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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.TermType;
import com.yahoo.prelude.query.WordItem;
import com.yahoo.prelude.semantics.engine.Match;
import com.yahoo.prelude.semantics.engine.RuleEvaluation;
import com.yahoo.protect.Validator;
/**
* A literal term produced by a production rule
*
* @author bratseth
*/
public class LiteralTermProduction extends TermProduction {
private String literal;
/**
* Creates a new produced literal term
*
* @param literal the label of the condition this should take it's value from
*/
public LiteralTermProduction(String literal) {
super();
setLiteral(literal);
}
/**
* Creates a new produced literal term
*
* @param literal the label of the condition this should take it's value from
* @param termType the type of term to produce
*/
public LiteralTermProduction(String literal, TermType termType) {
super(termType);
setLiteral(literal);
}
/**
* Creates a new produced literal term
*
* @param label the label of the produced term
* @param literal this term word
* @param termType the type of term to produce
*/
public LiteralTermProduction(String label,String literal, TermType termType) {
super(label,termType);
setLiteral(literal);
}
/** The literal term value, never null */
public void setLiteral(String literal) {
Validator.ensureNotNull("A produced term",literal);
this.literal=literal;
}
/** Returns the term word produced, never null */
public String getLiteral() { return literal; }
public void produce(RuleEvaluation e,int offset) {
WordItem newItem=new WordItem(literal,getLabel());
if (replacing) {
Match matched=e.getNonreferencedMatch(0);
insertMatch(e,matched,newItem,offset);
}
else {
newItem.setWeight(getWeight());
if (e.getTraceLevel()>=6)
e.trace(6,"Adding '" + newItem + "'");
e.addItem(newItem,getTermType());
}
}
public String toInnerTermString() {
return getLabelString() + literal;
}
}
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