public static File copyResources(
ClassLoader classLoader,
String rootPath,
File toDir,
Function<String, String> relocationFunction) {
Collection<String> relativePaths = listFiles(classLoader, rootPath);
for (String relativePath : relativePaths) {
URL resource = classLoader.getResource(relativePath);
String filename = relocationFunction.apply(relativePath);
File toFile = new File(toDir, filename);
try {
FileUtils.copyURLToFile(resource, toFile);
} catch (IOException e) {
throw new IllegalStateException(
"Fail to extract " + relativePath + " to " + toFile.getAbsolutePath());
}
}
return toDir;
}
/**
* Finds directories and files within a given directory and its subdirectories.
*
* @param classLoader
* @param rootPath the root directory, for example org/sonar/sqale, or a file in this root
* directory, for example org/sonar/sqale/index.txt
* @param
* @return a list of relative paths, for example {"org/sonar/sqale", "org/sonar/sqale/foo",
* "org/sonar/sqale/foo/bar.txt}. Never null.
*/
public static Collection<String> listResources(
ClassLoader classLoader, String rootPath, Predicate<String> predicate) {
String jarPath = null;
JarFile jar = null;
try {
Collection<String> paths = Lists.newArrayList();
rootPath = StringUtils.removeStart(rootPath, "/");
URL root = classLoader.getResource(rootPath);
if (root != null) {
checkJarFile(root);
// Path of the root directory
// Examples :
// org/sonar/sqale/index.txt -> rootDirectory is org/sonar/sqale
// org/sonar/sqale/ -> rootDirectory is org/sonar/sqale
// org/sonar/sqale -> rootDirectory is org/sonar/sqale
String rootDirectory = rootPath;
if (StringUtils.substringAfterLast(rootPath, "/").indexOf('.') >= 0) {
rootDirectory = StringUtils.substringBeforeLast(rootPath, "/");
}
jarPath =
root.getPath().substring(5, root.getPath().indexOf("!")); // strip out only the JAR file
jar = new JarFile(URLDecoder.decode(jarPath, CharEncoding.UTF_8));
Enumeration<JarEntry> entries = jar.entries();
while (entries.hasMoreElements()) {
String name = entries.nextElement().getName();
if (name.startsWith(rootDirectory) && predicate.apply(name)) {
paths.add(name);
}
}
}
return paths;
} catch (Exception e) {
throw Throwables.propagate(e);
} finally {
closeJar(jar, jarPath);
}
}