package edu.northwestern.at.morphadorner.tools.taggertrainer;
/* Please see the license information at the end of this file. */
import java.util.*;
/** A Part of Speech Tagger rule interface.
*
* <p>
* This defines an interface for rule-based part of speech tag
* replacment in a tagged corpus. Each rule locates all the words
* in a corpus tagged with a specific original part of speech tag and
* satisfying a specific condition. When the condition is satisfied,
* the rule replaces the original tag with a replacement tag.
* </p>
*
* <p>
* The original tag, the replacement tag, and the condition for
* replacement are fixed during rule instantiation.
* The replacement conditions may involve the spelling and/or tag of
* a word as well as the word's position with respect to other words
* and their tags in the corpus.
* </p>
*/
public interface TaggerRule
{
/** Apply this rule to all training data.
*
* @param trainingData Training data as a list.
*
* @return count of sites to which rule was
* successfully applied.
*/
public int apply( List<TrainingWord> trainingData );
/** Apply this rule to a specific training site.
*
* @param site Index (0-based) of training site
* at which to apply rule.
* @param trainingData Training data as a list.
*
* @return true if rule was successfully applied.
*/
public boolean apply( int site , List<TrainingWord> trainingData );
/** Apply this rule to a a list of training sites.
*
* @param sites Indices (0-based) of training sites
* at which to apply rule.
* @param trainingData Training data as a list.
*
* @return count of sites to which rule was
* successfully applied.
*/
public int apply( int[] sites , List<TrainingWord> trainingData );
/** See if this rule applies to a training site.
*
* @param site Index (0-based) of training site
* at which to check that rule applies.
* @param trainingData Training data.
*
* @return = -1: rule changes correct tag to
* incorrect.
* = 0: rule leaves correct tag alone,
* or rule does not apply to
* specified site.
* = 1: rule changes incorrect
* tag to correct.
*/
public int applies( int site , List<TrainingWord> trainingData );
/** Return original tag.
*
* @return The tag which this rule may replace.
*/
public String getOriginalTag();
/** Return replacement tag.
*
* @return The tag with which this rule replace the
* existing tag.
*/
public String getReplacementTag();
}
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