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:
- Serializable, Value
class Count
- extends AggregateVal
Count non-null values.
- Author:
- Abe White
Constructor Summary |
Count(Val val)
Constructor. |
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 |
Count
public Count(Val val)
- Constructor. Provide the value to count.
getType
protected Class getType(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 Object operate(Collection os,
Class c)
- Description copied from class:
AggregateVal
- Aggregate the given values.
- Specified by:
operate
in class AggregateVal
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