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}.

    mWriter.put(mEntityId, MAP, KEY1, 1L, 1);
    mWriter.put(mEntityId, MAP, KEY2, 1L, 2);
    mWriter.put(mEntityId, FAMILY, QUAL0, 1L, "string1");
    mWriter.put(mEntityId, FAMILY, QUAL0, 2L, "string2");


    final KijiDataRequest dataRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create().withMaxVersions(3).addFamily("map"))
        .build();


    final KijiRowData row1 = mReader.get(mEntityId, dataRequest);
    final List<KijiCell<Integer>> cells = Lists.newArrayList(row1.<Integer>asIterable(MAP));

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            ToolUtils.getMapTypeFamilies(argURI.getColumns(), tableLayout);


        final Map<FamilyLayout, List<ColumnLayout>> groupTypeColumns =
            ToolUtils.getGroupTypeColumns(argURI.getColumns(), tableLayout);


        final KijiDataRequest request = ToolUtils.getDataRequest(
            mapTypeFamilies, groupTypeColumns, mMaxVersions, mMinTimestamp, mMaxTimestamp);


        final KijiTableReader reader = table.openTableReader();
        try {
            // Return the specified entity.

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  public void testBasicReadAndWrite() throws Exception {
    mBufferedWriter.put(mEntityId, "info", "name", 0L, "Value at timestamp 0.");
    mBufferedWriter.put(mEntityId, "info", "name", 1L, "Value at timestamp 1.");


    // These have not been flushed yet, so should not be present.
    final KijiDataRequest dataRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create().withMaxVersions(10).add("info", "name"))
        .build();


    KijiRowData rowData;
    rowData = mReader.get(mEntityId, dataRequest);

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  }




  @Test
  public void testPutWithTimestamp() throws Exception {
    final KijiDataRequest request = KijiDataRequest.create("info", "name");


    // Write a value now.
    mWriter.put(mEntityId, "info", "name", 123L, "old");


    // Buffer the new value and confirm it has not been written.

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    assertEquals("baz", actual2);
  }


  @Test
  public void testDeleteColumn() throws Exception {
    final KijiDataRequest request = KijiDataRequest.create("info");


    // Write initial value.
    mWriter.put(mEntityId, "info", "name", 123L, "not empty");
    mWriter.put(mEntityId, "info", "email", 123L, "not empty");

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    assertTrue(mReader.get(mEntityId, request).containsCell("info", "email", 123L));
  }


  @Test
  public void testDeleteCell() throws Exception {
    final KijiDataRequest request = KijiDataRequest.create("info", "name");


    // Write initial value.
    mWriter.put(mEntityId, "info", "name", 123L, "not empty");


    // Buffer the delete and confirm it has not happened yet.

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    assertFalse(mReader.get(mEntityId, request).containsCell("info", "name", 123L));
  }


  @Test
  public void testDeleteCellNoTimestamp() throws Exception {
    final KijiDataRequest request = KijiDataRequest.create("info", "name");


    // Write initial value.
    mWriter.put(mEntityId, "info", "name", 123L, "not empty");


    // Buffer the delete and confirm it has not happened yet.

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    }
  }


  @Test
  public void testSetBufferSize() throws Exception {
    final KijiDataRequest request = KijiDataRequest.create("info", "name");


    // TODO: Remove duplicate puts from test when buffered writer calculates buffer size correctly.
    // (Right now the buffer size is measured in C* Statements, not bytes.)


    // Add a put to the buffer.

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  @Test
  public void testBufferPutWithDelete() throws Exception {
    final EntityId oldEntityId = mTable.getEntityId("foo");
    final EntityId newEntityId = mTable.getEntityId("bar");
    final KijiDataRequest request = KijiDataRequest.create("info", "name");


    // Initialize data for the old entity ID.
    mWriter.put(oldEntityId, "info", "name", "foo-name");


    // Buffer a delete for "foo" and a put to "bar" and confirm they have not been written.

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  ) {
    mResult = result;
    mCells = Iterators.peekingIterator(mResult.iterator());
    mLayout = layout;


    final KijiDataRequest dataRequest = mResult.getDataRequest();
    final Collection<Column> columnRequests = dataRequest.getColumns();
    Preconditions.checkArgument(columnRequests.size() == 1,
        "Can not create KijiResultPager with multiple columns. Data request: %s.", dataRequest);
    mColumnRequest = columnRequests.iterator().next();
  }

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