/**
    * 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.thrift;
  
  import static org.apache.hadoop.hbase.util.Bytes.getBytes;
  
  import java.nio.ByteBuffer;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.TreeMap;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.Cell;
  import org.apache.hadoop.hbase.CellUtil;
  import org.apache.hadoop.hbase.HColumnDescriptor;
  import org.apache.hadoop.hbase.KeyValue;
  import org.apache.hadoop.hbase.client.Append;
  import org.apache.hadoop.hbase.client.Increment;
  import org.apache.hadoop.hbase.client.Result;
  import org.apache.hadoop.hbase.io.compress.Compression;
  import org.apache.hadoop.hbase.regionserver.BloomType;
  import org.apache.hadoop.hbase.thrift.generated.ColumnDescriptor;
  import org.apache.hadoop.hbase.thrift.generated.IllegalArgument;
  import org.apache.hadoop.hbase.thrift.generated.TAppend;
  import org.apache.hadoop.hbase.thrift.generated.TCell;
  import org.apache.hadoop.hbase.thrift.generated.TColumn;
  import org.apache.hadoop.hbase.thrift.generated.TIncrement;
  import org.apache.hadoop.hbase.thrift.generated.TRowResult;
  import org.apache.hadoop.hbase.util.Bytes;
  
  @InterfaceAudience.Private
  public class ThriftUtilities {
  
    /**
     * This utility method creates a new Hbase HColumnDescriptor object based on a
     * Thrift ColumnDescriptor "struct".
     *
     * @param in
     *          Thrift ColumnDescriptor object
     * @return HColumnDescriptor
     * @throws IllegalArgument
     */
    static public HColumnDescriptor colDescFromThrift(ColumnDescriptor in)
        throws IllegalArgument {
      Compression.Algorithm comp =
        Compression.getCompressionAlgorithmByName(in.compression.toLowerCase());
      BloomType bt =
        BloomType.valueOf(in.bloomFilterType);
  
      if (in.name == null || !in.name.hasRemaining()) {
        throw new IllegalArgument("column name is empty");
      }
      byte [] parsedName = KeyValue.parseColumn(Bytes.getBytes(in.name))[0];
      HColumnDescriptor col = new HColumnDescriptor(parsedName)
          .setMaxVersions(in.maxVersions)
          .setCompressionType(comp)
          .setInMemory(in.inMemory)
          .setBlockCacheEnabled(in.blockCacheEnabled)
          .setTimeToLive(in.timeToLive > 0 ? in.timeToLive : Integer.MAX_VALUE)
          .setBloomFilterType(bt);
      return col;
    }
  
    /**
     * This utility method creates a new Thrift ColumnDescriptor "struct" based on
     * an Hbase HColumnDescriptor object.
     *
     * @param in
     *          Hbase HColumnDescriptor object
     * @return Thrift ColumnDescriptor
     */
    static public ColumnDescriptor colDescFromHbase(HColumnDescriptor in) {
      ColumnDescriptor col = new ColumnDescriptor();
      col.name = ByteBuffer.wrap(Bytes.add(in.getName(), KeyValue.COLUMN_FAMILY_DELIM_ARRAY));
      col.maxVersions = in.getMaxVersions();
      col.compression = in.getCompression().toString();
      col.inMemory = in.isInMemory();
      col.blockCacheEnabled = in.isBlockCacheEnabled();
      col.bloomFilterType = in.getBloomFilterType().toString();
      return col;
    }
  
    /**
    * This utility method creates a list of Thrift TCell "struct" based on
    * an Hbase Cell object. The empty list is returned if the input is null.
    *
    * @param in
    *          Hbase Cell object
    * @return Thrift TCell array
    */
   static public List<TCell> cellFromHBase(Cell in) {
     List<TCell> list = new ArrayList<TCell>(1);
     if (in != null) {
       list.add(new TCell(ByteBuffer.wrap(CellUtil.cloneValue(in)), in.getTimestamp()));
     }
     return list;
   }
 
