Package mondrian.olap.type

Class DimensionType

  • All Implemented Interfaces:
    Type
    public class DimensionType
extends Object
implements Type
    The type of an expression which represents a Dimension.
    Since:
    Feb 17, 2005
    Author:
    jhyde

    • Constructor Detail

      • DimensionType

        public DimensionType​(Dimension dimension)
        Creates a type representing a dimension.
        Parameters:
        dimension - Dimension that values of this type must belong to, or null if the dimension is unknown

    • Method Detail

      • usesDimension

        public boolean usesDimension​(Dimension dimension,
                             boolean definitely)
        Description copied from interface: Type
        Returns whether this type contains a given dimension.

        For example:

        • DimensionType([Gender]) uses only the [Gender] dimension.
        • TupleType(MemberType([Gender]), MemberType([Store])) uses [Gender] and [Store] dimensions.

        The definitely parameter comes into play when the dimensional information is incomplete. For example, when applied to TupleType(MemberType(null), MemberType([Store])), usesDimension([Gender], false) returns true because it is possible that the expression returns a member of the [Gender] dimension; but usesDimension([Gender], true) returns true because it is possible that the expression returns a member of the [Gender] dimension.

        Specified by:
        usesDimension in interface Type
        Parameters:
        dimension - Dimension
        definitely - If true, returns true only if this type definitely uses the dimension
        Returns:
        whether this Type uses the given Dimension

      • usesHierarchy

        public boolean usesHierarchy​(Hierarchy hierarchy,
                             boolean definitely)
        Description copied from interface: Type
        Returns whether this type contains a given hierarchy.

        For example:

        • HierarchyType([Customer].[Gender]) uses only the [Customer].[Gender] hierarchy.
        • TupleType(MemberType([Customer].[Gender]), MemberType([Store].[Store])) uses [Gender] and [Store] dimensions.

        The definitely parameter comes into play when the dimensional information is incomplete. For example, when applied to TupleType(MemberType([Customer]), MemberType([Store])), usesDimension([Customer].[Gender], false) returns true because the expression returns a member of one hierarchy of the [Customer] dimension and that might be a member of the [Customer].[Gender] hierarchy; but usesDimension([Customer].[Gender], true) returns false because might return a member of a different hierarchy, such as [Customer].[State].

        Specified by:
        usesHierarchy in interface Type
        Parameters:
        hierarchy - Hierarchy
        definitely - If true, returns true only if this type definitely uses the hierarchy
        Returns:
        whether this Type uses the given Hierarchy

      • getHierarchy

        public Hierarchy getHierarchy()
        Description copied from interface: Type
        Returns the Hierarchy of this Type, or null if not known. If not applicable, throws.
        Specified by:
        getHierarchy in interface Type
        Returns:
        the Hierarchy of this type, or null if not known

      • getLevel

        public Level getLevel()
        Description copied from interface: Type
        Returns the Level of this Type, or null if not known. If not applicable, throws.
        Specified by:
        getLevel in interface Type
        Returns:
        the Level of this Type

      • getDimension

        public Dimension getDimension()
        Description copied from interface: Type
        Returns the Dimension of this Type, or null if not known. If not applicable, throws.
        Specified by:
        getDimension in interface Type
        Returns:
        the Dimension of this Type, or null if not known.

      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class Object

      • computeCommonType

        public Type computeCommonType​(Type type,
                              int[] conversionCount)
        Description copied from interface: Type
        Returns a Type which is more general than this and the given Type. The type returned is broad enough to hold any value of either type, but no broader. If there is no such type, returns null.

        Some examples:

        • The common type for StringType and NumericType is ScalarType.
        • The common type for NumericType and DecimalType(4, 2) is NumericType.
        • DimensionType and NumericType have no common type.

        If conversionCount is not null, implicit conversions such as HierarchyType to DimensionType are considered; the parameter is incremented by the number of conversions performed.

        Some examples:

        • The common type for HierarchyType(hierarchy=Time.Weekly) and LevelType(dimension=Time), if conversions are allowed, is HierarchyType(dimension=Time).

        One use of common types is to determine the types of the arguments to the Iif function. For example, the call

        Iif(1 > 2, [Measures].[Unit Sales], 5)
        has type ScalarType, because DecimalType(-1, 0) is a subtype of ScalarType, and MeasureType can be converted implicitly to ScalarType.
        Specified by:
        computeCommonType in interface Type
        Parameters:
        type - Type
        conversionCount - Number of conversions; output parameter that is incremented each time a conversion is performed; if null, conversions are not considered
        Returns:
        More general type

      • isInstance

        public boolean isInstance​(Object value)
        Description copied from interface: Type
        Returns whether a value is valid for a type.
        Specified by:
        isInstance in interface Type
        Parameters:
        value - Value
        Returns:
        Whether value is valid for this type

      • getArity

        public int getArity()
        Description copied from interface: Type
        Returns the number of fields in a tuple type, or a set of tuples. For most other types, in particular member type, returns 1.
        Specified by:
        getArity in interface Type
        Returns:
        Arity of type