
227: URL theJarURL = new URL("jar:" + aRoot + "!/");
228: JarURLConnection theCon = (JarURLConnection) theJarURL
229: .openConnection();
230: JarFile theJar = theCon.getJarFile();
231: Enumeration e = theJar.entries();
232:
233: while (e.hasMoreElements()) {
234: JarEntry theEntry = (JarEntry) e.nextElement();
235: String theName = theEntry.getName();
236:
237: if (theName.startsWith("WEB-INF/lib/")
238: && !theEntry.isDirectory()) {
239: try {
240: addURL(new URL("jar:" + aRoot + "!/" + theName));
241: } catch (MalformedURLException mue) {
242: mue.printStackTrace();
243: }
244: }
245: }
246: } catch (MalformedURLException mue) {
247: throw new IllegalArgumentException(
248: "Couldn't access jar. Please check your configuration: "
249: + mue.toString());
250: } catch (IOException ioe) {
251: throw new IllegalArgumentException(
252: "Couldn't access jar. Please check your configuration: "
253: + ioe.toString());
254: }
255: }
256:
257: /**
258: * Return the time the class has been last modified.
259: *
260: * @exception ClassNotFoundException if the file for the specified class could not be found.
261: */
262: public long lastModified(Class klass) throws ClassNotFoundException {
263: long lastModified;
264: String resourceName = klass.getName().replace('.', '/')
265: + ".class";
266: URL url = getResource(resourceName);
267: if (url == null)
268: throw new ClassNotFoundException("The classfile for "
269: + klass
270: + " does not exist anymore or is not accessible.");
271: if (url.getProtocol().equals("file")) {
272: File file = new File(url.getFile());
273: lastModified = file.lastModified();
274: if (lastModified == 0L)
275: throw new ClassNotFoundException(
276: "The classfile "
277: + file
278: + " does not exist anymore or is not accessible.");
279: } else {
280: try {
281: URLConnection con = url.openConnection();
282: lastModified = con.getLastModified();
283: } catch (IOException ioe) {
284: throw new ClassNotFoundException(
285: "The classfile "
286: + url
287: + " does not exist anymore or is not accessible: "
288: + ioe);
289: }
290: }
291: // debug
292: //System.out.println("lastModified of " + url + ": " + new Date(lastModified));
293: return lastModified;
294: }
295:
296: /**
297: * Returns a clone of this classloader.
298: */
299: public Object clone() throws CloneNotSupportedException {
300: if (this .getParent() instanceof ServletClassLoader) {
301: ServletClassLoader parentLoader = (ServletClassLoader) ((ServletClassLoader) this
302: .getParent()).clone();
303: return new ServletClassLoader(this .getURLs(), parentLoader);
304: } else {
305: return new ServletClassLoader(this .getURLs(), getParent());
306: }
307: }
308:
309: /**
310: * String representation.
311: */
312: public String toString() {
313: StringBuffer sb = new StringBuffer(getClass().getName()
314: + hashCode() + ": ");
315: URL[] urls = getURLs();
316: for (int i = 0; i < urls.length; i++) {
317: sb.append(urls[i]);
318: if (i + 1 < urls.length)
319: sb.append(", ");
320: }
321: sb.append(System.getProperty("line.separator"));
322: sb.append(getParent().toString());
323: return sb.toString();
324: }
325:
326: }
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