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}.


    final KijiTable table = kiji.openTable("row_data_test_table");
    try {
      final KijiTableReader reader = table.openTableReader();
      try {
        final KijiDataRequest dataRequest = KijiDataRequest.builder()
            .addColumns(ColumnsDef.create()
                .withPageSize(1)
                .addFamily("map"))
            .build();
        final KijiRowScanner scanner = reader.getScanner(dataRequest);

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        writer.close();
      }


      final KijiTableReader reader = table.openTableReader();
      try {
        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);

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    CLIENT_TEST_DELEGATE.tearDownKijiTest();
  }


  @Test
  public void testBasicPut() throws Exception {
    final KijiDataRequest request = KijiDataRequest.create(INFO, NAME);


    mWriter.put(mEntityId, INFO, NAME, MR_BONKERS);
    assertEquals(
        MR_BONKERS,
        mReader.get(mEntityId, request).getMostRecentValue(INFO, NAME).toString()

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    );
  }


  @Test
  public void testBasicPutWithTimestamp() throws Exception {
    final KijiDataRequest request = KijiDataRequest.builder().addColumns(
        KijiDataRequestBuilder.ColumnsDef.create().withMaxVersions(100).add(INFO, NAME)).build();


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

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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 {
          // Scan from startRow to limitRow.

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    }


    final int maxVersions = Math.min(mTotalVersions - mVersionsCount, pageSize);


    // Clone the column data request template, but adjust the max-timestamp and the max-versions:
    final KijiDataRequest nextPageDataRequest = KijiDataRequest.builder()
        .withTimeRange(mDataRequest.getMinTimestamp(), mPageMaxTimestamp)
        .addColumns(ColumnsDef.create()
            .withFilter(mColumnRequest.getFilter())
            .withMaxVersions(maxVersions)
            .add(mColumnName))

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


    final ImmutableSortedMap.Builder<KijiColumnName, List<KeyValue>> narrowedResults =
        ImmutableSortedMap.naturalOrder();


    for (Column columnRequest : narrowRequest.getColumns()) {
      final KijiColumnName requestColumnName = columnRequest.getColumnName();


      // We get here IF


      // `column` is a family, and `mDataRequest` contains a column request for the entire family.

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