Source Code Cross Referenced for jlink.java in  » Build » ANT » org » apache » tools » ant » taskdefs » optional » jlink » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Build » ANT » org.apache.tools.ant.taskdefs.optional.jlink 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         *
017:         */
018:        /**
019:         * jlink.java links together multiple .jar files Original code by Patrick
020:         * Beard. Modifications to work with ANT by Matthew Kuperus Heun.
021:         *
022:         */package org.apache.tools.ant.taskdefs.optional.jlink;
023:
024:        import java.io.BufferedInputStream;
025:        import java.io.File;
026:        import java.io.FileInputStream;
027:        import java.io.FileOutputStream;
028:        import java.io.IOException;
029:        import java.io.InputStream;
030:        import java.util.Enumeration;
031:        import java.util.Vector;
032:        import java.util.zip.CRC32;
033:        import java.util.zip.Deflater;
034:        import java.util.zip.ZipEntry;
035:        import java.util.zip.ZipException;
036:        import java.util.zip.ZipFile;
037:        import java.util.zip.ZipOutputStream;
038:
039:        // CheckStyle:TypeNameCheck OFF - bc
040:        /**
041:         * jlink links together multiple .jar files.
042:         */
043:        public class jlink {
044:
045:            private String outfile = null;
046:
047:            private Vector mergefiles = new Vector(10);
048:
049:            private Vector addfiles = new Vector(10);
050:
051:            private boolean compression = false;
052:
053:            // CheckStyle:VisibilityModifier OFF - bc
054:
055:            byte[] buffer = new byte[8192];
056:
057:            // CheckStyle:VisibilityModifier OFF - bc
058:
059:            /** The file that will be created by this instance of jlink.
060:             * @param outfile the file to create.
061:             */
062:            public void setOutfile(String outfile) {
063:                if (outfile == null) {
064:                    return;
065:                }
066:                this .outfile = outfile;
067:            }
068:
069:            /**
070:             * Adds a file to be merged into the output.
071:             * @param fileToMerge the file to merge into the output.
072:             */
073:            public void addMergeFile(String fileToMerge) {
074:                if (fileToMerge == null) {
075:                    return;
076:                }
077:                mergefiles.addElement(fileToMerge);
078:            }
079:
080:            /** Adds a file to be added into the output.
081:             * @param fileToAdd the file to add to the output.
082:             */
083:            public void addAddFile(String fileToAdd) {
084:                if (fileToAdd == null) {
085:                    return;
086:                }
087:                addfiles.addElement(fileToAdd);
088:            }
089:
090:            /**
091:             * Adds several files to be merged into the output.
092:             * @param filesToMerge an array of files to merge into the output.
093:             */
094:            public void addMergeFiles(String[] filesToMerge) {
095:                if (filesToMerge == null) {
096:                    return;
097:                }
098:                for (int i = 0; i < filesToMerge.length; i++) {
099:                    addMergeFile(filesToMerge[i]);
100:                }
101:            }
102:
103:            /**
104:             * Adds several file to be added into the output.
105:             * @param filesToAdd an array of files to add to the output.
106:             */
107:            public void addAddFiles(String[] filesToAdd) {
108:                if (filesToAdd == null) {
109:                    return;
110:                }
111:                for (int i = 0; i < filesToAdd.length; i++) {
112:                    addAddFile(filesToAdd[i]);
113:                }
114:            }
115:
116:            /**
117:             * Determines whether output will be compressed.
118:             * @param compress if true use compression.
119:             */
120:            public void setCompression(boolean compress) {
121:                this .compression = compress;
122:            }
123:
124:            /**
125:             * Performs the linking of files. Addfiles are added to the output as-is.
126:             * For example, a jar file is added to the output as a jar file. However,
127:             * mergefiles are first examined for their type. If it is a jar or zip
128:             * file, the contents will be extracted from the mergefile and entered
129:             * into the output. If a zip or jar file is encountered in a subdirectory
130:             * it will be added, not merged. If a directory is encountered, it becomes
131:             * the root entry of all the files below it. Thus, you can provide
132:             * multiple, disjoint directories, as addfiles: they will all be added in
133:             * a rational manner to outfile.
134:             * @throws Exception on error.
135:             */
136:            public void link() throws Exception {
137:                ZipOutputStream output = new ZipOutputStream(
138:                        new FileOutputStream(outfile));
139:
140:                if (compression) {
141:                    output.setMethod(ZipOutputStream.DEFLATED);
142:                    output.setLevel(Deflater.DEFAULT_COMPRESSION);
143:                } else {
144:                    output.setMethod(ZipOutputStream.STORED);
145:                }
146:
147:                Enumeration merges = mergefiles.elements();
148:
149:                while (merges.hasMoreElements()) {
150:                    String path = (String) merges.nextElement();
151:                    File f = new File(path);
152:
153:                    if (f.getName().endsWith(".jar")
154:                            || f.getName().endsWith(".zip")) {
155:                        //Do the merge
156:                        mergeZipJarContents(output, f);
157:                    } else {
158:                        //Add this file to the addfiles Vector and add it
159:                        //later at the top level of the output file.
