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

      try {
        final EntityId eid = table.getEntityId("row");


        // Make sure we have 2 versions in columns info:name and in info:email.
        {
          final KijiDataRequest dataRequest = KijiDataRequest.builder()
              .addColumns(ColumnsDef.create()
                  .withMaxVersions(HConstants.ALL_VERSIONS)
                  .addFamily("info"))
              .build();
          final KijiRowData row = reader.get(eid, dataRequest);
          assertEquals(2, row.getValues("info", "name").size());
          assertEquals(2, row.getValues("info", "email").size());
        }


        // Test FirstKeyOnly filter when applied on the group-type family.
        {
          final KijiDataRequest dataRequest = KijiDataRequest.builder()
              .addColumns(ColumnsDef.create()
                  .withMaxVersions(HConstants.ALL_VERSIONS)
                  .withFilter(new KijiFirstKeyOnlyColumnFilter())
                  .addFamily("info"))
              .build();
          final KijiRowData row = reader.get(eid, dataRequest);
          assertEquals(1, row.getValues("info", "name").size());
          assertEquals(1, row.getValues("info", "email").size());
        }


        // Test FirstKeyOnly filter when applied on a single column.
        // Make sure it doesn't affect other columns.
        {
          final KijiDataRequest dataRequest = KijiDataRequest.builder()
              .addColumns(ColumnsDef.create()
                  .withMaxVersions(HConstants.ALL_VERSIONS)
                  .withFilter(new KijiFirstKeyOnlyColumnFilter())
                  .add("info", "name"))
              .addColumns(ColumnsDef.create()
                  .withMaxVersions(HConstants.ALL_VERSIONS)
                  .add("info", "email"))
              .build();
          final KijiRowData row = reader.get(eid, dataRequest);
          assertEquals(1, row.getValues("info", "name").size());
          assertEquals(2, row.getValues("info", "email").size());
        }


        // Test FirstKeyOnly filter when applied on a single column.
        // Make sure it doesn't affect other columns.
        {
          final KijiDataRequest dataRequest = KijiDataRequest.builder()
              .addColumns(ColumnsDef.create()
                  .withMaxVersions(HConstants.ALL_VERSIONS)
                  .add("info", "name"))
              .addColumns(ColumnsDef.create()
                  .withMaxVersions(HConstants.ALL_VERSIONS)

View Full Code Here

Examples of org.kiji.schema.KijiDataRequest

        new KijiColumnRangeFilter(mMinQualifier, false, null, false),  // qualifier > mMinQualifier
        mColumnRequest.getFilter(),  // user filter
        new KijiPaginationFilter(pageSize),  // Select at most 1 version per qualifier
        new StripValueColumnFilter());  // discard the cell content, we just need the qualifiers


    final KijiDataRequest nextPageDataRequest = KijiDataRequest.builder()
        .withTimeRange(mDataRequest.getMinTimestamp(), mDataRequest.getMaxTimestamp())
        .addColumns(ColumnsDef.create()
            .withFilter(filter)
            .withMaxVersions(1)  // HBase pagination filter forces max-versions to 1
            .add(mFamily))

View Full Code Here

Examples of org.kiji.schema.KijiDataRequest

        }
      }


      final KijiTableReader reader = table.openTableReader();
      try {
        final KijiDataRequest dataRequest = KijiDataRequest.builder()
            .addColumns(ColumnsDef.create().withMaxVersions(2).add("family", "column"))
            .build();
        final KijiRowFilter rowFilter = new StripValueRowFilter();
        final KijiScannerOptions scannerOptions =
            new KijiScannerOptions().setKijiRowFilter(rowFilter);

View Full Code Here

Examples of org.kiji.schema.KijiDataRequest


    final KijiTable table = kiji.openTable("table");
    final KijiTableReader reader = table.openTableReader();


    // Verify the first row.
    final KijiDataRequest req = KijiDataRequest.create("family", "column");
    final KijiRowData row1 = reader.get(table.getEntityId("row1"), req);
    assertEquals("foo2", row1.getValue("family", "column", 2).toString());


    // Verify the second row.
    final KijiRowData row2 = reader.get(table.getEntityId("row2"), req);

View Full Code Here

Examples of org.kiji.schema.KijiDataRequest

        new KijiColumnRangeFilter(mMinQualifier, false, null, false),  // qualifier > mMinQualifier
        mColumnRequest.getFilter(),  // user filter
        new KijiPaginationFilter(pageSize),  // Select at most one version / qualifier.
        new StripValueColumnFilter());  // discard the cell content, we just need the qualifiers


    final KijiDataRequest nextPageDataRequest = KijiDataRequest.builder()
        .withTimeRange(mDataRequest.getMinTimestamp(), mDataRequest.getMaxTimestamp())
        .addColumns(ColumnsDef.create()
            .withFilter(filter)
            .withMaxVersions(1)  // HBase pagination filter forces max-versions to 1
            .add(mFamily))

View Full Code Here

Examples of org.kiji.schema.KijiDataRequest


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


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

View Full Code Here

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 HBaseMaterializedKijiResult<T> materializedKijiResult;
    if (!unpagedRequest.isEmpty()) {
      materializedKijiResult =
          HBaseMaterializedKijiResult.create(
              entityId,
              unpagedRequest,
              unpagedRawResult,
              layout,
              columnTranslator,
              requestDecoderProvider);
    } else {
      materializedKijiResult = null;
    }


    final HBasePagedKijiResult<T> pagedKijiResult;
    if (!pagedRequest.isEmpty()) {
      pagedKijiResult =
          new HBasePagedKijiResult<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);
    }
  }

View Full Code Here

Examples of org.kiji.schema.KijiDataRequest


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


    if (narrowRequest.isEmpty()) {
      return new EmptyKijiResult<U>(mMaterializedResult.getEntityId(), narrowRequest);
    }


    boolean containsPagedColumns = false;
    boolean containsUnpagedColumns = false;
    for (Column columnRequest : narrowRequest.getColumns()) {
      if (columnRequest.isPagingEnabled()) {
        containsPagedColumns = true;
      } else {
        containsUnpagedColumns = true;
      }

View Full Code Here

Examples of org.kiji.schema.KijiDataRequest

          EntityId mEntityId = mTable.getEntityId("eid-foo");


          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(
                  KijiDataRequestBuilder.ColumnsDef.create()
                      .withMaxVersions(2)
                      .add("family", "column"))
              .build();

View Full Code Here

Examples of org.kiji.schema.KijiDataRequest


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


    final ImmutableSortedMap.Builder<KijiColumnName, List<KijiCell<U>>> narrowedColumns =
        ImmutableSortedMap.naturalOrder();


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


      // (Object) cast is necessary. Might be: http://bugs.java.com/view_bug.do?bug_id=6548436
      final List<KijiCell<U>> exactColumn =
          (List<KijiCell<U>>) (Object) mColumns.get(requestedColumn);

View Full Code Here

0 1 2 3 4 5

TOP

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.