mondrian.rolap.agg
Class AbstractQuerySpec

java.lang.Object
  mondrian.rolap.agg.AbstractQuerySpec

All Implemented Interfaces:

QuerySpec

Direct Known Subclasses:

DrillThroughQuerySpec, SegmentArrayQuerySpec

public abstract class AbstractQuerySpec
extends Object
implements QuerySpec

Base class for QuerySpec implementations.

Author:

jhyde, Richard M. Emberson

Field Summary

protected boolean

countOnly

Constructor Summary

protected

AbstractQuerySpec(RolapStar star, boolean countOnly) Creates an AbstractQuerySpec.

Method Summary

protected void	addGroupingFunction(SqlQuery sqlQuery)
protected void	addGroupingSets(SqlQuery sqlQuery)
protected void	addMeasure(int i, SqlQuery sqlQuery) Adds a measure to a query.
protected void	distinctGenerateSql(SqlQuery outerSqlQuery, boolean countOnly) Generates a SQL query to retrieve the values in this segment using an algorithm which converts distinct-aggregates to non-distinct aggregates over subqueries.
protected void	extraPredicates(SqlQuery sqlQuery) Adds predicates not associated with columns.
String	generateSqlQuery()
protected int	getDistinctMeasureCount() Returns the number of measures whose aggregation function is distinct-count.
protected List<StarPredicate>	getPredicateList() Returns a list of predicates not associated with a particular column.
RolapStar	getStar()
protected abstract boolean	isAggregate()
protected boolean	isOrdered() Whether to add an ORDER BY clause to make results deterministic.
protected SqlQuery	newSqlQuery() Creates a query object.
protected void	nonDistinctGenerateSql(SqlQuery sqlQuery)

Methods inherited from class java.lang.Object

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

Methods inherited from interface mondrian.rolap.agg.QuerySpec

getColumnAlias, getColumnPredicate, getColumns, getMeasure, getMeasureAlias, getMeasureCount

Field Detail

countOnly

protected final boolean countOnly

Constructor Detail

AbstractQuerySpec

protected AbstractQuerySpec(RolapStar star,
                            boolean countOnly)

Creates an AbstractQuerySpec.

Parameters:

star - Star which defines columns of interest and their relationships

countOnly - If true, generate no GROUP BY clause, so the query returns a single row containing a grand total

Method Detail

newSqlQuery

protected SqlQuery newSqlQuery()

Creates a query object.

Returns:

a new query object

getStar

public RolapStar getStar()

Specified by:

getStar in interface QuerySpec

addMeasure

protected void addMeasure(int i,
                          SqlQuery sqlQuery)

Adds a measure to a query.

Parameters:

i - Ordinal of measure

sqlQuery - Query object

isAggregate

protected abstract boolean isAggregate()

nonDistinctGenerateSql

protected void nonDistinctGenerateSql(SqlQuery sqlQuery)

isOrdered

protected boolean isOrdered()

Whether to add an ORDER BY clause to make results deterministic. Necessary if query returns more than one row and results are for human consumption.

Returns:

whether to sort query

generateSqlQuery

public String generateSqlQuery()

Specified by:

generateSqlQuery in interface QuerySpec

addGroupingFunction

protected void addGroupingFunction(SqlQuery sqlQuery)

addGroupingSets

protected void addGroupingSets(SqlQuery sqlQuery)

getDistinctMeasureCount

protected int getDistinctMeasureCount()

Returns the number of measures whose aggregation function is distinct-count.

Returns:

Number of distinct-count measures

distinctGenerateSql

protected void distinctGenerateSql(SqlQuery outerSqlQuery,
                                   boolean countOnly)

Generates a SQL query to retrieve the values in this segment using an algorithm which converts distinct-aggregates to non-distinct aggregates over subqueries.

Parameters:

outerSqlQuery - Query to modify

countOnly - If true, only generate a single row: no need to generate a GROUP BY clause or put any constraining columns in the SELECT clause

extraPredicates

protected void extraPredicates(SqlQuery sqlQuery)

Adds predicates not associated with columns.

Parameters:

sqlQuery - Query

getPredicateList

protected List<StarPredicate> getPredicateList()

Returns a list of predicates not associated with a particular column.

Returns:

list of non-column predicates