| 1 | package be.nikiroo.jvcard.resources; |
| 2 | |
| 3 | // code copied from from: |
| 4 | // http://forums.devx.com/showthread.php?t=153784, |
| 5 | // via: |
| 6 | // http://stackoverflow.com/questions/3923129/get-a-list-of-resources-from-classpath-directory |
| 7 | |
| 8 | import java.io.File; |
| 9 | import java.io.IOException; |
| 10 | import java.util.ArrayList; |
| 11 | import java.util.Collection; |
| 12 | import java.util.Enumeration; |
| 13 | import java.util.regex.Pattern; |
| 14 | import java.util.zip.ZipEntry; |
| 15 | import java.util.zip.ZipException; |
| 16 | import java.util.zip.ZipFile; |
| 17 | |
| 18 | /** |
| 19 | * list resources available from the classpath @ * |
| 20 | */ |
| 21 | public class ResourceList { |
| 22 | |
| 23 | /** |
| 24 | * for all elements of java.class.path get a Collection of resources Pattern |
| 25 | * pattern = Pattern.compile(".*"); gets all resources |
| 26 | * |
| 27 | * @param pattern |
| 28 | * the pattern to match |
| 29 | * @return the resources in the order they are found |
| 30 | */ |
| 31 | public static Collection<String> getResources(final Pattern pattern) { |
| 32 | final ArrayList<String> retval = new ArrayList<String>(); |
| 33 | final String classPath = System.getProperty("java.class.path", "."); |
| 34 | final String[] classPathElements = classPath.split(System |
| 35 | .getProperty("path.separator")); |
| 36 | for (final String element : classPathElements) { |
| 37 | retval.addAll(getResources(element, pattern)); |
| 38 | } |
| 39 | return retval; |
| 40 | } |
| 41 | |
| 42 | private static Collection<String> getResources(final String element, |
| 43 | final Pattern pattern) { |
| 44 | final ArrayList<String> retval = new ArrayList<String>(); |
| 45 | final File file = new File(element); |
| 46 | if (file.isDirectory()) { |
| 47 | retval.addAll(getResourcesFromDirectory(file, pattern)); |
| 48 | } else { |
| 49 | retval.addAll(getResourcesFromJarFile(file, pattern)); |
| 50 | } |
| 51 | return retval; |
| 52 | } |
| 53 | |
| 54 | private static Collection<String> getResourcesFromJarFile(final File file, |
| 55 | final Pattern pattern) { |
| 56 | final ArrayList<String> retval = new ArrayList<String>(); |
| 57 | ZipFile zf; |
| 58 | try { |
| 59 | zf = new ZipFile(file); |
| 60 | } catch (final ZipException e) { |
| 61 | throw new Error(e); |
| 62 | } catch (final IOException e) { |
| 63 | throw new Error(e); |
| 64 | } |
| 65 | final Enumeration<? extends ZipEntry> e = zf.entries(); |
| 66 | while (e.hasMoreElements()) { |
| 67 | final ZipEntry ze = (ZipEntry) e.nextElement(); |
| 68 | final String fileName = ze.getName(); |
| 69 | final boolean accept = pattern.matcher(fileName).matches(); |
| 70 | if (accept) { |
| 71 | retval.add(fileName); |
| 72 | } |
| 73 | } |
| 74 | try { |
| 75 | zf.close(); |
| 76 | } catch (final IOException e1) { |
| 77 | throw new Error(e1); |
| 78 | } |
| 79 | return retval; |
| 80 | } |
| 81 | |
| 82 | private static Collection<String> getResourcesFromDirectory( |
| 83 | final File directory, final Pattern pattern) { |
| 84 | final ArrayList<String> retval = new ArrayList<String>(); |
| 85 | final File[] fileList = directory.listFiles(); |
| 86 | for (final File file : fileList) { |
| 87 | if (file.isDirectory()) { |
| 88 | retval.addAll(getResourcesFromDirectory(file, pattern)); |
| 89 | } else { |
| 90 | try { |
| 91 | final String fileName = file.getCanonicalPath(); |
| 92 | final boolean accept = pattern.matcher(fileName).matches(); |
| 93 | if (accept) { |
| 94 | retval.add(fileName); |
| 95 | } |
| 96 | } catch (final IOException e) { |
| 97 | throw new Error(e); |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | return retval; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * list the resources that match args[0] |
| 106 | * |
| 107 | * @param args |
| 108 | * args[0] is the pattern to match, or list all resources if |
| 109 | * there are no args |
| 110 | */ |
| 111 | public static void main(final String[] args) { |
| 112 | Pattern pattern; |
| 113 | if (args.length < 1) { |
| 114 | pattern = Pattern.compile(".*"); |
| 115 | } else { |
| 116 | pattern = Pattern.compile(args[0]); |
| 117 | } |
| 118 | final Collection<String> list = ResourceList.getResources(pattern); |
| 119 | for (final String name : list) { |
| 120 | System.out.println(name); |
| 121 | } |
| 122 | } |
| 123 | } |