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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 com.yahoo.component.chain.dependencies.After;
import com.yahoo.prelude.Index;
import com.yahoo.prelude.IndexFacts;
import com.yahoo.prelude.query.Item;
import com.yahoo.prelude.query.PredicateQueryItem;
import com.yahoo.prelude.query.SimpleIndexedItem;
import com.yahoo.prelude.query.ToolBox;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.Searcher;
import com.yahoo.search.querytransform.BooleanSearcher;
import com.yahoo.search.result.ErrorMessage;
import com.yahoo.search.searchchain.Execution;
import java.util.ArrayList;
import java.util.List;
/**
* Checks that predicate queries don't use values outside the defined upper/lower bounds.
*
* @author Magnar Nedland
*/
@After(BooleanSearcher.PREDICATE)
public class ValidatePredicateSearcher extends Searcher {
@Override
public Result search(Query query, Execution execution) {
List<ErrorMessage> errorMessages = validate(query, execution.context().getIndexFacts().newSession(query));
if (!errorMessages.isEmpty()) {
Result r = new Result(query);
errorMessages.forEach(msg -> r.hits().addError(msg));
return r;
}
return execution.search(query);
}
private List<ErrorMessage> validate(Query query, IndexFacts.Session indexFacts) {
ValidatePredicateVisitor visitor = new ValidatePredicateVisitor(indexFacts);
ToolBox.visit(visitor, query.getModel().getQueryTree().getRoot());
return visitor.errorMessages;
}
private static class ValidatePredicateVisitor extends ToolBox.QueryVisitor {
private final IndexFacts.Session indexFacts;
final List<ErrorMessage> errorMessages = new ArrayList<>();
public ValidatePredicateVisitor(IndexFacts.Session indexFacts) {
this.indexFacts = indexFacts;
}
@Override
public boolean visit(Item item) {
if (item instanceof PredicateQueryItem) {
visit((PredicateQueryItem) item);
}
if (item instanceof SimpleIndexedItem) {
visit((SimpleIndexedItem) item);
}
return true;
}
private void visit(PredicateQueryItem item) {
Index index = getIndexFromUnionOfDocumentTypes(item.getIndexName());
if (!index.isPredicate()) {
errorMessages.add(ErrorMessage.createIllegalQuery(String.format("Index '%s' is not a predicate attribute.", index.getName())));
}
for (PredicateQueryItem.RangeEntry entry : item.getRangeFeatures()) {
long value = entry.getValue();
if (value < index.getPredicateLowerBound() || value > index.getPredicateUpperBound()) {
errorMessages.add(
ErrorMessage.createIllegalQuery(String.format("%s=%d outside configured predicate bounds.", entry.getKey(), value)));
}
}
}
private void visit(SimpleIndexedItem item) {
String indexName = item.getIndexName();
Index index = getIndexFromUnionOfDocumentTypes(indexName);
if (index.isPredicate()) {
errorMessages.add(
ErrorMessage.createIllegalQuery(String.format("Index '%s' is predicate attribute and can only be used in conjunction with a predicate query operator.", indexName)));
}
}
private Index getIndexFromUnionOfDocumentTypes(String indexName) {
return indexFacts.getIndex(indexName);
}
@Override
public void onExit() {}
}
}
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