/*
 * 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.phoenix.mapreduce.index;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.mapreduce.lib.db.DBWritable;
import org.apache.phoenix.jdbc.PhoenixResultSet;
import org.apache.phoenix.schema.SortOrder;
import org.apache.phoenix.schema.tuple.Tuple;
import org.apache.phoenix.schema.types.PLong;

/**
 * A {@link DBWritable} class that reads the number of rows that have been built.
 */
public class PhoenixServerBuildIndexDBWritable implements DBWritable {
  private long rowCount;

  @Override
  public void write(PreparedStatement statement) throws SQLException {
    throw new SQLFeatureNotSupportedException();
  }

  @Override
  public void readFields(ResultSet resultSet) throws SQLException {
    Tuple row = resultSet.unwrap(PhoenixResultSet.class).getCurrentRow();
    Cell kv = row.getValue(0);
    ImmutableBytesWritable tmpPtr =
      new ImmutableBytesWritable(kv.getValueArray(), kv.getValueOffset(), kv.getValueLength());
    // A single Cell will be returned with the count(*) - we decode that here
    rowCount = PLong.INSTANCE.getCodec().decodeLong(tmpPtr, SortOrder.getDefault());
  }

  public long getRowCount() {
    return rowCount;
  }

}
