jp.co.yahoo.yosegi.spread.analyzer.BytesColumnAnalizer Maven / Gradle / Ivy

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/**
 * 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 jp.co.yahoo.yosegi.spread.analyzer;

import jp.co.yahoo.yosegi.spread.column.ColumnType;
import jp.co.yahoo.yosegi.spread.column.ICell;
import jp.co.yahoo.yosegi.spread.column.IColumn;
import jp.co.yahoo.yosegi.spread.column.PrimitiveCell;

import java.io.IOException;

public class BytesColumnAnalizer implements IColumnAnalizer {

  private final IColumn column;

  public BytesColumnAnalizer( final IColumn column ) {
    this.column = column;
  }

  @Override
  public IColumnAnalizeResult analize() throws IOException {
    boolean maybeSorted = false;
    int nullCount = 0;
    int rowCount = 0;
    int totalLogicalDataSize = 0;
    int minBytes = Integer.MAX_VALUE;
    int maxBytes = 0;

    for ( int i = 0 ; i < column.size() ; i++ ) {
      ICell cell = column.get(i);
      if ( cell.getType() == ColumnType.NULL ) {
        nullCount++;
        continue;
      }
      byte[] target = ( (PrimitiveCell) cell ).getRow().getBytes();
      if ( target == null ) {
        nullCount++;
        continue;
      }
      rowCount++;
      totalLogicalDataSize += target.length;
      if ( target.length < minBytes ) {
        minBytes = target.length;
      }
      if ( maxBytes < target.length ) {
        maxBytes = target.length;
      }
    }

    int uniqCount = rowCount;

    return new BytesColumnAnalizeResult(
        column.getColumnName() ,
        column.size() ,
        maybeSorted ,
        nullCount ,
        rowCount ,
        uniqCount ,
        totalLogicalDataSize ,
        minBytes ,
        maxBytes );
  }

}