Hbase过滤器（四）：FilterList API

FilterList：

用户可以提供多个过滤器共同限制返回到客户端的结果，与其他单一功能的过滤器一样，FilterList类实现了Filter接口，所以它可以通过组合多个过滤器的功能来实现某种效果，从而代替提供这类效果的过滤器。

方法类：

FilterList（List<Filter> rowFilters）

FilterList（Operator operator）

FilterList（Operator operator，List<Filter> rowFilters）

 

代码展示：

package filterList;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.filter.*;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class filterList {
    private Configuration configuration = null;
    private Connection connection = null;
    @Test
    public void filterList() throws IOException {
        System.out.println("begin");
        configuration = HBaseConfiguration.create();
        connection = ConnectionFactory.createConnection(configuration);
        Table table = connection.getTable(TableName.valueOf("ns1:t1"));
        List<Filter> filters = new ArrayList<Filter>();
        Filter filter1 = new RowFilter(CompareFilter.CompareOp.GREATER_OR_EQUAL,new BinaryComparator(Bytes.toBytes("row2")));
        filters.add(filter1);
        Filter filter2 = new RowFilter(CompareFilter.CompareOp.LESS_OR_EQUAL,new BinaryComparator(Bytes.toBytes("row3")));
        filters.add(filter2);
        Filter filter3 = new QualifierFilter(CompareFilter.CompareOp.EQUAL,new BinaryComparator(Bytes.toBytes("name")));
        filters.add(filter3);
        FilterList filterList = new FilterList(filters);
        Scan scan = new Scan();
        scan.setFilter(filterList);
        ResultScanner resultScanner = table.getScanner(scan);
        for(Result result:resultScanner){
            for (KeyValue kv : result.raw()) {
                System.out.println("KV: "+kv+",value: "+Bytes.toString(kv.getValue()));
            }
        }
        resultScanner.close();

        System.out.println("-------------------------------------------------");
        FilterList filterList1 = new FilterList(FilterList.Operator.MUST_PASS_ONE,filters);
        Scan scan1 = new Scan();
        scan1.setFilter(filterList1);
        ResultScanner resultScanner1 = table.getScanner(scan1);
        for(Result result1:resultScanner1){
            for (KeyValue kv : result1.raw()) {
                System.out.println("KV: "+kv+",value: "+Bytes.toString(kv.getValue()));
            }
        }
        resultScanner1.close();
        table.close();
        System.out.println("end");
    }
}

结果展示：