/**
* Perform the 'hotswap' command.
*
* @param session JSwat session on which to operate.
* @param args Tokenized string of command arguments.
* @param out Output to write messages to.
*/
public void perform(Session session, CommandArguments args, Log out) {
if (!session.isActive()) {
throw new CommandException(Bundle.getString("noActiveSession"));
}
if (!args.hasMoreTokens()) {
throw new MissingArgumentsException();
}
// Name of class is required; name of .class file is optional.
String cname = args.nextToken();
String cfile = null;
if (args.hasMoreTokens()) {
cfile = args.nextToken();
}
// Find the ReferenceType for this class.
VirtualMachine vm = session.getConnection().getVM();
List classes = vm.classesByName(cname);
if (classes.size() == 0) {
throw new CommandException(Bundle.getString("hotswap.noSuchClass"));
}
ReferenceType clazz = (ReferenceType) classes.get(0);
// Did the user give us a .class file?
InputStream is = null;
if (cfile == null) {
// Try to find the .class file.
PathManager pathman = (PathManager) session.getManager(PathManager.class);
SourceSource src = pathman.mapClass(clazz);
if (src == null) {
throw new CommandException(Bundle.getString("hotswap.fileNotFound"));
}
is = src.getInputStream();
} else {
// A filename was given, just open it.
try {
is = new FileInputStream(cfile);
} catch (FileNotFoundException fnfe) {
throw new CommandException(Bundle.getString("hotswap.fileNotFound"));
}
}
// Do the actual hotswap operation.
try {
Classes.hotswap(clazz, is, vm);
out.writeln(Bundle.getString("hotswap.success"));
} catch (UnsupportedOperationException uoe) {
if (!vm.canRedefineClasses()) {
throw new CommandException(Bundle.getString("hotswap.noHotSwap"));
} else if (!vm.canAddMethod()) {
throw new CommandException(Bundle.getString("hotswap.noAddMethod"));
} else if (!vm.canUnrestrictedlyRedefineClasses()) {
throw new CommandException(Bundle.getString("hotswap.noUnrestricted"));
} else {
throw new CommandException(Bundle.getString("hotswap.unsupported"));
}
} catch (IOException ioe) {
throw new CommandException(Bundle.getString("hotswap.errorReadingFile") + ' ' + ioe);
} catch (NoClassDefFoundError ncdfe) {
throw new CommandException(Bundle.getString("hotswap.wrongClass"));
} catch (VerifyError ve) {
throw new CommandException(Bundle.getString("hotswap.verifyError") + ' ' + ve);
} catch (UnsupportedClassVersionError ucve) {
throw new CommandException(Bundle.getString("hotswap.versionError") + ' ' + ucve);
} catch (ClassFormatError cfe) {
throw new CommandException(Bundle.getString("hotswap.formatError") + ' ' + cfe);
} catch (ClassCircularityError cce) {
throw new CommandException(Bundle.getString("hotswap.circularity") + ' ' + cce);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException ioe) {
}
}
}
} // perform
