package org.eurekaj.app;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.jar.JarInputStream;
import java.util.jar.Manifest;
import java.util.zip.ZipEntry;
import org.apache.log4j.Logger;
public final class JarUtils {
private static Logger logger = Logger.getLogger(JarUtils.class.getName());
public static void unjar(String filePath, File dest) throws IOException {
logger.info("Unjar-ing " + filePath + " to destination: " + dest.getAbsolutePath());
BufferedInputStream in = new BufferedInputStream(new FileInputStream(filePath));
if (!dest.exists()) {
dest.mkdirs();
}
if (!dest.isDirectory()) {
throw new IOException("Destination must be a directory.");
}
JarInputStream jin = new JarInputStream(in);
byte[] buffer = new byte[1024];
ZipEntry entry = jin.getNextEntry();
while (entry != null) {
String fileName = entry.getName();
if (fileName.charAt(fileName.length() - 1) == '/') {
fileName = fileName.substring(0, fileName.length() - 1);
}
if (fileName.charAt(0) == '/') {
fileName = fileName.substring(1);
}
if (File.separatorChar != '/') {
fileName = fileName.replace('/', File.separatorChar);
}
File file = new File(dest, fileName);
if (entry.isDirectory()) {
// make sure the directory exists
file.mkdirs();
jin.closeEntry();
} else {
// make sure the directory exists
File parent = file.getParentFile();
if (parent != null && !parent.exists()) {
parent.mkdirs();
}
// dump the file
OutputStream out = new FileOutputStream(file);
int len = 0;
while ((len = jin.read(buffer, 0, buffer.length)) != -1) {
out.write(buffer, 0, len);
}
out.flush();
out.close();
jin.closeEntry();
file.setLastModified(entry.getTime());
}
entry = jin.getNextEntry();
}
/*
* Explicity write out the META-INF/MANIFEST.MF so that any headers such
* as the Class-Path are see for the unpackaged jar
*/
Manifest mf = jin.getManifest();
if (mf != null) {
File file = new File(dest, "META-INF/MANIFEST.MF");
File parent = file.getParentFile();
if (parent.exists() == false) {
parent.mkdirs();
}
OutputStream out = new FileOutputStream(file);
mf.write(out);
out.flush();
out.close();
}
jin.close();
}
}