/*
    * 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.hadoop.hbase.io.encoding;
  
  import java.io.IOException;
  
  import org.apache.hadoop.hbase.KeyValue.KVComparator;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.io.hfile.BlockType;
  import org.apache.hadoop.hbase.io.hfile.HFileContext;
  
  @InterfaceAudience.Private
  public abstract class AbstractDataBlockEncoder implements DataBlockEncoder {
  
    @Override
    public HFileBlockEncodingContext newDataBlockEncodingContext(
        DataBlockEncoding encoding, byte[] header, HFileContext meta) {
      return new HFileBlockDefaultEncodingContext(encoding, header, meta);
    }
  
    @Override
    public HFileBlockDecodingContext newDataBlockDecodingContext(HFileContext meta) {
      return new HFileBlockDefaultDecodingContext(meta);
    }
  
    protected void postEncoding(HFileBlockEncodingContext encodingCtx)
        throws IOException {
      if (encodingCtx.getDataBlockEncoding() != DataBlockEncoding.NONE) {
        encodingCtx.postEncoding(BlockType.ENCODED_DATA);
      } else {
        encodingCtx.postEncoding(BlockType.DATA);
      }
    }
  
    protected abstract static class AbstractEncodedSeeker implements
        EncodedSeeker {
      protected HFileBlockDecodingContext decodingCtx;
      protected final KVComparator comparator;
  
      public AbstractEncodedSeeker(KVComparator comparator,
          HFileBlockDecodingContext decodingCtx) {
        this.comparator = comparator;
        this.decodingCtx = decodingCtx;
      }
  
      protected boolean includesMvcc() {
        return this.decodingCtx.getHFileContext().isIncludesMvcc();
      }
  
      protected boolean includesTags() {
        return this.decodingCtx.getHFileContext().isIncludesTags();
      }
    }
  
  }