   /**
    * This utility method creates a list of Thrift TCell "struct" based on
    * an Hbase Cell array. The empty list is returned if the input is null.
    * @param in Hbase Cell array
    * @return Thrift TCell array
    */
   static public List<TCell> cellFromHBase(Cell[] in) {
     List<TCell> list = null;
     if (in != null) {
       list = new ArrayList<TCell>(in.length);
       for (int i = 0; i < in.length; i++) {
         list.add(new TCell(ByteBuffer.wrap(CellUtil.cloneValue(in[i])), in[i].getTimestamp()));
       }
     } else {
       list = new ArrayList<TCell>(0);
     }
     return list;
   }
 
   /**
    * This utility method creates a list of Thrift TRowResult "struct" based on
    * an Hbase RowResult object. The empty list is returned if the input is
    * null.
    *
    * @param in
    *          Hbase RowResult object
    * @param sortColumns
    *          This boolean dictates if row data is returned in a sorted order
    *          sortColumns = True will set TRowResult's sortedColumns member
    *                        which is an ArrayList of TColumn struct
    *          sortColumns = False will set TRowResult's columns member which is
    *                        a map of columnName and TCell struct
    * @return Thrift TRowResult array
    */
   static public List<TRowResult> rowResultFromHBase(Result[] in, boolean sortColumns) {
     List<TRowResult> results = new ArrayList<TRowResult>();
     for ( Result result_ : in) {
         if(result_ == null || result_.isEmpty()) {
             continue;
         }
         TRowResult result = new TRowResult();
         result.row = ByteBuffer.wrap(result_.getRow());
         if (sortColumns) {
           result.sortedColumns = new ArrayList<TColumn>();
           for (Cell kv : result_.rawCells()) {
             result.sortedColumns.add(new TColumn(
                 ByteBuffer.wrap(KeyValue.makeColumn(CellUtil.cloneFamily(kv),
                     CellUtil.cloneQualifier(kv))),
                 new TCell(ByteBuffer.wrap(CellUtil.cloneValue(kv)), kv.getTimestamp())));
           }
         } else {
           result.columns = new TreeMap<ByteBuffer, TCell>();
           for (Cell kv : result_.rawCells()) {
             result.columns.put(
                 ByteBuffer.wrap(KeyValue.makeColumn(CellUtil.cloneFamily(kv),
                     CellUtil.cloneQualifier(kv))),
                 new TCell(ByteBuffer.wrap(CellUtil.cloneValue(kv)), kv.getTimestamp()));
           }
         }
       results.add(result);
     }
     return results;
   }
 
   /**
    * This utility method creates a list of Thrift TRowResult "struct" based on
    * an array of Hbase RowResult objects. The empty list is returned if the input is
    * null.
    *
    * @param in
    *          Array of Hbase RowResult objects
    * @return Thrift TRowResult array
    */
   static public List<TRowResult> rowResultFromHBase(Result[] in) {
     return rowResultFromHBase(in, false);
   }
 
   static public List<TRowResult> rowResultFromHBase(Result in) {
     Result [] result = { in };
     return rowResultFromHBase(result);
   }
 
   /**
    * From a {@link TIncrement} create an {@link Increment}.
    * @param tincrement the Thrift version of an increment
    * @return an increment that the {@link TIncrement} represented.
    */
   public static Increment incrementFromThrift(TIncrement tincrement) {
     Increment inc = new Increment(tincrement.getRow());
     byte[][] famAndQf = KeyValue.parseColumn(tincrement.getColumn());
     if (famAndQf.length != 2) return null;
     inc.addColumn(famAndQf[0], famAndQf[1], tincrement.getAmmount());
     return inc;
   }
 
   /**
    * From a {@link TAppend} create an {@link Append}.
    * @param tappend the Thrift version of an append.
    * @return an increment that the {@link TAppend} represented.
    */
   public static Append appendFromThrift(TAppend tappend) {
     Append append = new Append(tappend.getRow());
     List<ByteBuffer> columns = tappend.getColumns();
     List<ByteBuffer> values = tappend.getValues();
 
     if (columns.size() != values.size()) {
       throw new IllegalArgumentException(
           "Sizes of columns and values in tappend object are not matching");
     }
 
     int length = columns.size();
 
     for (int i = 0; i < length; i++) {
       byte[][] famAndQf = KeyValue.parseColumn(getBytes(columns.get(i)));
       append.add(famAndQf[0], famAndQf[1], getBytes(values.get(i)));
     }
     return append;
   }
 }