Package mondrian.rolap

Implements the data access layer for the olap package.

See: Description

Interface Summary

Interface	Description
BitKey	Represents a set of bits.
CellKey	A CellKey is used as a key in maps which access cells by their position.
MemberSource	A MemberSource has the basic operations to read the members of a hierarchy.
Modulos	Modulos implementations encapsulate algorithms to map between integral ordinals and position arrays.
RolapAggregationManager.PinSet	A set of segments which are pinned (prevented from garbage collection) for a short duration as a result of a cache inquiry.
RolapCubeHierarchy.RolapCubeHierarchyMemberReader	TODO: Since this is part of a caching strategy, should be implemented as a Strategy Pattern, avoiding hierarchy.
RolapMeasure	Interface implemented by all measures (both stored and calculated).
RolapMember	A RolapMember is a member of a RolapHierarchy.
RolapMemberBase.PropertyValueMapFactory	Interface definition for the pluggable factory used to decide which implementation of Map to use to store property string/value pairs for member properties.
RolapMemberInCube	Extension to RolapMember that knows the current cube.
RolapNativeSet.SchemaReaderWithMemberReaderAvailable
RolapStoredMeasure	A measure which is implemented by a SQL column or SQL expression (as opposed to a RolapCalculatedMember.
RolapUtil.ExecuteQueryHook
SqlStatement.Accessor
StarColumnPredicate	Refinement of StarPredicate which constrains precisely one column.
StarPredicate	Condition which constrains a set of values of a single RolapStar.Column or a set of columns.
TupleReader	Describes the public methods of SqlTupleReader.
TupleReader.MemberBuilder	Factory to create new members for a hierarchy from SQL result.

