package org.apache.lucene.codecs.lucene3x;

/*
 * 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.
 */

import java.io.IOException;

import org.apache.lucene.codecs.FieldInfosFormat;
import org.apache.lucene.codecs.FieldInfosReader;
import org.apache.lucene.codecs.FieldInfosWriter;

/**
 * Lucene3x ReadOnly FieldInfosFromat implementation
 * @deprecated (4.0) This is only used to read indexes created
 * before 4.0.
 * @lucene.experimental
 */
@Deprecated
class Lucene3xFieldInfosFormat extends FieldInfosFormat {
  private final FieldInfosReader reader = new Lucene3xFieldInfosReader();
  
  @Override
  public FieldInfosReader getFieldInfosReader() throws IOException {
    return reader;
  }

  @Override
  public FieldInfosWriter getFieldInfosWriter() throws IOException {
    throw new UnsupportedOperationException("this codec can only be used for reading");
  }
}
