com.pervasive.datarush.tokens.record

Class FieldIteratorHelper

java.lang.Object

com.pervasive.datarush.tokens.record.FieldIteratorHelper

public final class FieldIteratorHelper
extends Object

Utility class for constructing field iterators associated with a given record type.

Constructor Summary

Constructors

Constructor and Description
FieldIteratorHelper(RecordTokenType recordType, FieldIteratorProperties properties) Create a new FieldIteratorHelper.

Method Summary

Modifier and Type	Method and Description
int	getRelativeIndex(ScalarValuedIterator iterator) Returns the index of the current field, relative to the selectedFields argument passed to this object's constructor.
ScalarValuedIterator	newFieldIterator(RecordValued record) Invokes RecordValued.newFieldIterator(ScalarTokenType, String[]), specifying the iteratorType and selectedFields arguments that were passed to this object's constructor.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FieldIteratorHelper

public FieldIteratorHelper(RecordTokenType recordType,
                           FieldIteratorProperties properties)

Create a new FieldIteratorHelper.

Parameters:

recordType - The type of record on which this helper will create iterators

properties - properties for the field iterator

Method Detail

newFieldIterator

public ScalarValuedIterator newFieldIterator(RecordValued record)

Invokes RecordValued.newFieldIterator(ScalarTokenType, String[]), specifying the iteratorType and selectedFields arguments that were passed to this object's constructor.

Parameters:

record - The record on which to create an iterator.

Returns:

A newly created iterator.

getRelativeIndex

public int getRelativeIndex(ScalarValuedIterator iterator)

Returns the index of the current field, relative to the selectedFields argument passed to this object's constructor.

Parameters:

iterator - A valid iterator, positioned on a field.

Returns:

the index of the current field in the iterator, relative to the selectedFields argument.