/**
* Extract files from the <i>source</i> jar file to the <i>target</i> directory. If necessary, the
* <i>target</i> directory is created.<br>
* <br>
* For example, if this method is called with a <i>source</i> of <tt>foo.jar</tt> (which contains
* <tt>a</tt> and <tt>b</tt>) and a <i>target</i> of <tt>/bar</tt>, when this method exits
* <tt>/bar</tt> will contain <tt>/bar/a</tt> and <tt>/bar/b</tt>.
*
* @param progress if non-null, this progress monitor is updated with the name of each file as it
* is copied.
* @param source source jar file
* @param target directory
* @param saveSuffix if non-null, pre-existing files in <i>target</i> whose paths match files to
* be copied from <i>source</i> will be renamed to <tt>name + saveSuffix</tt>.
* @return false if any problems were encountered.
*/
public static final boolean copyJar(
ProgressMonitor progress, File source, File target, String saveSuffix) {
// if target exists, it must be a directory
if (target.exists() && !target.isDirectory()) {
return false;
}
// if the target doesn't exist yet, create it
if (!target.exists()) {
target.mkdirs();
}
// try to open the jar file
JarFile jar;
try {
jar = new JarFile(source);
} catch (IOException ioe) {
return false;
}
boolean result = true;
Enumeration en = jar.entries();
while (en.hasMoreElements()) {
JarEntry entry = (JarEntry) en.nextElement();
final String entryName = entry.getName();
// skip manifest files
if (JarFile.MANIFEST_NAME.startsWith(entryName)) {
continue;
}
File newFile = new File(target, entryName);
newFile.mkdirs();
if (!entry.isDirectory()) {
InputStream in;
try {
in = jar.getInputStream(entry);
} catch (IOException ioe) {
System.err.println("Couldn't copy entry " + entryName);
continue;
}
copyStreamToFile(progress, in, newFile, saveSuffix);
try {
in.close();
} catch (Exception e) {;
}
}
newFile.setLastModified(entry.getTime());
}
return result;
}
