Examples with JsonWriter org.apache.drill.exec.vector.complex.fn.JsonWriter used on opensource projects

Example 1 with JsonWriter

use of org.apache.drill.exec.vector.complex.fn.JsonWriter in project drill by apache.

the class TestRepeated method listOfList.

//
//  @Test
//  public void repeatedMap() {
//
//    /**
//     * We're going to try to create an object that looks like:
//     *
//     *  {
//     *    a: [
//     *      {x: 1, y: 2}
//     *      {x: 2, y: 1}
//     *    ]
//     *  }
//     *
//     */
//    MapVector v = new MapVector("", allocator);
//    ComplexWriter writer = new ComplexWriterImpl("col", v);
//
//    MapWriter map = writer.rootAsMap();
//
//    map.start();
//    ListWriter list = map.list("a");
//    MapWriter inner = list.map();
//
//    IntHolder holder = new IntHolder();
//    IntWriter xCol = inner.integer("x");
//    IntWriter yCol = inner.integer("y");
//
//    inner.start();
//
//    holder.value = 1;
//    xCol.write(holder);
//    holder.value = 2;
//    yCol.write(holder);
//
//    inner.end();
//
//    inner.start();
//
//    holder.value = 2;
//    xCol.write(holder);
//    holder.value = 1;
//    yCol.write(holder);
//
//    inner.end();
//
//    IntWriter numCol = map.integer("nums");
//    holder.value = 14;
//    numCol.write(holder);
//
//    map.end();
//
//
//    assertTrue(writer.ok());
//
//    System.out.println(v.getAccessor().getObject(0));
//
//  }
@Test
public void listOfList() throws Exception {
    /**
     * We're going to try to create an object that looks like:
     *
     *  {
     *    a: [
     *      [1,2,3],
     *      [2,3,4]
     *    ],
     *    nums: 14,
     *    b: [
     *      { c: 1 },
     *      { c: 2 , x: 15}
     *    ]
     *  }
     *
     */
    final MapVector mapVector = new MapVector("", allocator, null);
    final ComplexWriterImpl writer = new ComplexWriterImpl("col", mapVector);
    writer.allocate();
    {
        final MapWriter map = writer.rootAsMap();
        final ListWriter list = map.list("a");
        list.startList();
        final ListWriter innerList = list.list();
        final IntWriter innerInt = innerList.integer();
        innerList.startList();
        final IntHolder holder = new IntHolder();
        holder.value = 1;
        innerInt.write(holder);
        holder.value = 2;
        innerInt.write(holder);
        holder.value = 3;
        innerInt.write(holder);
        innerList.endList();
        innerList.startList();
        holder.value = 4;
        innerInt.write(holder);
        holder.value = 5;
        innerInt.write(holder);
        innerList.endList();
        list.endList();
        final IntWriter numCol = map.integer("nums");
        holder.value = 14;
        numCol.write(holder);
        final MapWriter repeatedMap = map.list("b").map();
        repeatedMap.start();
        holder.value = 1;
        repeatedMap.integer("c").write(holder);
        repeatedMap.end();
        repeatedMap.start();
        holder.value = 2;
        repeatedMap.integer("c").write(holder);
        final BigIntHolder h = new BigIntHolder();
        h.value = 15;
        repeatedMap.bigInt("x").write(h);
        repeatedMap.end();
        map.end();
    }
    {
        writer.setPosition(1);
        final MapWriter map = writer.rootAsMap();
        final ListWriter list = map.list("a");
        list.startList();
        final ListWriter innerList = list.list();
        final IntWriter innerInt = innerList.integer();
        innerList.startList();
        final IntHolder holder = new IntHolder();
        holder.value = -1;
        innerInt.write(holder);
        holder.value = -2;
        innerInt.write(holder);
        holder.value = -3;
        innerInt.write(holder);
        innerList.endList();
        innerList.startList();
        holder.value = -4;
        innerInt.write(holder);
        holder.value = -5;
        innerInt.write(holder);
        innerList.endList();
        list.endList();
        final IntWriter numCol = map.integer("nums");
        holder.value = -28;
        numCol.write(holder);
        final MapWriter repeatedMap = map.list("b").map();
        repeatedMap.start();
        holder.value = -1;
        repeatedMap.integer("c").write(holder);
        repeatedMap.end();
        repeatedMap.start();
        holder.value = -2;
        repeatedMap.integer("c").write(holder);
        final BigIntHolder h = new BigIntHolder();
        h.value = -30;
        repeatedMap.bigInt("x").write(h);
        repeatedMap.end();
        map.end();
    }
    final ObjectWriter ow = new ObjectMapper().writer().withDefaultPrettyPrinter();
    System.out.println("Map of Object[0]: " + ow.writeValueAsString(mapVector.getAccessor().getObject(0)));
    System.out.println("Map of Object[1]: " + ow.writeValueAsString(mapVector.getAccessor().getObject(1)));
    final ByteArrayOutputStream stream = new ByteArrayOutputStream();
    final JsonWriter jsonWriter = new JsonWriter(stream, true, true);
    final FieldReader reader = mapVector.getChild("col", MapVector.class).getReader();
    reader.setPosition(0);
    jsonWriter.write(reader);
    reader.setPosition(1);
    jsonWriter.write(reader);
    System.out.print("Json Read: ");
    System.out.println(new String(stream.toByteArray(), Charsets.UTF_8));
    writer.close();
}