Package io.datarouter.scanner

Class CollatingScanner<T>

java.lang.Object

io.datarouter.scanner.BaseScanner<T>

io.datarouter.scanner.CollatingScanner<T>

All Implemented Interfaces:

Scanner<T>, Closeable, AutoCloseable

public class CollatingScanner<T>
extends BaseScanner<T>

Field Summary

Fields inherited from class io.datarouter.scanner.BaseScanner

current

Constructor Summary

Constructors

Constructor	Description
CollatingScanner(List<Scanner<T>> inputs, Comparator<? super T> comparator)

Method Summary

Modifier and Type	Method	Description
boolean	advance()	Try to update current to the next item, if there is one.
void	close()	Override to cleanup any resources.

Methods inherited from class io.datarouter.scanner.BaseScanner

current

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.datarouter.scanner.Scanner

advanceUntil, advanceWhile, allMatch, anyMatch, append, append, append, apply, batch, collate, collate, collect, collect, concat, concatIter, count, deduplicateConsecutive, deduplicateConsecutiveBy, deduplicateConsecutiveBy, distinct, distinctBy, each, exclude, findFirst, findLast, findMax, findMin, flush, forEach, groupBy, groupBy, groupBy, groupBy, hasAny, include, isEmpty, iterable, iterator, limit, link, list, listTo, map, maxN, minN, noneMatch, parallel, prefetch, reduce, reduce, retain, reverse, sample, shuffle, skip, sort, sort, splitBy, stream, streamDoubles, streamInts, streamLongs, take, then, toArray, toMap, toMap, toMap, toMap, toMap, toMapSupplied, toMapSupplied, toMapSupplied, toMapSupplied

Constructor Details

CollatingScanner

public CollatingScanner(List<Scanner<T>> inputs,
 Comparator<? super T> comparator)

Method Details

advance

public boolean advance()

Description copied from interface: Scanner

Try to update current to the next item, if there is one.

Returns:

True if it advanced

close

public void close()

Description copied from interface: Scanner

Override to cleanup any resources. The call should be propagated to all parent scanners. In the infrequent case of calling advance/current in an application, the Scanner should be explicitly closed. Because the included Scanner operations will close themselves when they fail to advance, it frequently a no-op for the application, unless closing the scanner before it stops advancing.