content: /*
   * 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.
   */
  package org.apache.trevni;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  /** Interface for compression codecs. */
  abstract class Codec {
  
    public static Codec get(MetaData meta) {
      String name = meta.getCodec();
      if (name == null || "null".equals(name))
        return new NullCodec();
      else if ("deflate".equals(name))
        return new DeflateCodec();
      else if ("snappy".equals(name))
        return new SnappyCodec();
      else if ("bzip2".equals(name))
        return new BZip2Codec();
      else
        throw new TrevniRuntimeException("Unknown codec: " + name);
    }
  
    /** Compress data */
    abstract ByteBuffer compress(ByteBuffer uncompressedData) throws IOException;
  
    /** Decompress data */
    abstract ByteBuffer decompress(ByteBuffer compressedData) throws IOException;
  
    // Codecs often reference the array inside a ByteBuffer. Compute the offset
    // to the start of data correctly in the case that our ByteBuffer
    // is a slice() of another.
    protected static int computeOffset(ByteBuffer data) {
      return data.arrayOffset() + data.position();
    }
  }
  