160:                        addAddFile(path);
161:                    }
162:                }
163:
164:                Enumeration adds = addfiles.elements();
165:
166:                while (adds.hasMoreElements()) {
167:                    String name = (String) adds.nextElement();
168:                    File f = new File(name);
169:
170:                    if (f.isDirectory()) {
171:                        //System.out.println("in jlink: adding directory contents of " + f.getPath());
172:                        addDirContents(output, f, f.getName() + '/',
173:                                compression);
174:                    } else {
175:                        addFile(output, f, "", compression);
176:                    }
177:                }
178:                if (output != null) {
179:                    try {
180:                        output.close();
181:                    } catch (IOException ioe) {
182:                        //do nothing
183:                    }
184:                }
185:            }
186:
187:            /**
188:             * The command line entry point for jlink.
189:             * @param args an array of arguments
190:             */
191:            public static void main(String[] args) {
192:                // jlink output input1 ... inputN
193:                if (args.length < 2) {
194:                    System.out.println("usage: jlink output input1 ... inputN");
195:                    System.exit(1);
196:                }
197:                jlink linker = new jlink();
198:
199:                linker.setOutfile(args[0]);
200:                // To maintain compatibility with the command-line version,
201:                // we will only add files to be merged.
202:                for (int i = 1; i < args.length; i++) {
203:                    linker.addMergeFile(args[i]);
204:                }
205:                try {
206:                    linker.link();
207:                } catch (Exception ex) {
208:                    System.err.print(ex.getMessage());
209:                }
210:            }
211:
212:            /*
213:             * Actually performs the merging of f into the output.
214:             * f should be a zip or jar file.
215:             */
216:            private void mergeZipJarContents(ZipOutputStream output, File f)
217:                    throws IOException {
218:                //Check to see that the file with name "name" exists.
219:                if (!f.exists()) {
220:                    return;
221:                }
222:                ZipFile zipf = new ZipFile(f);
223:                Enumeration entries = zipf.entries();
224:
225:                while (entries.hasMoreElements()) {
226:                    ZipEntry inputEntry = (ZipEntry) entries.nextElement();
227:                    //Ignore manifest entries.  They're bound to cause conflicts between
228:                    //files that are being merged.  User should supply their own
229:                    //manifest file when doing the merge.
230:                    String inputEntryName = inputEntry.getName();
231:                    int index = inputEntryName.indexOf("META-INF");
232:
233:                    if (index < 0) {
234:                        //META-INF not found in the name of the entry. Go ahead and process it.
235:                        try {
236:                            output.putNextEntry(processEntry(zipf, inputEntry));
237:                        } catch (ZipException ex) {
238:                            //If we get here, it could be because we are trying to put a
239:                            //directory entry that already exists.
240:                            //For example, we're trying to write "com", but a previous
241:                            //entry from another mergefile was called "com".
242:                            //In that case, just ignore the error and go on to the
243:                            //next entry.
244:                            String mess = ex.getMessage();
245:
246:                            if (mess.indexOf("duplicate") >= 0) {
247:                                //It was the duplicate entry.
248:                                continue;
249:                            } else {
250:                                // I hate to admit it, but we don't know what happened
251:                                // here.  Throw the Exception.
252:                                throw ex;
253:                            }
254:                        }
255:
256:                        InputStream in = zipf.getInputStream(inputEntry);
257:                        int len = buffer.length;
258:                        int count = -1;
259:
260:                        while ((count = in.read(buffer, 0, len)) > 0) {
261:                            output.write(buffer, 0, count);
262:                        }
263:                        in.close();
264:                        output.closeEntry();
265:                    }
266:                }
267:                zipf.close();
268:            }
269:
270:            /*
271:             * Adds contents of a directory to the output.
272:             */
273:            private void addDirContents(ZipOutputStream output, File dir,
274:                    String prefix, boolean compress) throws IOException {
275:                String[] contents = dir.list();
276:
277:                for (int i = 0; i < contents.length; ++i) {
278:                    String name = contents[i];
279:                    File file = new File(dir, name);
280:
281:                    if (file.isDirectory()) {
282:                        addDirContents(output, file, prefix + name + '/',
283:                                compress);
284:                    } else {
285:                        addFile(output, file, prefix, compress);
286:                    }
287:                }
288:            }
289:
290:            /*
291:             * Gets the name of an entry in the file.  This is the real name
292:             * which for a class is the name of the package with the class
293:             * name appended.
294:             */
295:            private String getEntryName(File file, String prefix) {
296:                String name = file.getName();
297:
298:                if (!name.endsWith(".class")) {
299:                    // see if the file is in fact a .class file, and determine its actual name.
