Package mondrian.rolap.agg

Class ValueColumnPredicate

java.lang.Object

mondrian.rolap.agg.AbstractColumnPredicate

mondrian.rolap.agg.ValueColumnPredicate

All Implemented Interfaces:

Comparable, StarColumnPredicate, StarPredicate

Direct Known Subclasses:

MemberColumnPredicate

public class ValueColumnPredicate
extends AbstractColumnPredicate
implements Comparable

A constraint which requires a column to have a particular value.

Since:

Nov 2, 2006

Author:

jhyde

Nested Class Summary

Nested classes/interfaces inherited from class mondrian.rolap.agg.AbstractColumnPredicate

AbstractColumnPredicate.Factory

Nested classes/interfaces inherited from interface mondrian.rolap.StarColumnPredicate

StarColumnPredicate.Overlap

Field Summary

Fields inherited from class mondrian.rolap.agg.AbstractColumnPredicate

constrainedColumn

Fields inherited from interface mondrian.rolap.StarPredicate

WILDCARD

Constructor Summary

Constructors

Constructor	Description
ValueColumnPredicate(RolapStar.Column constrainedColumn, Object value)	Creates a column constraint.

Method Summary

Modifier and Type	Method	Description
BitKey	checkInList(BitKey inListLHSBitKey)
StarColumnPredicate	cloneWithColumn(RolapStar.Column column)	This method is required because unfortunately some ColumnPredicate objects are created without a column.
int	compareTo(Object o)
void	describe(StringBuilder buf)	Appends a description of this predicate to a StringBuilder.
boolean	equalConstraint(StarPredicate that)	Returns whether this Predicate has the same constraining effect as the other constraint.
boolean	equals(Object other)
boolean	evaluate(Object value)	Returns whether this constraint would return true for a given value.
Object	getValue()	Returns the value which the column is compared to.
int	hashCode()
StarColumnPredicate.Overlap	intersect(StarColumnPredicate predicate)	Applies this predicate to a predicate from the axis of a segment, and tests for overlap.
boolean	mightIntersect(StarPredicate other)	Returns whether this predicate might intersect another predicate.
StarColumnPredicate	minus(StarPredicate predicate)	Returns the logical inverse of this Predicate.
void	toInListSql(SqlQuery sqlQuery, StringBuilder buf)
void	toSql(SqlQuery sqlQuery, StringBuilder buf)
String	toString()
void	values(Collection<Object> collection)	Adds the values in this constraint to a collection.

Methods inherited from class mondrian.rolap.agg.AbstractColumnPredicate

and, cloneListWithColumn, evaluate, getConstrainedColumn, getConstrainedColumnBitKey, getConstrainedColumnList, or, orColumn

Methods inherited from class java.lang.Object

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

Constructor Details

ValueColumnPredicate

public ValueColumnPredicate(RolapStar.Column constrainedColumn,
 Object value)

Creates a column constraint.

Parameters:

value - Value to constraint the column to. (We require that it is Comparable because we will sort the values in order to generate deterministic SQL.)

Method Details

getValue

public Object getValue()

Returns the value which the column is compared to.

toString

public String toString()

Overrides:

toString in class AbstractColumnPredicate

equalConstraint

public boolean equalConstraint(StarPredicate that)

Description copied from interface: StarPredicate

Returns whether this Predicate has the same constraining effect as the other constraint. This is weaker than Object.equals(Object): it is possible for two different members to constrain the same column in the same way.

Specified by:

equalConstraint in interface StarPredicate

Overrides:

equalConstraint in class AbstractColumnPredicate

Parameters:

that - Other predicate

Returns:

whether the other predicate is equivalent

compareTo

public int compareTo(Object o)

Specified by:

compareTo in interface Comparable

equals

public boolean equals(Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

values

public void values(Collection<Object> collection)

Description copied from interface: StarColumnPredicate

Adds the values in this constraint to a collection.

Specified by:

values in interface StarColumnPredicate

Parameters:

collection - Collection to add values to

evaluate

public boolean evaluate(Object value)

Description copied from interface: StarColumnPredicate

Returns whether this constraint would return true for a given value.

Specified by:

evaluate in interface StarColumnPredicate

Parameters:

value - Value

Returns:

Whether predicate is true

describe

public void describe(StringBuilder buf)

Description copied from interface: StarPredicate

Appends a description of this predicate to a StringBuilder. For example:

• =any
• =5
• in (2, 4, 6)

Specified by:

describe in interface StarPredicate

Parameters:

buf - Builder to append to

intersect

public StarColumnPredicate.Overlap intersect(StarColumnPredicate predicate)

Description copied from interface: StarColumnPredicate

Applies this predicate to a predicate from the axis of a segment, and tests for overlap. The result might be that there is no overlap, full overlap (so the constraint can be removed), or partial overlap (so the constraint will need to be replaced with a stronger constraint, say 'x > 10' is replaced with 'x > 20').

Specified by:

intersect in interface StarColumnPredicate

Parameters:

predicate - Predicate

Returns:

description of overlap between predicates, if any

mightIntersect

public boolean mightIntersect(StarPredicate other)

Description copied from interface: StarColumnPredicate

Returns whether this predicate might intersect another predicate. That is, whether there might be a value which holds true for both constraints.

Specified by:

mightIntersect in interface StarColumnPredicate

Parameters:

other - Other constraint

Returns:

Whether constraints intersect

minus

public StarColumnPredicate minus(StarPredicate predicate)

Description copied from interface: StarPredicate

Returns the logical inverse of this Predicate. The result is a Predicate which holds whenever this predicate holds but the other does not.

Specified by:

minus in interface StarColumnPredicate

Specified by:

minus in interface StarPredicate

Parameters:

predicate - Predicate

Returns:

Combined predicate

cloneWithColumn

public StarColumnPredicate cloneWithColumn(RolapStar.Column column)

Description copied from interface: StarColumnPredicate

This method is required because unfortunately some ColumnPredicate objects are created without a column.

We call this method to provide a fake column, then call StarPredicate.toSql(mondrian.rolap.sql.SqlQuery, StringBuilder).

todo: remove this method when bug MONDRIAN-313 and bug MONDRIAN-314 are fixed.

Specified by:

cloneWithColumn in interface StarColumnPredicate

toSql

public void toSql(SqlQuery sqlQuery,
 StringBuilder buf)

Specified by:

toSql in interface StarPredicate

Overrides:

toSql in class AbstractColumnPredicate

checkInList

public BitKey checkInList(BitKey inListLHSBitKey)

toInListSql

public void toInListSql(SqlQuery sqlQuery,
 StringBuilder buf)