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NativeSchemaNumberIndex.java
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NativeSchemaNumberIndex.java
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/*
* Copyright (c) 2002-2017 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.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.Closeable;
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.io.pagecache.PageCache;
import static org.neo4j.index.internal.gbptree.GBPTree.NO_HEADER_READER;
import static org.neo4j.index.internal.gbptree.GBPTree.NO_HEADER_WRITER;
import static org.neo4j.index.internal.gbptree.GBPTree.NO_MONITOR;
class NativeSchemaNumberIndex<KEY extends SchemaNumberKey, VALUE extends SchemaNumberValue>
{
final PageCache pageCache;
final File storeFile;
final Layout<KEY,VALUE> layout;
GBPTree<KEY,VALUE> tree;
NativeSchemaNumberIndex( PageCache pageCache, File storeFile, Layout<KEY,VALUE> layout )
{
this.pageCache = pageCache;
this.storeFile = storeFile;
this.layout = layout;
}
void instantiateTree( RecoveryCleanupWorkCollector recoveryCleanupWorkCollector ) throws IOException
{
tree = new GBPTree<>( pageCache, storeFile, layout, 0, NO_MONITOR, NO_HEADER_READER, NO_HEADER_WRITER,
recoveryCleanupWorkCollector );
}
void closeTree() throws IOException
{
tree = closeIfPresent( tree );
}
<T extends Closeable> T closeIfPresent( T closeable ) throws IOException
{
if ( closeable != null )
{
closeable.close();
}
return null;
}
void assertOpen()
{
if ( tree == null )
{
throw new IllegalStateException( "Index has been closed" );
}
}
}