mondrian.rolap

Class RolapNativeSet

java.lang.Object

mondrian.rolap.RolapNative

mondrian.rolap.RolapNativeSet

Direct Known Subclasses:

RolapNativeCrossJoin, RolapNativeFilter, RolapNativeTopCount

public abstract class RolapNativeSet
extends RolapNative

Analyses set expressions and executes them in SQL if possible. Supports crossjoin, member.children, level.members and member.descendants - all in non empty mode, i.e. there is a join to the fact table.

TODO: the order of the result is different from the order of the enumeration. Should sort.

Since:

Nov 12, 2005

Author:

av

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	RolapNativeSet.SchemaReaderWithMemberReaderAvailable
protected static class	RolapNativeSet.SetConstraint Constraint for non empty {crossjoin, member.children, member.descendants, level.members}
protected class	RolapNativeSet.SetEvaluator

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.apache.log4j.Logger	LOGGER

Fields inherited from class mondrian.rolap.RolapNative

listener

Constructor Summary

Constructors

Constructor and Description
RolapNativeSet()

Method Summary

Modifier and Type	Method and Description
protected CrossJoinArgFactory	crossJoinArgFactory()
void	flushCache()
protected boolean	isPreferInterpreter(CrossJoinArg[] args, boolean joinArg) Tests whether non-native evaluation is preferred for the given arguments.
protected void	overrideContext(RolapEvaluator evaluator, CrossJoinArg[] cargs, RolapStoredMeasure storedMeasure) Overrides current members in position by default members in hierarchies which are involved in this filter/topcount.
protected abstract boolean	restrictMemberTypes() Returns whether certain member types (e.g.

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

protected static final org.apache.log4j.Logger LOGGER

Constructor Detail

RolapNativeSet

public RolapNativeSet()

Method Detail

restrictMemberTypes

protected abstract boolean restrictMemberTypes()

Returns whether certain member types (e.g. calculated members) should disable native SQL evaluation for expressions containing them.

If true, expressions containing calculated members will be evaluated by the interpreter, instead of using SQL.

If false, calc members will be ignored and the computation will be done in SQL, returning more members than requested. This is ok, if the superflous members are filtered out in java code afterwards.

Returns:

whether certain member types should disable native SQL evaluation

crossJoinArgFactory

protected CrossJoinArgFactory crossJoinArgFactory()

isPreferInterpreter

protected boolean isPreferInterpreter(CrossJoinArg[] args,
                                      boolean joinArg)

Tests whether non-native evaluation is preferred for the given arguments.

Parameters:

joinArg - true if evaluating a cross-join; false if evaluating a single-input expression such as filter

Returns:

true if all args prefer the interpreter

overrideContext

protected void overrideContext(RolapEvaluator evaluator,
                               CrossJoinArg[] cargs,
                               RolapStoredMeasure storedMeasure)

Overrides current members in position by default members in hierarchies which are involved in this filter/topcount. Stores the RolapStoredMeasure into the context because that is needed to generate a cell request to constraint the sql.

The current context may contain a calculated measure, this measure was translated into an sql condition (filter/topcount). The measure is not used to constrain the result but only to access the star.

Parameters:

evaluator - Evaluation context to modify

cargs - Cross join arguments

storedMeasure - Stored measure

See Also:

RolapAggregationManager.makeRequest(RolapEvaluator)

flushCache

public void flushCache()