Module datarush.library

Package com.pervasive.datarush.tokens

Provides classes and utilities for working with data tokens. Tokens are the fundamental data units within DataRush.

Operators are connected to one another consuming and emitting tokens via ports. All tokens have two properties:

• a data type
• a value, potentially unset. If unset, the token is called null valued.

There are two types of tokens. Scalar tokens are atomic, having a scalar type. Composite tokens, representing record data, consist of one or more scalar tokens, each representing a field of the record. These have a record type, describing the record schema.

Interface Summary

Interface	Description
DataRegister	A mutable TokenValued object.
DataToken	An immutable TokenValued object.
ModificationCountProvider	A monotonically increasing sequence of change numbers.
RetargetableObject	Represents a position in some sequence.
TokenComparator	An object for comparing tokens of compatible types.
TokenConverter	An object capable of converting tokens into other formats.
TokenPusher	An object capable of transferring a token from a random-access source to a target.
TokenSettable	An object holding a nullable data value which is mutable.
TokenValued	An representation of a nullable data value.

Class Summary

Class	Description
DefaultModificationCountProvider	Provides a change number sequence which is manually managed.
InputModificationCountProvider	A change sequence derived from an input port.
TokenComparators	A factory for creating TokenComparator objects.
TokenConverters	A factory for creating TokenConverter objects.
TokenRegisters	A factory for creating DataRegister objects.
TokenUtils	Utilities for working with token values.

Enum Summary

Enum	Description
DataRepresentation	Controls the representation of a dataset.
DataRepresentation.Base	The default value that is assumed for unspecified values.
TokenOrder	An ordering of token values.
TokenSorter	An object capable of producing a sort order permutation of a TokenSequence.