Examples of 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.

Examples of org.kiji.schema.KijiRowData

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


  @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"));
  }

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Examples of org.kiji.schema.KijiRowData

  }


  @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"));
  }

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Examples of org.kiji.schema.KijiRowData

  }


  @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"));
  }

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Examples of org.kiji.schema.KijiRowData

    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());
  }

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Examples of org.kiji.schema.KijiRowData

    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());
  }

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Examples of org.kiji.schema.KijiRowData

    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());
  }

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Examples of org.kiji.schema.KijiRowData

      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);

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Examples of org.kiji.schema.KijiRowData

    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());
  }

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Examples of org.kiji.schema.KijiRowData

    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());
  }

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Examples of org.kiji.schema.KijiRowData

    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());
  }

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Examples of KijiRowData

Checking for existence of cells

Dealing with large rows

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData

Examples of org.kiji.schema.KijiRowData