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source: trunk/EventBenchConsole/src/de/ugoe/cs/eventbench/windows/EventGenerator.java @ 106

Last change on this file since 106 was 77, checked in by sherbold, 14 years ago
+ introduced de.ugoe.cs.eventbench.windows.WindowsEvent?
File size: 25.2 KB

Line
1	package de.ugoe.cs.eventbench.windows;
2
3	import java.io.IOException;
4	import java.security.InvalidParameterException;
5	import java.util.HashMap;
6	import java.util.Iterator;
7	import java.util.LinkedList;
8	import java.util.List;
9	import java.util.ListIterator;
10	import java.util.Map;
11	import java.util.NoSuchElementException;
12
13	import org.jdom.Document;
14	import org.jdom.Element;
15	import org.jdom.JDOMException;
16	import org.jdom.Namespace;
17	import org.jdom.input.SAXBuilder;
18
19	import de.ugoe.cs.eventbench.windows.data.WindowTree;
20	import de.ugoe.cs.eventbench.windows.data.WindowTreeNode;
21	import de.ugoe.cs.eventbench.windows.data.WindowsMessage;
22	import de.ugoe.cs.util.console.Console;
23
24	/**
25	* <p>
26	* Translates sequences of windows messages into events that can be used by the
27	* Logalyzer core libraries for usage analysis.
28	* </p>
29	*
30	* @author Steffen Herbold
31	*
32	*/
33	public class EventGenerator {
34
35	/**
36	* <p>
37	* Helper method that fetches the document node of an XML file.
38	* </p>
39	*
40	* @param filename
41	* name of the XML file
42	* @return the document node
43	*/
44	private static Document getDocument(String filename) {
45	SAXBuilder builder = new SAXBuilder();
46	Document doc = null;
47
48	try {
49	doc = builder.build(filename);
50	rulesNamespace = Namespace.getNamespace("ul:rules");
51	} catch (JDOMException e) {
52	System.err.println("Invalid rules file.");
53	e.printStackTrace();
54	} catch (IOException e) {
55	System.err.println("Invalid rules file.");
56	e.printStackTrace();
57	}
58
59	return doc;
60	}
61
62	/**
63	* <p>
64	* Name and path of the XML files containing the rules.
65	* </p>
66	*/
67	private String rulesFile;
68
69	/**
70	* <p>
71	* Iterator used for the current sequence.
72	* </p>
73	*/
74	private ListIterator<WindowsMessage> sequenceIterator;
75
76	/**
77	* <p>
78	* Token that is currently being generated.
79	* </p>
80	*/
81	private WindowsEvent currentToken;
82
83	/**
84	* <p>
85	* Reference to the ul:rules namespace.
86	* </p>
87	*/
88	private static Namespace rulesNamespace;
89
90	/**
91	* <p>
92	* The name of the rule that is currently being evaluated.
93	* </p>
94	*/
95	private String currentRuleName;
96
97	/**
98	* <p>
99	* Internal message storage. Used to implement the
100	* <code>{@literal <store>}</code> and <code>{@literal <storeSeq>}</code>
101	* tags.
102	* </p>
103	*/
104	private Map<String, Object> messageStorage;
105
106	/**
107	* <p>
108	* Creates a new EventGenerator. Sets "rules/rules.xml" as default file for
109	* the rules.
110	* </p>
111	*/
112	public EventGenerator() {
113	rulesFile = "rules/rules.xml";
114	}
115
116	/**
117	* <p>
118	* Tries to match the rules to the given sequence to generate an
119	* {@link WindowsEvent}.
120	* </p>
121	* <p>
122	* The rules are matched the order, in which they are defined in the XML
123	* file. Therefore, the order of the rules in the file defines priorities,
124	* when multiple rules could be matched to the same sequence.
