Class ScannerSrxTextIterator

java.lang.Object

net.loomchild.segment.AbstractTextIterator

net.loomchild.segment.srx.legacy.ScannerSrxTextIterator

All Implemented Interfaces:

Iterator<String>, TextIterator

public class ScannerSrxTextIterator
extends AbstractTextIterator

Quick and Dirty implementation of TextIterator using Scanner.

Preliminary tests showed that it requires between 50% and 100% more time to complete than default text iterator. Probably the reason is slow matching of exception rules, but also splitting break-rule-only is slower.

This implementation is also not able to solve overlapping rules, like other one-big-pattern-scan iterators and there seems to be no easy solution. Although this should not happen in input patterns, in large SRX file using cascading it is very easy to miss this.

One solution could be sorting patterns by length, but this is sometimes impossible to do. For example:
Rules are "(ab)+" and "a(b)+"
Inputs are "ababx" and "abbbx"
For first input order of exception rules should be reversed for the text to be split as early as possible, but for the second input it shouldn't. The solution could be to use reluctant quantifiers instead of greedy ones, but that is changing the input patterns provided by user and therefore is undesirable.

Author:

loomchild

Constructor Summary

Constructors

Constructor	Description
ScannerSrxTextIterator(SrxDocument document, String languageCode, Reader reader, Map<String,Object> parameterMap)
ScannerSrxTextIterator(SrxDocument document, String languageCode, String text, Map<String,Object> parameterMap)

Method Summary

Modifier and Type	Method	Description
boolean	hasNext()
String	next()

Methods inherited from class AbstractTextIterator

remove, toString

Methods inherited from class Object

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

Methods inherited from interface Iterator

forEachRemaining

Constructor Details

ScannerSrxTextIterator

public ScannerSrxTextIterator(SrxDocument document,
 String languageCode,
 String text,
 Map<String,Object> parameterMap)

ScannerSrxTextIterator

public ScannerSrxTextIterator(SrxDocument document,
 String languageCode,
 Reader reader,
 Map<String,Object> parameterMap)

Method Details

hasNext

public boolean hasNext()

Returns:

true if there are more segments

next

public String next()

Returns:

next segment in text, or null if end of text has been reached.