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package org.monkey.comparator.bo;
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class XMLParser {
/*
* The method parses Monkey's XML Bug Report.
* The following is an example the XML file the method expects for parsing
* <?xml version="1.0"?>
<crash category="npe" function="crashFunction" line="14" file="bug_null_pointer_exception.c" >
<history>
<epoch step="0" >
<trace>
<function name="crashFunction" line="14" file="bug_null_pointer_exception.c" depth="0" >
<expressions>
<expression name="crashStruct" >NULL</expression>
</expressions>
</function>
</trace>
</epoch>
</history>
</crash>
*/
public static Bug parse(String filePath) {
Bug bug = new Bug();
try {
NodeList epochNodeList;
NodeList traceNodeList;
NodeList functionNodeList;
NodeList expressionNodeList;
NodeList tmpNodeList;
Node epochNode;
Node traceNode;
Node functionNode;
Node expressionNode;
Node tmpNode = null;
Element element;
Epoch epoch = null;
Function function = null;
Expression expression = null;
File xmlFile = new File(filePath);
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory
.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory
.newDocumentBuilder();
Document document = documentBuilder.parse(xmlFile);
document.getDocumentElement().normalize();
/* Setting Bug Attributes */
element = document.getDocumentElement(); /*
* This should be the crash
* node
*/
bug.setCategory(element.getAttribute("category"));
bug.setFileName(element.getAttribute("file"));
bug.setFunctionName(element.getAttribute("function"));
bug.setLineNo(Integer.parseInt(element.getAttribute("line")));
/* History is consisting of a list of epoch nodes */
epochNodeList = document.getElementsByTagName("epoch");
//printAllNodes(epochNodeList);
for (int i = 0; i < epochNodeList.getLength(); i++) {
epochNode = epochNodeList.item(i);
if (epochNode.getNodeType() == Node.ELEMENT_NODE) {
epoch = new Epoch();
bug.insertEpoch(epoch);
epoch.setEpochStep(Integer.parseInt(epochNode
.getAttributes().getNamedItem("step")
.getNodeValue()));
/* Get the list of trace nodes for this epoch node */
traceNodeList = epochNode.getChildNodes();
for (int j = 0; j < traceNodeList.getLength(); j++) {
/* Get the list of function nodes for this trace node */
traceNode = traceNodeList.item(j);
if (traceNode.getNodeType() == Node.ELEMENT_NODE) {
functionNodeList = traceNode.getChildNodes();
for (int k = 0; k < functionNodeList.getLength(); k++) {
functionNode = functionNodeList.item(k);
if (functionNode.getNodeType() == Node.ELEMENT_NODE) {
function = new Function();
epoch.insertFunction(function);
function.setFunctionName(functionNode
.getAttributes()
.getNamedItem("name")
.getNodeValue());
function.setLineNo(Integer
.parseInt(functionNode
.getAttributes()
.getNamedItem("line")
.getNodeValue()));
function.setFileName(functionNode
.getAttributes()
.getNamedItem("file")
.getNodeValue());
/*
* Get the list of expression nodes for this
* function
*/
tmpNodeList = functionNode.getChildNodes();
for (int t = 0; t < tmpNodeList.getLength(); t++) { // skipping the
// unnecessary
// node
// named
// <expressions></expressions>
tmpNode = tmpNodeList.item(t);
if (tmpNode.getNodeName().equals("expressions"))
break;
}
expressionNodeList = tmpNode.getChildNodes();
for (int l = 0; l < expressionNodeList
.getLength(); l++) {
expressionNode = expressionNodeList
.item(l);
if (expressionNode.getNodeType() == Node.ELEMENT_NODE) {
expression = new Expression();
function.insertExpression(expression);
expression.setName(expressionNode
.getAttributes()
.getNamedItem("name")
.getNodeValue());
expression.setValue(expressionNode
.getTextContent());
}
}
} // end if functionNode
} // end for functionNodeList
} // end if traceNode
} // end for traceNodeList
} // end if epochNode
} // end for epochNodeList
} catch (Exception e) {
System.err.println("Fatal error: unable to parse XML file. Entomologist will exit now.");
e.printStackTrace();
System.exit(1);
}
return bug;
}
public static void printBug(Bug bug) {
Epoch epoch;
Function function;
Expression expression;
System.out.println("Bug:");
System.out.println("---------");
System.out.println("Category: " + bug.getCategory());
System.out.println("File Name: " + bug.getFileName());
System.out.println("Function Name: " + bug.getFunctionName());
System.out.println("Line Number: " + bug.getLineNo());
System.out.println("------------------------------------------------------");
for (int i = 0; i < bug.getEpochNum(); i++) {
epoch = bug.getEpoch(i);
System.out.println("Epoch Step: " + epoch.getEpochStep());
System.out.println("---------------");
for (int j = 0; j < epoch.getFunctionNum(); j++) {
function = epoch.getFunction(j);
System.out.println("Function: " + function.getFunctionName() + " file: " + function.getFileName() + " Lineno." + function.getLineNo());
System.out.println("-----------------------------------------------------");
for (int k = 0; k < function.getExpressionNum(); k++) {
expression = function.getExpression(k);
System.out.println(expression.getName() + " = " + expression.getValue());
}
System.out.println("");
}
System.out.println("");
}
}
// This method is used for debugging
/*
private static void printAllNodes(NodeList nodeList) {
NodeList childNodes;
for (int i = 0; i < nodeList.getLength(); i++) {
if (nodeList.item(i).getNodeType() == Node.ELEMENT_NODE) {
System.out.println(nodeList.item(i).getNodeName() + " type ="
+ nodeList.item(i).getNodeType());
childNodes = nodeList.item(i).getChildNodes();
printAllNodes(childNodes);
}
}
}
*/
}
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