source: trunk/org/expeditee/io/Logger.java@ 4

package org.expeditee.io;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.expeditee.gui.TimeKeeper;

/**
 * This class is used to create all log files. The log file is opened, appended,
 * and closed for each new entry to ensure robustness against program crashes.
 * Files are created with filename: UserData.Date.Time<br>
 * Where Date is in the format DDMMMYYYY and Time is in the format HHMM. <br>
 * <br>
 * Log files are stored in the following format: <br>
 * <code>
 * TIME: (Time since program start) <br>
 * X,Y (For user events only) <br> 
 * Origin (System/User) <br>
 * Description <br>
 * </code> <br>
 * Exceptions can also be logged, in which case the result from
 * Exception.printStackTrace() is output to the file.
 * 
 * @author jdm18
 * 
 */
public class Logger {
        public static final String SYSTEM = "S";

        public static final String USER = "U";

        public static final String LOAD = "Load";

        public static final String SAVE = "Save";

        public static final String PICKUP = "Pickup";

        public static final String ANCHOR = "Anchor";

        public static final String DELETE = "Delete";

        public static final String TDFC = "TDFC";

        public static final String NEW_FRAMESET = "New Frameset";

        public static final String PICKUP_COPY = "Pickup Copies";

        public static final String ANCHOR_COPY = "Anchor Copies";

        public static final String CONTROL_CHAR = "Control Character";

        public static final String CREATE_TEXT = "Creating Text";

        public static final String INSERTING_TEXT = "Inserting Text";

        public static final String BACK = "Back";

        public static final String FOLLOW_LINK = "Following Link";

        public static final String MERGING = "Merging";

        // These should be the same as used in KMSReader
        private static String _filename = null;

        // how many spaces the output time should be padded to
        private static int _padTime = 8;

        private static TimeKeeper _timer = new TimeKeeper();

        /**
         * Sets the path on disk that the log files will be created in
         * 
         * @param location
         *            The path on disk to create the log files in.
         */
        public static void Init() {
                if (!org.expeditee.gui.UserSettings.Logging)
                        return;

                File test = new File(org.expeditee.gui.FrameIO.LOGS_DIR);
                if (!test.exists())
                        test.mkdir();

                _filename = "UserData-" + EasyDateFormat("ddMMMyy-HHmm") + ".txt";
        }

        /**
         * Appends the given event to the log file.
         * 
         * @param origin
         *            The origin of this event, typically SYSTEM
         * @param type
         *            The Type of this event (LOAD, SAVE, CLICK, etc)
         * @param comments
         *            Any further comments that should be recorded about the event
         */
        public static void Log(String origin, String type, String comments) {
                String toWrite = "TIME:\t" + _timer.getElapsedStringMillis(_padTime)
                                + " \t\t\t\t" + " - " + origin + " - " + type + " - "
                                + comments;
                WriteToFile(toWrite);
        }

        /**
         * Appends the given event to the log file.
         * 
         * @param x
         *            The mouse X coordinate when the event occured
         * @param y
         *            The mouse Y coordinate when the event occured
         * @param origin
         *            The origin of the event, typically USER
         * @param type
         *            The type of this event (LOAD, SAVE, CLICK, etc).
         * @param comments
         *            Any further comments that should be recorded about the event
         */
        public static void Log(int x, int y, String origin, String type,
                        String comments) {
                String toWrite = "TIME:\t" + _timer.getElapsedStringMillis(_padTime)
                                + " \t X:" + x + " Y:" + y + " - " + origin + " - " + type
                                + " - " + comments;
                WriteToFile(toWrite);
        }

        /**
         * Appends a record of the Exception to the log file. The text output is
         * equal to that output by e.printStackTrace()
         * 
         * @param e
         *            The Exception to log.
         */
        public static void Log(Exception e) {
                String toWrite = "TIME:" + _timer.getElapsedStringMillis(_padTime)
                                + "\tException Thrown: " + e.getClass().getSimpleName();

                WriteToFile(toWrite);

                StackTraceElement[] st = e.getStackTrace();

                for (StackTraceElement element : st)
                        WriteToFile(element.toString());

        }

        public static String EasyDateFormat(String format, Date date) {
                return (new SimpleDateFormat(format)).format(date);
        }

        public static String EasyDateFormat(String format) {
                return EasyDateFormat(format, new Date());
        }

        private static void WriteToFile(String toWrite) {
                if (!org.expeditee.gui.UserSettings.Logging)
                        return;

                // if Init has not been run yet
                if (_filename == null)
                        Init();

                try {
                        BufferedWriter writer = new BufferedWriter(new FileWriter(
                                        org.expeditee.gui.FrameIO.LOGS_DIR + _filename, true));
                        writer.write(toWrite);
                        writer.newLine();

                        writer.flush();
                        writer.close();
                } catch (IOException ioe) {
                        ioe.printStackTrace();
                }

        }

}