/**
* Returns a file from which the specified resource can be loaded. This method will unpack the
* resource into a temporary directory and return a reference to that file.
*
* @param path the path to the resource in this jar file.
* @return a file from which the resource can be loaded or null if no such resource exists.
*/
public File getResourceFile(String path) throws IOException {
if (resolveJarFile()) {
return null;
}
// if we have been unpacked, return our unpacked file
if (_cache != null) {
File cfile = new File(_cache, path);
if (cfile.exists()) {
return cfile;
} else {
return null;
}
}
// otherwise, we unpack resources as needed into a temp directory
String tpath = StringUtil.md5hex(_source.getPath() + "%" + path);
File tfile = new File(getCacheDir(), tpath);
if (tfile.exists() && (tfile.lastModified() > _sourceLastMod)) {
return tfile;
}
JarEntry entry = _jarSource.getJarEntry(path);
if (entry == null) {
// log.info("Couldn't locate path in jar", "path", path, "jar", _jarSource);
return null;
}
// copy the resource into the temporary file
BufferedOutputStream fout = new BufferedOutputStream(new FileOutputStream(tfile));
InputStream jin = _jarSource.getInputStream(entry);
StreamUtil.copy(jin, fout);
jin.close();
fout.close();
return tfile;
}
