package org.apache.lucene.index;

/**
 * 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.
 */

class ReadOnlySegmentReader extends SegmentReader {

  static void noWrite() {
    throw new UnsupportedOperationException("This IndexReader cannot make any changes to the index (it was opened with readOnly = true)");
  }
  
  @Override
  protected void acquireWriteLock() {
    noWrite();
  }

  // Not synchronized
  @Override
  public boolean isDeleted(int n) {
    return deletedDocs != null && deletedDocs.get(n);
  }
}