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StringIndexProvider.java
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StringIndexProvider.java
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/*
* Copyright (c) 2002-2018 "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.kernel.impl.index.schema;
import java.io.File;
import java.io.IOException;
import org.neo4j.index.internal.gbptree.GBPTree;
import org.neo4j.index.internal.gbptree.Layout;
import org.neo4j.index.internal.gbptree.RecoveryCleanupWorkCollector;
import org.neo4j.internal.kernel.api.IndexCapability;
import org.neo4j.internal.kernel.api.IndexLimitation;
import org.neo4j.internal.kernel.api.IndexOrder;
import org.neo4j.internal.kernel.api.IndexValueCapability;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.kernel.api.index.IndexAccessor;
import org.neo4j.kernel.api.index.IndexDirectoryStructure;
import org.neo4j.kernel.api.index.IndexPopulator;
import org.neo4j.kernel.api.schema.index.SchemaIndexDescriptor;
import org.neo4j.kernel.impl.api.index.sampling.IndexSamplingConfig;
import org.neo4j.values.storable.ValueCategory;
/**
* Schema index provider for native indexes backed by e.g. {@link GBPTree}.
*/
public class StringIndexProvider extends NativeIndexProvider<StringSchemaKey,NativeSchemaValue>
{
public static final String KEY = "string";
static final IndexCapability CAPABILITY = new StringIndexCapability();
private static final Descriptor STRING_PROVIDER_DESCRIPTOR = new Descriptor( KEY, "1.0" );
public StringIndexProvider( PageCache pageCache, FileSystemAbstraction fs,
IndexDirectoryStructure.Factory directoryStructure, Monitor monitor, RecoveryCleanupWorkCollector recoveryCleanupWorkCollector,
boolean readOnly )
{
super( STRING_PROVIDER_DESCRIPTOR, 0, directoryStructure, pageCache, fs, monitor, recoveryCleanupWorkCollector, readOnly );
}
@Override
Layout<StringSchemaKey,NativeSchemaValue> layout( SchemaIndexDescriptor descriptor )
{
return new StringLayout();
}
@Override
protected IndexPopulator newIndexPopulator( File storeFile, Layout<StringSchemaKey,NativeSchemaValue> layout,
SchemaIndexDescriptor descriptor, long indexId,
IndexSamplingConfig samplingConfig )
{
return new StringSchemaIndexPopulator( pageCache, fs, storeFile, layout, monitor, descriptor, indexId, samplingConfig );
}
@Override
protected IndexAccessor newIndexAccessor( File storeFile, Layout<StringSchemaKey,NativeSchemaValue> layout, SchemaIndexDescriptor descriptor,
long indexId, IndexSamplingConfig samplingConfig ) throws IOException
{
return new StringSchemaIndexAccessor( pageCache, fs, storeFile, layout, recoveryCleanupWorkCollector, monitor, descriptor,
indexId, samplingConfig );
}
@Override
public IndexCapability getCapability( SchemaIndexDescriptor schemaIndexDescriptor )
{
return CAPABILITY;
}
/**
* For single property string queries capabilities are
* Order: ASCENDING
* Value: YES (can provide exact value)
*
* For other queries there is no support
*/
private static class StringIndexCapability implements IndexCapability
{
private final IndexLimitation[] limitations = {IndexLimitation.SLOW_CONTAINS};
@Override
public IndexOrder[] orderCapability( ValueCategory... valueCategories )
{
if ( support( valueCategories ) )
{
return ORDER_ASC;
}
return ORDER_NONE;
}
@Override
public IndexValueCapability valueCapability( ValueCategory... valueCategories )
{
if ( support( valueCategories ) )
{
return IndexValueCapability.YES;
}
if ( singleWildcard( valueCategories ) )
{
return IndexValueCapability.PARTIAL;
}
return IndexValueCapability.NO;
}
@Override
public IndexLimitation[] limitations()
{
return limitations;
}
private boolean support( ValueCategory[] valueCategories )
{
return valueCategories.length == 1 && valueCategories[0] == ValueCategory.TEXT;
}
}
}