Examples of org.kiji.schema.KijiRowData

org.kiji.schema.KijiRowData
the value stored in the column named 'info:name' with a timestamp of 42. final String name = row.getValue("info", "name", 42L);
We also provide additional methods for accessing data stored withing a row. See the documentation below for methods with the name 'get*' for more information.

Checking for existence of cells

Since rows within a Kiji table may not contain all the columns defined within a layout we need a way to check this in code. KijiRowData contains several methods to help with this:
```
  final KijiRowData row = myTableReader.get(myEntityId, myDataRequest); if (row.containsColumn("info", "name")) { // Now that we know the cell exists, read the value. final String name = row.getMostRecentValue("info", "name"); } if (row.containsCell("info", "name", 42L)) { // Now that we know that this cell exists at the timestamp of 42. final String name = row.getValue("info", "name", 42L); }  
```
Dealing with large rows

Rows in Kiji tables may contain large amounts of data. In some cases, this is caused by storing many versions of a cell with different timestamps in a row. This can become a problem when the size of a row/cell exceeds the amount of RAM available. To deal with large rows, you may use paging through a {@link KijiPager}. When paging is enabled on a column, cells from that column may only be accessed through {@link #getPager(String)} and {@link #getPager(String,String)}. See the documentation for {@link KijiPager} for more information.

      final EntityId eid
  ) throws IOException {
    final KijiDataRequest pagedRequest = KijiDataRequest.builder().addColumns(
        ColumnsDef.create().withPageSize(10).withMaxVersions(10000).add("map", null)).build();
    {
      final KijiRowData warmupRowData = reader.get(eid, pagedRequest);
      for (KijiCell<Integer> cell : warmupRowData.<Integer>asIterable("map")) {
        cell.getData();
      }
      final KijiResult<Object> warmupResult = reader.getResult(eid, pagedRequest);
      try {
        for (KijiCell<Object> cell : warmupResult) {

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                .add("family", "qual1"))
            .addColumns(ColumnsDef.create()
                .withMaxVersions(3)
                .add("family", "qual2"))
            .build();
        final KijiRowData row = reader.get(table.getEntityId("row0"), dataRequest);
        assertEquals(1, row.getValues("family", "qual0").size());
        assertEquals(2, row.getValues("family", "qual1").size());
        assertEquals(3, row.getValues("family", "qual2").size());
      } finally {
        reader.close();
      }
    } finally {
      table.release();

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      try {
        final KijiDataRequest dataRequest = KijiDataRequest.builder()
            .addColumns(ColumnsDef.create()
                .addFamily("family"))
            .build();
        final KijiRowData row = reader.get(table.getEntityId("row0"), dataRequest);
        assertEquals(1, row.getValues("family", "qual0").size());
        assertEquals(1, row.getValues("family", "qual1").size());
      } finally {
        reader.close();
      }
    } finally {
      table.release();

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        final KijiDataRequest dataRequest = KijiDataRequest.builder()
            .addColumns(ColumnsDef.create().withMaxVersions(100).add("family", "column"))
            .build();


        // Try this as a get.
        final KijiRowData rowData = reader.get(table.getEntityId("row1"), dataRequest);
        String s = rowData.getValue("family", "column", 0L).toString();
        assertEquals(s, "Value at timestamp 0.");


        // Try this as a scan.
        int rowCounter = 0;
        final KijiRowScanner rowScanner = reader.getScanner(dataRequest);

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    assertEquals(MR_BONKERS, mReader.get(mEntityId, request).getValue(INFO, NAME, 5L).toString());


    mPutter.commit();


    KijiRowData rowData = mReader.get(mEntityId, request);
    assertEquals(BIRDHEAD, rowData.getValue(INFO, NAME, 0L).toString());
    assertEquals(MR_BONKERS, rowData.getValue(INFO, NAME, 5L).toString());
    assertEquals(AMINO_MAN, rowData.getValue(INFO, NAME, 10L).toString());
  }

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Examples of org.kiji.schema.KijiRowData

Checking for existence of cells

Dealing with large rows

Related Classes of org.kiji.schema.KijiRowData