/**
* Execute Script Loads environment and saves result
*
* @return null or Exception
*/
public Exception execute() {
m_result = null;
if (m_variable == null
|| m_variable.length() == 0
|| m_script == null
|| m_script.length() == 0) {
IllegalArgumentException e = new IllegalArgumentException("No variable/script");
log.config(e.toString());
return e;
}
Interpreter i = new Interpreter();
loadEnvironment(i);
try {
log.config(m_script);
i.eval(m_script);
} catch (Exception e) {
log.config(e.toString());
return e;
}
try {
m_result = i.get(m_variable);
log.config("Result (" + m_result.getClass().getName() + ") " + m_result);
} catch (Exception e) {
log.config("Result - " + e);
if (e instanceof NullPointerException)
e = new IllegalArgumentException("Result Variable not found - " + m_variable);
return e;
}
return null;
} // execute
private static void endInterpreter(String contextId) throws EvalError {
Interpreter i = interpreters.get(contextId);
if (i == null) return;
i.eval("clear();"); // can't hurt to tell bsh to clean up internally
interpreters.remove(contextId); // now wait for GC
Log.log("Destroyed context: " + contextId + " (" + i + ")");
}
/**
* Runs a BeanShell script. Errors are passed to the caller.
*
* <p>If the <code>in</code> parameter is non-null, the script is read from that stream; otherwise
* it is read from the file identified by <code>path</code> .
*
* <p>The <code>scriptPath</code> BeanShell variable is set to the path name of the script.
*
* @param path The script file's VFS path.
* @param in The reader to read the script from, or <code>null</code> .
* @param namespace The namespace to run the script in.
* @exception Exception instances are thrown when various BeanShell errors occur
* @since jEdit 4.2pre5
*/
public void _runScript(String path, Reader in, NameSpace namespace) throws Exception {
log.info("Running script " + path);
Interpreter interp = createInterpreter(namespace);
try {
if (in == null) {
in = res.getResourceAsReader(path);
}
setupDefaultVariables(namespace);
interp.set("scriptPath", path);
running = true;
interp.eval(in, namespace, path);
} catch (Exception e) {
unwrapException(e);
} finally {
running = false;
try {
// no need to do this for macros!
if (namespace == global) {
resetDefaultVariables(namespace);
interp.unset("scriptPath");
}
} catch (EvalError e) {
// do nothing
}
}
} // }}}
public String[][] exec(String[] befehle) {
String[][] antworten = new String[befehle.length][1];
Object aktObj;
for (int i = 0; i < befehle.length; i++) {
try {
aktObj = interpreter.eval(befehle[i]);
if (aktObj != null) antworten[i][0] = aktObj.toString();
else antworten[i][0] = "null";
} catch (EvalError e) {
System.err.println(e.getMessage());
antworten[i][0] = "ERROR";
}
if (verbose) {
assert !quiet;
System.out.println("# " + i + ": " + befehle[i]);
for (int j = 0; j < antworten[i].length; j++) {
System.out.println("@ " + antworten[i][j]);
}
} else if (!quiet)
for (int j = 0; j < antworten[i].length; j++) {
System.out.print("#");
}
}
return antworten;
}
public String[] exec(String befehl) {
String[] antwort = new String[1];
Object aktObj;
try {
aktObj = interpreter.eval(befehl);
if (aktObj != null) antwort[0] = aktObj.toString();
else antwort[0] = "null";
} catch (EvalError e) {
System.err.println(e.getMessage());
antwort[0] = "ERROR";
}
if (!quiet) System.out.print("#");
if (verbose) {
assert !quiet;
System.out.println(" " + befehl);
System.out.println("@ " + antwort[0]);
}
return antwort;
}
/**
* Evaluates the specified BeanShell expression. Unlike <code>eval()</code> , this method passes
* any exceptions to the caller.
