at.general.solutions.android.ical.parser.ICalParserThread.java Source code

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Here is the source code for at.general.solutions.android.ical.parser.ICalParserThread.java

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/*
*    Copyright (C) 2010  Florian Falkner - ICal Synch for Android Smartphones
*
*    This program is free software: you can redistribute it and/or modify
*    it under the terms of the GNU General Public License as published by
*    the Free Software Foundation, either version 3 of the License, or
*    (at your option) any later version.
*
*    This program is distributed in the hope that it will be useful,
*    but WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*    GNU General Public License for more details.
*
*    You should have received a copy of the GNU General Public License
*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
*/
package at.general.solutions.android.ical.parser;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

import org.apache.commons.lang.StringUtils;

import android.util.Log;
import at.general.solutions.android.ical.activity.R;
import at.general.solutions.android.ical.model.ICalEvent;
import at.general.solutions.android.ical.utility.PreferencesUtility;
import at.general.solutions.android.ical.utility.ProgressThread;

public class ICalParserThread extends ProgressThread {
    private static final String LOG_TAG = "IcalParser";

    /* Ical Dateformat */
    private static SimpleDateFormat ICAL_DATETIME_FORMAT = new SimpleDateFormat("yyyyMMdd'T'HHmmss");
    private static SimpleDateFormat ICAL_DATE_FORMAT = new SimpleDateFormat("yyyyMMdd");

    private TimeZone icalDefaultTimeZone;
    private TimeZone userTimeZone;
    private String toParse;

    public ICalParserThread(String icalDefaultTimeZone, String userTimeZone, String toParse) {
        if (icalDefaultTimeZone.equalsIgnoreCase(PreferencesUtility.DEFAULT_TIMEZONE_PREF_VALUE)) {
            this.icalDefaultTimeZone = TimeZone.getTimeZone("UTC");
        } else {
            this.icalDefaultTimeZone = TimeZone.getTimeZone(icalDefaultTimeZone);
        }

        if (userTimeZone.equals(PreferencesUtility.DEFAULT_TIMEZONE_PREF_VALUE)) {
            this.userTimeZone = TimeZone.getDefault();
        } else {
            this.userTimeZone = TimeZone.getTimeZone(userTimeZone);
        }

        ICAL_DATETIME_FORMAT.setTimeZone(this.icalDefaultTimeZone);
        ICAL_DATE_FORMAT.setTimeZone(this.icalDefaultTimeZone);

        this.toParse = toParse;
    }

    @Override
    public void run() {
        super.sendInitMessage(R.string.parsingIcalFile);

        String[] lines = toParse.split("\n");

        super.sendMaximumMessage(lines.length);

        ICalEvent event = null;

        int i = 0;

        boolean inDescription = false;
        String description = "";

        for (String line : lines) {
            line = StringUtils.chomp(line);

            if (event == null) {
                if (line.contains(ICalTag.EVENT_START)) {
                    event = new ICalEvent(userTimeZone);
                }
                inDescription = false;
            } else if (line.contains(ICalTag.EVENT_END)) {
                event.setDescription(cleanText(description));

                if (event != null && event.getStart() != null) {
                    super.sendProgressMessage(i, event);
                }
                event = null;
                description = "";
                inDescription = false;
            } else {
                if (line.contains(ICalTag.EVENT_SUMMARY)) {
                    event.setSummary(cleanText(line.substring(ICalTag.EVENT_SUMMARY.length())));
                } else if (line.contains(ICalTag.EVENT_DATE_START)) {
                    String dateLine = line.substring(ICalTag.EVENT_DATE_START.length());
                    event.setStart(parseIcalDate(dateLine));
                } else if (line.contains(ICalTag.EVENT_DATE_END)) {
                    String dateLine = line.substring(ICalTag.EVENT_DATE_END.length());
                    event.setEnd(parseIcalDate(dateLine));
                }

                if (inDescription) {
                    if (line.charAt(0) == ' ') {
                        description += line.substring(1);
                    }
                } else if (line.contains(ICalTag.EVENT_DESCRIPTION)) {
                    description = line.substring(ICalTag.EVENT_DESCRIPTION.length());
                    inDescription = true;
                } else {
                    inDescription = false;
                }
            }
            i++;
        }

        super.sendFinishedMessage();
    }

    private String cleanText(String text) {
        text = StringUtils.replace(text, "\\n", "\n");
        text = StringUtils.replace(text, "\\,", ",");
        text = StringUtils.replace(text, "\\\"", "\"");
        return text;
    }

    private Date parseIcalDate(String dateLine) {
        try {
            dateLine = StringUtils.replace(dateLine, ";", "");
            Date date = null;
            if (dateLine.contains(ICalTag.DATE_TIMEZONE)) {
                String[] parts = StringUtils.split(dateLine, ":");
                ICAL_DATETIME_FORMAT.setTimeZone(TimeZone
                        .getTimeZone(parts[0].substring(ICalTag.DATE_TIMEZONE.length(), parts[0].length())));
                date = ICAL_DATETIME_FORMAT.parse(parts[1]);
                ICAL_DATETIME_FORMAT.setTimeZone(icalDefaultTimeZone);
            } else if (dateLine.contains(ICalTag.DATE_VALUE)) {
                String[] parts = StringUtils.split(dateLine, ":");
                date = ICAL_DATE_FORMAT.parse(parts[1]);
                date.setHours(0);
                date.setMinutes(0);
                date.setSeconds(0);
            } else {
                dateLine = StringUtils.replace(dateLine, ":", "");
                date = ICAL_DATETIME_FORMAT.parse(dateLine);
            }
            return date;
        } catch (ParseException e) {
            Log.e(LOG_TAG, "Cant't parse date!", e);
            return null;
        }
    }

}