Package org.datanucleus.store.query.inmemory

Class SetExpression

java.lang.Object

org.datanucleus.store.query.inmemory.SetExpression

public class SetExpression
extends java.lang.Object

Expression for the aggregation of a set of object values. Provides basic aggregation methods "count", "min", "max", "avg", "sum" and makes use of the AggregateExpression sub-types for Java type handling.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) java.lang.String	alias
(package private) java.util.Iterator	itemIterator

Constructor Summary

Constructors

Constructor	Description
SetExpression(java.util.Collection items, java.lang.String alias)	Constructor for a SetExpression to perform the aggregation.

Method Summary

Modifier and Type	Method	Description
java.lang.Object	avg(Expression paramExpr, ExpressionEvaluator eval, java.util.Map<java.lang.String,java.lang.Object> state)
java.lang.Object	count(Expression expr, ExpressionEvaluator eval)
java.lang.Object	max(Expression paramExpr, ExpressionEvaluator eval, java.util.Map<java.lang.String,java.lang.Object> state)
java.lang.Object	min(Expression paramExpr, ExpressionEvaluator eval, java.util.Map<java.lang.String,java.lang.Object> state)
java.lang.Object	sum(Expression paramExpr, ExpressionEvaluator eval, java.util.Map<java.lang.String,java.lang.Object> state)

Methods inherited from class java.lang.Object

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

Field Detail

alias

java.lang.String alias

itemIterator

java.util.Iterator itemIterator

Constructor Detail

SetExpression

public SetExpression(java.util.Collection items,
                     java.lang.String alias)

Constructor for a SetExpression to perform the aggregation.

Parameters:

items - The items to aggregate

alias - The alias for these items

Method Detail

count

public java.lang.Object count(Expression expr,
                              ExpressionEvaluator eval)

min

public java.lang.Object min(Expression paramExpr,
                            ExpressionEvaluator eval,
                            java.util.Map<java.lang.String,java.lang.Object> state)

max

public java.lang.Object max(Expression paramExpr,
                            ExpressionEvaluator eval,
                            java.util.Map<java.lang.String,java.lang.Object> state)

sum

public java.lang.Object sum(Expression paramExpr,
                            ExpressionEvaluator eval,
                            java.util.Map<java.lang.String,java.lang.Object> state)

avg

public java.lang.Object avg(Expression paramExpr,
                            ExpressionEvaluator eval,
                            java.util.Map<java.lang.String,java.lang.Object> state)