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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.searchdefinition.processing;
import com.yahoo.config.application.api.DeployLogger;
import com.yahoo.searchdefinition.RankProfileRegistry;
import com.yahoo.document.*;
import com.yahoo.searchdefinition.Search;
import com.yahoo.searchdefinition.document.Matching;
import com.yahoo.searchdefinition.document.SDField;
import com.yahoo.searchdefinition.document.Stemming;
import com.yahoo.vespa.indexinglanguage.ExpressionSearcher;
import com.yahoo.vespa.indexinglanguage.expressions.*;
import com.yahoo.vespa.model.container.search.QueryProfiles;
/**
* The implementation of exact matching
*
* @author bratseth
*/
public class ExactMatch extends Processor {
public static final String DEFAULT_EXACT_TERMINATOR = "@@";
public ExactMatch(Search search, DeployLogger deployLogger, RankProfileRegistry rankProfileRegistry, QueryProfiles queryProfiles) {
super(search, deployLogger, rankProfileRegistry, queryProfiles);
}
@Override
public void process() {
for (SDField field : search.allConcreteFields()) {
Matching.Type matching = field.getMatching().getType();
if (matching.equals(Matching.Type.EXACT) || matching.equals(Matching.Type.WORD)) {
implementExactMatch(field, search);
} else if (field.getMatching().getExactMatchTerminator() != null) {
warn(search, field, "exact-terminator requires 'exact' matching to have any effect.");
}
}
}
private void implementExactMatch(SDField field, Search search) {
field.setStemming(Stemming.NONE);
field.getNormalizing().inferLowercase();
if (field.getMatching().getType().equals(Matching.Type.WORD)) {
field.addQueryCommand("word");
} else { // exact
String exactTerminator = DEFAULT_EXACT_TERMINATOR;
if (field.getMatching().getExactMatchTerminator() != null &&
! field.getMatching().getExactMatchTerminator().equals(""))
{
exactTerminator = field.getMatching().getExactMatchTerminator();
} else {
warn(search, field,
"With 'exact' matching, an exact-terminator is needed (using \""
+ exactTerminator +"\" as terminator)");
}
field.addQueryCommand("exact " + exactTerminator);
// The following part illustrates how nice it would have been with canonical
// representation of indices
if (field.doesIndexing()) {
exactMatchSettingsForField(field);
}
}
ScriptExpression script = field.getIndexingScript();
if (new ExpressionSearcher<>(IndexExpression.class).containedIn(script)) {
field.setIndexingScript((ScriptExpression)new MyProvider(search).convert(field.getIndexingScript()));
}
}
private void exactMatchSettingsForField(SDField field) {
field.getRanking().setFilter(true);
}
private static class MyProvider extends TypedTransformProvider {
MyProvider(Search search) {
super(ExactExpression.class, search);
}
@Override
protected boolean requiresTransform(Expression exp, DataType fieldType) {
return exp instanceof OutputExpression;
}
@Override
protected Expression newTransform(DataType fieldType) {
Expression exp = new ExactExpression();
if (fieldType instanceof CollectionDataType) {
exp = new ForEachExpression(exp);
}
return exp;
}
}
}
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