*
* @param namespace The namespace
* @param command The expression
* @return Description of the Return Value
* @exception Exception instances are thrown when various BeanShell errors occur
* @since jEdit 3.2pre7
*/
public Object _eval(NameSpace namespace, String command) throws Exception {
Interpreter interp = createInterpreter(namespace);
try {
setupDefaultVariables(namespace);
if (log.isDebugEnabled()) {
log.debug("Running script: " + command);
}
return interp.eval(command);
} catch (Exception e) {
unwrapException(e);
// never called
return null;
} finally {
// try {
resetDefaultVariables(namespace);
// }
// catch (UtilEvalError e) {
// do nothing
// }
}
} // }}}
private static Interpreter getInterpreter(String contextId) throws EvalError {
// Get the appropriate interpreter
Interpreter i = null;
boolean createdInterp = false;
synchronized (interpreters) { // serialize two gets of the same name
i = interpreters.get(contextId);
if (i == null) {
i = new Interpreter();
interpreters.put(contextId, i);
createdInterp = true;
}
}
if (createdInterp) {
Log.log("Created context: " + contextId + " (" + i + ")");
// Now configure stdin and stdout to capture 10k of content
// Store references to the circular buffers within the interpreter itself.
// This provides a nice place to store them plus theoretically allows
// advanced use from within the bsh environment.
// On Windows print() outputs \r\n but in XQuery that's normalized to \n
// so the 10k of Java buffer may produce less than 10k of content in XQuery!
OutputStream circularOutput = new CircularByteArrayOutputStream(10240);
PrintStream printOutput = new PrintStream(circularOutput);
i.setOut(printOutput);
i.set("mljamout", circularOutput);
OutputStream circularError = new CircularByteArrayOutputStream(10240);
PrintStream printError = new PrintStream(circularError);
i.setErr(printError);
i.set("mljamerr", circularError);
// Capture the built-in System.out and System.err also.
// (Commented out since System appears global, can't do per interpreter.)
// i.set("mljamprintout", printOutput);
// i.set("mljamprinterr", printError);
// i.eval("System.setOut(mljamprintout);");
// i.eval("System.setErr(mljamprinterr);");
// Need to expose hexdecode() and base64decode() built-in functions
i.eval("hexdecode(String s) { return com.xqdev.jam.MLJAM.hexDecode(s); }");
i.eval("base64decode(String s) { return com.xqdev.jam.MLJAM.base64Decode(s); }");
// Let's tell the context what its id is
i.set("mljamid", contextId);
}
// Update the last accessed time, used for cleaning
i.set("mljamlast", System.currentTimeMillis());
// If it's been long enough, go snooping for stale contexts
if (System.currentTimeMillis() > lastClean + CLEAN_INTERVAL) {
Log.log("Initiated periodic scan for stale context objects");
lastClean = System.currentTimeMillis();
Iterator<Interpreter> itr = interpreters.values().iterator();
while (itr.hasNext()) {
Interpreter interp = itr.next();
Long last = (Long) interp.get("mljamlast");
if (System.currentTimeMillis() > last + STALE_TIMEOUT) {
itr.remove();
Log.log("Staled context: " + interp.get("mljamid") + " (" + interp + ")");
} else if ((System.currentTimeMillis() > last + TEMP_STALE_TIMEOUT)
&& ("" + interp.get("mljamid")).startsWith("temp:")) {
itr.remove();
Log.log("Staled temp context: " + interp.get("mljamid") + " (" + interp + ")");
}
}
}
return i;
}
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
try {
// A good request looks like /mljam/contextid/verb?name=varname
// The extra path info includes the context id and verb
String extra = req.getPathInfo(); // "/contextid/verb"
if (extra == null || extra.equals("")) {
throw new ClientProblemException(
"Request requires a context id and verb in its extra path info");
}
String[] parts = extra.split("/"); // { "", "contextid", "verb" }
if (parts.length < 2) {
throw new ClientProblemException(
"Request requires a context id and verb in its extra path info");
} else if (parts.length < 3) {
throw new ClientProblemException("Request requires a verb in its extra path info");
}
String contextId = parts[1];
String verb = parts[2];
String method = req.getMethod();
if (method.equalsIgnoreCase("get")) {
// We have three GET verbs: get, get-stdout, get-stderr.
// These are all idempotent, while the POST verbs aren't. The get
// verb accept a "name" query string parameter. The get verb returns
// either XQuery to evaluate (indicated by x-marklogic/xquery content type)
// or a raw binary (indicated by an application/binary-encoded content type).
