/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hp.hpl.jena.tdb.index.factories;
import com.hp.hpl.jena.tdb.base.block.BlockMgr ;
import com.hp.hpl.jena.tdb.base.block.BlockMgrFactory ;
import com.hp.hpl.jena.tdb.base.file.FileFactory ;
import com.hp.hpl.jena.tdb.base.file.FileSet ;
import com.hp.hpl.jena.tdb.base.file.PlainFile ;
import com.hp.hpl.jena.tdb.base.record.RecordFactory ;
import com.hp.hpl.jena.tdb.index.Index ;
import com.hp.hpl.jena.tdb.index.IndexFactory ;
import com.hp.hpl.jena.tdb.index.ext.ExtHash ;
import com.hp.hpl.jena.tdb.sys.Names ;
import com.hp.hpl.jena.tdb.sys.SystemTDB ;
/** Index factory for extendible hash tables.
* Only an index, not a range index
*/
public class IndexFactoryExtHash implements IndexFactory
{
private final int blockSize ;
public IndexFactoryExtHash()
{ this(SystemTDB.BlockSize) ; }
public IndexFactoryExtHash(int blockSize)
{
this.blockSize = blockSize ;
}
@Override
public Index createIndex(FileSet fileset, RecordFactory recordFactory)
{
String fnDictionary = fileset.filename(Names.extHashExt) ;
PlainFile dictionary = FileFactory.createPlainFileDisk(fnDictionary) ;
String fnBuckets = fileset.filename(Names.extHashBucketExt) ;
BlockMgr mgr = createBlockMgr(fnBuckets, blockSize) ;
ExtHash eHash = new ExtHash(dictionary, recordFactory, mgr) ;
return eHash ;
}
protected BlockMgr createBlockMgr(String filename, int blockSize)
{
return BlockMgrFactory.createFile(filename, blockSize,
SystemTDB.BlockReadCacheSize,
SystemTDB.BlockWriteCacheSize) ;
}
}