Is there any API for creating a package structure from Java source files

Question

I have a source folder with Java source files. These Java files have different packages. Using the javac command, I can generate the package structure, but the packages will contain class files, not the source files.

Is there any API that generates a package structure from Java files and puts Java files in a specific package

Answer 1

Here is what I found for this problem. It opens a java file, reads the package name, generates a structure, and copies the file to this structure. Suggestions for improvement are welcome. :)

public final class FileListing { private Map packageMap; public void createPackageStructure(String sourceDir) throws FileNotFoundException { FileListing fileListing = new FileListing(); File startingDirectory= new File(sourceDir); fileListing.packageMap = new HashMap(); List<File> files = fileListing.getFileListing(startingDirectory, fileListing.getPackageMap()); fileListing.moveFiles(fileListing.packageMap); } public List<File> getFileListing(File aStartingDir, Map packageMap) throws FileNotFoundException { validateDirectory(aStartingDir); List<File> result = getFileListingNoSort(aStartingDir,packageMap); Collections.sort(result); return result; } private List<File> getFileListingNoSort(File aStartingDir, Map packageMap) throws FileNotFoundException { List<File> result = new ArrayList<File>(); File[] filesAndDirs = aStartingDir.listFiles(); List<File> filesDirs = Arrays.asList(filesAndDirs); for(File file : filesDirs) { result.add(file); if(file.isFile()) { packageMap.put(file, readPackageName(file.getAbsolutePath()).replace(".", "/").replace(";", "/")); } else { //must be a directory //recursive call! List<File> deeperList = getFileListingNoSort(file,packageMap); result.addAll(deeperList); } } return result; } public String readPackageName(String filePath) { String packageName=null; String line; String temp[] = new String[2]; BufferedReader br=null; try{ File javaFile = new File(filePath); br = new BufferedReader(new FileReader(javaFile)); while((line=br.readLine())!=null) { if(line.indexOf("package")!=-1) { temp = line.split(" "); break; } } br.close(); }catch(FileNotFoundException fnfe) { fnfe.printStackTrace(); }catch(IOException ioe) { ioe.printStackTrace(); } return temp[1]; } public void moveFiles(Map packageMap) { Set keySet = packageMap.keySet(); Iterator it = keySet.iterator(); File sourceFile, destFile, destDirs; InputStream in = null; OutputStream out = null; byte[] buf = new byte[1024]; int len; try{ while(it.hasNext()) { sourceFile = (File)it.next(); destDirs = new File("src/"+(String)packageMap.get(sourceFile)); destFile = new File("src/"+ (String)packageMap.get(sourceFile)+"/"+sourceFile.getName()); destDirs.mkdirs(); in = new FileInputStream(sourceFile); out = new FileOutputStream(destFile); while((len = in.read(buf)) > 0){ out.write(buf, 0, len); } } }catch(FileNotFoundException fnfe) { fnfe.printStackTrace(); }catch(IOException ioe) { ioe.printStackTrace(); } } static private void validateDirectory (File aDirectory) throws FileNotFoundException { if (aDirectory == null) { throw new IllegalArgumentException("Directory should not be null."); } if (!aDirectory.exists()) { throw new FileNotFoundException("Directory does not exist: " + aDirectory); } if (!aDirectory.isDirectory()) { throw new IllegalArgumentException("Is not a directory: " + aDirectory); } if (!aDirectory.canRead()) { throw new IllegalArgumentException("Directory cannot be read: " + aDirectory); } } public Map getPackageMap() { return this.packageMap; } } 

Answer 2

Assuming you are running on Windows, I wrote a script package for this.

Copy the contents below into source.bat , put source.bat in the same directory where you will find all your .java files and just run it.

 @echo off @setlocal enabledelayedexpansion for /f "usebackq delims=" %%f in (`dir /s /b *.java`) do ( set file=%%~nxf for /f "usebackq delims=" %%p in (`findstr package %%~nxf`) do ( set package=%%p set package=!package:*.java:=! set package=!package:package =! set package=!package:;=! set package=!package:.=\! echo Expanding !package!... mkdir !package! xcopy /f %%~nxf !package! ) ) @endlocal 

If you are using Unix / Linux, here is the bash script. I am sure that this can be done much better and concisely, but it definitely works.

 #! /bin/bash for file in *.java do package=`grep -h 'package' $file` package=`echo $package | sed 's/package//g'` package=`echo $package | sed 's/;//g'` package=`echo $package | sed 's/\./\//g'` echo Expanding $package... mkdir -p $package cp $file $package done