Example usage for org.jfree.data.time Month evaluateAsYear

Introduction

In this page you can find the example usage for org.jfree.data.time Month evaluateAsYear.

Prototype

private static Year evaluateAsYear(String s) 

Source Link

Document

Creates a year from a string, or returns null (format exceptions suppressed).

Usage

From source file:org.jfree.data.time.Month.java

/**
 * Parses the string argument as a month.  This method is required to
 * accept the format "YYYY-MM".  It will also accept "MM-YYYY". Anything
 * else, at the moment, is a bonus./*from   w w w.  j  a v a2  s.  co m*/
 *
 * @param s  the string to parse (<code>null</code> permitted).
 *
 * @return <code>null</code> if the string is not parseable, the month
 *         otherwise.
 */
public static Month parseMonth(String s) {
    Month result = null;
    if (s == null) {
        return result;
    }
    // trim whitespace from either end of the string
    s = s.trim();
    int i = Month.findSeparator(s);
    String s1, s2;
    boolean yearIsFirst;
    // if there is no separator, we assume the first four characters
    // are YYYY
    if (i == -1) {
        yearIsFirst = true;
        s1 = s.substring(0, 5);
        s2 = s.substring(5);
    } else {
        s1 = s.substring(0, i).trim();
        s2 = s.substring(i + 1, s.length()).trim();
        // now it is trickier to determine if the month or year is first
        Year y1 = Month.evaluateAsYear(s1);
        if (y1 == null) {
            yearIsFirst = false;
        } else {
            Year y2 = Month.evaluateAsYear(s2);
            if (y2 == null) {
                yearIsFirst = true;
            } else {
                yearIsFirst = (s1.length() > s2.length());
            }
        }
    }
    Year year;
    int month;
    if (yearIsFirst) {
        year = Month.evaluateAsYear(s1);
        month = SerialDate.stringToMonthCode(s2);
    } else {
        year = Month.evaluateAsYear(s2);
        month = SerialDate.stringToMonthCode(s1);
    }
    if (month == -1) {
        throw new TimePeriodFormatException("Can't evaluate the month.");
    }
    if (year == null) {
        throw new TimePeriodFormatException("Can't evaluate the year.");
    }
    result = new Month(month, year);
    return result;
}

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