300:                    InputStream input = null;
301:                    try {
302:                        input = new FileInputStream(file);
303:                        String className = ClassNameReader.getClassName(input);
304:
305:                        if (className != null) {
306:                            return className.replace('.', '/') + ".class";
307:                        }
308:                    } catch (IOException ioe) {
309:                        //do nothing
310:                    } finally {
311:                        if (input != null) {
312:                            try {
313:                                input.close();
314:                            } catch (IOException e) {
315:                                //do nothing
316:                            }
317:                        }
318:                    }
319:                }
320:                System.out.println("From " + file.getPath() + " and prefix "
321:                        + prefix + ", creating entry " + prefix + name);
322:                return (prefix + name);
323:            }
324:
325:            /*
326:             * Adds a file to the output stream.
327:             */
328:            private void addFile(ZipOutputStream output, File file,
329:                    String prefix, boolean compress) throws IOException {
330:                //Make sure file exists
331:                if (!file.exists()) {
332:                    return;
333:                }
334:                ZipEntry entry = new ZipEntry(getEntryName(file, prefix));
335:
336:                entry.setTime(file.lastModified());
337:                entry.setSize(file.length());
338:                if (!compress) {
339:                    entry.setCrc(calcChecksum(file));
340:                }
341:                FileInputStream input = new FileInputStream(file);
342:
343:                addToOutputStream(output, input, entry);
344:            }
345:
346:            /*
347:             * A convenience method that several other methods might call.
348:             */
349:            private void addToOutputStream(ZipOutputStream output,
350:                    InputStream input, ZipEntry ze) throws IOException {
351:                try {
352:                    output.putNextEntry(ze);
353:                } catch (ZipException zipEx) {
354:                    //This entry already exists. So, go with the first one.
355:                    input.close();
356:                    return;
357:                }
358:
359:                int numBytes = -1;
360:
361:                while ((numBytes = input.read(buffer)) > 0) {
362:                    output.write(buffer, 0, numBytes);
363:                }
364:                output.closeEntry();
365:                input.close();
366:            }
367:
368:            /*
369:             * A method that does the work on a given entry in a mergefile.
370:             * The big deal is to set the right parameters in the ZipEntry
371:             * on the output stream.
372:             */
373:            private ZipEntry processEntry(ZipFile zip, ZipEntry inputEntry) {
374:                /*
375:                  First, some notes.
376:                  On MRJ 2.2.2, getting the size, compressed size, and CRC32 from the
377:                  ZipInputStream does not work for compressed (deflated) files.  Those calls return -1.
378:                  For uncompressed (stored) files, those calls do work.
379:                  However, using ZipFile.getEntries() works for both compressed and
380:                  uncompressed files.
381:
382:                  Now, from some simple testing I did, it seems that the value of CRC-32 is
383:                  independent of the compression setting. So, it should be easy to pass this
384:                  information on to the output entry.
385:                 */
386:                String name = inputEntry.getName();
387:
388:                if (!(inputEntry.isDirectory() || name.endsWith(".class"))) {
389:                    try {
390:                        InputStream input = zip.getInputStream(zip
391:                                .getEntry(name));
392:                        String className = ClassNameReader.getClassName(input);
393:
394:                        input.close();
395:                        if (className != null) {
396:                            name = className.replace('.', '/') + ".class";
397:                        }
398:                    } catch (IOException ioe) {
399:                        //do nothing
400:                    }
401:                }
402:                ZipEntry outputEntry = new ZipEntry(name);
403:
404:                outputEntry.setTime(inputEntry.getTime());
405:                outputEntry.setExtra(inputEntry.getExtra());
406:                outputEntry.setComment(inputEntry.getComment());
407:                outputEntry.setTime(inputEntry.getTime());
408:                if (compression) {
409:                    outputEntry.setMethod(ZipEntry.DEFLATED);
410:                    //Note, don't need to specify size or crc for compressed files.
411:                } else {
412:                    outputEntry.setMethod(ZipEntry.STORED);
413:                    outputEntry.setCrc(inputEntry.getCrc());
414:                    outputEntry.setSize(inputEntry.getSize());
415:                }
416:                return outputEntry;
417:            }
418:
419:            /*
420:             * Necessary in the case where you add a entry that
421:             * is not compressed.
422:             */
423:            private long calcChecksum(File f) throws IOException {
424:                BufferedInputStream in = new BufferedInputStream(
425:                        new FileInputStream(f));
426:
427:                return calcChecksum(in);
428:            }
429:
430:            /*
431:             * Necessary in the case where you add a entry that
432:             * is not compressed.
433:             */
434:            private long calcChecksum(InputStream in) throws IOException {
435:                CRC32 crc = new CRC32();
436:                int len = buffer.length;
437:                int count = -1;
438:                int haveRead = 0;
439:
440:                while ((count = in.read(buffer, 0, len)) > 0) {
441:                    haveRead += count;
442:                    crc.update(buffer, 0, count);
443:                }
444:                in.close();
445:                return crc.getValue();
446:            }
447:
448:        }
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