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.

  // -----------------------------------------------------------------------------------------------


  @Test
  public void testDeleteAllCellsInRow() throws Exception {
    setupTableAndReader();
    final KijiRowData rowBefore =
        mReader.get(mTable.getEntityId("row-1"), KijiDataRequest.create("family"));
    assertTrue(rowBefore.containsColumn("family"));


    assertEquals(BaseTool.SUCCESS, runTool(new DeleteTool(),
      "--target=" + mTableURI,
      "--entity-id=row-1",
      "--interactive=false"
    ));


    final KijiRowData rowAfter =
        mReader.get(mTable.getEntityId("row-1"), KijiDataRequest.create("family"));
    assertFalse(rowAfter.containsColumn("family"));
  }

View Full Code Here

  }


  @Test
  public void testDeleteAllCellsInFamilyFromRow() throws Exception {
    setupTableAndReader();
    final KijiRowData rowBefore =
        mReader.get(mTable.getEntityId("row-1"), KijiDataRequest.create("family"));
    assertTrue(rowBefore.containsColumn("family"));


    // Target one column family:
    final KijiURI target =
        KijiURI.newBuilder(mTableURI).addColumnName(KijiColumnName.create("family")).build();


    assertEquals(BaseTool.SUCCESS, runTool(new DeleteTool(),
      "--target=" + target,
      "--entity-id=row-1",
      "--interactive=false"
    ));


    final KijiRowData rowAfter =
        mReader.get(mTable.getEntityId("row-1"), KijiDataRequest.create("family"));
    assertFalse(rowAfter.containsColumn("family"));
  }

View Full Code Here

  }


  @Test
  public void testDeleteAllCellsInColumnFromRow() throws Exception {
    setupTableAndReader();
    final KijiRowData rowBefore =
        mReader.get(mTable.getEntityId("row-1"), KijiDataRequest.create("family"));
    assertTrue(rowBefore.containsColumn("family"));


    // Target one column:
    final KijiURI target = KijiURI.newBuilder(mTableURI)
        .addColumnName(KijiColumnName.create("family", "column"))
        .build();


    assertEquals(BaseTool.SUCCESS, runTool(new DeleteTool(),
      "--target=" + target,
      "--entity-id=row-1",
      "--interactive=false"
    ));


    final KijiRowData rowAfter =
        mReader.get(mTable.getEntityId("row-1"), KijiDataRequest.create("family"));
    assertFalse(rowAfter.containsColumn("family"));
  }

View Full Code Here

    setupTableAndReader();
    final KijiDataRequestBuilder kdrb = KijiDataRequest.builder();
    kdrb.newColumnsDef().withMaxVersions(HConstants.ALL_VERSIONS)
        .add("family", "column");
    final KijiDataRequest kdr = kdrb.build();
    final KijiRowData rowBefore =
        mReader.get(mTable.getEntityId("row-1"), kdr);
    assertEquals(3, rowBefore.getValues("family", "column").size());
    assertEquals(315L, (long) rowBefore.getValues("family", "column").firstKey());


    // Target one column:
    final KijiURI target = KijiURI.newBuilder(mTableURI)
        .addColumnName(KijiColumnName.create("family", "column"))
        .build();


    // Delete cells with latest timestamp, ie. timestamp == 315
    assertEquals(BaseTool.SUCCESS, runTool(new DeleteTool(),
      "--target=" + target,
      "--entity-id=row-1",
      "--timestamp=latest",
      "--interactive=false"
    ));


    final KijiRowData rowAfter =
        mReader.get(mTable.getEntityId("row-1"), kdr);
    assertEquals(2, rowAfter.getValues("family", "column").size());
    assertEquals(314L, (long) rowAfter.getValues("family", "column").firstKey());
  }

