org.objectweb.medor.filter.lib
Class Avg

java.lang.Object
  BasicUnaryOperator
      org.objectweb.medor.filter.lib.BasicAggregateOperator
          org.objectweb.medor.filter.lib.Avg

All Implemented Interfaces:

AggregateOperator

public class Avg

extends BasicAggregateOperator

Avg aggregate function.

Avg applies to :

1. a FieldOperand, which is part of a NestedField.
2. a Collection of values (TupleCollection), specifying which Field is to be aggregated
3. a Collection of values (Java Collection)

Author:

Alexandre Lefebvre

See Also:

Serialized Form

Field Summary

Fields inherited from class org.objectweb.medor.filter.lib.BasicAggregateOperator

distinct

Constructor Summary

Avg()

Avg(Expression e)

Avg(Expression e, boolean distinct)

Method Summary

Operand	compileExpression()
Operand	evaluate(ParameterOperand[] pos, java.lang.Object o)
java.lang.String	getOperatorString()

Methods inherited from class org.objectweb.medor.filter.lib.BasicAggregateOperator

clone, getDistinct, setDistinct

Methods inherited from class java.lang.Object

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

Constructor Detail

Avg

public Avg()

Avg

public Avg(Expression e)

Avg

public Avg(Expression e,
           boolean distinct)

Method Detail

getOperatorString

public java.lang.String getOperatorString()

compileExpression

public Operand compileExpression()
                          throws ExpressionException,
                                 MalformedExpressionException

Throws:

ExpressionException

MalformedExpressionException

evaluate

public Operand evaluate(ParameterOperand[] pos,
                        java.lang.Object o)
                 throws ExpressionException

Throws:

ExpressionException