jena-arq/src/main/java/org/apache/jena/sparql/graph/PrefixMappingZero.java

/*
 * 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.graph;

import org.apache.jena.shared.PrefixMapping;

/** Immutable empty {@link PrefixMapping}. */
public class PrefixMappingZero extends PrefixMappingSink {

    @Override
    protected void add(String prefix, String uri) {
        throw new UnsupportedOperationException("add prefix");
    }

    @Override
    protected void remove(String prefix) {
        throw new UnsupportedOperationException("remove prefix");
    }

    @Override
    public String toString() {
        return "pm:Zero";
    }
}