Examples of org.kiji.schema.KijiDataRequest

org.kiji.schema.KijiDataRequest
Describes a request for columns of data to read from a Kiji table.

KijiDataRequest objects are immutable. To create a KijiDataRequest, use the {@link #builder()} method to get a new {@link KijiDataRequestBuilder} object.Populate the object's fields, then call {@link KijiDataRequestBuilder#build()}.

For example, to request the 3 most recent versions of cell data from a column bar from the family foo within the time range [123, 456):
```
 KijiDataRequestBuilder builder = KijiDataRequest.builder() .withTimeRange(123L, 456L); builder.newColumnsDef().withMaxVersions(3).add("foo", "bar"); KijiDataRequest request = builder.build(); 
```
Or:
```
 KijiDataRequest dataRequest = KijiDataRequest.builder() .withTimeRange(123L, 456L) .addColumns(KijiDataRequestBuilder.ColumnsDef.create().withMaxVersions(3).add("foo", "bar")) .build(); 
```
For convenience, you can also build KijiDataRequests for a single cell using the KijiDataRequest.create() method:
```
 KijiDataRequest dataRequest = KijiDataRequest.create("info", "foo"); 
```
You cannot set any properties of the requested column using this syntax; for further customization, see {@link KijiDataRequestBuilder}.

   @Test
  public void testDeleteColumn() throws Exception {
    mWriter.put(mEntityId, "family", "column", 0L, "Value at timestamp 0.");
    mWriter.put(mEntityId, "family", "column", 1L, "Value at timestamp 1.");


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


    // Try this as a get.
    KijiRowData rowData = mReader.get(mEntityId, dataRequest);

View Full Code Here

        writer.put(david, pets, bird, 0L, "Da Bird");
      } finally {
        writer.close();
      }


      final KijiDataRequest dataRequest = KijiDataRequest.builder()
          .addColumns(
              ColumnsDef
                  .create()
                  .withMaxVersions(100)
                  .add(pets, cat)

View Full Code Here

        writer.put(david, pets, bird, 0L, "Da Bird");
      } finally {
        writer.close();
      }


      final KijiDataRequest dataRequest = KijiDataRequest.builder()
          .addColumns(
              ColumnsDef
                  .create()
                  .withMaxVersions(100)
                  .add(pets, cat)

View Full Code Here

  }


  // Attempt to read a value that is not there.  Should return null, not throw an exception!
  @Test
  public void testReadMissingValue() throws Exception {
    final KijiDataRequest dataRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create().withMaxVersions(100).add("family", "column"))
        .build();


    KijiRowData rowData = mReader.get(mEntityId, dataRequest);
    assertNull(rowData.getValue("family", "column", 0L));

View Full Code Here

  @Test
  public void testDeleteFamily() throws Exception {
    mWriter.put(mEntityId, "family", "column", 0L, "Value at timestamp 0.");
    mWriter.put(mEntityId, "family", "column", 1L, "Value at timestamp 1.");


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


    // Try this as a get.
    KijiRowData rowData = mReader.get(mEntityId, dataRequest);

View Full Code Here

  @Test
  public void testDeleteRow() throws Exception {
    mWriter.put(mEntityId, "family", "column", 0L, "Value at timestamp 0.");
    mWriter.put(mEntityId, "family", "column", 1L, "Value at timestamp 1.");


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


    // Try this as a get.
    KijiRowData rowData = mReader.get(mEntityId, dataRequest);

View Full Code Here

      EntityId eid = mTable.getEntityId("row#" + rowNum);
      mWriter.put(eid, "family", "column", "This is row " + rowNum + ".");
      entityIds.add(eid);
    }


    KijiDataRequest request = KijiDataRequest.create("family", "column");


    List<KijiRowData> dataList = mReader.bulkGet(entityIds, request);


    assertEquals(numRows, dataList.size());

View Full Code Here

  @Test
  public void testHConstantsLatestTimestamp() throws Exception {
    mWriter.put(mEntityId, "family", "column", HConstants.LATEST_TIMESTAMP, "latest");
    //mWriter.put(mEntityId, "family", "column", "latest");


    final KijiDataRequest dataRequest = KijiDataRequest.create("family", "column");


    // Sanity check that the write succeeded.
    KijiRowData rowData = mReader.get(mEntityId, dataRequest);
    KijiCell cell = rowData.getMostRecentCell("family", "column");
    assertNotNull(cell);

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        writer.put(david, family, column, 0L, bird);
      } finally {
        writer.close();
      }


      final KijiDataRequest dataRequest = KijiDataRequest.create(family, column);
      final CassandraKijiTableReader reader = table.openTableReader();


      try {
        // Fire up a row scanner!
        final KijiRowScanner scanner = reader.getScanner(dataRequest);

View Full Code Here


  /** {@inheritDoc} */
  @Override
  @SuppressWarnings("unchecked")
  public <U extends T> KijiResult<U> narrowView(final KijiColumnName column) {
    final KijiDataRequest narrowRequest = DefaultKijiResult.narrowRequest(column, mDataRequest);
    if (mDataRequest.equals(narrowRequest)) {
      return (KijiResult<U>) this;
    } else {
      return new EmptyKijiResult<U>(mEntityId, narrowRequest);
    }

View Full Code Here

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