mondrian.calc.impl
Class MemberValueCalc
java.lang.Object
mondrian.calc.impl.AbstractCalc
mondrian.calc.impl.GenericCalc
mondrian.calc.impl.MemberValueCalc
- All Implemented Interfaces:
- BooleanCalc, Calc, DateTimeCalc, DimensionCalc, DoubleCalc, HierarchyCalc, IntegerCalc, LevelCalc, MemberCalc, StringCalc, TupleCalc, VoidCalc
public class MemberValueCalc
- extends GenericCalc
Expression which evaluates a few member expressions,
sets the dimensional context to the result of those expressions,
then yields the value of the current measure in the current
dimensional context.
The evaluator's context is preserved.
Note that a MemberValueCalc with 0 member expressions is equivalent to a
ValueCalc
; see also TupleValueCalc
.
- Since:
- Sep 27, 2005
- Version:
- $Id: //open/mondrian/src/main/mondrian/calc/impl/MemberValueCalc.java#11 $
- Author:
- jhyde
Method Summary |
boolean |
dependsOn(Hierarchy hierarchy)
Returns whether this expression depends upon a given hierarchy. |
java.lang.Object |
evaluate(Evaluator evaluator)
Evaluates this expression. |
Calc[] |
getCalcs()
Returns this expression's child expressions. |
Methods inherited from class mondrian.calc.impl.GenericCalc |
evaluateBoolean, evaluateDateTime, evaluateDimension, evaluateDouble, evaluateHierarchy, evaluateInteger, evaluateLevel, evaluateMember, evaluateString, evaluateTuple, evaluateVoid, numberToDouble |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
MemberValueCalc
public MemberValueCalc(Exp exp,
MemberCalc[] memberCalcs)
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
getCalcs
public Calc[] getCalcs()
- Description copied from class:
AbstractCalc
- Returns this expression's child expressions.
- Overrides:
getCalcs
in class AbstractCalc
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