mondrian.calc.impl
Class AbstractIterCalc

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

All Implemented Interfaces:

Calc, IterCalc

Direct Known Subclasses:

CrossJoinFunDef.CrossJoinIterCalc, SetFunDef.ExprIterCalc

public abstract class AbstractIterCalc
extends AbstractCalc
implements IterCalc

Abstract implementation of the IterCalc interface.

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

Since:

Oct 24, 2008

Author:

jhyde

See Also:

AbstractListCalc

Field Summary

Fields inherited from class mondrian.calc.impl.AbstractCalc

exp, type

Constructor Summary

protected

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

Method Summary

Object	evaluate(Evaluator evaluator) Evaluates this expression.
ResultStyle	getResultStyle() Returns style in which the result of evaluating this expression is returned.
SetType	getType() Returns the type of this expression.
String	toString()

Methods inherited from class mondrian.calc.impl.AbstractCalc

accept, anyDepends, anyDependsButFirst, butDepends, collectArguments, dependsOn, getArguments, getCalcs, getName, isWrapperFor, simplifyEvaluator, unwrap

Methods inherited from class java.lang.Object

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

Methods inherited from interface mondrian.calc.IterCalc

evaluateIterable

Methods inherited from interface mondrian.calc.Calc

accept, dependsOn, isWrapperFor, unwrap

Constructor Detail

AbstractIterCalc

protected AbstractIterCalc(Exp exp,
                           Calc[] calcs)

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

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

Overrides:

getType in class AbstractCalc

evaluate

public final 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 String toString()

Overrides:

toString in class Object