125	* </p>
126	*
127	* @param sequence
128	* sequence of message for which an event will be generated
129	* @return event that matches the messages; null, if no rule can be matched
130	*/
131	@SuppressWarnings("unchecked")
132	public WindowsEvent generateEvent(List<WindowsMessage> sequence) {
133	Document rulesDoc = getDocument(rulesFile);
134	Element rulesRoot = rulesDoc.getRootElement();
135
136	List<Element> ruleElements = rulesRoot.getChildren("rule",
137	rulesNamespace);
138
139	boolean isMatch = false;
140
141	for (int ruleIndex = 0; ruleIndex < ruleElements.size() && !isMatch; ruleIndex++) {
142	Element currentRule = ruleElements.get(ruleIndex);
143	currentRuleName = currentRule.getAttributeValue("name");
144	currentToken = new WindowsEvent(currentRuleName);
145	currentToken.setDecorator(MFCReplayDecorator.getInstance());
146	isMatch = true;
147	messageStorage = new HashMap<String, Object>();
148	sequenceIterator = sequence.listIterator();
149	List<Element> ruleChildrenMsg = currentRule.getChildren("msg",
150	rulesNamespace);
151
152	int i = 0;
153	while (isMatch && i < ruleChildrenMsg.size()) {
154	Element messageElement = ruleChildrenMsg.get(i);
155	if ("true".equals(messageElement.getAttributeValue("multiple"))) {
156	Element nextMessageElement = null;
157	if (i + 1 < ruleChildrenMsg.size()) {
158	nextMessageElement = ruleChildrenMsg.get(i + 1);
159	}
160	try {
161	isMatch = matchMultipleMessages(messageElement,
162	nextMessageElement);
163	} catch (InvalidParameterException e) {
164	Console.printerrln(e.getMessage());
165	}
166	} else {
167	try {
168	isMatch = matchSingleMessage(messageElement);
169	} catch (InvalidParameterException e) {
170	Console.printerrln(e.getMessage());
171	}
172	}
173	i++;
174	}
175	if (isMatch) {
176	List<Element> ruleChildren = currentRule.getChildren();
177	for (Element genMsgElement : ruleChildren) {
178	if (genMsgElement.getName().equals("genMsg")) {
179	try {
180	generateReplayMessage(genMsgElement);
181	} catch (InvalidParameterException e) {
182	Console.printerrln(e.getMessage());
183	currentToken.invalidateReplay();
184	}
185	} else if (genMsgElement.getName().equals("genMsgSeq")) {
186	try {
187	generateReplaySequence(genMsgElement);
188	currentToken.invalidateReplay();
189	} catch (InvalidParameterException e) {
190	Console.printerrln(e.getMessage());
191	currentToken.invalidateReplay();
192	}
193	}
194	}
195	Element idinfoElement = currentRule.getChild("idinfo",
196	rulesNamespace);
197	if (idinfoElement != null) {
198	// cannot be empty if document is valid
199	List<Element> valueElements = idinfoElement.getChildren();
200	currentToken.setIdInfo(getTermValue(null,
201	valueElements.get(0)));
202	}
203	Console.traceln(currentRule.getAttributeValue("name")
204	+ currentToken.getIdInfo() + " matched");
205	} else {
206	currentToken = null;
207	}
208	}
209	if (!isMatch) {
210	Console.traceln("no match found for sequence: "
211	+ sequence.toString());
212	}
213	return currentToken;
214	}
215
216	private boolean createSequenceLParam(
217	List<WindowsMessage> generatedMessageSeq, boolean msgsGenerated,
218	int constMsgType, Element termElement)
219	throws NoSuchElementException {
220	Iterator<WindowsMessage> seqIterator = generatedMessageSeq.iterator();
221	if (termElement.getName().equals("seqValue")) {
222	String obj = termElement.getAttributeValue("seqObj");
223	List<WindowsMessage> seqVar = getStoredSeqVariable(obj);
224	if (msgsGenerated && seqVar.size() != generatedMessageSeq.size()) {
225	throw new InvalidParameterException(
226	"Failure generating replay sequence for rule "
227	+ currentRuleName
228	+ ": One or more of the sequence variables used to generate a sequence have different lenghts.");
229	}
230	for (WindowsMessage msg : seqVar) {
