mondrian.olap
Class ExpCacheDescriptor

java.lang.Object
  mondrian.olap.ExpCacheDescriptor

public class ExpCacheDescriptor
extends Object

Holds information necessary to add an expression to the expression result cache (see Evaluator.getCachedResult(ExpCacheDescriptor)).

Since:

Aug 16, 2005

Author:

jhyde

Constructor Summary

ExpCacheDescriptor(Exp exp, Calc calc, Evaluator evaluator)
Creates a descriptor with a given compiled expression.

ExpCacheDescriptor(Exp exp, Evaluator evaluator)
Creates a descriptor.

ExpCacheDescriptor(Exp exp, ExpCompiler compiler)
Creates a descriptor.

Method Summary

Object	evaluate(Evaluator evaluator)
Calc	getCalc()
int[]	getDependentHierarchyOrdinals() Returns the ordinals of the hierarchies which this expression is dependent upon.
Exp	getExp()

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpCacheDescriptor

public ExpCacheDescriptor(Exp exp,
                          Calc calc,
                          Evaluator evaluator)

Creates a descriptor with a given compiled expression.

Parameters:

exp - Expression

calc - Compiled expression

evaluator - Evaluator

ExpCacheDescriptor

public ExpCacheDescriptor(Exp exp,
                          Evaluator evaluator)

Creates a descriptor.

Parameters:

exp - Expression

evaluator - Evaluator

ExpCacheDescriptor

public ExpCacheDescriptor(Exp exp,
                          ExpCompiler compiler)

Creates a descriptor.

Parameters:

exp - Expression

compiler - Compiler

Method Detail

getExp

public Exp getExp()

getCalc

public Calc getCalc()

evaluate

public Object evaluate(Evaluator evaluator)

getDependentHierarchyOrdinals

public int[] getDependentHierarchyOrdinals()

Returns the ordinals of the hierarchies which this expression is dependent upon. When the cache descriptor is used to generate a cache key, the key will consist of a member from each of these hierarchies.