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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.
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/*
 * 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 .
 */
package org.neo4j.kernel.impl.api.index;

import java.nio.file.Path;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.internal.kernel.api.InternalIndexState;
import org.neo4j.internal.schema.IndexDescriptor;
import org.neo4j.kernel.api.exceptions.index.IndexPopulationFailedKernelException;
import org.neo4j.kernel.api.index.MinimalIndexAccessor;
import org.neo4j.kernel.api.index.TokenIndexReader;
import org.neo4j.kernel.api.index.ValueIndexReader;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
import org.neo4j.values.storable.Value;

import static org.neo4j.internal.helpers.collection.Iterators.emptyResourceIterator;

public class FailedIndexProxy extends AbstractSwallowingIndexProxy
{
    private final IndexProxyStrategy indexProxyStrategy;
    private final MinimalIndexAccessor minimalIndexAccessor;
    private final Log log;

    FailedIndexProxy( IndexProxyStrategy indexProxyStrategy,
            MinimalIndexAccessor minimalIndexAccessor,
            IndexPopulationFailure populationFailure,
            LogProvider logProvider )
    {
        super( indexProxyStrategy, populationFailure );
        this.indexProxyStrategy = indexProxyStrategy;
        this.minimalIndexAccessor = minimalIndexAccessor;
        this.log = logProvider.getLog( getClass() );
    }

    @Override
    public void start()
    {
        // nothing to start
    }

    @Override
    public void changeIdentity( IndexDescriptor descriptor )
    {
        indexProxyStrategy.changeIndexDescriptor( descriptor );
    }

    @Override
    public void drop()
    {
        indexProxyStrategy.removeStatisticsForIndex();
        String message = "FailedIndexProxy#drop index on " + indexProxyStrategy.getIndexUserDescription() + " dropped due to:\n" +
                     getPopulationFailure().asString();
        log.info( message );
        minimalIndexAccessor.drop();
    }

    @Override
    public InternalIndexState getState()
    {
        return InternalIndexState.FAILED;
    }

    @Override
    public boolean awaitStoreScanCompleted( long time, TimeUnit unit ) throws IndexPopulationFailedKernelException
    {
        throw failureCause();
    }

    private IndexPopulationFailedKernelException failureCause()
    {
        return getPopulationFailure().asIndexPopulationFailure( getDescriptor().schema(), indexProxyStrategy.getIndexUserDescription() );
    }

    @Override
    public void activate()
    {
        throw new UnsupportedOperationException( "Cannot activate a failed index." );
    }

    @Override
    public void validate() throws IndexPopulationFailedKernelException
    {
        throw failureCause();
    }

    @Override
    public void validateBeforeCommit( Value[] tuple, long entityId )
    {
    }

    @Override
    public ResourceIterator snapshotFiles()
    {
        return emptyResourceIterator();
    }

    @Override
    public Map indexConfig()
    {
        return minimalIndexAccessor.indexConfig();
    }

    @Override
    public ValueIndexReader newValueReader()
    {
        throw new UnsupportedOperationException( "Can not get a reader for an index in FAILED state" );
    }

    @Override
    public TokenIndexReader newTokenReader()
    {
        throw new UnsupportedOperationException( "Can not get a reader for an index in FAILED state" );
    }
}