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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.prelude.searcher;
import java.util.Optional;
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.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.Collection;
/**
* Checks that predicate queries don't use values outside the defined upper/lower bounds.
*
* @author <a href="mailto:magnarn@yahoo-inc.com">Magnar Nedland</a>
*/
@After(BooleanSearcher.PREDICATE)
public class ValidatePredicateSearcher extends Searcher {
@Override
public Result search(Query query, Execution execution) {
Optional<ErrorMessage> e = validate(query, execution.context().getIndexFacts().newSession(query));
if (e.isPresent()) {
Result r = new Result(query);
r.hits().addError(e.get());
return r;
}
return execution.search(query);
}
private Optional<ErrorMessage> validate(Query query, IndexFacts.Session indexFacts) {
ValidatePredicateVisitor visitor = new ValidatePredicateVisitor(indexFacts);
ToolBox.visit(visitor, query.getModel().getQueryTree().getRoot());
return visitor.errorMessage;
}
private static class ValidatePredicateVisitor extends ToolBox.QueryVisitor {
private final IndexFacts.Session indexFacts;
public Optional<ErrorMessage> errorMessage = Optional.empty();
public ValidatePredicateVisitor(IndexFacts.Session indexFacts) {
this.indexFacts = indexFacts;
}
@Override
public boolean visit(Item item) {
if (item instanceof PredicateQueryItem) {
visit((PredicateQueryItem) item);
}
return true;
}
private void visit(PredicateQueryItem item) {
Index index = getIndexFromUnionOfDocumentTypes(item);
for (PredicateQueryItem.RangeEntry entry : item.getRangeFeatures()) {
long value = entry.getValue();
if (value < index.getPredicateLowerBound() || value > index.getPredicateUpperBound()) {
errorMessage = Optional.of(ErrorMessage.createIllegalQuery(
String.format("%s=%d outside configured predicate bounds.", entry.getKey(), value)));
}
}
}
private Index getIndexFromUnionOfDocumentTypes(PredicateQueryItem item) {
return indexFacts.getIndex(item.getIndexName());
}
@Override
public void onExit() {}
}
}
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