mondrian.calc.impl
Class ValueCalc

java.lang.Object
  mondrian.calc.impl.AbstractCalc
      mondrian.calc.impl.GenericCalc
          mondrian.calc.impl.ValueCalc

All Implemented Interfaces:

BooleanCalc, Calc, DateTimeCalc, DimensionCalc, DoubleCalc, HierarchyCalc, IntegerCalc, LevelCalc, MemberCalc, StringCalc, TupleCalc, VoidCalc

public class ValueCalc
extends GenericCalc

Expression which yields the value of the current member in the current dimensional context.

Since:

Sep 27, 2005

Version:

$Id: //open/mondrian/src/main/mondrian/calc/impl/ValueCalc.java#5 $

Author:

jhyde

See Also:

MemberValueCalc

Field Summary

Fields inherited from class mondrian.calc.impl.AbstractCalc

exp, type

Constructor Summary

ValueCalc(Exp exp)
Creates a ValueCalc.

Method Summary

boolean	dependsOn(Hierarchy hierarchy) Returns whether this expression depends upon a given hierarchy.
java.lang.Object	evaluate(Evaluator evaluator) Evaluates this expression.

Methods inherited from class mondrian.calc.impl.GenericCalc

evaluateBoolean, evaluateDateTime, evaluateDimension, evaluateDouble, evaluateHierarchy, evaluateInteger, evaluateLevel, evaluateMember, evaluateString, evaluateTuple, evaluateVoid, numberToDouble

Methods inherited from class mondrian.calc.impl.AbstractCalc

accept, anyDepends, anyDependsButFirst, butDepends, getArguments, getCalcs, getName, getResultStyle, getType, simplifyEvaluator

Methods inherited from class java.lang.Object

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

Methods inherited from interface mondrian.calc.Calc

accept, getResultStyle, getType

Constructor Detail

ValueCalc

public ValueCalc(Exp exp)

Creates a ValueCalc.

Parameters:

exp - Source expression

Method Detail

evaluate

public java.lang.Object evaluate(Evaluator evaluator)

Description copied from interface: Calc

Evaluates this expression.

Parameters:

evaluator - Provides dimensional context in which to evaluate this expression

Returns:

Result of expression evaluation

dependsOn

public boolean dependsOn(Hierarchy hierarchy)

Description copied from interface: Calc

Returns whether this expression depends upon a given hierarchy.

If it does not depend on the hierarchy, then re-evaluating the expression with a different member of this context must produce the same answer.

Some examples:

• The expression

  [Measures].[Unit Sales]

  depends on all dimensions except [Measures].
• The boolean expression

  ([Measures].[Unit Sales], [Time].[1997]) > 1000

  depends on all hierarchies except [Measures] and [Time].
• The list expression

  Filter([Store].[USA].Children, [Measures].[Unit Sales] < 50)

  depends upon all hierarchies except [Store] and [Measures]. How so? Normally the scalar expression would depend upon all hierarchies except [Measures], but the Filter function sets the [Store] context before evaluating the scalar expression, so it is not inherited from the surrounding context.

Specified by:

dependsOn in interface Calc

Overrides:

dependsOn in class AbstractCalc

Parameters:

hierarchy - Hierarchy

Returns:

Whether this expression's result depends upon the current member of the hierarchy