/*
* 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.core;
import org.apache.jena.sparql.ARQConstants ;
import org.apache.jena.sparql.util.Context ;
import org.apache.jena.sparql.util.Symbol ;
/** Allocate variables */
public class VarAlloc
{
private String baseMarker ;
private long counter = 0 ;
// Globals
// Try to avoid their use because of clashes/vry large allocated names.
//private static VarAlloc varAnonAllocator = new VarAlloc(ARQConstants.allocGlobalVarAnonMarker) ;
//public static VarAlloc getVarAnonAllocator() { return bNodeAllocator ; }
private static VarAlloc varAllocator = new VarAlloc(ARQConstants.allocGlobalVarMarker) ;
public static VarAlloc getVarAllocator() { return varAllocator ; }
public static VarAlloc get(Context context, Symbol name)
{
return (VarAlloc)context.get(name) ;
}
public VarAlloc(String baseMarker)
{
this.baseMarker = baseMarker ;
}
public Var allocVar()
{ return alloc(baseMarker, counter ++) ; }
static private Var alloc(String base, long number)
{ return Var.alloc(base+number) ; }
}