org.apache.openjpa.kernel.exps

Class Count

java.lang.Object

org.apache.openjpa.kernel.exps.Val

org.apache.openjpa.kernel.exps.AggregateVal

org.apache.openjpa.kernel.exps.Count

All Implemented Interfaces:

java.io.Serializable, Value

 class Count
extends AggregateVal

Count non-null values.

Author:

Abe White

Constructor Summary

Constructors

Constructor and Description
Count(Val val) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
protected java.lang.Class	getType(java.lang.Class c) Return the type of this aggregate based on the value type.
protected java.lang.Object	operate(java.util.Collection os, java.lang.Class c) Aggregate the given values.

Methods inherited from class org.apache.openjpa.kernel.exps.AggregateVal

acceptVisit, eval, eval, getType, isAggregate, setImplicitType

Methods inherited from class org.apache.openjpa.kernel.exps.Val

evaluate, evaluate, getAlias, getMetaData, getName, getPath, getSelectAs, isVariable, isXPath, setAlias, setMetaData

Methods inherited from class java.lang.Object

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

Constructor Detail

Count

public Count(Val val)

Constructor. Provide the value to count.

Method Detail

getType

protected java.lang.Class getType(java.lang.Class c)

Description copied from class: AggregateVal

Return the type of this aggregate based on the value type.

Specified by:

getType in class AggregateVal

operate

protected java.lang.Object operate(java.util.Collection os,
                       java.lang.Class c)

Description copied from class: AggregateVal

Aggregate the given values.

Specified by:

operate in class AggregateVal