/*
* Copyright 2011-2013 the original author or authors.
*
* 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 com.navercorp.pinpoint.common.hbase;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.springframework.util.Assert;
import java.util.ArrayList;
import java.util.List;
/**
* Adapter encapsulating the RowMapper callback.
* copy : https://github.com/spring-projects/spring-hadoop 1.0.2
* @author Costin Leau
*/
class RowMapperResultsExtractor<T> implements ResultsExtractor<List<T>> {
private final RowMapper<T> rowMapper;
/**
* Create a new RowMapperResultSetExtractor.
*
* @param rowMapper the RowMapper which creates an object for each row
*/
public RowMapperResultsExtractor(RowMapper<T> rowMapper) {
Assert.notNull(rowMapper, "RowMapper is required");
this.rowMapper = rowMapper;
}
public List<T> extractData(ResultScanner results) throws Exception {
List<T> rs = new ArrayList<>();
int rowNum = 0;
for (Result result : results) {
rs.add(this.rowMapper.mapRow(result, rowNum++));
}
return rs;
}
}