/*
* 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.sparql.engine.binding;
import java.util.Iterator ;
import org.apache.jena.atlas.iterator.Iter ;
import org.apache.jena.graph.Node ;
import org.apache.jena.sparql.core.Var ;
/** Special purpose binding for adding just one name/value slot. */
public class Binding1 extends BindingBase
{
private final Var var ;
private final Node value ;
/*package*/ Binding1(Binding parent, Var _var, Node _node)
{
super(parent) ;
var = _var ;
value = _node ;
}
@Override
protected int size1() { return 1 ; }
@Override
protected boolean isEmpty1() { return false ; }
/** Iterate over all the names of variables.
*/
@Override
public Iterator<Var> vars1()
{
return Iter.singleton(var) ;
}
@Override
public boolean contains1(Var n)
{
return var.equals(n) ;
}
@Override
public Node get1(Var v)
{
if ( v.equals(var) )
return value ;
return null ;
}
}