com.espertech.esper.epl.expression.baseagg
Class ExprAggregateNodeUtil

java.lang.Object
  com.espertech.esper.epl.expression.baseagg.ExprAggregateNodeUtil

public class ExprAggregateNodeUtil
extends java.lang.Object

Constructor Summary

ExprAggregateNodeUtil()

Method Summary

static int	countPositionalArgs(java.util.List<ExprNode> args)
static void	getAggregatesBottomUp(ExprNode[][] nodes, java.util.List<ExprAggregateNode> aggregateNodes)
static void	getAggregatesBottomUp(ExprNode[] nodes, java.util.List<ExprAggregateNode> aggregateNodes)
static void	getAggregatesBottomUp(ExprNode topNode, java.util.List<ExprAggregateNode> aggregateNodes) Populates into the supplied list all aggregation functions within this expression, if any.
static ExprAggregateNodeParamDesc	getValidatePositionalParams(ExprNode[] childNodes, boolean allowOnlyGroupBy)
static boolean	isNonPositionalParameter(ExprNode node)

Methods inherited from class java.lang.Object

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

Constructor Detail

ExprAggregateNodeUtil

public ExprAggregateNodeUtil()

Method Detail

getValidatePositionalParams

public static ExprAggregateNodeParamDesc getValidatePositionalParams(ExprNode[] childNodes,
                                                                     boolean allowOnlyGroupBy)
                                                              throws ExprValidationException

Throws:

ExprValidationException

isNonPositionalParameter

public static boolean isNonPositionalParameter(ExprNode node)

getAggregatesBottomUp

public static void getAggregatesBottomUp(ExprNode[][] nodes,
                                         java.util.List<ExprAggregateNode> aggregateNodes)

getAggregatesBottomUp

public static void getAggregatesBottomUp(ExprNode[] nodes,
                                         java.util.List<ExprAggregateNode> aggregateNodes)

getAggregatesBottomUp

public static void getAggregatesBottomUp(ExprNode topNode,
                                         java.util.List<ExprAggregateNode> aggregateNodes)

Populates into the supplied list all aggregation functions within this expression, if any.

Populates by going bottom-up such that nested aggregates appear first.

I.e. sum(volume * sum(price)) would put first A then B into the list with A=sum(price) and B=sum(volume * A)

Parameters:

topNode - is the expression node to deep inspect

aggregateNodes - is a list of node to populate into

countPositionalArgs

public static int countPositionalArgs(java.util.List<ExprNode> args)