/*
* Copyright © 2015 Cask Data, Inc.
*
* Licensed 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 co.cask.cdap.data2.increment.hbase11;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.filter.FilterBase;
import java.io.IOException;
/**
* Simple filter for increment columns that includes all cell values in a column with a "delta" prefix up to and
* including the first cell it finds that is not an increment. This allows the {@link IncrementHandler}
* coprocessor to return the correct value for an increment column by summing the last total sum plus all newer
* delta values.
*/
public class IncrementFilter extends FilterBase {
@Override
public ReturnCode filterKeyValue(Cell cell) throws IOException {
if (IncrementHandler.isIncrement(cell)) {
// all visible increments should be included until we get to a non-increment
return ReturnCode.INCLUDE;
} else {
// as soon as we find a KV to include we can move to the next column
return ReturnCode.INCLUDE_AND_NEXT_COL;
}
}
}