Package mondrian.rolap

Class RolapStar.Column

java.lang.Object

mondrian.rolap.RolapStar.Column

Direct Known Subclasses:

RolapStar.Measure

Enclosing class:

RolapStar

public static class RolapStar.Column
extends Object

A column in a star schema.

Field Summary

Fields

Modifier and Type	Field	Description
static Comparator<RolapStar.Column>	COMPARATOR

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Column(Dialect.Datatype datatype)	Fake column.

Method Summary

Modifier and Type	Method	Description
static String	createInExpr(String expr, StarColumnPredicate predicate, Dialect.Datatype datatype, SqlQuery sqlQuery)	Generates a predicate that a column matches one of a list of values.
boolean	equals(Object obj)
String	generateExprString(SqlQuery query)	Generates a SQL expression, which typically this looks like this: tableName.columnName.
int	getBitPosition()
long	getCardinality()	Get column cardinality from the schema cache if possible; otherwise issue a select count(distinct) query to retrieve the cardinality and stores it in the cache.
Dialect.Datatype	getDatatype()
String	getDatatypeString(Dialect dialect)	Returns a string representation of the datatype of this column, in the dialect specified.
MondrianDef.Expression	getExpression()
SqlStatement.Type	getInternalType()
String	getName()
RolapStar.Column	getNameColumn()
RolapStar.Column	getParentColumn()
SqlQuery	getSqlQuery()
RolapStar	getStar()
RolapStar.Table	getTable()
String	getUsagePrefix()
int	hashCode()
boolean	isNameColumn()
void	print(PrintWriter pw, String prefix)	Prints this column.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

COMPARATOR

public static final Comparator<RolapStar.Column> COMPARATOR

Constructor Detail

Column

protected Column(Dialect.Datatype datatype)

Fake column.

Parameters:

datatype - Datatype

Method Detail

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getName

public String getName()

getBitPosition

public int getBitPosition()

getStar

public RolapStar getStar()

getTable

public RolapStar.Table getTable()

getSqlQuery

public SqlQuery getSqlQuery()

getNameColumn

public RolapStar.Column getNameColumn()

getParentColumn

public RolapStar.Column getParentColumn()

getUsagePrefix

public String getUsagePrefix()

isNameColumn

public boolean isNameColumn()

getExpression

public MondrianDef.Expression getExpression()

generateExprString

public String generateExprString(SqlQuery query)

Generates a SQL expression, which typically this looks like this: tableName.columnName.

getCardinality

public long getCardinality()

Get column cardinality from the schema cache if possible; otherwise issue a select count(distinct) query to retrieve the cardinality and stores it in the cache.

Returns:

the column cardinality.

createInExpr

public static String createInExpr(String expr,
                                  StarColumnPredicate predicate,
                                  Dialect.Datatype datatype,
                                  SqlQuery sqlQuery)

Generates a predicate that a column matches one of a list of values.

Several possible outputs, depending upon whether the there are nulls:

• One not-null value: foo.bar = 1
• All values not null: foo.bar in (1, 2, 3)
Null and not null values: (foo.bar is null or foo.bar in (1, 2))
• Only null values: foo.bar is null
• String values: foo.bar in ('a', 'b', 'c')

toString

public String toString()

Overrides:

toString in class Object

print

public void print(PrintWriter pw,
                  String prefix)

Prints this column.

Parameters:

pw - Print writer

prefix - Prefix to print first, such as spaces for indentation

getDatatype

public Dialect.Datatype getDatatype()

getDatatypeString

public String getDatatypeString(Dialect dialect)

Returns a string representation of the datatype of this column, in the dialect specified. For example, 'DECIMAL(10, 2) NOT NULL'.

Parameters:

dialect - Dialect

Returns:

String representation of column's datatype

getInternalType

public SqlStatement.Type getInternalType()