mondrian.calc.impl
Class AbstractTupleIterCalc

java.lang.Object
  mondrian.calc.impl.AbstractCalc
      mondrian.calc.impl.AbstractTupleIterCalc

All Implemented Interfaces:

Calc, IterCalc, TupleIterCalc

Direct Known Subclasses:

CrossJoinFunDef.BaseMemberArrayMemberArrayIterCalc, CrossJoinFunDef.BaseMemberArrayMemberIterCalc, CrossJoinFunDef.BaseMemberMemberArrayIterCalc, CrossJoinFunDef.BaseMemberMemberIterCalc, SetFunDef.ExprTupleIterCalc

public abstract class AbstractTupleIterCalc
extends AbstractCalc
implements TupleIterCalc

Abstract implementation of the ListCalc interface for expressions that return a list of members but never a list of tuples.

The derived class must implement the TupleIterCalc.evaluateTupleIterable(mondrian.olap.Evaluator) method, and the evaluate(mondrian.olap.Evaluator) method will call it.

Since:

Oct 24, 2008

Version:

$Id: //open/mondrian/src/main/mondrian/calc/impl/AbstractTupleIterCalc.java#3 $

Author:

jhyde

See Also:

AbstractListCalc

Field Summary

Fields inherited from class mondrian.calc.impl.AbstractCalc

exp, type

Constructor Summary

protected

AbstractTupleIterCalc(Exp exp, Calc[] calcs) Creates an abstract implementation of a compiled expression which returns a list.

Method Summary

java.lang.Object	evaluate(Evaluator evaluator) Evaluates this expression.
java.lang.Iterable<Member[]>	evaluateIterable(Evaluator evaluator) Evaluates an expression to yield an Iterable of members or tuples.
ResultStyle	getResultStyle() Returns style in which the result of evaluating this expression is returned.
SetType	getType() Returns the type of this expression.
java.lang.String	toString()

Methods inherited from class mondrian.calc.impl.AbstractCalc

accept, anyDepends, anyDependsButFirst, butDepends, dependsOn, getArguments, getCalcs, getName, simplifyEvaluator

Methods inherited from class java.lang.Object

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

Methods inherited from interface mondrian.calc.TupleIterCalc

evaluateTupleIterable

Methods inherited from interface mondrian.calc.Calc

accept, dependsOn

Constructor Detail

AbstractTupleIterCalc

protected AbstractTupleIterCalc(Exp exp,
                                Calc[] calcs)

Creates an abstract implementation of a compiled expression which returns a list.

Parameters:

exp - Expression which was compiled

calcs - List of child compiled expressions (for dependency analysis)

Method Detail

getType

public SetType getType()

Description copied from interface: Calc

Returns the type of this expression.

Specified by:

getType in interface Calc

Specified by:

getType in interface TupleIterCalc

Overrides:

getType in class AbstractCalc

evaluate

public final java.lang.Object evaluate(Evaluator evaluator)

Description copied from interface: Calc

Evaluates this expression.

Specified by:

evaluate in interface Calc

Parameters:

evaluator - Provides dimensional context in which to evaluate this expression

Returns:

Result of expression evaluation

getResultStyle

public ResultStyle getResultStyle()

Description copied from interface: Calc

Returns style in which the result of evaluating this expression is returned.

One application of this method is for the compiler to figure out whether the compiled expression is returning a mutable list. If a mutable list is required, the compiler can create a mutable copy.

Specified by:

getResultStyle in interface Calc

Overrides:

getResultStyle in class AbstractCalc

See Also:

ExpCompiler.compileList(mondrian.olap.Exp, boolean)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

evaluateIterable

public final java.lang.Iterable<Member[]> evaluateIterable(Evaluator evaluator)

Description copied from interface: IterCalc

Evaluates an expression to yield an Iterable of members or tuples.

The Iterable is immutable.

Specified by:

evaluateIterable in interface IterCalc

Parameters:

evaluator - Evaluation context

Returns:

An Iterable of members or tuples, never null.