Class Summary

Class	Description
BitKey.AbstractBitKey	Abstract implementation of BitKey.
BitKey.Big	Implementation of BitKey with more than 64 bits.
BitKey.Factory
BitKey.Mid128	Implementation of BitKey good for sizes less than 128.
BitKey.Small	Implementation of BitKey for bit counts less than 64.
CacheControlImpl	Implementation of CacheControl API.
CacheControlImpl.MemberSetVisitorImpl	Default implementation of MemberSetVisitor.
CellKey.Four
CellKey.Generator
CellKey.Many
CellKey.One
CellKey.Three
CellKey.Two
CellKey.Zero
CompoundPredicateInfo	Constructs a Pair based on an tuple list and measure, along with the string representation of the predicate.
DefaultMemberChildrenConstraint	Restricts the SQL result set to the parent member of a MemberChildren query.
DefaultTupleConstraint	TupleConstraint which does not restrict the result.
DelegatingRolapMember	Implementation of RolapMember that delegates all calls to an underlying member.
FastBatchingCellReader	A FastBatchingCellReader doesn't really Read cells: when asked to look up the values of stored measures, it lies, and records the fact that the value was asked for.
GroupingSetsCollector	The GroupingSetsCollector collects the GroupinpSets and pass the consolidated list to form group by grouping sets sql
HierarchyUsage	A HierarchyUsage is the usage of a hierarchy in the context of a cube.
HighCardSqlTupleReader	Deprecated Deprecated for Mondrian 4.0.
MemberCacheHelper	Encapsulation of member caching.
MemberNoCacheHelper	Encapsulation of member caching for no caching.
Modulos.Base
Modulos.Generator
Modulos.Many
Modulos.One
Modulos.Three
Modulos.Two
Modulos.Zero
NoCacheMemberReader	NoCacheMemberReader implements MemberReader but without doing any kind of caching and avoiding to read all members.
ResultLoader	Loader to be iterated to load all results from database.
RolapAggregationManager	RolapAggregationManager manages all Segments in the system.
RolapAggregator	Describes an aggregation operator, such as "sum" or "count".
RolapAggregator.AvgFromAvg	Aggregator used for aggregate tables implementing the average aggregator.
RolapAggregator.AvgFromSum	Aggregator used for aggregate tables implementing the average aggregator.
RolapAggregator.BaseAggor	This is the base class for implementing aggregators over sum and average columns in an aggregate table.
RolapAggregator.SumFromAvg	This is an aggregator used for aggregate tables implementing the sum aggregator.
RolapAxis	Implementation of the Axis interface.
RolapBaseCubeMeasure	Measure which is computed from a SQL column (or expression) and which is defined in a non-virtual cube.
RolapCacheRegion	A RolapCacheRegion represents a region of multidimensional space in the cache.
RolapCalculatedMember	A RolapCalculatedMember is a member based upon a Formula.
RolapCell	RolapCell implements Cell within a RolapResult.
RolapConnection	A RolapConnection is a connection to a Mondrian OLAP Server.
RolapCube	RolapCube implements Cube for a ROLAP database.
RolapCube.CubeComparator
RolapCubeDimension	RolapCubeDimension wraps a RolapDimension for a specific Cube.
RolapCubeHierarchy	Hierarchy that is associated with a specific Cube.
RolapCubeHierarchy.RolapCubeSqlMemberSource
RolapCubeLevel	RolapCubeLevel wraps a RolapLevel for a specific Cube.
RolapCubeMember	RolapCubeMember wraps RolapMembers and binds them to a specific cube.
RolapCubeUsages	Provides the base cubes that a virtual cube uses and specifies if unrelated dimensions to measures from these cubes should be ignored.
RolapDependencyTestingEvaluator	Evaluator which checks dependencies of expressions.
RolapEvaluator	RolapEvaluator evaluates expressions in a dimensional environment.
RolapHierarchy	RolapHierarchy implements Hierarchy for a ROLAP database.
RolapHierarchy.LimitedRollupMember	Substitute for a member in a hierarchy whose rollup policy is 'partial' or 'hidden'.
RolapLevel	RolapLevel implements Level for a ROLAP database.
RolapMemberBase	Basic implementation of a member in a RolapHierarchy.
RolapMemberBase.DefaultPropertyValueMapFactory	Default RolapMemberBase.PropertyValueMapFactory implementation, used if MondrianProperties.PropertyValueMapFactoryClass is not set.
RolapMemberBase.PropertyValueMapFactoryFactory	Creates the PropertyValueMapFactory which is in turn used to create property-value maps for member properties.
RolapNative	A factory for NativeEvaluator.
RolapNativeCrossJoin	Creates a NativeEvaluator that evaluates NON EMPTY CrossJoin in SQL.
RolapNativeFilter	Computes a Filter(set, condition) in SQL.
RolapNativeRegistry	Composite of RolapNatives.
RolapNativeSet	Analyses set expressions and executes them in SQL if possible.
RolapNativeSet.SetConstraint	Constraint for non empty {crossjoin, member.children, member.descendants, level.members}
RolapNativeSql	Creates SQL from parse tree nodes.
RolapNativeTopCount	Computes a TopCount in SQL.
RolapProfilingEvaluator	Evaluator that collects profiling information as it evaluates expressions.
RolapResult	A RolapResult is the result of running a query.
RolapResult.RolapResultEvaluatorRoot	Extension to RolapEvaluatorRoot which is capable of evaluating sets and named sets.
RolapResultShepherd	A utility class for RolapConnection.
RolapSchema	A RolapSchema is a collection of RolapCubes and shared RolapDimensions.
RolapSchemaParameter	Parameter that is defined in a schema.
RolapSchemaReader	A RolapSchemaReader allows you to read schema objects while observing the access-control profile specified by a given role.
RolapStar	A RolapStar is a star schema.
RolapStar.AliasReplacer	Creates a copy of an expression, everywhere replacing one alias with another.
RolapStar.Bar	Temporary.
RolapStar.Column	A column in a star schema.
RolapStar.ColumnComparator	Comparator to compare columns based on their name and table that contains them
RolapStar.Condition
RolapStar.Measure	Definition of a measure in a star schema.
RolapStar.Table	Definition of a table in a star schema.
RolapStatisticsCache	Provides and caches statistics.
RolapUtil	Utility methods for classes in the mondrian.rolap package.
RolapUtil.TeeWriter	Writes to a string and also to an underlying writer.
RolapVirtualCubeMeasure	Measure which is defined in a virtual cube, and based on a stored measure in one of the virtual cube's base cubes.
ScenarioImpl	Implementation of Scenario.
SchemaKey	Key for an instance of a schema.
SmartIncrementalCache<K,V extends Collection>	Uses a SmartCache to store a collection of values.
SmartMemberListCache<K,V>	Uses a SmartCache to store lists of members, where the key depends on a SqlConstraint.
SmartMemberReader	SmartMemberReader implements MemberReader by keeping a cache of members and their children.
SqlConstraintFactory	Creates the right constraint for common tasks.
SqlConstraintUtils	Utility class used by implementations of SqlConstraint, used to generate constraints into SqlQuery.
SqlContextConstraint	limits the result of a Member SQL query to the current evaluation context.
SqlStatement	SqlStatement contains a SQL statement and associated resources throughout its lifetime.
SqlStatement.MyDelegatingInvocationHandler	Reflectively implements the ResultSet interface by routing method calls to the result set inside a SqlStatement.
SqlStatement.StatementLocus
SqlTupleReader	Reads the members of a single level (level.members) or of multiple levels (crossjoin).
StarColumnPredicate.Overlap	Returned by StarColumnPredicate.intersect(mondrian.rolap.StarColumnPredicate), describes whether two predicates overlap, and if so, the remaining predicate.
SubstitutingMemberReader	Implementation of MemberReader which replaces given members with a substitute.
Target	Deprecated Deprecated for Mondrian 4.0.
TargetBase	Base helper class for the SQL tuple readers HighCardSqlTupleReader and SqlTupleReader.
Test	todo:
TupleConstraintStruct

Enum Summary

Enum	Description
RolapConnectionProperties	RolapConnectionProperties enumerates the allowable values of keywords in a Mondrian connect string.
RolapLevel.HideMemberCondition	Conditions under which a level's members may be hidden (thereby creating a ragged hierarchy).
SqlStatement.Type	The approximate JDBC type of a column.

Package mondrian.rolap Description

Implements the data access layer for the olap package.

MemberReader

When a member expression like member.children is evaluated, the function requests the SchemaReader from the Evaluator. The RolapEvaluator uses the RolapSchemaReader which delegates most calls to one of its MemberReaders (one per dimension). In most cases, a SmartMemberReader will be used, which returns the requested members immediately.

CellReader

Cells are evaluated multiple times. For the first time, a FastBatchingCellReader is used. When a cell is evaluated, Evaluator.evaluateCurrent() is called. The FastBatchingCellReader will not compute the cells value but record a CellRequest for that cell and return (not throw) an exception. After all CellRequests for all cells have been recorded, the Aggregation will generate SQL to load all cells with a single SQL query. After that the cells are evaluated again with an AggregatingCellReader that will return the cell values from the cache.