Source Code Cross Referenced for ClassNameLocatorImpl.java in  » Library » Tapestry » org » apache » tapestry » internal » services » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry.internal.services 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // Copyright 2007 The Apache Software Foundation
002:        //
003:        // Licensed under the Apache License, Version 2.0 (the "License");
004:        // you may not use this file except in compliance with the License.
005:        // You may obtain a copy of the License at
006:        //
007:        //     http://www.apache.org/licenses/LICENSE-2.0
008:        //
009:        // Unless required by applicable law or agreed to in writing, software
010:        // distributed under the License is distributed on an "AS IS" BASIS,
011:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012:        // See the License for the specific language governing permissions and
013:        // limitations under the License.
014:
015:        package org.apache.tapestry.internal.services;
016:
017:        import java.io.BufferedInputStream;
018:        import java.io.File;
019:        import java.io.FileNotFoundException;
020:        import java.io.IOException;
021:        import java.io.InputStream;
022:        import java.io.InputStreamReader;
023:        import java.io.LineNumberReader;
024:        import java.io.Reader;
025:        import java.net.JarURLConnection;
026:        import java.net.URL;
027:        import java.net.URLConnection;
028:        import java.util.Collection;
029:        import java.util.Enumeration;
030:        import java.util.jar.JarEntry;
031:        import java.util.jar.JarFile;
032:
033:        import org.apache.tapestry.internal.TapestryInternalUtils;
034:        import org.apache.tapestry.ioc.internal.util.CollectionFactory;
035:        import org.apache.tapestry.ioc.util.Stack;
036:
037:        public class ClassNameLocatorImpl implements  ClassNameLocator {
038:            private static final String CLASS_SUFFIX = ".class";
039:
040:            private final ClassLoader _contextClassLoader = Thread
041:                    .currentThread().getContextClassLoader();
042:
043:            static class Queued {
044:                final URL _packageURL;
045:
046:                final String _packagePath;
047:
048:                public Queued(final URL packageURL, final String packagePath) {
049:                    _packageURL = packageURL;
050:                    _packagePath = packagePath;
051:                }
052:            }
053:
054:            /**
055:             * Synchronization should not be necessary, but perhaps the underlying ClassLoader's are
056:             * sensitive to threading.
057:             */
058:            public synchronized Collection<String> locateClassNames(
059:                    String packageName) {
060:                String packagePath = packageName.replace('.', '/') + "/";
061:
062:                try {
063:                    Collection<String> result = findClassesWithinPath(packagePath);
064:
065:                    return result;
066:
067:                } catch (IOException ex) {
068:                    throw new RuntimeException(ex);
069:                }
070:            }
071:
072:            private Collection<String> findClassesWithinPath(String packagePath)
073:                    throws IOException {
074:                Collection<String> result = CollectionFactory.newList();
075:
076:                Enumeration<URL> urls = _contextClassLoader
077:                        .getResources(packagePath);
078:
079:                while (urls.hasMoreElements()) {
080:                    URL url = urls.nextElement();
081:
082:                    scanURL(packagePath, result, url);
083:                }
084:
085:                return result;
086:            }
087:
088:            private void scanURL(String packagePath,
089:                    Collection<String> componentClassNames, URL url)
090:                    throws IOException {
091:                URLConnection connection = url.openConnection();
092:
093:                JarFile jarFile;
094:
095:                if (connection instanceof  JarURLConnection) {
096:                    jarFile = ((JarURLConnection) connection).getJarFile();
097:                } else {
098:                    jarFile = getAlternativeJarFile(url);
099:                }
100:
101:                if (jarFile != null) {
102:                    scanJarFile(packagePath, componentClassNames, jarFile);
103:                } else if (supportsDirStream(url)) {
104:                    Stack<Queued> queue = CollectionFactory.newStack();
105:
106:                    queue.push(new Queued(url, packagePath));
107:
108:                    while (!queue.isEmpty()) {
109:                        Queued queued = queue.pop();
110:
111:                        scanDirStream(queued._packagePath, queued._packageURL,
112:                                componentClassNames, queue);
113:                    }
114:                } else {
115:                    // Try scanning file system.
116:                    String packageName = packagePath.replace("/", ".");
117:                    if (packageName.endsWith(".")) {
118:                        packageName = packageName.substring(0, packageName
119:                                .length() - 1);
120:                    }
121:                    scanDir(packageName, new File(url.getFile()),
122:                            componentClassNames);
123:                }
124:
125:            }
126:
127:            /**
128:             * Check whether container supports opening a stream on a dir/package to get a list of its
129:             * contents.
130:             * 
131:             * @param packageURL
132:             * @return
133:             */
134:            private boolean supportsDirStream(URL packageURL) {
135:                InputStream is = null;
136:                try {
137:                    is = packageURL.openStream();
138:                    return true;
139:                } catch (FileNotFoundException ex) {
140:                    return false;
141:                } catch (IOException e) {
142:                    return false;
143:                } finally {
144:                    TapestryInternalUtils.close(is);
145:                }
146:            }
147:
148:            private void scanDirStream(String packagePath, URL packageURL,
149:                    Collection<String> componentClassNames, Stack<Queued> queue)
150:                    throws IOException {
151:                InputStream is = null;
152:
153:                try {
154:                    is = new BufferedInputStream(packageURL.openStream());
155:                } catch (FileNotFoundException ex) {
156:                    // This can happen for certain application servers (JBoss 4.0.5 for example), that
157:                    // export part of the exploded WAR for deployment, but leave part (WEB-INF/classes)
158:                    // unexploded.
