Package com.onec.ui

Class WidgetAggregate

java.lang.Object

com.onec.ui.WidgetAggregate

public final class WidgetAggregate
extends Object

Builds the SQL aggregate expression for a count/metric card. count needs no column; sum/avg/min/max aggregate a single numeric column, which must be one of the entity's known columns (so the metric field can never carry arbitrary SQL). sum coalesces to zero so an empty table reads as 0 rather than null.

Method Summary

Modifier and Type	Method	Description
static String	expression(String metric, String field, Set<String> columns)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

expression

public static String expression(String metric,
 String field,
 Set<String> columns)

Parameters:

metric - one of count|sum|avg|min|max (null/blank → count)

field - the column to aggregate; required for everything but count

columns - the entity's valid column names

Throws:

IllegalArgumentException - if the metric is unknown, or the field is missing/unknown