231	WindowsMessage currentSeqMsg = getCurrentSeqMsg(
232	generatedMessageSeq, msgsGenerated, constMsgType,
233	seqIterator);
234	String paramValueStr = msg.getParameter(termElement
235	.getAttributeValue("param"));
236	int paramValue = 0;
237	try {
238	paramValue = Integer.parseInt(paramValueStr);
239	currentSeqMsg.setLPARAM(paramValue);
240	} catch (NumberFormatException e) {
241	currentSeqMsg.setLPARAMasWindowDesc(paramValueStr);
242	}
243	}
244	if (seqIterator.hasNext()) {
245	// the first seq-var has a different number of elements than the
246	// current one
247	throw new NoSuchElementException();
248	}
249	msgsGenerated = true;
250	} else { // const value
251	int paramValue = Integer.parseInt(getTermValue(null, termElement));
252	while (seqIterator.hasNext()) {
253	seqIterator.next().setLPARAM(paramValue);
254	}
255	}
256	return msgsGenerated;
257	}
258
259	private boolean createSequenceTarget(
260	List<WindowsMessage> generatedMessageSeq, boolean msgsGenerated,
261	int constMsgType, Element termElement)
262	throws NoSuchElementException {
263	Iterator<WindowsMessage> seqIterator = generatedMessageSeq.iterator();
264	if (termElement.getName().equals("seqValue")) {
265	String obj = termElement.getAttributeValue("seqObj");
266	List<WindowsMessage> seqVar = getStoredSeqVariable(obj);
267	if (msgsGenerated && seqVar.size() != generatedMessageSeq.size()) {
268	throw new InvalidParameterException(
269	"Failure generating replay sequence for rule "
270	+ currentRuleName
271	+ ": One or more of the sequence variables used to generate a sequence have different lenghts.");
272	}
273	for (WindowsMessage msg : seqVar) {
274	WindowsMessage currentSeqMsg = getCurrentSeqMsg(
275	generatedMessageSeq, msgsGenerated, constMsgType,
276	seqIterator);
277	String targetString = msg.getParameter(termElement
278	.getAttributeValue("param"));
279	currentSeqMsg.setXmlWindowDescription(targetString);
280	}
281	msgsGenerated = true;
282	} else { // const value
283	throw new AssertionError("target must be a sequence variable!");
284	/*
285	* If target would not be a variable, the message-elements could not
286	* yet be created and the whole sequence might be broken. If this is
287	* to be changed, createSequenceLParam and createSequenceWParam need
288	* to be addepted, too.
289	*/
290	}
291	return msgsGenerated;
292	}
293
294	private boolean createSequenceWParam(
295	List<WindowsMessage> generatedMessageSeq, boolean msgsGenerated,
296	int constMsgType, Element termElement)
297	throws NoSuchElementException {
298	Iterator<WindowsMessage> seqIterator = generatedMessageSeq.iterator();
299	if (termElement.getName().equals("seqValue")) {
300	String obj = termElement.getAttributeValue("seqObj");
301	List<WindowsMessage> seqVar = getStoredSeqVariable(obj);
302	if (msgsGenerated && seqVar.size() != generatedMessageSeq.size()) {
303	throw new InvalidParameterException(
304	"Failure generating replay sequence for rule "
305	+ currentRuleName
306	+ ": One or more of the sequence variables used to generate a sequence have different lenghts.");
307	}
308	for (WindowsMessage msg : seqVar) {
309	WindowsMessage currentSeqMsg = getCurrentSeqMsg(
310	generatedMessageSeq, msgsGenerated, constMsgType,
311	seqIterator);
312	String paramValueStr = msg.getParameter(termElement
313	.getAttributeValue("param"));
314	int paramValue = 0;
315	try {
316	paramValue = Integer.parseInt(paramValueStr);
317	currentSeqMsg.setWPARAM(paramValue);
318	} catch (NumberFormatException e) {
319	currentSeqMsg.setWPARAMasWindowDesc(paramValueStr);
320	}
321	}
322	if (seqIterator.hasNext()) {
323	// the first seq-var has a different number of elements than the
324	// current one
325	throw new NoSuchElementException();
326	}
327	msgsGenerated = true;
