mondrian.calc.impl
Class DimensionCurrentMemberCalc

java.lang.Object
  mondrian.calc.impl.AbstractCalc
      mondrian.calc.impl.AbstractMemberCalc
          mondrian.calc.impl.DimensionCurrentMemberCalc

All Implemented Interfaces:

Calc, MemberCalc

public class DimensionCurrentMemberCalc
extends AbstractMemberCalc

Expression which returns the current member of a given dimension.

Since:

Sep 26, 2005

Author:

jhyde

Field Summary

Fields inherited from class mondrian.calc.impl.AbstractCalc

exp, type

Constructor Summary

DimensionCurrentMemberCalc(Dimension dimension)

Method Summary

boolean	dependsOn(Dimension dimension) Returns whether this expression depends upon a given dimension.
Member	evaluateMember(Evaluator evaluator) Evaluates this expression to yield a member.

Methods inherited from class mondrian.calc.impl.AbstractMemberCalc

evaluate, getCalcs

Methods inherited from class mondrian.calc.impl.AbstractCalc

accept, anyDepends, anyDependsButFirst, butDepends, getArguments, 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

DimensionCurrentMemberCalc

public DimensionCurrentMemberCalc(Dimension dimension)

Method Detail

evaluateMember

public Member evaluateMember(Evaluator evaluator)

Description copied from interface: MemberCalc

Evaluates this expression to yield a member.

May return the null member (see Hierarchy.getNullMember()) but never null.

Parameters:

evaluator - Evaluation context

Returns:

a member

dependsOn

public boolean dependsOn(Dimension dimension)

Description copied from interface: Calc

Returns whether this expression depends upon a given dimension.

If it does not depend on the dimension, 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 dimensions except [Measures] and [Time].
• The list expression

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

  depends upon all dimensions except [Store] and [Measures]. How so? Normally the scalar expression would depend upon all dimensions 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:

dimension - Dimension

Returns:

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