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IndexUpdateCursor.java
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IndexUpdateCursor.java
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/*
* Copyright (c) 2002-2019 "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.IOException;
import org.neo4j.index.internal.gbptree.Layout;
import org.neo4j.io.pagecache.PageCursor;
import org.neo4j.kernel.impl.api.index.UpdateMode;
import org.neo4j.kernel.impl.transaction.log.ReadAheadChannel;
import static org.neo4j.kernel.impl.index.schema.IndexUpdateStorage.STOP_TYPE;
public class IndexUpdateCursor<KEY, VALUE> implements BlockEntryCursor<KEY,VALUE>
{
private final ReadAheadChannel channel;
private final PageCursor cursor;
private final Layout<KEY,VALUE> layout;
// Fields for the last entry
private UpdateMode updateMode;
private KEY key1;
private KEY key2;
private VALUE value;
public IndexUpdateCursor( ReadAheadChannel channel, PageCursor cursor, Layout<KEY,VALUE> layout )
{
this.channel = channel;
this.cursor = cursor;
this.layout = layout;
this.key1 = layout.newKey();
this.key2 = layout.newKey();
this.value = layout.newValue();
}
@Override
public boolean next() throws IOException
{
byte updateModeType = cursor.getByte();
if ( updateModeType == STOP_TYPE )
{
return false;
}
updateMode = UpdateMode.MODES[updateModeType];
IndexUpdateEntry.read( cursor, layout, updateMode, key1, key2, value );
return true;
}
@Override
public KEY key()
{
return key1;
}
@Override
public VALUE value()
{
return value;
}
public KEY key2()
{
return key2;
}
public UpdateMode updateMode()
{
return updateMode;
}
@Override
public void close() throws IOException
{
cursor.close();
}
}