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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.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import com.yahoo.prelude.query.PhraseItem;
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 phrase produced by a production rule
*
* @author bratseth
*/
public class LiteralPhraseProduction extends TermProduction {
private List<String> terms=new ArrayList<>();
/** Creates a new produced literal phrase */
public LiteralPhraseProduction() {
super();
}
/**
* Creates a new produced literal phrase
*
* @param label the label of the produced term
*/
public LiteralPhraseProduction(String label) {
super(label);
}
/** Adds a term to this phrase */
public void addTerm(String term) {
Validator.ensureNotNull("A term in a produced phrase",term);
terms.add(term);
}
/** Returns a read only view of the terms produced by this, never null */
public List<String> getTerms() { return Collections.unmodifiableList(terms); }
public void produce(RuleEvaluation e,int offset) {
PhraseItem newPhrase=new PhraseItem();
newPhrase.setIndexName(getLabel());
for (String term : terms)
newPhrase.addItem(new WordItem(term));
if (replacing) {
Match matched=e.getNonreferencedMatch(0);
insertMatch(e,matched,newPhrase,offset);
}
else {
newPhrase.setWeight(getWeight());
if (e.getTraceLevel()>=6)
e.trace(6,"Adding '" + newPhrase + "'");
e.addItem(newPhrase,getTermType());
}
}
public String toInnerTermString() {
return getLabelString() + "\"" + getSpaceSeparated(terms) + "\"";
}
private String getSpaceSeparated(List<String> terms) {
StringBuilder builder=new StringBuilder();
for (Iterator<String> i=terms.iterator(); i.hasNext(); ) {
builder.append(i.next());
if (i.hasNext())
builder.append(" ");
}
return builder.toString();
}
}
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