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*/
package com.google.refine.expr.functions;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Properties;
import org.json.JSONException;
import org.json.JSONWriter;
import com.google.refine.expr.EvalError;
import com.google.refine.expr.util.CalendarParser;
import com.google.refine.expr.util.CalendarParserException;
import com.google.refine.grel.Function;
import com.google.refine.util.ParsingUtilities;
public class ToDate implements Function {
@Override
public Object call(Properties bindings, Object[] args) {
if (args.length == 0) {
// missing value, can this happen?
return null;
}
Object arg0 = args[0];
String o1;
if (arg0 instanceof Date) {
return arg0;
} else if (arg0 instanceof Calendar) {
return ((Calendar) arg0).getTime();
} else if (arg0 instanceof Long) {
o1 = ((Long) arg0).toString(); // treat integers as years
} else if (arg0 instanceof String) {
o1 = (String) arg0;
} else {
// ignore cell values that aren't strings
return new EvalError("Not a String - cannot parse to date");
}
// "o, boolean month_first (optional)"
if (args.length == 1 || (args.length == 2 && args[1] instanceof Boolean)) {
boolean month_first = true;
if (args.length == 2) {
month_first = (Boolean) args[1];
}
try {
return CalendarParser.parse( o1, (month_first) ? CalendarParser.MM_DD_YY : CalendarParser.DD_MM_YY);
} catch (CalendarParserException e) {
Date d = ParsingUtilities.stringToDate(o1);
if (d != null) {
return d;
} else {
try {
return javax.xml.bind.DatatypeConverter.parseDateTime(o1).getTime();
} catch (IllegalArgumentException e2) {
}
// alternate implementation which may be useful on some JVMs?
// try {
// return javax.xml.datatype.DatatypeFactory.newInstance().newXMLGregorianCalendar(o1).toGregorianCalendar().getTime();
// } catch (DatatypeConfigurationException e2) {
// }
}
return new EvalError("Cannot parse to date");
}
}
// "o, format1, format2 (optional), ..."
if (args.length>=2) {
for (int i=1;i<args.length;i++) {
if (!(args[i] instanceof String)) {
// skip formats that aren't strings
continue;
}
String format = (String) args[i];
SimpleDateFormat formatter;
try {
formatter = new SimpleDateFormat(format);
} catch (IllegalArgumentException e) {
return new EvalError("Unknown date format");
}
Date date = null;
try {
date = formatter.parse(o1);
} catch (java.text.ParseException e) {
continue;
}
if (date != null) {
GregorianCalendar c = new GregorianCalendar();
c.setTime(date);
return c;
}
}
return new EvalError("Unable to parse as date");
}
return null;
}
@Override
public void write(JSONWriter writer, Properties options)
throws JSONException {
writer.object();
writer.key("description"); writer.value("Returns o converted to a date object, you can hint if the day or the month is listed first, or give an ordered list of possible formats using this syntax: http://java.sun.com/j2se/1.4.2/docs/api/java/text/SimpleDateFormat.html");
writer.key("params"); writer.value("o, boolean month_first / format1, format2, ... (all optional)");
writer.key("returns"); writer.value("date");
writer.endObject();
}
}