/*
 * 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
 *
 *   https://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.
 *
 *   SPDX-License-Identifier: Apache-2.0
 */

package org.apache.jena.core_ttl.parser;

import java.util.HashMap;
import java.util.Map;

import org.apache.jena.graph.Node;
import org.apache.jena.graph.NodeFactory;

/** Map from _:* form to bNodes
 */

public class LabelToNodeMap
{
    Map<String, Node> bNodeLabels = new HashMap<>();
    
    public LabelToNodeMap()
    {}

    public Node asNode(String label)
    {
        Node n = bNodeLabels.get(label);
        if ( n != null )
            return n;
        n = allocNode();
        bNodeLabels.put(label, n);
        return n;
    }
    
    public Node allocNode()
    {
        return NodeFactory.createBlankNode();
    }
    
    public void clear()
    {
        bNodeLabels.clear();
    }
}
