/*
 * 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.jackrabbit.oak.segment;

import java.util.Iterator;

import org.jetbrains.annotations.NotNull;

/**
 * An implementation of {@link SegmentReferences} that throws {@link
 * IllegalStateException}s every time it's used. This instance is used in
 * context where accessing a {@link SegmentReferences} is considered a
 * programmer's error.
 */
class IllegalSegmentReferences implements SegmentReferences {

    @Override
    public SegmentId getSegmentId(int reference) {
        throw new IllegalStateException("invalid use");
    }

    @NotNull
    @Override
    public Iterator<SegmentId> iterator() {
        throw new IllegalStateException("invalid use");
    }

}
