package org.araqne.logdb.query.expr; import java.util.List; import org.araqne.logdb.QueryContext; import org.araqne.logdb.Row; public class Atan extends FunctionExpression { private Expression valueExpr; public Atan(QueryContext ctx, List<Expression> exprs) { super("atan", exprs, 1); this.valueExpr = exprs.get(0); } @Override public Object eval(Row row) { Object value = valueExpr.eval(row); if (value == null) return null; if (value instanceof Number) return Math.atan(((Number) value).doubleValue()); else return null; } }