if (verb.equalsIgnoreCase("get")) {
String name = req.getParameter("name");
if (name == null || name.equals("")) {
throw new ClientProblemException("The get verb requires a name parameter");
}
Interpreter i = getInterpreter(contextId);
Object o = i.get(name);
if (o instanceof byte[]) {
sendBinaryResponse(res, (byte[]) o);
} else if (o instanceof String) {
sendStringResponse(res, (String) o);
} else {
sendXQueryResponse(res, o);
}
} else if (verb.equalsIgnoreCase("get-stdout")) {
Interpreter i = getInterpreter(contextId);
i.getOut().flush();
CircularByteArrayOutputStream circ = (CircularByteArrayOutputStream) i.get("mljamout");
if (circ != null) {
sendStringResponse(res, circ.toString());
circ.reset();
} else {
throw new ServerProblemException("Could not fetch mljamout from interpreter context");
}
} else if (verb.equalsIgnoreCase("get-stderr")) {
Interpreter i = getInterpreter(contextId);
i.getErr().flush();
CircularByteArrayOutputStream circ = (CircularByteArrayOutputStream) i.get("mljamerr");
if (circ != null) {
sendStringResponse(res, circ.toString());
circ.reset();
} else {
throw new ServerProblemException("Could not fetch mljamerr from interpreter context");
}
} else {
throw new ClientProblemException("Unrecognized GET verb: " + verb);
}
} else if (method.equalsIgnoreCase("post")) {
// We have six POST verbs: eval, unset, end, source, set-string, and set-binary.
// These are POST verbs because they aren't idempotent.
// The set-string, set-binary, unset, and source verbs accept a "name"
// query string parameter. The set-string and set-binary verbs accept
// a value in their post body. The eval verb accepts code in its post body.
if (verb.equalsIgnoreCase("set-string")) {
String name = req.getParameter("name");
if (name == null || name.equals("")) {
throw new ClientProblemException("The set-string verb requires a name parameter");
}
String body = getBody(req); // a value of "" is legit
Interpreter i = getInterpreter(contextId);
i.unset(name);
i.set(name, body);
sendNoResponse(res);
} else if (verb.equalsIgnoreCase("set-binary")) {
String name = req.getParameter("name");
if (name == null || name.equals("")) {
throw new ClientProblemException("The set-binary verb requires a name parameter");
}
String body = getBody(req); // a value of "" is legit
byte[] bodyBytes = hexDecode(body); // later could do this streaming for speed
Interpreter i = getInterpreter(contextId);
i.unset(name);
i.set(name, bodyBytes);
sendNoResponse(res);
} else if (verb.equalsIgnoreCase("eval")) {
String body = getBody(req);
if (body == null || body.equals("")) {
throw new ClientProblemException(
"The eval verb requires a post body containing code to eval");
}
Interpreter i = getInterpreter(contextId);
i.eval(body);
sendNoResponse(res);
} else if (verb.equalsIgnoreCase("eval-get")) {
String body = getBody(req);
if (body == null || body.equals("")) {
throw new ClientProblemException(
"The eval-get verb requires a post body containing code to eval");
}
Interpreter i = getInterpreter(contextId);
Object o = i.eval(body);
if (o instanceof byte[]) {
sendBinaryResponse(res, (byte[]) o);
} else if (o instanceof String) {
sendStringResponse(res, (String) o);
} else {
sendXQueryResponse(res, o);
}
} else if (verb.equalsIgnoreCase("unset")) {
String name = req.getParameter("name");
if (name == null || name.equals("")) {
throw new ClientProblemException("The unset verb requires a name parameter");
}
Interpreter i = getInterpreter(contextId);
i.unset(name);
sendNoResponse(res);
} else if (verb.equalsIgnoreCase("end")) {
endInterpreter(contextId);
sendNoResponse(res);
} else if (verb.equalsIgnoreCase("source")) {
String name = req.getParameter("name");
if (name == null || name.equals("")) {
throw new ClientProblemException("The source verb requires a name parameter");
}
Interpreter i = getInterpreter(contextId);
i.source(name);
sendNoResponse(res);
} else {
throw new ClientProblemException("Unrecognized POST verb: " + verb);
}
}
} catch (TargetError e) {
Throwable target = e.getTarget();
Log.log(e);
Log.log("Target: " + target);
sendServerProblemResponse(
res,
target.getClass().getName()
+ ": "
+ target.getMessage()
+ " when executing Java code: "
+ e.getErrorText()); // include full trace?
} catch (EvalError e) {
Log.log(e);
sendServerProblemResponse(
res, e.getClass().getName() + ": " + e.getMessage()); // include full trace?
} catch (ClientProblemException e) {
Log.log(e);
sendClientProblemResponse(res, e.getMessage());
} catch (ServerProblemException e) {
Log.log(e);
sendServerProblemResponse(res, e.getMessage());
}
}