328	} else { // const value
329	int paramValue = Integer.parseInt(getTermValue(null, termElement));
330	while (seqIterator.hasNext()) {
331	seqIterator.next().setWPARAM(paramValue);
332	}
333	}
334	return msgsGenerated;
335	}
336
337	@SuppressWarnings("unchecked")
338	private boolean evalEqualRestrictions(WindowsMessage currentMessage,
339	Element messageElement) {
340	boolean isMatch = true;
341	for (Element childElement : (List<Element>) messageElement.getChildren(
342	"equals", rulesNamespace)) {
343	List<Element> termElements = childElement.getChildren();
344	// the size 2 of termElements is guaranteed by the XML schema
345	String value1 = getTermValue(currentMessage, termElements.get(0));
346	String value2 = getTermValue(currentMessage, termElements.get(1));
347	if (value1 == null \|\| value2 == null) {
348	isMatch = false;
349	} else {
350	isMatch = isMatch && value1.equals(value2);
351	}
352	}
353	for (Element childElement : (List<Element>) messageElement.getChildren(
354	"equalsSeq", rulesNamespace)) {
355	List<Element> termElements = childElement.getChildren();
356	List<String> values1 = getTermValueSeq(currentMessage,
357	termElements.get(0));
358	List<String> values2 = getTermValueSeq(currentMessage,
359	termElements.get(0));
360	if (values1 == null \|\| values2 == null) {
361	isMatch = false;
362	} else {
363	isMatch = isMatch && values1.equals(values2);
364	}
365	}
366	return isMatch;
367	}
368
369	@SuppressWarnings("unchecked")
370	private void generateReplayMessage(Element genMsgElement) {
371	List<Element> genMsgChildren = genMsgElement.getChildren();
372	WindowsMessage generatedMessage = null;
373	if (genMsgChildren.size() == 1) { // replay stored message without
374	// change
375	String obj = genMsgChildren.get(0).getAttributeValue("obj");
376	generatedMessage = getStoredMessageVariable(null, obj);
377	} else { // generate message according to the rule
378	for (Element genMsgChild : genMsgChildren) {
379	Element termElement = (Element) genMsgChild.getChildren()
380	.get(0);
381	if (genMsgChild.getName().equals("type")) {
382	try {
383	int msgType = Integer.parseInt(getTermValue(null,
384	termElement));
385	generatedMessage = new WindowsMessage(msgType);
386	} catch (NumberFormatException e) {
387	throw new InvalidParameterException(
388	"Failure generating replay sequence for rule "
389	+ currentRuleName
390	+ ": Defined type is not an integer.");
391	}
392	} else if (genMsgChild.getName().equals("target")) {
393	String targetString = getTermValue(null, termElement);
394	generatedMessage.setXmlWindowDescription(targetString);
395	} else if (genMsgChild.getName().equals("LPARAM")) {
396	String paramValueStr = getTermValue(null, termElement);
397	long paramValue = 0;
398	Element loword = genMsgChild.getChild("LOWORD", rulesNamespace);
399	if( loword!=null ) {
400	paramValue = loHiWord(genMsgChild);
401	generatedMessage.setLPARAM(paramValue);
402	} else {
403	try {
404	paramValue = Integer.parseInt(paramValueStr);
405	generatedMessage.setLPARAM(paramValue);
406	} catch (NumberFormatException e) {
407	generatedMessage.setLPARAMasWindowDesc(paramValueStr);
408	}
409	}
410	} else if (genMsgChild.getName().equals("WPARAM")) {
411	String paramValueStr = getTermValue(null, termElement);
412	long paramValue = 0;
413	Element loword = genMsgChild.getChild("LOWORD", rulesNamespace);
414	if( loword!=null ) {
415	paramValue = loHiWord(genMsgChild);
416	generatedMessage.setWPARAM(paramValue);
417	} else {
418	try {
419	paramValue = Integer.parseInt(paramValueStr);
420	generatedMessage.setWPARAM(paramValue);
421	} catch (NumberFormatException e) {
422	generatedMessage.setWPARAMasWindowDesc(paramValueStr);
423	}
424	}
425	}
426	}
427	}
428	if (generatedMessage != null) {
429	int delay = Integer.parseInt(genMsgElement
