Examples of org.kiji.schema.layout.ColumnReaderSpec

org.kiji.schema.layout.ColumnReaderSpec
Specification of read properties applied when decoding cells from a column in a Kiji table.
This class provides several factory methods to specify read properties applied when decoding a column in a Kiji table.

Note: this object assumes that Avro Schema objects are never mutated. In particular, one should never modify the properties of a Schema object (eg. using {@link Schema#addProp(String,String)} after it has been constructed.

ColumnReaderSpec Implements {@link Serializable} because{@link org.kiji.schema.KijiDataRequest} requires it. Do not rely on Java serialization, it willeventually be replaced by Avro, see SCHEMA-589.

    }


    int maxVersions = Math.max(col1.getMaxVersions(), col2.getMaxVersions());


    // Merge column read properties. We don't actually merge but enforce consistency:
    final ColumnReaderSpec readerSpec;
    if (col1.getReaderSpec() == null) {
      readerSpec = col2.getReaderSpec();
    } else if (col2.getReaderSpec() == null) {
      readerSpec = col1.getReaderSpec();
    } else if (Objects.equal(col1.getReaderSpec(), col2.getReaderSpec())) {

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        .build();
  }


  @Test
  public void testSerialization() throws IOException, ClassNotFoundException {
    final ColumnReaderSpec spec = ColumnReaderSpec.avroDefaultReaderSchemaGeneric();
    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
    final ObjectOutputStream oos = new ObjectOutputStream(baos);
    oos.writeObject(spec);
    final ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
    final ObjectInputStream ois = new ObjectInputStream(bais);
    final ColumnReaderSpec spec2 = (ColumnReaderSpec) ois.readObject();
    assertEquals(spec, spec2);
  }

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        .build();
  }


  @Test
  public void testSerialization() throws IOException, ClassNotFoundException {
    final ColumnReaderSpec spec = ColumnReaderSpec.avroDefaultReaderSchemaGeneric();
    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
    final ObjectOutputStream oos = new ObjectOutputStream(baos);
    oos.writeObject(spec);
    final ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
    final ObjectInputStream ois = new ObjectInputStream(bais);
    final ColumnReaderSpec spec2 = (ColumnReaderSpec) ois.readObject();
    assertEquals(spec, spec2);
  }

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  public CellDecoderProvider getDecoderProviderForRequest(
      final KijiDataRequest request
  ) throws IOException {
    final List<BoundColumnReaderSpec> readerSpecs = Lists.newArrayList();
    for (Column columnRequest : request.getColumns()) {
      final ColumnReaderSpec readerSpec = columnRequest.getReaderSpec();
      if (readerSpec != null) {
        final KijiColumnName column = columnRequest.getColumnName();
        readerSpecs.add(BoundColumnReaderSpec.create(readerSpec, column));
      }
    }


    if (readerSpecs.isEmpty()) {
      return this;
    }


    final Map<KijiColumnName, KijiCellDecoder<?>> columnDecoders = Maps.newHashMap();
    columnDecoders.putAll(this.mColumnDecoders);


    for (BoundColumnReaderSpec readerSpec : readerSpecs) {
      columnDecoders.put(readerSpec.getColumn(), getDecoder(readerSpec));
    }


    return new CellDecoderProvider(
        mLayout,
        ImmutableMap.copyOf(columnDecoders),

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Related Classes of org.kiji.schema.layout.ColumnReaderSpec

org.apache.avro.Schema

org.kiji.schema.cassandra.TestCassandraColumnReaderSpec

org.kiji.schema.KijiDataRequest

org.kiji.schema.layout.impl.CellDecoderProvider

org.kiji.schema.TestColumnReaderSpec

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