159:
160:                    return;
161:                }
162:
163:                Reader reader = new InputStreamReader(is);
164:                LineNumberReader lineReader = new LineNumberReader(reader);
165:
166:                String packageName = null;
167:
168:                try {
169:                    while (true) {
170:                        String line = lineReader.readLine();
171:
172:                        if (line == null)
173:                            break;
174:
175:                        if (line.contains("$"))
176:                            continue;
177:
178:                        if (line.endsWith(CLASS_SUFFIX)) {
179:                            if (packageName == null)
180:                                packageName = packagePath.replace('/', '.');
181:
182:                            // packagePath ends with '/', packageName ends with '.'
183:
184:                            String fullClassName = packageName
185:                                    + line.substring(0, line.length()
186:                                            - CLASS_SUFFIX.length());
187:
188:                            componentClassNames.add(fullClassName);
189:
190:                            continue;
191:                        }
192:
193:                        // Either a file or a hidden directory (such as .svn)
194:
195:                        if (line.contains("."))
196:                            continue;
197:
198:                        // The name of a subdirectory.
199:
200:                        URL newURL = new URL(packageURL.toExternalForm() + line
201:                                + "/");
202:                        String newPackagePath = packagePath + line + "/";
203:
204:                        queue.push(new Queued(newURL, newPackagePath));
205:                    }
206:
207:                    lineReader.close();
208:                    lineReader = null;
209:                } finally {
210:                    TapestryInternalUtils.close(lineReader);
211:                }
212:
213:            }
214:
215:            private void scanJarFile(String packagePath,
216:                    Collection<String> componentClassNames, JarFile jarFile)
217:                    throws IOException {
218:                Enumeration<JarEntry> e = jarFile.entries();
219:
220:                while (e.hasMoreElements()) {
221:                    String name = e.nextElement().getName();
222:
223:                    if (!name.startsWith(packagePath))
224:                        continue;
225:
226:                    if (!name.endsWith(CLASS_SUFFIX))
227:                        continue;
228:
229:                    if (name.contains("$"))
230:                        continue;
231:
232:                    // Strip off .class and convert the slashes back to periods.
233:
234:                    String className = name.substring(0,
235:                            name.length() - CLASS_SUFFIX.length()).replace("/",
236:                            ".");
237:
238:                    componentClassNames.add(className);
239:                }
240:            }
241:
242:            /**
243:             * Scan a dir for classes. Will recursively look in the supplied directory and all sub
244:             * directories.
245:             * 
246:             * @param packageName
247:             *            Name of package that this directory corresponds to.
248:             * @param dir
249:             *            Dir to scan for clases.
250:             * @param componentClassNames
251:             *            List of class names that have been found.
252:             */
253:            private void scanDir(String packageName, File dir,
254:                    Collection<String> componentClassNames) {
255:                if (dir.exists() && dir.isDirectory()) {
256:                    for (File file : dir.listFiles()) {
257:                        String fileName = file.getName();
258:                        if (file.isDirectory()) {
259:                            scanDir(packageName + "." + fileName, file,
260:                                    componentClassNames);
261:                        } else if (fileName.endsWith(CLASS_SUFFIX)) {
262:                            String className = packageName
263:                                    + "."
264:                                    + fileName.substring(0, fileName.length()
265:                                            - CLASS_SUFFIX.length());
266:                            componentClassNames.add(className);
267:                        }
268:                    }
269:                }
270:            }
271:
272:            /**
273:             * For URLs to JARs that do not use JarURLConnection - allowed by the servlet spec - attempt to
274:             * produce a JarFile object all the same. Known servlet engines that function like this include
275:             * Weblogic and OC4J. This is not a full solution, since an unpacked WAR or EAR will not have
276:             * JAR "files" as such.
277:             * 
278:             * @param url
279:             *            URL of jar
280:             * @return JarFile or null
281:             * @throws java.io.IOException
282:             *             If error occurs creating jar file
283:             */
284:            private JarFile getAlternativeJarFile(URL url) throws IOException {
285:                String urlFile = url.getFile();
286:                // Trim off any suffix - which is prefixed by "!/" on Weblogic
287:                int separatorIndex = urlFile.indexOf("!/");
288:
289:                // OK, didn't find that. Try the less safe "!", used on OC4J
290:                if (separatorIndex == -1) {
291:                    separatorIndex = urlFile.indexOf('!');
292:                }
293:                if (separatorIndex != -1) {
294:                    String jarFileUrl = urlFile.substring(0, separatorIndex);
295:                    // And trim off any "file:" prefix.
296:                    if (jarFileUrl.startsWith("file:")) {
297:                        jarFileUrl = jarFileUrl.substring("file:".length());
298:                    }
299:                    return new JarFile(jarFileUrl);
300:                }
301:                return null;
302:            }
303:
304:        }
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