430	.getAttributeValue("delay"));
431	generatedMessage.setDelay(delay);
432	} else {
433	currentToken.invalidateReplay();
434	}
435	currentToken.addReplayEvent(generatedMessage);
436	}
437
438	@SuppressWarnings("unchecked")
439	private void generateReplaySequence(Element genMsgElement) {
440	List<Element> genMsgSeqChildren = genMsgElement.getChildren();
441	List<WindowsMessage> generatedMessageSeq = new LinkedList<WindowsMessage>();
442	if (genMsgSeqChildren.size() == 1) {
443	String obj = genMsgSeqChildren.get(0).getAttributeValue("seqObj");
444	generatedMessageSeq = getStoredSeqVariable(obj);
445	} else {
446	boolean msgsGenerated = false;
447	int constMsgType = 0;
448	for (Element genMsgSeqChild : genMsgSeqChildren) {
449	Element termElement = (Element) genMsgSeqChild.getChildren()
450	.get(0);
451	if (genMsgSeqChild.getName().equals("type")) {
452	// note: cannot easily be extracted because of mulitple
453	// return values
454	if (termElement.getName().equals("seqValue")) {
455	String obj = termElement.getAttributeValue("seqObj");
456	List<WindowsMessage> seqVar = getStoredSeqVariable(obj);
457	for (WindowsMessage msg : seqVar) {
458	generatedMessageSeq.add(new WindowsMessage(msg
459	.getType()));
460	}
461	msgsGenerated = true;
462	} else { // constValue type
463	constMsgType = Integer.parseInt(getTermValue(null,
464	termElement));
465	}
466	} else if (genMsgSeqChild.getName().equals("target")) {
467	msgsGenerated = createSequenceTarget(generatedMessageSeq,
468	msgsGenerated, constMsgType, termElement);
469	} else if (genMsgSeqChild.getName().equals("LPARAM")) {
470	msgsGenerated = createSequenceLParam(generatedMessageSeq,
471	msgsGenerated, constMsgType, termElement);
472	} else if (genMsgSeqChild.getName().equals("WPARAM")) {
473	msgsGenerated = createSequenceWParam(generatedMessageSeq,
474	msgsGenerated, constMsgType, termElement);
475	}
476	}
477	}
478	currentToken.addReplaySequence(generatedMessageSeq);
479	}
480
481	private WindowsMessage getCurrentSeqMsg(
482	List<WindowsMessage> generatedMessageSeq, boolean msgsGenerated,
483	int constMsgType, Iterator<WindowsMessage> seqIterator) {
484	WindowsMessage currentSeqMsg = null;
485	if (msgsGenerated) {
486	currentSeqMsg = seqIterator.next();
487	} else {
488	currentSeqMsg = new WindowsMessage(constMsgType);
489	generatedMessageSeq.add(currentSeqMsg);
490	}
491	return currentSeqMsg;
492	}
493
494	private WindowsMessage getStoredMessageVariable(
495	WindowsMessage currentMessage, String obj)
496	throws InvalidParameterException {
497	WindowsMessage varMessage = null;
498	if (obj.equals("this")) {
499	if (currentMessage == null) {
500	throw new InvalidParameterException(
501	"Failure obtaining term value for rule "
502	+ currentRuleName
503	+ ": \"this\" is not a valid name for generating runtime messages.");
504	}
505	varMessage = currentMessage;
506	} else {
507	Object tmp = messageStorage.get(obj);
508	if (tmp instanceof WindowsMessage) {
509	varMessage = (WindowsMessage) tmp;
510	} else {
511	throw new InvalidParameterException(
512	"Failure obtaining term value for rule "
513	+ currentRuleName + ": No message \"" + obj
514	+ "\" stored.");
515	}
516	}
517	return varMessage;
518	}
519
520	@SuppressWarnings("unchecked")
521	private List<WindowsMessage> getStoredSeqVariable(String obj)
522	throws InvalidParameterException {
523	List<WindowsMessage> varMsgSeq = null;
524	Object tmp = messageStorage.get(obj);
525	if (tmp instanceof List<?>) {
526	varMsgSeq = (List<WindowsMessage>) tmp;
527	} else {
528	throw new InvalidParameterException(
529	"Failure obtaining term value for rule " + currentRuleName
530	+ ": No sequence \"" + obj + "\" store.");
531	}
532	return varMsgSeq;
533	}
534
