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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.search.searchers;
import com.yahoo.component.chain.dependencies.After;
import com.yahoo.component.chain.dependencies.Before;
import com.yahoo.prelude.query.HasIndexItem;
import com.yahoo.prelude.query.Item;
import com.yahoo.prelude.query.PrefixItem;
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.schema.Field;
import com.yahoo.search.schema.SchemaInfo;
import com.yahoo.search.searchchain.Execution;
import com.yahoo.search.searchchain.PhaseNames;
import static com.yahoo.search.grouping.GroupingQueryParser.SELECT_PARAMETER_PARSING;
/**
* Validation of query operators against the schema which is searched
*
* @author bratseth
*/
@After(SELECT_PARAMETER_PARSING)
@Before(PhaseNames.BACKEND)
public class QueryValidator extends Searcher {
@Override
public Result search(Query query, Execution execution) {
var session = execution.context().schemaInfo().newSession(query);
ToolBox.visit(new TermSearchValidator(session), query.getModel().getQueryTree().getRoot());
ToolBox.visit(new PrefixSearchValidator(session), query.getModel().getQueryTree().getRoot());
return execution.search(query);
}
private abstract static class TermValidator extends ToolBox.QueryVisitor {
final SchemaInfo.Session schema;
public TermValidator(SchemaInfo.Session schema) {
this.schema = schema;
}
}
private static class TermSearchValidator extends TermValidator {
public TermSearchValidator(SchemaInfo.Session schema) {
super(schema);
}
@Override
public boolean visit(Item item) {
if (item instanceof HasIndexItem indexItem) {
var field = schema.fieldInfo(indexItem.getIndexName());
if (field.isEmpty()) return true;
if (field.get().type().kind() == Field.Type.Kind.TENSOR)
throw new IllegalArgumentException("Cannot search for terms in '" + indexItem.getIndexName() +
"': It is a tensor field");
}
return true;
}
}
private static class PrefixSearchValidator extends TermValidator {
public PrefixSearchValidator(SchemaInfo.Session schema) {
super(schema);
}
@Override
public boolean visit(Item item) {
if (schema.isStreaming()) return true; // prefix is always supported
if (item instanceof PrefixItem prefixItem) {
var field = schema.fieldInfo(prefixItem.getIndexName());
if (field.isEmpty()) return true;
if ( ! field.get().isAttribute())
throw new IllegalArgumentException("'" + prefixItem.getIndexName() + "' is not an attribute field: Prefix matching is not supported");
if (field.get().isIndex()) // index overrides attribute
throw new IllegalArgumentException("'" + prefixItem.getIndexName() + "' is an index field: Prefix matching is not supported even when it is also an attribute");
}
return true;
}
}
}
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