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
   *
   * 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 com.aliyun.openservices.tablestore.hadoop;
  
  import java.io.DataInput;
  import java.io.DataOutput;
  import java.io.IOException;
  import org.apache.hadoop.io.Writable;
  import com.alicloud.openservices.tablestore.model.ColumnValue;
  import com.alicloud.openservices.tablestore.model.Column;
  import com.alicloud.openservices.tablestore.core.utils.Preconditions;
  
  public class ColumnWritable implements Writable {
      private Column column = null;
  
      public ColumnWritable() {
      }
  
      public ColumnWritable(Column col) {
          Preconditions.checkNotNull(col, "The column should not be null.");
          column = col;
      }
  
      public Column getColumn() {
          return column;
      }
  
      @Override public void write(DataOutput out) throws IOException {
          Preconditions.checkNotNull(column, "column should not be null.");
          if (column.hasSetTimestamp()) {
              out.writeByte(WritableConsts.COLUMN_WITH_TIMESTAMP);
          } else {
              out.writeByte(WritableConsts.COLUMN_WITHOUT_TIMESTAMP);
          }
          out.writeUTF(column.getName());
          new ColumnValueWritable(column.getValue()).write(out);
          if (column.hasSetTimestamp()) {
              out.writeLong(column.getTimestamp());
          }
      }
  
      @Override public void readFields(DataInput in) throws IOException {
          byte tagColumn = in.readByte();
          if (tagColumn == WritableConsts.COLUMN_WITHOUT_TIMESTAMP) {
              String name = in.readUTF();
              ColumnValue val = ColumnValueWritable.read(in).getColumnValue();
              column = new Column(name, val);
          } else if (tagColumn == WritableConsts.COLUMN_WITH_TIMESTAMP) {
              String name = in.readUTF();
              ColumnValue val = ColumnValueWritable.read(in).getColumnValue();
              long ts = in.readLong();
              column = new Column(name, val, ts);
          } else {
              throw new IOException("broken input stream");
          }
      }
  
      public static ColumnWritable read(DataInput in) throws IOException {
          ColumnWritable w = new ColumnWritable();
          w.readFields(in);
          return w;
      }
  }
  
  