535	private String getTermValue(WindowsMessage currentMessage,
536	Element termElement) {
537	String value = null;
538	WindowsMessage varMessage = null;
539	if (termElement.getName().equals("constValue")) {
540	value = termElement.getAttributeValue("value");
541	} else if (termElement.getName().equals("paramValue")) {
542	String objectName = termElement.getAttributeValue("obj");
543	varMessage = getStoredMessageVariable(currentMessage, objectName);
544	if (varMessage != null) {
545	String param = termElement.getAttributeValue("param");
546	value = varMessage.getParameter(param);
547	}
548	} else if (termElement.getName().equals("winInfoValue")) {
549	String objectName = termElement.getAttributeValue("obj");
550	varMessage = getStoredMessageVariable(currentMessage, objectName);
551	if (varMessage != null) {
552	String paramString = termElement.getAttributeValue("winParam");
553	if (paramString.equals("class")) {
554	value = varMessage.getWindowClass();
555	} else if (paramString.equals("resourceId")) {
556	value = "" + varMessage.getWindowResourceId();
557	} else if (paramString.equals("hwnd")) {
558	value = "" + varMessage.getHwnd();
559	} else if (paramString.equals("parentTarget")) {
560	String target = varMessage.getXmlWindowDescription();
561	int index = target.lastIndexOf("<");
562	if( index==0 ) {
563	Console.println("Trying to adress parent of top-level window! Replay probably invalid!");
564	}
565	value = target.substring(0, index);
566	}
567	}
568	} else if (termElement.getName().equals("msgInfoValue")) {
569	String objectName = termElement.getAttributeValue("obj");
570	varMessage = getStoredMessageVariable(currentMessage, objectName);
571	if (varMessage != null) {
572	String paramString = termElement.getAttributeValue("msgParam");
573	if (paramString.equals("type")) {
574	value = "" + varMessage.getType();
575	} else if (paramString.equals("target")) {
576	value = varMessage.getXmlWindowDescription();
577	}
578	}
579	}
580	return value;
581	}
582
583	private List<String> getTermValueSeq(WindowsMessage currentMessage,
584	Element termElement) {
585	List<String> values = new LinkedList<String>();
586	if (termElement.getName().equals("seqValue")) {
587	String obj = termElement.getAttributeValue("seqObj");
588	String param = termElement.getAttributeValue("param");
589	List<WindowsMessage> seqVar = getStoredSeqVariable(obj);
590
591	for (WindowsMessage msg : seqVar) {
592	// msg.getParameter returns null, if parameter is not found,
593	// therefore the List can contain null-values
594	values.add(msg.getParameter(param));
595	}
596	}
597	return values;
598	}
599
600	@SuppressWarnings("unchecked")
601	private void handleStorage(Element messageElement,
602	WindowsMessage currentMessage) {
603	for (Element childElement : (List<Element>) messageElement.getChildren(
604	"store", rulesNamespace)) {
605	String identifier = childElement.getAttributeValue("var");
606	messageStorage.put(identifier, currentMessage);
607	resolveHwnd(currentMessage, childElement);
608	}
609	for (Element childElement : (List<Element>) messageElement.getChildren(
610	"storeSeq", rulesNamespace)) {
611	String identifier = childElement.getAttributeValue("varSeq");
612	Object tmp = messageStorage.get(identifier);
613	List<WindowsMessage> storedSequence;
614	if (tmp == null \|\| tmp instanceof WindowsMessage) {
615	storedSequence = new LinkedList<WindowsMessage>();
616	storedSequence.add(currentMessage);
617	messageStorage.put(identifier, storedSequence);
618	} else if (tmp instanceof List<?>) {
619	storedSequence = (List<WindowsMessage>) tmp;
620	storedSequence.add(currentMessage);
621	messageStorage.put(identifier, storedSequence);
622	}
623	resolveHwnd(currentMessage, childElement);
624	}
625	}
626
627	private boolean matchMultipleMessages(Element messageElement,
