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TxSingleNodeCursor.java
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TxSingleNodeCursor.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.api.cursor;
import java.util.function.Consumer;
import org.neo4j.collection.primitive.PrimitiveIntSet;
import org.neo4j.cursor.Cursor;
import org.neo4j.kernel.api.StatementConstants;
import org.neo4j.kernel.api.cursor.EntityItemHelper;
import org.neo4j.kernel.api.txstate.TransactionState;
import org.neo4j.storageengine.api.Direction;
import org.neo4j.storageengine.api.NodeItem;
import org.neo4j.storageengine.api.PropertyItem;
import org.neo4j.storageengine.api.RelationshipItem;
import org.neo4j.storageengine.api.txstate.NodeState;
import static org.neo4j.collection.primitive.Primitive.intSet;
import static org.neo4j.kernel.impl.store.record.Record.NO_NEXT_RELATIONSHIP;
import static org.neo4j.kernel.impl.util.Cursors.empty;
/**
* Overlays transaction state on a {@link NodeItem} cursor.
*/
public class TxSingleNodeCursor extends EntityItemHelper implements Cursor<NodeItem>, NodeItem
{
private final TransactionState state;
private final Consumer<TxSingleNodeCursor> cache;
private long id = StatementConstants.NO_SUCH_NODE;
private Cursor<NodeItem> cursor;
private NodeState nodeState;
private boolean nodeIsAddedInThisTx;
public TxSingleNodeCursor( TransactionState state, Consumer<TxSingleNodeCursor> cache )
{
this.state = state;
this.cache = cache;
}
public TxSingleNodeCursor init( Cursor<NodeItem> nodeCursor, long nodeId )
{
this.id = nodeId;
this.cursor = nodeCursor;
this.nodeIsAddedInThisTx = state.nodeIsAddedInThisTx( id );
return this;
}
@Override
public NodeItem get()
{
if ( id == StatementConstants.NO_SUCH_NODE )
{
throw new IllegalStateException();
}
return this;
}
@Override
public boolean next()
{
if ( id == StatementConstants.NO_SUCH_NODE )
{
return false;
}
if ( state.nodeIsDeletedInThisTx( id ) )
{
this.id = StatementConstants.NO_SUCH_NODE;
return false;
}
if ( cursor.next() || nodeIsAddedInThisTx )
{
// this makes sure we read the node from tx state only once and we do not loop forever
nodeIsAddedInThisTx = false;
this.nodeState = state.getNodeState( id );
return true;
}
else
{
this.id = StatementConstants.NO_SUCH_NODE;
this.nodeState = null;
return false;
}
}
@Override
public void close()
{
cursor.close();
cursor = null;
cache.accept( this );
}
@Override
public long id()
{
return id;
}
@Override
public PrimitiveIntSet labels()
{
return state.augmentLabels( nodeIsAddedInThisTx ? intSet() : this.cursor.get().labels(), nodeState );
}
@Override
public boolean hasLabel( int labelId )
{
if ( nodeIsAddedInThisTx || nodeState.labelDiffSets().getRemoved().contains( labelId ) )
{
return false;
}
if ( nodeState.labelDiffSets().getAdded().contains( labelId ) )
{
return true;
}
return this.cursor.get().hasLabel( labelId );
}
@Override
public Cursor<PropertyItem> properties()
{
return state.augmentPropertyCursor( nodeIsAddedInThisTx ? empty() : cursor.get().properties(), nodeState );
}
@Override
public Cursor<PropertyItem> property( int propertyKeyId )
{
Cursor<PropertyItem> cursor = nodeIsAddedInThisTx ? empty() : this.cursor.get().property( propertyKeyId );
return state.augmentSinglePropertyCursor( cursor, nodeState, propertyKeyId );
}
@Override
public Cursor<RelationshipItem> relationships( Direction direction, int... relTypes )
{
Cursor<RelationshipItem> cursor =
nodeIsAddedInThisTx ? empty() : this.cursor.get().relationships( direction, relTypes );
return state.augmentNodeRelationshipCursor( cursor, nodeState, direction, relTypes );
}
@Override
public Cursor<RelationshipItem> relationships( Direction direction )
{
Cursor<RelationshipItem> cursor = nodeIsAddedInThisTx ? empty() : this.cursor.get().relationships( direction );
return state.augmentNodeRelationshipCursor( cursor, nodeState, direction, null );
}
@Override
public boolean isDense()
{
return cursor.get().isDense();
}
@Override
public long nextGroupId()
{
return nodeIsAddedInThisTx ? NO_NEXT_RELATIONSHIP.longValue() : cursor.get().nextGroupId();
}
}