package er.grouping;
import org.apache.log4j.Logger;
import com.webobjects.foundation.NSKeyValueCoding;
import com.webobjects.foundation.NSTimestamp;
/**
* Converts values. The main reason for this class is to provide a
* point where you can patch into the internals of the grouping framework
* without needing to override many classes.
* You'd set an instance of your subclass if you want to deal with
* simple Timestamps, Dates or the like.
*/
public class DRValueConverter {
/** Logging support */
protected static final Logger log = Logger.getLogger(DRValueConverter.class);
public NSTimestamp timestampForValue(Object v) {
if(v instanceof NSTimestamp) {
return (NSTimestamp)v;
}
return null;
}
public double doubleForValue(Object v) {
double scr = 0.0;
if(v == null) {
return 0.0;
} else if (v instanceof String) {
try {
scr = Double.parseDouble((String)v);
} catch(NumberFormatException e) {
log.error("Not a number: " + v);
scr = 0.0;
}
} else if(v instanceof Number){
Number vv = (Number)v;
scr = vv.doubleValue();
} else if (v instanceof NSTimestamp) {
NSTimestamp vv = (NSTimestamp)v;
scr = vv.getTime() / 1000.0;
} else if(v == NSKeyValueCoding.NullValue) {
scr = 0.0;
} else {
try {
scr = Double.parseDouble(v.toString());
} catch(NumberFormatException ex) {
log.error("Not a number: " + v);
scr = 0.0;
}
}
return scr;
}
public Number numberForValue(Object v) {
double vv = doubleForValue(v);
Number scr = Double.valueOf(vv);
return scr;
}
private static DRValueConverter _converter = new DRValueConverter();
public static DRValueConverter converter() {
return _converter;
}
public static void setConverter(DRValueConverter value) {
_converter = value;
}
}