628	Element nextMessageElement) {
629	boolean isMatch = false;
630	boolean isCurrentMatch = false;
631	boolean nextMatchFound = false;
632	WindowsMessage currentMessage = null;
633	WindowsMessage nextMessage = null;
634
635	int type = Integer.parseInt(messageElement.getAttributeValue("type"));
636
637	int nextType = -1;
638	if (nextMessageElement != null) {
639	nextType = Integer.parseInt(nextMessageElement
640	.getAttributeValue("type"));
641	}
642
643	while (!nextMatchFound && sequenceIterator.hasNext()) {
644	currentMessage = sequenceIterator.next();
645	if (type == currentMessage.getType()) {
646	isCurrentMatch = evalEqualRestrictions(currentMessage,
647	messageElement);
648	isMatch = isMatch \|\| isCurrentMatch;
649
650	if (isCurrentMatch) {
651	handleStorage(messageElement, currentMessage);
652	currentToken.setTarget(currentMessage
653	.getXmlWindowDescription());
654	currentToken
655	.setTargetShort(currentMessage.getParentNames());
656	}
657	}
658	if (nextMessageElement != null && isMatch) {
659	// peek next message to check if the sequence ends and the next
660	// match is found
661	if (!sequenceIterator.hasNext()) {
662	return false; // sequence is over, but not all messages are
663	// found
664	}
665	nextMessage = sequenceIterator.next();
666	sequenceIterator.previous();
667
668	if (nextType == nextMessage.getType()) {
669	nextMatchFound = evalEqualRestrictions(nextMessage,
670	nextMessageElement);
671	}
672
673	}
674	}
675
676	return isMatch;
677	}
678
679	private boolean matchSingleMessage(Element messageElement) {
680	boolean isMatch = false;
681	WindowsMessage currentMessage = null;
682
683	int type = Integer.parseInt(messageElement.getAttributeValue("type"));
684
685	while (!isMatch && sequenceIterator.hasNext()) {
686	// traverses the messages from the current position forward till a
687	// message with the correct type is found
688	currentMessage = sequenceIterator.next();
689	if (type == currentMessage.getType()) {
690	// message with the correct type found
691	// eval child nodes for further matching/storing
692	isMatch = evalEqualRestrictions(currentMessage, messageElement);
693
694	// in case the message is a match, eval storage children
695	if (isMatch) {
696	handleStorage(messageElement, currentMessage);
697	currentToken.setTarget(currentMessage
698	.getXmlWindowDescription());
699	currentToken
700	.setTargetShort(currentMessage.getParentNames());
701	}
702	}
703	}
704
705	return isMatch;
706	}
707
708	@SuppressWarnings("unchecked")
709	private void resolveHwnd(WindowsMessage currentMessage, Element childElement) {
710	List<Element> resolveElements = childElement.getChildren("resolveHwnd",
711	rulesNamespace);
712	for (Element resolveElement : resolveElements) {
713	String param = resolveElement.getAttributeValue("param");
714	String storeParam = resolveElement.getAttributeValue("storeParam");
715	int paramHwnd = Integer
716	.parseInt(currentMessage.getParameter(param));
717	WindowTreeNode node = WindowTree.getInstance().find(paramHwnd);
718	if (node != null) {
719	currentMessage.addParameter(storeParam,
720	node.xmlRepresentation());
721	}
722	}
723	}
724
725	private long loHiWord(Element param) {
726	Element loword = param.getChild("LOWORD", rulesNamespace);
727	Element hiword = param.getChild("HIWORD", rulesNamespace);
728	String lowordStr = getTermValue(null, (Element) loword.getChildren().get(0));
729	String hiwordStr = getTermValue(null, (Element) hiword.getChildren().get(0));
730	return MAKEPARAM(Short.parseShort(lowordStr), Short.parseShort(hiwordStr));
731	}
732
733	private static int MAKEPARAM(short loword, short hiword) {
734	return loword\| ((int) hiword) << Short.SIZE;
735	}
736
737	}

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