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// Copyright Yahoo. 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.Index;
import com.yahoo.prelude.IndexFacts;
import com.yahoo.prelude.query.CompositeItem;
import com.yahoo.prelude.query.HasIndexItem;
import com.yahoo.prelude.query.Item;
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.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) {
IndexFacts.Session session = execution.context().getIndexFacts().newSession(query);
ToolBox.visit(new ItemValidator(session), query.getModel().getQueryTree().getRoot());
return execution.search(query);
}
private static class ItemValidator extends ToolBox.QueryVisitor {
IndexFacts.Session session;
public ItemValidator(IndexFacts.Session session) {
this.session = session;
}
@Override
public boolean visit(Item item) {
if (item instanceof HasIndexItem) {
String indexName = ((HasIndexItem)item).getIndexName();
if (session.getIndex(indexName).isTensor())
throw new IllegalArgumentException("Cannot search '" + indexName + "': It is a tensor field");
}
return true;
}
@Override
public void onExit() { }
}
}
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