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.core.utils.Preconditions;
  
  public class ColumnValueWritable implements Writable {
      private ColumnValue columnValue = null;
  
      public ColumnValueWritable() {
      }
  
      public ColumnValueWritable(ColumnValue colVal) {
          Preconditions.checkNotNull(colVal, "The column value should not be null.");
          columnValue = colVal;
      }
  
      public ColumnValue getColumnValue() {
          return columnValue;
      }
  
      @Override public void write(DataOutput out) throws IOException {
          Preconditions.checkNotNull(columnValue, "columnValue should not be null.");
          out.writeByte(WritableConsts.COLUMN_VALUE);
          switch(columnValue.getType()) {
          case INTEGER: {
              out.writeByte(WritableConsts.DATATYPE_INT);
              out.writeLong(columnValue.asLong());
              break;
          }
          case STRING: {
              out.writeByte(WritableConsts.DATATYPE_STR);
              out.writeUTF(columnValue.asString());
              break;
          }
          case BINARY: {
              out.writeByte(WritableConsts.DATATYPE_BIN);
              byte[] v = columnValue.asBinary();
              out.writeInt(v.length);
              out.write(v);
              break;
          }
          case DOUBLE: {
              out.writeByte(WritableConsts.DATATYPE_DBL);
              out.writeDouble(columnValue.asDouble());
              break;
          }
          case BOOLEAN: {
              out.writeByte(WritableConsts.DATATYPE_BOOL);
              out.writeBoolean(columnValue.asBoolean());
              break;
          }
          default: {
              throw new IOException("unknown ColumnType");
          }
          }
      }
  
      @Override public void readFields(DataInput in) throws IOException {
          byte columnValueTag = in.readByte();
          if (columnValueTag != WritableConsts.COLUMN_VALUE) {
              throw new IOException("broken input stream");
          }
          byte type = in.readByte();
          if (type == WritableConsts.DATATYPE_INT) {
              long v = in.readLong();
              columnValue = ColumnValue.fromLong(v);
          } else if (type == WritableConsts.DATATYPE_STR) {
              String v = in.readUTF();
              columnValue = ColumnValue.fromString(v);
          } else if (type == WritableConsts.DATATYPE_BIN) {
              int len = in.readInt();
              byte[] v = new byte[len];
              in.readFully(v);
              columnValue = ColumnValue.fromBinary(v);
          } else if (type == WritableConsts.DATATYPE_DBL) {
              double v = in.readDouble();
              columnValue = ColumnValue.fromDouble(v);
          } else if (type == WritableConsts.DATATYPE_BOOL) {
              boolean v = in.readBoolean();
              columnValue = ColumnValue.fromBoolean(v);
          } else {
              throw new IOException("broken input stream");
          }
      }
  
      public static ColumnValueWritable read(DataInput in) throws IOException {
          ColumnValueWritable w = new ColumnValueWritable();
          w.readFields(in);
          return w;
      }
  }
  
  