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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.schema.processing;
import com.yahoo.config.application.api.DeployLogger;
import com.yahoo.document.CollectionDataType;
import com.yahoo.document.DataType;
import com.yahoo.schema.RankProfileRegistry;
import com.yahoo.schema.Schema;
import com.yahoo.schema.document.MatchType;
import com.yahoo.schema.document.SDField;
import com.yahoo.schema.document.Stemming;
import com.yahoo.vespa.indexinglanguage.ExpressionSearcher;
import com.yahoo.vespa.indexinglanguage.expressions.ExactExpression;
import com.yahoo.vespa.indexinglanguage.expressions.Expression;
import com.yahoo.vespa.indexinglanguage.expressions.ForEachExpression;
import com.yahoo.vespa.indexinglanguage.expressions.IndexExpression;
import com.yahoo.vespa.indexinglanguage.expressions.OutputExpression;
import com.yahoo.vespa.indexinglanguage.expressions.ScriptExpression;
import com.yahoo.vespa.indexinglanguage.linguistics.AnnotatorConfig;
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 = "@@";
ExactMatch(Schema schema, DeployLogger deployLogger, RankProfileRegistry rankProfileRegistry, QueryProfiles queryProfiles) {
super(schema, deployLogger, rankProfileRegistry, queryProfiles);
}
@Override
public void process(boolean validate, boolean documentsOnly) {
for (SDField field : schema.allConcreteFields()) {
processField(field, schema);
}
}
private void processField(SDField field, Schema schema) {
MatchType matching = field.getMatching().getType();
if (matching.equals(MatchType.EXACT) || matching.equals(MatchType.WORD)) {
implementExactMatch(field, schema);
} else if (field.getMatching().getExactMatchTerminator() != null) {
warn(schema, field, "exact-terminator requires 'exact' matching to have any effect.");
}
for (var structField : field.getStructFields()) {
processField(structField, schema);
}
}
private void implementExactMatch(SDField field, Schema schema) {
field.setStemming(Stemming.NONE);
field.getNormalizing().inferLowercase();
if (field.getMatching().getType().equals(MatchType.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 {
info(schema, field,
"With 'exact' matching, an exact-terminator is needed," +
" using default value '" + 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)) {
var maxTokenLength = field.getMatching().maxTokenLength();
if (maxTokenLength == null) {
maxTokenLength = AnnotatorConfig.getDefaultMaxTokenLength();
}
field.setIndexingScript(schema.getName(), (ScriptExpression)new MyProvider(schema, maxTokenLength).convert(field.getIndexingScript()));
}
}
private void exactMatchSettingsForField(SDField field) {
field.getRanking().setFilter(true);
}
private static class MyProvider extends TypedTransformProvider {
private int maxTokenLength;
MyProvider(Schema schema, int maxTokenLength)
{
super(ExactExpression.class, schema);
this.maxTokenLength = maxTokenLength;
}
@Override
protected boolean requiresTransform(Expression exp, DataType fieldType) {
return exp instanceof OutputExpression;
}
@Override
protected Expression newTransform(DataType fieldType) {
Expression exp = new ExactExpression(maxTokenLength);
if (fieldType instanceof CollectionDataType) {
exp = new ForEachExpression(exp);
}
return exp;
}
}
}
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