View Full Code Here

    setupTableAndReader();
    final KijiDataRequestBuilder kdrb = KijiDataRequest.builder();
    kdrb.newColumnsDef().withMaxVersions(HConstants.ALL_VERSIONS)
        .add("family", "column");
    final KijiDataRequest kdr = kdrb.build();
    final KijiRowData rowBefore =
        mReader.get(mTable.getEntityId("row-1"), kdr);
    assertEquals(3, rowBefore.getValues("family", "column").size());
    assertEquals(315L, (long) rowBefore.getValues("family", "column").firstKey());


    // Target one column:
    final KijiURI target = KijiURI.newBuilder(mTableURI)
        .addColumnName(KijiColumnName.create("family", "column"))
        .build();


    // Delete cells with timestamp == 314
    assertEquals(BaseTool.SUCCESS, runTool(new DeleteTool(),
      "--target=" + target,
      "--entity-id=row-1",
      "--timestamp=314",
      "--interactive=false"
    ));


    final KijiRowData rowAfter = mReader.get(mTable.getEntityId("row-1"), kdr);
    assertEquals(2, rowAfter.getValues("family", "column").size());
    assertEquals(315L, (long) rowAfter.getValues("family", "column").firstKey());
    assertEquals(313L, (long) rowAfter.getValues("family", "column").lastKey());
  }

View Full Code Here

    setupTableAndReader();
    final KijiDataRequestBuilder kdrb = KijiDataRequest.builder();
    kdrb.newColumnsDef().withMaxVersions(HConstants.ALL_VERSIONS)
        .add("family", "column");
    final KijiDataRequest kdr = kdrb.build();
    final KijiRowData rowBefore =
        mReader.get(mTable.getEntityId("row-1"), kdr);
    assertEquals(3, rowBefore.getValues("family", "column").size());
    assertEquals(315L, (long) rowBefore.getValues("family", "column").firstKey());


    // Target one column:
    final KijiURI target = KijiURI.newBuilder(mTableURI)
        .addColumnName(KijiColumnName.create("family", "column"))
        .build();


    // Delete cells with timestamps <= 314
    assertEquals(BaseTool.SUCCESS, runTool(new DeleteTool(),
      "--target=" + target,
      "--entity-id=row-1",
      "--timestamp=upto:314",
      "--interactive=false"
    ));


    final KijiRowData rowAfter =
        mReader.get(mTable.getEntityId("row-1"), kdr);
    assertEquals(1, rowAfter.getValues("family", "column").size());
    assertEquals(315L, (long) rowAfter.getValues("family", "column").firstKey());
  }

View Full Code Here

      final KijiTableReader reader = table.getReaderFactory().openTableReader(overrides);
      try {
        final KijiDataRequest dataRequest = KijiDataRequest.builder()
            .addColumns(ColumnsDef.create().withFilter(new CellByteSizeAsValueFilter()).add(column))
            .build();
        final KijiRowData row = reader.get(eid, dataRequest);
        final GenericData.Fixed fixed32 = row.getMostRecentValue("family", "column");
        final int cellSize = Bytes.toInt(fixed32.bytes());


        // Cell size is: length(MD5-hash) + len(string size) + len(string)
        assertEquals(16 + 1 + 10, cellSize);

View Full Code Here

    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);
    final NavigableMap<Long, CharSequence> resultMap = myRowData.getValues("info", "name");
    assertEquals("The number of returned values is incorrect:", 1, resultMap.size());
    assertTrue(null != resultMap.get(5L));
    assertEquals("me-five", resultMap.get(5L).toString());
  }

View Full Code Here

    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);
    final NavigableMap<Long, CharSequence> resultMap = myRowData.getValues("info", "name");
    assertEquals("The number of returned values is incorrect:", 1, resultMap.size());
    assertTrue(null != resultMap.get(5L));
    assertEquals("me-five", resultMap.get(5L).toString());
  }

View Full Code Here

    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);
    final NavigableMap<String, NavigableMap<Long, CharSequence>> resultMap
        = myRowData.<CharSequence>getValues("jobs");
    assertEquals("The number of returned values is incorrect:", 1, resultMap.size());
    assertTrue(null != resultMap.get("a"));
    assertEquals("always coming in 1st", resultMap.get("a").get(5L).toString());
  }

View Full Code Here

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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