org.pentaho.aggdes.model.mondrian

Class MondrianSchemaLoader

java.lang.Object

org.pentaho.aggdes.model.mondrian.MondrianSchemaLoader

All Implemented Interfaces:

Component, SchemaLoader

public class MondrianSchemaLoader
extends Object
implements SchemaLoader

Loads the schema needed to drive the aggregate designer algorithm from a mondrian schema file.

The implementation loads a star cube from a mondrian cube.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MondrianSchemaLoader.MondrianSchemaLoaderParameter Enumeration of parameters accepted by MondrianSchemaLoader.

Constructor Summary

Constructors

Constructor and Description
MondrianSchemaLoader()

Method Summary

Methods

Modifier and Type	Method and Description
Schema	createSchema(Map<Parameter,Object> parameterValues)
static double	estimateAggregateCount(double[] cardinalities, double factCount) Estimates the number of rows in an aggregate table, given the cardinalities of its columns (assumed independent) and the number of rows in the fact table.
static double	estimateAggregateCount(double comboCount, double factCount) Estimates the number of rows in an aggregate table, given the product of the cardinalities of its columns (assumed independent) and the number of rows in the fact table.
String	getName()
List<Parameter>	getParameters()
protected List<MondrianSchemaValidator>	loadValidators(Map<Parameter,Object> parameterValues)
List<ValidationMessage>	validateSchema(Map<Parameter,Object> parameterValues)

Methods inherited from class java.lang.Object

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

Constructor Detail

MondrianSchemaLoader

public MondrianSchemaLoader()

Method Detail

createSchema

public Schema createSchema(Map<Parameter,Object> parameterValues)

Specified by:

createSchema in interface SchemaLoader

validateSchema

public List<ValidationMessage> validateSchema(Map<Parameter,Object> parameterValues)

Specified by:

validateSchema in interface SchemaLoader

loadValidators

protected List<MondrianSchemaValidator> loadValidators(Map<Parameter,Object> parameterValues)
                                                throws ClassNotFoundException,
                                                       InstantiationException,
                                                       IllegalAccessException

Throws:

ClassNotFoundException

InstantiationException

IllegalAccessException

getParameters

public List<Parameter> getParameters()

Specified by:

getParameters in interface Component

getName

public String getName()

Specified by:

getName in interface Component

estimateAggregateCount

public static double estimateAggregateCount(double[] cardinalities,
                            double factCount)

Estimates the number of rows in an aggregate table, given the cardinalities of its columns (assumed independent) and the number of rows in the fact table.

Parameters:

cardinalities - Array of column cardinalities

factCount - Number of rows in fact table

Returns:

Estimated number of rows in aggregate table

estimateAggregateCount

public static double estimateAggregateCount(double comboCount,
                            double factCount)

Estimates the number of rows in an aggregate table, given the product of the cardinalities of its columns (assumed independent) and the number of rows in the fact table.

Parameters:

comboCount - Product of column cardinalities

factCount - Number of rows in fact table

Returns:

Estimated number of rows in aggregate table