source: trunk/EventBenchConsole/src/de/ugoe/cs/eventbench/windows/LogParser.java @ 171

package de.ugoe.cs.eventbench.windows;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.security.InvalidParameterException;
import java.util.LinkedList;
import java.util.List;
import java.util.SortedMap;
import java.util.TreeMap;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;

import de.ugoe.cs.eventbench.windows.data.WindowTree;
import de.ugoe.cs.eventbench.windows.data.WindowsMessage;
import de.ugoe.cs.util.StringTools;
import de.ugoe.cs.util.console.Console;

/**
 * <p>
 * This class provides functionality to parse XML log files generated by the
 * MFCUsageMonitor of EventBench. The result of parsing a file is a collection
 * of event sequences. It uses the {@link SequenceSplitter} and the
 * {@link EventGenerator} as well as custom defined {@link MessageHandler} for
 * the parsing.
 * </p>
 * 
 * @author Steffen Herbold
 * @version 1.0
 */
public class LogParser extends DefaultHandler {

        /**
         * <p>
         * If a custom message handler is used, this field contains its handle.
         * Otherwise this field is {@code null}.
         * </p>
         */
        private MessageHandler currentHandler;

        /**
         * <p>
         * Handle to the message that is currently parsed.
         * </p>
         */
        private WindowsMessage currentMessage;

        /**
         * <p>
         * {@link SequenceSplitter} instance used by the {@link LogParser}.
         * </p>
         */
        private SequenceSplitter sequenceSplitter;

        /**
         * <p>
         * Collection of event sequences that is contained in the log file, which is
         * parsed.
         * </p>
         */
        private List<List<WindowsEvent>> sequences;

        /**
         * <p>
         * Debugging variable that allows the analysis which message type occurs how
         * often in the log file. Can be used to enhance the message filter.
         * </p>
         */
        private SortedMap<Integer, Integer> typeCounter;

        /**
         * <p>
         * Debugging variable that enables the counting of the occurrences of each
         * message. Used in combination with {@link #typeCounter}.
         * </p>
         */
        private boolean countMessageOccurences;

        /**
         * <p>
         * Constructor. Creates a new LogParser that does not count message
         * occurrences.
         * </p>
         */
        public LogParser() {
                this(false);
        }

        /**
         * <p>
         * Constructor. Creates a new LogParser.
         * </p>
         * 
         * @param countMessageOccurences
         *            if true, the occurrences of each message type in the log is
         *            counted.
         */
        public LogParser(boolean countMessageOccurences) {
                sequenceSplitter = new SequenceSplitter();
                sequences = new LinkedList<List<WindowsEvent>>();
                currentHandler = null;
                this.countMessageOccurences = countMessageOccurences;
                if (countMessageOccurences) {
                        typeCounter = new TreeMap<Integer, Integer>();
                }

        }

        /**
         * <p>
         * Returns the collection of event sequences that is obtained from parsing
         * log files.
         * </p>
         * 
         * @return collection of event sequences
         */
        public List<List<WindowsEvent>> getSequences() {
                return sequences;
        }

        /*
         * (non-Javadoc)
         * 
         * @see org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String,
         * java.lang.String, java.lang.String, org.xml.sax.Attributes)
         */
        @Override
        public void startElement(String uri, String localName, String qName,
                        Attributes atts) throws SAXException {
                if (qName.equals("session")) {
                        Console.traceln("start of session");
                        sequenceSplitter = new SequenceSplitter();
                } else if (qName.equals("msg")) {
                        String msgType = atts.getValue("type");
                        int msgInt = -1;
                        try {
                                msgInt = Integer.parseInt(msgType);

                                if (countMessageOccurences) {
                                        Integer currentCount = typeCounter.get(msgInt);
                                        if (currentCount == null) {
                                                typeCounter.put(msgInt, 1);
                                        } else {
                                                typeCounter.put(msgInt, currentCount + 1);
                                        }
                                }

                                if (msgInt == MessageDefs.WM_CREATE) {
                                        currentHandler = new HandlerCreate();
                                        currentHandler.onStartElement();
                                } else if (msgInt == MessageDefs.WM_DESTROY) {
                                        currentHandler = new HandlerDestroy();
                                        currentHandler.onStartElement();
                                } else if (msgInt == MessageDefs.WM_SETTEXT) {
                                        currentHandler = new HandlerSetText();
                                        currentHandler.onStartElement();
                                } else {
                                        currentMessage = new WindowsMessage(msgInt);
                                }
                        } catch (NumberFormatException e) {
                                Console.printerrln("Invalid message type: type not a number");
                                e.printStackTrace();
                        }
                } else if (qName.equals("param")) {
                        if (currentHandler != null) {
                                currentHandler.onParameter(atts.getValue("name"),
                                                atts.getValue("value"));
                        } else {
                                currentMessage.addParameter(atts.getValue("name"),
                                                atts.getValue("value"));
                        }
                }
        }

        /*
         * (non-Javadoc)
         * 
         * @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String,
         * java.lang.String, java.lang.String)
         */
        @Override
        public void endElement(String uri, String localName, String qName)
                        throws SAXException {
                if (qName.equals("msg")) {
                        if (currentHandler != null) {
                                currentHandler.onEndElement();
                                currentHandler = null;
                        } else {
                                try {
                                        currentMessage.setTarget(WindowTree.getInstance());
                                        sequenceSplitter.addMessage(currentMessage);
                                } catch (InvalidParameterException e) {
                                        Console.traceln(e.getMessage() + " WindowsMessage "
                                                        + currentMessage + " ignored.");
                                }
                        }
                } else if (qName.equals("session")) {
                        sequenceSplitter.endSession();
                        sequences.add(sequenceSplitter.getSequence());
                        Console.traceln("end of session");
                }
        }

        /**
         * <p>
         * Parses a given log file and adds its contents to the collection of event
         * sequences.
         * </p>
         * 
         * @param filename
         *            name and path of the log file
         */
        public void parseFile(String filename) {
                if (filename == null) {
                        throw new InvalidParameterException("filename must not be null");
                }

                SAXParserFactory spf = SAXParserFactory.newInstance();
                spf.setValidating(true);

                SAXParser saxParser = null;
                InputSource inputSource = null;
                try {
                        saxParser = spf.newSAXParser();
                        inputSource = new InputSource(new InputStreamReader(
                                        new FileInputStream(filename), "UTF-16"));
                } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                } catch (ParserConfigurationException e) {
                        e.printStackTrace();
                } catch (SAXException e) {
                        e.printStackTrace();
                } catch (FileNotFoundException e) {
                        e.printStackTrace();
                }
                if (inputSource != null) {
                        inputSource.setSystemId("file://"
                                        + new File(filename).getAbsolutePath());
                        try {
                                if (saxParser == null) {
                                        throw new RuntimeException("SAXParser creation failed");
                                }
                                saxParser.parse(inputSource, this);
                        } catch (SAXParseException e) {
                                Console.printerrln("Failure parsing file in line "
                                                + e.getLineNumber() + ", column " + e.getColumnNumber()
                                                + ".");
                                e.printStackTrace();
                        } catch (SAXException e) {
                                e.printStackTrace();
                        } catch (IOException e) {
                                e.printStackTrace();
                        }
                }
                if (countMessageOccurences) {
                        Console.println("Message statistics:");
                        Console.println(typeCounter.toString()
                                        .replace(" ", StringTools.ENDLINE)
                                        .replaceAll("[\\{\\}]", ""));
                }
        }
}