/*
* *************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
* *************************************************************************************
*/
package com.espertech.esper.epl.datetime.calop;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.*;
public class CalendarOpUtil {
protected static Integer getInt(ExprEvaluator expr, EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context) {
Object result = expr.evaluate(eventsPerStream, isNewData, context);
if (result == null) {
return null;
}
return (Integer) result;
}
public static CalendarFieldEnum getEnum(String methodName, ExprNode exprNode) throws ExprValidationException {
String message = "Date-time enumeration method '" + methodName + "'";
String validFieldNames = "valid field names are '" + CalendarFieldEnum.getValidList() + "'";
if (!ExprNodeUtility.isConstantValueExpr(exprNode)) {
throw new ExprValidationException(message + " requires a constant string-type parameter as its first parameter, " + validFieldNames);
}
String fieldname = (String) exprNode.getExprEvaluator().evaluate(null, true, null);
CalendarFieldEnum fieldNum = CalendarFieldEnum.fromString(fieldname);
if (fieldNum == null) {
throw new ExprValidationException(message + " datetime-field name '" + fieldname + "' is not recognized, " + validFieldNames);
}
return fieldNum;
}
}