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GBPTreeBuilder.java
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GBPTreeBuilder.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.index.internal.gbptree;
import java.io.File;
import java.io.IOException;
import java.util.function.Consumer;
import org.neo4j.index.internal.gbptree.GBPTree.Monitor;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.io.pagecache.PageCursor;
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;
/**
* Convenient builder for a {@link GBPTree}. Either created using zero-argument constructor for maximum
* flexibility, or with constructor with arguments considered mandatory to be able to build a proper tree.
*
* @param <KEY> type of key in {@link GBPTree}
* @param <VALUE> type of value in {@link GBPTree}
*/
class GBPTreeBuilder<KEY,VALUE>
{
private PageCache pageCache;
private File file;
private int tentativeIndexPageSize;
private Monitor monitor = NO_MONITOR;
private Header.Reader headerReader = NO_HEADER_READER;
private Layout<KEY,VALUE> layout;
private Consumer<PageCursor> headerWriter = NO_HEADER_WRITER;
GBPTreeBuilder()
{
}
GBPTreeBuilder( PageCache pageCache, File file, Layout<KEY,VALUE> layout )
{
with( pageCache );
with( file );
with( layout );
}
GBPTreeBuilder<KEY,VALUE> with( Layout<KEY,VALUE> layout )
{
this.layout = layout;
return this;
}
GBPTreeBuilder<KEY,VALUE> with( File file )
{
this.file = file;
return this;
}
GBPTreeBuilder<KEY,VALUE> with( PageCache pageCache )
{
this.pageCache = pageCache;
return this;
}
GBPTreeBuilder<KEY,VALUE> withIndexPageSize( int tentativeIndexPageSize )
{
this.tentativeIndexPageSize = tentativeIndexPageSize;
return this;
}
GBPTreeBuilder<KEY,VALUE> with( GBPTree.Monitor monitor )
{
this.monitor = monitor;
return this;
}
GBPTreeBuilder<KEY,VALUE> with( Header.Reader headerReader )
{
this.headerReader = headerReader;
return this;
}
GBPTreeBuilder<KEY,VALUE> with( Consumer<PageCursor> headerWriter )
{
this.headerWriter = headerWriter;
return this;
}
GBPTree<KEY,VALUE> build() throws IOException
{
return new GBPTree<>( pageCache, file, layout, tentativeIndexPageSize, monitor, headerReader, headerWriter );
}
}