/*
* 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 org.apache.jena.tdb.store.nodetupletable;
import java.util.Iterator ;
import org.apache.jena.atlas.lib.ArrayUtils ;
import org.apache.jena.atlas.lib.tuple.Tuple ;
import org.apache.jena.graph.Node ;
import org.apache.jena.tdb.store.NodeId ;
import org.apache.jena.tdb.store.tupletable.TupleTable ;
/** (Read-only?) projection of another NodeTupleTable.
* This will not reduce a N-wide tuple to N-1 when find*() used.
*/
public class NodeTupleTableView extends NodeTupleTableWrapper
{
private Node prefix ;
private NodeId prefixId ;
//private boolean readOnly = false ;
public NodeTupleTableView(NodeTupleTable ntt, Node prefix)
{
super(ntt) ;
this.prefix = prefix ;
this.prefixId = ntt.getNodeTable().getNodeIdForNode(prefix) ;
}
@Override
public boolean addRow(Node... nodes)
{
nodes = push(Node.class, prefix, nodes) ;
return super.addRow(nodes) ;
}
@Override
public boolean deleteRow(Node... nodes)
{
nodes = push(Node.class, prefix, nodes) ;
return super.deleteRow(nodes) ;
}
@Override
public Iterator<Tuple<Node>> find(Node... nodes)
{
nodes = push(Node.class, prefix, nodes) ;
return nodeTupleTable.find(nodes) ;
}
private static <T> T[] push(Class<T> cls, T x, T[] array)
{
T[] array2 = ArrayUtils.alloc(cls, array.length+1) ;
System.arraycopy(array, 0, array2, 1, array.length) ;
array2[0] = x ;
return array2 ;
}
private static <T> T[] push(Class<T> cls, T x, Tuple<T> tuple)
{
T[] array2 = ArrayUtils.alloc(cls, tuple.len()+1) ;
tuple.copyInto(array2, 1);
array2[0] = x ;
return array2 ;
}
@Override
public Iterator<Tuple<NodeId>> find(NodeId... ids)
{
ids = push(NodeId.class, prefixId, ids) ;
return nodeTupleTable.find(ids) ;
}
@Override
public Iterator<Tuple<NodeId>> find(Tuple<NodeId> ids)
{
NodeId[] ids2 = push(NodeId.class, prefixId, ids) ;
return nodeTupleTable.find(ids2) ;
}
@Override
public Iterator<Tuple<NodeId>> findAsNodeIds(Node... nodes)
{
nodes = push(Node.class, prefix, nodes) ;
return nodeTupleTable.findAsNodeIds(nodes) ;
}
// @Override
// public boolean isReadOnly() { return readOnly ; }
//
// @Override
// public void setReadOnly(boolean mode) { readOnly = mode ; }
@Override
public TupleTable getTupleTable()
// Need a projection of this?
{ return super.getTupleTable() ; }
}