source: trunk/gsdl3/src/java/org/greenstone/gsdl3/gs3build/metadata/METSDate.java@ 8699

package org.greenstone.gsdl3.gs3build.metadata;

public class METSDate
{
    String era;
    String year;
    String month;
    String day;
    String hour;
    String minute;
    String second;
    String timezone;

    public void METSDate(String string)
    {   String date;

        int timeAt = string.indexOf('T');

        // if we've got a time signature, get it
        if (timeAt >= 0) {
          // get the date for later use
            date = string.substring(0, timeAt);

            // extract the time string
            String time = string.substring(timeAt+1);

            // check for time zone usage - currently '+' and '-' only...
            int zoneAt = time.indexOf('+');
            if (zoneAt == -1) { 
                zoneAt = time.indexOf('-');
            }
            if (zoneAt >= 0) {
                this.timezone = time.substring(zoneAt);
                time = time.substring(0, zoneAt);
            }

            // finally, divide into hours, minutes etc.
            int hourAt = time.indexOf(':');
            if (hourAt >= 0) {
                this.hour = time.substring(0, hourAt);

                time = time.substring(hourAt+1);
                int minuteAt = time.indexOf(':');
                if (minuteAt >= 0)
                {   this.minute = time.substring(0, minuteAt);
                    this.second = time.substring(minuteAt+1);
                }
                else
                { this.minute = time;
                    this.second = null;
                }
            }
        }
        else 
        { this.timezone = null;
            this.hour     = null;
            this.minute   = null;
            this.second   = null;

            date = string;
        }

        // get the era
        int prefixEnds = 0;
        while (!Character.isDigit(date.charAt(prefixEnds)))
        { prefixEnds ++;
        }

        if (prefixEnds != 0) {
            this.era = date.substring(0, prefixEnds);
            date = date.substring(prefixEnds);
        }
        else {
            this.era = null;
        }

        // finally, get the date
        
        // now try dividing up by '-'
        int yearAt = date.indexOf('-');
        if (yearAt >= 0) {
            this.year = date.substring(0, yearAt);
            date = date.substring(yearAt+1);

            int monthAt = date.indexOf('-');
            if (monthAt >= 0) {
                this.month = date.substring(0, monthAt);
                this.day = date.substring(monthAt+1);
            }
            else {
                this.month = date;
                this.day   = null;
            }
        }
        else {
            // try dividing by YYYYMMDD - any part of which may be missing...
            if (date.length() >= 4) {
                this.year = date.substring(0, 4);
                if (date.length() >= 6) {
                    this.month = date.substring(4, 6);
                    this.day = date.substring(6);
                }
                else {
                    this.month = date.substring(4);
                    this.day   = null;
                }
            }
            // we just have a day in this case...
            else {
                this.year = date;
                this.month = null;
                this.day = null;
            }
        }
    }

    public String toString()
    {   if (this.year == null) {
            return "";
        }

        StringBuffer buffer = new StringBuffer();

        if (this.era != null) {
            buffer.append(era);
        }
        buffer.append(year);
        if (this.month != null) {
            buffer.append("-");
            buffer.append(this.month);
            if (this.day != null) {
                buffer.append("-");
                buffer.append(this.day);

                if (this.hour != null) {
                    buffer.append("T");
                    buffer.append(this.hour);
                    buffer.append(":");
                    buffer.append(this.minute);
                    if (this.second != null) {
                        buffer.append(":");
                        buffer.append(this.second);

                        if (this.timezone != null) {
                            buffer.append(this.timezone);
                        }
                    }
                }
            }
        }
        return buffer.toString();
    }
}