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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.searcher;
import java.util.*;
import com.yahoo.component.ComponentId;
import com.yahoo.search.result.Hit;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.prelude.fastsearch.FastHit;
import com.yahoo.prelude.hitfield.FieldPart;
import com.yahoo.prelude.hitfield.HitField;
import com.yahoo.prelude.hitfield.ImmutableFieldPart;
import com.yahoo.prelude.hitfield.StringFieldPart;
import com.yahoo.search.Searcher;
import com.yahoo.search.searchchain.Execution;
/**
* A searcher which does quoting based on a quoting table.
*
* May be extended to do quoting template sensitive.
*
* @author Steinar Knutsen
*/
public class QuotingSearcher extends Searcher {
// Char to String
private QuoteTable quoteTable;
private synchronized void setQuoteTable(QuoteTable quoteTable) {
this.quoteTable = quoteTable;
}
private synchronized QuoteTable getQuoteTable() {
return quoteTable;
}
private static class QuoteTable {
private final int lowerUncachedBound;
private final int upperUncachedBound;
private final Map<Character, String> quoteMap;
private final String[] lowerTable;
private final boolean useMap;
private final boolean isEmpty;
public QuoteTable(QrQuotetableConfig config) {
int minOrd = 0;
int maxOrd = 0;
String[] newLowerTable = new String[256];
boolean newUseMap = false;
boolean newIsEmpty = true;
Map<Character, String> newQuoteMap = new HashMap<>();
for (Iterator<?> i = config.character().iterator(); i.hasNext(); ) {
QrQuotetableConfig.Character character = (QrQuotetableConfig.Character)i.next();
if (character.ordinal() > 256) {
newIsEmpty = false;
newQuoteMap.put((char)character.ordinal(), character.quoting());
newUseMap = true;
if (minOrd == 0 || character.ordinal() < minOrd)
minOrd = character.ordinal();
if (maxOrd == 0 || character.ordinal() > maxOrd)
maxOrd = character.ordinal();
}
else {
newIsEmpty = false;
newLowerTable[character.ordinal()] = character.quoting();
}
}
lowerUncachedBound = minOrd;
upperUncachedBound = maxOrd;
quoteMap = newQuoteMap;
useMap = newUseMap;
isEmpty = newIsEmpty;
lowerTable = newLowerTable;
}
public String get(char c) {
if (isEmpty) return null;
int ord = c;
if (ord < 256) {
return lowerTable[ord];
}
else {
if ((!useMap) || ord < lowerUncachedBound || ord > upperUncachedBound)
return null;
else
return quoteMap.get(c);
}
}
public boolean isEmpty() {
return isEmpty;
}
}
public QuotingSearcher(ComponentId id, QrQuotetableConfig config) {
super(id);
setQuoteTable(new QuoteTable(config));
}
@Override
public Result search(Query query, Execution execution) {
Result result = execution.search(query);
execution.fill(result);
QuoteTable translations = getQuoteTable();
if (translations == null || translations.isEmpty()) return result;
for (Iterator<Hit> i = result.hits().deepIterator(); i.hasNext(); ) {
Hit h = i.next();
if (h instanceof FastHit)
quoteFields((FastHit) h, translations);
}
return result;
}
private void quoteFields(FastHit hit, QuoteTable translations) {
hit.forEachField((fieldName, fieldValue) -> {
if (fieldValue != null) {
Class<?> fieldType = fieldValue.getClass();
if (fieldType.equals(HitField.class))
quoteField((HitField) fieldValue, translations);
else if (fieldType.equals(String.class))
quoteField(hit, fieldName, (String) fieldValue, translations);
}
});
}
private void quoteField(Hit hit, String fieldname, String toQuote, QuoteTable translations) {
List<FieldPart> l = translate(toQuote, translations, true);
if (l != null) {
HitField hf = new HitField(fieldname, toQuote);
hf.setTokenizedContent(l);
hit.setField(fieldname, hf);
}
}
private void quoteField(HitField field, QuoteTable translations) {
for (ListIterator<FieldPart> i = field.listIterator(); i.hasNext(); ) {
FieldPart f = i.next();
if ( ! f.isFinal()) {
List<FieldPart> newFieldParts = translate(f.getContent(), translations, f.isToken());
if (newFieldParts != null) {
i.remove();
for (Iterator<FieldPart> j = newFieldParts.iterator(); j.hasNext(); ) {
i.add(j.next());
}
}
}
}
}
private List<FieldPart> translate(String toQuote, QuoteTable translations, boolean isToken) {
List<FieldPart> newFieldParts = null;
int lastIdx = 0;
for (int i = 0; i < toQuote.length(); i++) {
String quote = translations.get(toQuote.charAt(i));
if (quote != null) {
if (newFieldParts == null)
newFieldParts = new ArrayList<>();
if (lastIdx != i)
newFieldParts.add(new StringFieldPart(toQuote.substring(lastIdx, i), isToken));
String initContent = Character.toString(toQuote.charAt(i));
newFieldParts.add(new ImmutableFieldPart(initContent, quote, isToken));
lastIdx = i+1;
}
}
if (lastIdx > 0 && lastIdx < toQuote.length())
newFieldParts.add(new StringFieldPart(toQuote.substring(lastIdx), isToken));
return newFieldParts;
}
}
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