Examples of org.apache.hadoop.hbase.filter.Filter

org.apache.hadoop.hbase.filter.Filter
Interface for row and column filters directly applied within the regionserver. A filter can expect the following call sequence:
- {@link #reset()}
- {@link #filterAllRemaining()} -> true indicates scan is over, false, keep going on.
- {@link #filterRowKey(byte[],int,int)} -> true to drop this row,if false, we will also call
- {@link #filterKeyValue(KeyValue)} -> true to drop this key/value
- {@link #filterRow(List)} -> allows directmodification of the final list to be submitted
- {@link #filterRow()} -> last chance to drop entire row based on the sequence offilterValue() calls. Eg: filter a row if it doesn't contain a specified column.
Filter instances are created one per region/scan. This interface replaces the old RowFilterInterface. When implementing your own filters, consider inheriting {@link FilterBase} to helpyou reduce boilerplate. @see FilterBase

    SplitLogTask sltDeserialized = SplitLogTask.parseFrom(bytes);
    assertTrue(slt.equals(sltDeserialized));
  }


  @Test public void testCompareFilter() throws Exception {
    Filter f = new RowFilter(CompareOp.EQUAL,
      new BinaryComparator(Bytes.toBytes("testRowOne-2")));
    byte [] bytes = f.toByteArray();
    Filter ff = RowFilter.parseFrom(bytes);
    assertNotNull(ff);
  }

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      final String name = "testScan";
      byte [] prefix = Bytes.toBytes(name);
      scan.setFilter(new PrefixFilter(prefix));
      scanProto = ProtobufUtil.toScan(scan);
      desScan = ProtobufUtil.toScan(scanProto);
      Filter f = desScan.getFilter();
      assertTrue(f instanceof PrefixFilter);
    }


    assertEquals(scan.getMaxVersions(), desScan.getMaxVersions());
    TimeRange tr = scan.getTimeRange();

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      switch(qcode) {
        case INCLUDE:
        case INCLUDE_AND_SEEK_NEXT_ROW:
        case INCLUDE_AND_SEEK_NEXT_COL:


          Filter f = matcher.getFilter();
          if (f != null) {
            // TODO convert Scan Query Matcher to be Cell instead of KV based ?
            kv = KeyValueUtil.ensureKeyValue(f.transformCell(kv));
          }


          this.countPerRow++;
          if (storeLimit > -1 &&
              this.countPerRow > (storeLimit + storeOffset)) {

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      // Check two things:
      // 1. result list contains expected values
      // 2. result list is sorted properly


      Scan scan = new Scan();
      Filter filter = new SingleColumnValueExcludeFilter(cf_essential, col_normal,
          CompareOp.NOT_EQUAL, filtered_val);
      scan.setFilter(filter);
      scan.setLoadColumnFamiliesOnDemand(true);
      InternalScanner s = region.getScanner(scan);

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        region.put(put);
      }


      Scan scan = new Scan();
      scan.setLoadColumnFamiliesOnDemand(true);
      Filter bogusFilter = new FilterBase() {
        @Override
        public boolean isFamilyEssential(byte[] name) {
          return Bytes.equals(name, cf_first);
        }
      };

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          LOG.error("Can't find class " + className, e);
          throw new DoNotRetryIOException("Can't find class " + className, e);
        }
      }
    }
    Filter filter = (Filter)WritableFactories.newInstance(
      (Class<? extends Filter>)instanceClass, conf);
    try {
      filter.readFields(in);
    } catch (IOException io) {
      LOG.error("Error in readFields", io);
      throw io;
    } catch (Exception e) {
      LOG.error("Error in readFields", e);

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    HServerLoad hsl = (HServerLoad)Writables.getWritable(hsl092bytes, new HServerLoad());
    // TO BE CONTINUED
  }


  @Test public void testCompareFilter() throws Exception {
    Filter f = new RowFilter(CompareOp.EQUAL,
      new BinaryComparator(Bytes.toBytes("testRowOne-2")));
    byte [] bytes = Writables.getBytes(f);
    Filter ff = (Filter)Writables.getWritable(bytes, new RowFilter());
    assertNotNull(ff);
  }

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      final String name = "testScan";
      byte [] prefix = Bytes.toBytes(name);
      scan.setFilter(new PrefixFilter(prefix));
      sb = Writables.getBytes(scan);
      desScan = (Scan)Writables.getWritable(sb, new Scan());
      Filter f = desScan.getFilter();
      assertTrue(f instanceof PrefixFilter);
    }


    assertEquals(scan.getMaxVersions(), desScan.getMaxVersions());
    TimeRange tr = scan.getTimeRange();

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      // Check two things:
      // 1. result list contains expected values
      // 2. result list is sorted properly


      Scan scan = new Scan();
      Filter filter = new SingleColumnValueExcludeFilter(cf_essential, col_normal,
                                                         CompareOp.NOT_EQUAL, filtered_val);
      scan.setFilter(filter);
      scan.setLoadColumnFamiliesOnDemand(true);
      InternalScanner s = region.getScanner(scan);

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        region.put(put);
      }


      Scan scan = new Scan();
      scan.setLoadColumnFamiliesOnDemand(true);
      Filter bogusFilter = new FilterBase() {
        @Override
        public boolean isFamilyEssential(byte[] name) {
          return Bytes.equals(name, cf_first);
        }
        @Override

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