Examples of 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}.

Examples of org.kiji.schema.KijiDataRequest

    assertEquals(spec, spec2);
  }


  @Test
  public void testColumnOverride() throws IOException {
    final KijiDataRequest normalRequest =
        KijiDataRequest.create(EMPTY.getFamily(), EMPTY.getQualifier());
    final KijiDataRequest overrideRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create()
        .add(EMPTY, ColumnReaderSpec.avroReaderSchemaSpecific(TestRecord1.class))).build();


    final KijiTable table = getKiji().openTable("table");
    try {

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Examples of org.kiji.schema.KijiDataRequest

    }
  }


  @Test
  public void testFailOnOverride() throws IOException {
    final KijiDataRequest request = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create()
        .add(EMPTY, ColumnReaderSpec.avroReaderSchemaSpecific(TestRecord1.class))).build();


    final KijiTable table = getKiji().openTable("table");
    try {

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Examples of org.kiji.schema.KijiDataRequest

    }
  }


  @Test
  public void testOverrideAtConstruction() throws IOException {
    final KijiDataRequest normalRequest =
        KijiDataRequest.create(EMPTY.getFamily(), EMPTY.getQualifier());
    final KijiDataRequest overrideRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create()
        .add(EMPTY, ColumnReaderSpec.avroReaderSchemaSpecific(TestRecord1.class))).build();


    final KijiTable table = getKiji().openTable("table");
    try {

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Examples of org.kiji.schema.KijiDataRequest

    }
  }


  @Test
  public void testAlternative() throws IOException {
    final KijiDataRequest normalRequest =
        KijiDataRequest.create(EMPTY.getFamily(), EMPTY.getQualifier());
    final KijiDataRequest overrideRequest = KijiDataRequest.builder()
        .addColumns(ColumnsDef.create()
            .add(EMPTY, ColumnReaderSpec.avroReaderSchemaSpecific(TestRecord1.class))).build();


    final KijiTable table = getKiji().openTable("table");
    try {

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Examples of org.kiji.schema.KijiDataRequest

  }


  /** {@inheritDoc} */
  @Override
  public <U extends T> KijiResult<U> narrowView(final KijiColumnName column) {
    final KijiDataRequest narrowRequest = DefaultKijiResult.narrowRequest(column, mDataRequest);


    return new CassandraPagedKijiResult<U>(
        mEntityId,
        narrowRequest,
        mTable,

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Examples of org.kiji.schema.KijiDataRequest

  public void testTimeToLive() throws Exception {


    // TTL is 10 seconds for this cell.
    mWriter.put(mEntityId, FAMILY, QUALIFIER, TIMESTAMP, VALUE);


    final KijiDataRequest dataRequest = KijiDataRequest.create(FAMILY, QUALIFIER);


    // The data should be there now!
    KijiRowData rowData = mReader.get(mEntityId, dataRequest);
    String s = rowData.getValue(FAMILY, QUALIFIER, TIMESTAMP).toString();
    assertEquals(s, VALUE);

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Examples of org.kiji.schema.KijiDataRequest

    final KijiTable table = kiji.openTable("table");
    try {
      final KijiTableReader reader = table.getReaderFactory().openTableReader();
      try {
        final EntityId eid = table.getEntityId("row");
        final KijiDataRequest dataRequest = KijiDataRequest.builder()
            .addColumns(ColumnsDef.create().addFamily("family"))
            .build();
        final KijiRowData row = reader.get(eid, dataRequest);
        assertEquals(
            Schema.Type.STRING,

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Examples of org.kiji.schema.KijiDataRequest


      final TableLayoutDesc update = KijiTableLayouts.getLayout(TEST_LAYOUT_V2);
      update.setReferenceLayout(table.getLayout().getDesc().getLayoutId());
      mKiji.modifyTableLayout(update);


      final KijiDataRequest dataRequest = KijiDataRequest.builder()
          .addColumns(ColumnsDef.create().addFamily("family"))
          .build();


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

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Examples of org.kiji.schema.KijiDataRequest

      }


      // Read the record back (should be a generic record):
      final KijiTableReader reader = table.openTableReader();
      try {
        final KijiDataRequest dataRequest = KijiDataRequest.builder()
            .addColumns(ColumnsDef.create().add("family", "qualifier"))
            .build();
        final KijiRowData row = reader.get(table.getEntityId("eid"), dataRequest);
        final GenericData.Record record = row.getValue("family", "qualifier", 1L);
        assertEquals(writerSchema, record.getSchema());

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Examples of org.kiji.schema.KijiDataRequest

    }


    final CellDecoderProvider requestDecoderProvider =
        decoderProvider.getDecoderProviderForRequest(dataRequest);


    final KijiDataRequest unpagedRequest = unpagedRequestBuilder.build();
    final KijiDataRequest pagedRequest = pagedRequestBuilder.build();


    if (unpagedRequest.isEmpty() && pagedRequest.isEmpty()) {
      return new EmptyKijiResult<T>(entityId, dataRequest);
    }


    final MaterializedKijiResult<T> materializedKijiResult;
    if (!unpagedRequest.isEmpty()) {
      materializedKijiResult =
          createMaterialized(
              table.getURI(),
              entityId,
              unpagedRequest,
              layout,
              columnTranslator,
              requestDecoderProvider,
              table.getAdmin());
    } else {
      materializedKijiResult = null;
    }


    final CassandraPagedKijiResult<T> pagedKijiResult;
    if (!pagedRequest.isEmpty()) {
      pagedKijiResult =
          new CassandraPagedKijiResult<T>(
              entityId,
              pagedRequest,
              table,
              layout,
              columnTranslator,
              requestDecoderProvider);
    } else {
      pagedKijiResult = null;
    }


    if (unpagedRequest.isEmpty()) {
      return pagedKijiResult;
    } else if (pagedRequest.isEmpty()) {
      return materializedKijiResult;
    } else {
      return DefaultKijiResult.create(dataRequest, materializedKijiResult, pagedKijiResult);
    }
  }

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