Examples of org.kiji.schema.filter.KijiColumnFilter

org.kiji.schema.filter.KijiColumnFilter
A column filter provides a means of filtering cells from a column on the server side.
To make your jobs more efficient, you may use a KijiColumnFilter to specify that certain cells from a column be filtered. The cells will be filtered on the server, which reduces the amount of data that needs to be sent to the client.

KijiColumnFilters filter cells from a column, in contrast with KijiRowFilters, which filters rows from a table.

Classes extending KijiColumnFilter must implement the hashCode and equals methods.
@see org.kiji.schema.filter.KijiRowFilter @see org.kiji.schema.KijiDataRequestBuilder.ColumnsDef#withFilter(KijiColumnFilter)

    writer.put(id, "info", "name", 2L, "me-too");
    writer.put(id, "info", "name", 3L, "me-three");
    writer.put(id, "info", "name", 4L, "me-four");
    writer.put(id, "info", "name", 5L, "me-five");
    ResourceUtils.closeOrLog(writer);
    final KijiColumnFilter columnFilter = new KijiPaginationFilter(1);
    final KijiDataRequestBuilder builder = KijiDataRequest.builder();
    builder.newColumnsDef().withMaxVersions(5).withFilter(columnFilter).add("info", "name");
    final KijiDataRequest dataRequest = builder.build();
    EntityId meId = mTable.getEntityId(Bytes.toBytes("me"));
    KijiRowData myRowData = mReader.get(meId, dataRequest);

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    writer.put(id, "info", "name", 2L, "me-too");
    writer.put(id, "info", "name", 3L, "me-three");
    writer.put(id, "info", "name", 4L, "me-four");
    writer.put(id, "info", "name", 5L, "me-five");
    ResourceUtils.closeOrLog(writer);
    final KijiColumnFilter columnFilter = new KijiPaginationFilter(1);
    final KijiDataRequestBuilder builder = KijiDataRequest.builder();
    builder.newColumnsDef().withMaxVersions(5).withFilter(columnFilter).add("info", "name");
    final KijiDataRequest dataRequest = builder.build();
    EntityId meId = mTable.getEntityId("me");
    KijiRowData myRowData = mReader.get(meId, dataRequest);

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    writer.put(id, "jobs", "d", 2L, "always coming in 4th");
    writer.put(id, "jobs", "c", 3L, "always coming in 3rd");
    writer.put(id, "jobs", "b", 4L, "always coming in 2nd");
    writer.put(id, "jobs", "a", 5L, "always coming in 1st");
    ResourceUtils.closeOrLog(writer);
    final KijiColumnFilter columnFilter = new KijiPaginationFilter(1);
    final KijiDataRequestBuilder builder = KijiDataRequest.builder();
    builder.newColumnsDef().withMaxVersions(5).withFilter(columnFilter).addFamily("jobs");
    final KijiDataRequest dataRequest = builder.build();
    EntityId meId = mTable.getEntityId(Bytes.toBytes("me"));
    KijiRowData myRowData = mReader.get(meId, dataRequest);

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    writer.put(id, "jobs", "b", 2L, "always coming in 4th");
    writer.put(id, "jobs", "b", 3L, "always coming in 3rd");
    writer.put(id, "jobs", "a", 4L, "always coming in 2nd");
    writer.put(id, "jobs", "a", 5L, "always coming in 1st");
    ResourceUtils.closeOrLog(writer);
    final KijiColumnFilter columnFilter =
        new KijiPaginationFilter(new RegexQualifierColumnFilter("b"), 1);
    final KijiDataRequestBuilder builder = KijiDataRequest.builder();
    builder.newColumnsDef().withMaxVersions(5).withFilter(columnFilter).addFamily("jobs");
    final KijiDataRequest dataRequest = builder.build();
    EntityId meId = mTable.getEntityId(Bytes.toBytes("me"));

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    Preconditions.checkArgument(pageSize > 0, "Page size must be >= 1, got %s", pageSize);


    // Clone the column data request template, adjusting the filters to restrict the range
    // and the number of qualifiers to fetch.


    final KijiColumnFilter filter = Filters.and(
        new KijiColumnRangeFilter(mMinQualifier, false, null, false),  // qualifier > mMinQualifier
        mColumnRequest.getFilter(),  // user filter
        new KijiPaginationFilter(pageSize),  // Select at most 1 version per qualifier
        new StripValueColumnFilter());  // discard the cell content, we just need the qualifiers

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    Preconditions.checkArgument(pageSize > 0, "Page size must be >= 1, got %s", pageSize);


    // Clone the column data request template, adjusting the filters to restrict the range
    // and the number of qualifiers to fetch.


    final KijiColumnFilter filter = Filters.and(
        new KijiColumnRangeFilter(mMinQualifier, false, null, false),  // qualifier > mMinQualifier
        mColumnRequest.getFilter(),  // user filter
        new KijiPaginationFilter(pageSize),  // Select at most one version / qualifier.
        new StripValueColumnFilter());  // discard the cell content, we just need the qualifiers

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      mCloser = Closer.create();


      try {
        final KijiColumnFilter.Context filterContext =
            new NameTranslatingFilterContext(mColumnTranslator);
        final KijiColumnFilter kijiFilter = columnRequest.getFilter();
        final Filter filter;
        if (kijiFilter != null) {
          filter = kijiFilter.toHBaseFilter(mColumn, filterContext);
        } else {
          filter = null;
        }


        final byte[] rowkey = mEntityId.getHBaseRowKey();

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Related Classes of org.kiji.schema.filter.KijiColumnFilter

org.kiji.schema.impl.hbase.HBaseMapFamilyPager

org.kiji.schema.impl.hbase.HBasePagedKijiResult$PagedColumnIterable

org.kiji.schema.impl.hbase.HBaseQualifierPager

org.kiji.schema.impl.TestKijiPaginationFilter

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