/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.consistency.checking;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.neo4j.consistency.checking.index.IndexAccessors;
import org.neo4j.internal.kernel.api.InternalIndexState;
import org.neo4j.internal.kernel.api.exceptions.schema.IndexNotFoundKernelException;
import org.neo4j.internal.schema.IndexDescriptor;
import org.neo4j.kernel.api.index.IndexAccessor;
import org.neo4j.kernel.impl.api.index.AbstractDelegatingIndexProxy;
import org.neo4j.kernel.impl.api.index.IndexProxy;
import org.neo4j.kernel.impl.api.index.IndexingService;
import org.neo4j.kernel.impl.api.index.OnlineIndexProxy;

public class LookupAccessorsFromRunningDb implements IndexAccessors.IndexAccessorLookup {
    private final IndexingService indexingService;

    public LookupAccessorsFromRunningDb(IndexingService indexingService) {
        this.indexingService = indexingService;
    }

    @Override
    public IndexAccessor apply(IndexDescriptor indexDescriptor) {
        try {
            IndexProxy proxy = indexingService.getIndexProxy(indexDescriptor);
            while (proxy instanceof AbstractDelegatingIndexProxy) {
                proxy = ((AbstractDelegatingIndexProxy) proxy).getDelegate();
            }
            assertEquals(InternalIndexState.ONLINE, proxy.getState());
            return ((OnlineIndexProxy) proxy).accessor();
        } catch (IndexNotFoundKernelException e) {
            throw new RuntimeException(e);
        }
    }
}
