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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.semantics.rule;
import com.yahoo.prelude.query.TermItem;
import com.yahoo.prelude.semantics.engine.NameSpace;
import com.yahoo.prelude.semantics.engine.RuleEvaluation;
/**
* A term in a rule
*
* @author bratseth
*/
public class TermCondition extends Condition {
private String term,termPlusS;
/** Creates an invalid term */
public TermCondition() { }
public TermCondition(String term) {
this(null,term);
}
public TermCondition(String label,String term) {
super(label);
this.term=term;
termPlusS=term + "s";
}
public String getTerm() { return term; }
public void setTerm(String term) {
this.term=term;
termPlusS=term + "s";
}
protected boolean doesMatch(RuleEvaluation e) {
// TODO: Move this into the respective namespaces when query becomes one */
if (getNameSpace()!=null) {
NameSpace nameSpace=e.getEvaluation().getNameSpace(getNameSpace());
return nameSpace.matches(term,e);
}
else {
if (e.currentItem()==null)
return false;
if (!labelMatches(e)) return false;
String matchedValue=termMatches(e.currentItem().getItem(),e.getEvaluation().getStemming());
boolean matches=matchedValue!=null && labelMatches(e.currentItem().getItem(),e);
if ((matches && !e.isInNegation() || (!matches && e.isInNegation()))) {
e.addMatch(e.currentItem(),matchedValue);
e.setValue(term);
e.next();
}
return matches;
}
}
/** Returns a non-null replacement term if there is a match, null otherwise */
private String termMatches(TermItem queryTerm,boolean stemming){
String queryTermString=queryTerm.stringValue();
// The terms are the same
boolean matches=queryTermString.equals(term);
if (matches) return term;
if (stemming)
if (termMatchesWithStemming(queryTermString)) return term;
return null;
}
private boolean termMatchesWithStemming(String queryTermString) {
if (queryTermString.length()<3) return false; // Don't stem very short terms
// The query term minus s is the same
boolean matches=queryTermString.equals(termPlusS);
if (matches) return true;
// The query term plus s is the same
matches=term.equals(queryTermString + "s");
if (matches) return true;
return false;
}
public String toInnerString() {
return getLabelString() + term;
}
}
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