com.pervasive.datarush.tokens

Interface TokenValued

All Superinterfaces:

TokenTyped

All Known Subinterfaces:

BinaryInputField, BinaryValued, BinaryValuedIterator, BooleanInputField, BooleanValued, BooleanValuedIterator, CharInputField, CharValued, CharValuedIterator, CloseableRecordValuedIterator, DataRegister, DataToken, DateInputField, DateValued, DateValuedIterator, DoubleInputField, DoubleValued, DoubleValuedIterator, FloatInputField, FloatValued, FloatValuedIterator, IntInputField, IntValued, IntValuedIterator, LongInputField, LongValued, LongValuedIterator, NumericInputField, NumericValued, NumericValuedIterator, ObjectInputField<T>, ObjectValued<O>, ObjectValuedIterator<T>, RecordInput, RecordValued, RecordValuedIterator, ScalarInputField, ScalarRegister, ScalarToken, ScalarValued, ScalarValuedIterator, SeekableRecordValuedIterator, SeekableScalarValuedIterator, SeekableTokenValuedIterator, SteppableRecordValued, StringInputField, StringValued, StringValuedIterator, TimeInputField, TimestampInputField, TimestampValued, TimestampValuedIterator, TimeValued, TimeValuedIterator, TokenValuedIterator

All Known Implementing Classes:

AbstractRecordValued, BinaryRegister, BinaryToken, BooleanRegister, BooleanToken, CharRegister, CharToken, CompositeValue, DatasetIterator, DateRegister, DateToken, DateTokenConverter, DoubleRegister, DoubleToken, FloatRegister, FloatToken, IntRegister, IntToken, LongRegister, LongToken, NullToken, NumericRegister, NumericToken, ObjectRegister, ObjectToken, RecordMap.RecordMapIterator, RecordRegister, RecordToken, RecordValuedFilter, SparseRecordRegister, StringRegister, StringToken, TimeRegister, TimestampRegister, TimestampToken, TimestampTokenConverter, TimeToken

public interface TokenValued
extends TokenTyped

An representation of a nullable data value. Tokens in the DataRush framework support a concept of null value analogous to SQL. Specifically, a token may not have a value assigned, in which case it is referred to as null valued. Tokens which do have a value are called non-null and contain a value appropriate to their type.

Method Summary

Modifier and Type	Method and Description
TokenType	getType() Gets the data type of the token.
boolean	isNull() Indicates whether the token is null valued.

Method Detail

getType

TokenType getType()

Gets the data type of the token. This type will dictate the valid values that can be contained.

Specified by:

getType in interface TokenTyped

Returns:

the token type.

isNull

boolean isNull()

Indicates whether the token is null valued. Tokens support null values analogous to SQL. Before accessing the value of the container, it is usually best to ensure it is not null valued using this method.

Returns:

true if the token is null valued, false otherwise