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.ObjectInput;
  import java.io.ObjectOutput;
  import java.io.IOException;
  import java.io.Externalizable;
  
  import org.apache.hadoop.io.Writable;
  
  import com.alicloud.openservices.tablestore.model.Condition;
  import com.alicloud.openservices.tablestore.model.RowExistenceExpectation;
  import com.alicloud.openservices.tablestore.model.condition.ColumnCondition;
  import com.alicloud.openservices.tablestore.model.condition.CompositeColumnValueCondition;
  import com.alicloud.openservices.tablestore.model.condition.SingleColumnValueCondition;
  import com.alicloud.openservices.tablestore.model.filter.Filter;
  import com.alicloud.openservices.tablestore.model.filter.CompositeColumnValueFilter;
  import com.alicloud.openservices.tablestore.model.filter.SingleColumnValueFilter;
  import com.alicloud.openservices.tablestore.core.utils.Preconditions;
  
  public class ConditionWritable implements Writable, Externalizable {
      private Condition condition;
  
      public ConditionWritable() {
      }
  
      public ConditionWritable(Condition condition) {
          Preconditions.checkNotNull(condition, "condition must be nonnull.");
          this.condition = condition;
      }
  
      public Condition getCondition() {
          return condition;
      }
  
      @Override public void write(DataOutput out) throws IOException {
          out.writeByte(WritableConsts.CONDITION);
          switch(condition.getRowExistenceExpectation()) {
          case IGNORE: {
              out.writeByte(WritableConsts.ROW_CONDITION_IGNORE);
              break;
          }
          case EXPECT_EXIST: {
              out.writeByte(WritableConsts.ROW_CONDITION_EXPECT_EXIST);
              break;
          }
          case EXPECT_NOT_EXIST: {
              out.writeByte(WritableConsts.ROW_CONDITION_EXPECT_NOT_EXIST);
              break;
          }
          }
          ColumnCondition cc = condition.getColumnCondition();
          if (cc == null) {
              out.writeByte(WritableConsts.COLUMN_CONDITION_NONE);
          } else {
              out.writeByte(WritableConsts.COLUMN_CONDITION_PRESENT);
              switch(cc.getConditionType()) {
              case COMPOSITE_COLUMN_VALUE_CONDITION: {
                  new FilterWritable(((CompositeColumnValueCondition) cc).toFilter()).write(out);
                  break;
              }
              case SINGLE_COLUMN_VALUE_CONDITION: {
                  new FilterWritable(((SingleColumnValueCondition) cc).toFilter()).write(out);
                  break;
              }
              }
          }
  
      }
  
      @Override public void readFields(DataInput in) throws IOException {
          byte tagCondition = in.readByte();
          if (tagCondition != WritableConsts.CONDITION) {
              throw new IOException("broken input stream");
          }
  
          Condition condition = new Condition();
  
          byte tagRowCondition = in.readByte();
          if (tagRowCondition == WritableConsts.ROW_CONDITION_IGNORE) {
              condition.setRowExistenceExpectation(RowExistenceExpectation.IGNORE);
          } else if (tagRowCondition == WritableConsts.ROW_CONDITION_EXPECT_EXIST) {
              condition.setRowExistenceExpectation(RowExistenceExpectation.EXPECT_EXIST);
          } else if (tagRowCondition == WritableConsts.ROW_CONDITION_EXPECT_NOT_EXIST) {
              condition.setRowExistenceExpectation(RowExistenceExpectation.EXPECT_NOT_EXIST);
          } else {
              throw new IOException("broken input stream");
          }
  
          byte tagColCondition = in.readByte();
          if (tagColCondition == WritableConsts.COLUMN_CONDITION_NONE) {
              // intend to do nothing
          } else {
              Filter filter = FilterWritable.read(in).getFilter();
              condition.setColumnCondition(filterToColumnCondition(filter));
          }
  
          this.condition = condition;
      }
  
      public static ConditionWritable read(DataInput in) throws IOException {
          ConditionWritable w = new ConditionWritable();
          w.readFields(in);
          return w;
      }
  
      @Override public void readExternal(ObjectInput in)
          throws IOException, ClassNotFoundException {
          this.readFields(in);
      }
  
      @Override public void writeExternal(ObjectOutput out) throws IOException {
          this.write(out);
      }
  
      private ColumnCondition filterToColumnCondition(Filter filter) throws IOException {
          if (filter instanceof SingleColumnValueFilter) {
              return ((SingleColumnValueFilter) filter).toCondition();
          } else if (filter instanceof CompositeColumnValueFilter) {
              return ((CompositeColumnValueFilter) filter).toCondition();
          } else {
              throw new IOException("unknown filter type");
          }
      }
  }
  
  