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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.semantics.rule;
import java.util.Set;
import com.yahoo.prelude.query.Item;
import com.yahoo.prelude.query.TermType;
import com.yahoo.prelude.semantics.engine.EvaluationException;
import com.yahoo.prelude.semantics.engine.Match;
import com.yahoo.prelude.semantics.engine.ReferencedMatches;
import com.yahoo.prelude.semantics.engine.RuleEvaluation;
import com.yahoo.protect.Validator;
/**
* A term produced by a production rule which takes it's actual term value
* from one or more terms matched in the condition
*
* @author <a href="mailto:bratseth@yahoo-inc.com">Jon S Bratseth</a>
*/
public class ReferenceTermProduction extends TermProduction {
private String reference;
/**
* Creates a new produced reference term
*
* @param reference the label of the condition this should take it's value from
*/
public ReferenceTermProduction(String reference) {
super();
setReference(reference);
}
/**
* Creates a new produced reference term
*
* @param reference the label of the condition this should take it's value from
* @param termType the type of the term to produce
*/
public ReferenceTermProduction(String reference, TermType termType) {
super(termType);
setReference(reference);
}
/**
* Creates a new produced reference term
*
* @param label the label of the produced term
* @param reference the label of the condition this should take it's value from
*/
public ReferenceTermProduction(String label,String reference) {
super(label);
setReference(reference);
}
/**
* Creates a new produced reference term
*
* @param label the label of the produced term
* @param reference the label of the condition this should take it's value from
* @param termType the type of term to produce
*/
public ReferenceTermProduction(String label,String reference, TermType termType) {
super(label,termType);
setReference(reference);
}
/** The label of the condition this should take its value from, never null */
public void setReference(String reference) {
Validator.ensureNotNull("reference name of a produced reference term",reference);
this.reference =reference;
}
/** Returns the label of the condition this should take its value from, never null */
public String getReference() { return reference; }
void addMatchReferences(Set<String> matchReferences) {
matchReferences.add(reference);
}
public void produce(RuleEvaluation e,int offset) {
ReferencedMatches referencedMatches=e.getReferencedMatches(reference);
if (referencedMatches==null)
throw new EvaluationException("Referred match '" + reference + "' not found");
if (replacing) {
replaceMatches(e,referencedMatches);
}
else {
addMatches(e,referencedMatches);
}
}
public void replaceMatches(RuleEvaluation e,ReferencedMatches referencedMatches) {
Item referencedItem=referencedMatches.toItem(getLabel());
if (referencedItem==null) return;
e.removeMatches(referencedMatches);
insertMatch(e, referencedMatches.matchIterator().next(),referencedItem,0);
}
private void addMatches(RuleEvaluation e,ReferencedMatches referencedMatches) {
Item referencedItem=referencedMatches.toItem(getLabel());
if (referencedItem==null) return;
e.addItem(referencedItem,getTermType());
}
public String toInnerTermString() {
return getLabelString() + "[" + reference + "]";
}
}
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