| /* |
| * 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/very 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) ; } |
| |
| } |