Java Union.update方法代碼示例

import com.yahoo.sketches.hll.Union; //導入方法依賴的package包/類
/**
 * Union two sketches given explicit lgK and target HLL type
 *
 * @param firstSketch
 *   first sketch to be unioned.
 * @param secondSketch
 *          second sketch to be unioned.
 * @param lgK
 *   final output lgK
 *   This must be between 4 and 21.
 * @param type
 *   final output HLL type
 * @return resulting sketch of union.
 */
public BytesWritable evaluate(final BytesWritable firstSketch, final BytesWritable secondSketch,
    final int lgK, final String type) {

  final TgtHllType hllType = TgtHllType.valueOf(type);
  final Union union = new Union(lgK);

  if (firstSketch != null) {
    union.update(HllSketch.wrap(Memory.wrap(firstSketch.getBytes())));
  }

  if (secondSketch != null) {
    union.update(HllSketch.wrap(Memory.wrap(secondSketch.getBytes())));
  }

  return new BytesWritable(union.getResult(hllType).toCompactByteArray());
}
 

import com.yahoo.sketches.hll.Union; //導入方法依賴的package包/類
static void updateUnion(final DataBag bag, final Union union) throws ExecException {
  // Bag is not empty. process each innerTuple in the bag
  for (final Tuple innerTuple : bag) {
    final Object f0 = innerTuple.get(0); // consider only field 0
    if (f0 == null) {
      continue;
    }
    final byte type = innerTuple.getType(0);
    if (type == DataType.BYTEARRAY) {
      final DataByteArray dba = (DataByteArray) f0;
      union.update(HllSketch.wrap(Memory.wrap(dba.get())));
    } else {
      throw new IllegalArgumentException("Field type was not DataType.BYTEARRAY: " + type);
    }
  }
}
 

import com.yahoo.sketches.hll.Union; //導入方法依賴的package包/類
@Override
public Union getTestObject() {
    final Union union = new Union(15);
    union.update("A");
    union.update("B");
    union.update("C");
    return union;
}
 

import com.yahoo.sketches.hll.Union; //導入方法依賴的package包/類
@Override
protected HllSketch _apply(final HllSketch a, final HllSketch b) {
    final Union union = new Union(a.getLgConfigK());
    union.update(a);
    union.update(b);
    return union.getResult();
}
 

import com.yahoo.sketches.hll.Union; //導入方法依賴的package包/類
@Before
public void setup() {
    sketch1 = new Union(15);
    sketch1.update("A");
    sketch1.update("B");

    sketch2 = new Union(15);
    sketch2.update("C");
    sketch2.update("D");
}
 

import com.yahoo.sketches.hll.Union; //導入方法依賴的package包/類
@Test
public void testSerialiseAndDeserialise() {
    final Union sketch = new Union(15);
    sketch.update("A");
    sketch.update("B");
    sketch.update("C");
    testSerialiser(sketch);

    final Union emptySketch = new Union(15);
    testSerialiser(emptySketch);
}
 

import com.yahoo.sketches.hll.Union; //導入方法依賴的package包/類
@Override
public DataByteArray exec(final Tuple inputTuple) throws IOException {
  if (isFirstCall_) {
    Logger.getLogger(getClass()).info("Algebraic was used");
    isFirstCall_ = false;
  }
  if (inputTuple == null || inputTuple.size() == 0) {
    return getEmptySketch();
  }
  final Union union = new Union(lgK_);
  final DataBag outerBag = (DataBag) inputTuple.get(0);
  if (outerBag == null) {
    return getEmptySketch();
  }
  for (final Tuple dataTuple: outerBag) {
    final Object f0 = dataTuple.get(0); // inputTuple.bag0.dataTupleN.f0
    if (f0 == null) {
      continue;
    }
    if (f0 instanceof DataBag) {
      final DataBag innerBag = (DataBag) f0; // inputTuple.bag0.dataTupleN.f0:bag
      if (innerBag.size() == 0) { continue; }
      // If field 0 of a dataTuple is a Bag, all innerTuples of this inner bag
      // will be passed into the union.
      // It is due to system bagged outputs from multiple mapper Initial functions.
      // The Intermediate stage was bypassed.
      updateUnion(innerBag, union);
    } else if (f0 instanceof DataByteArray) { // inputTuple.bag0.dataTupleN.f0:DBA
      // If field 0 of a dataTuple is a DataByteArray, we assume it is a sketch
      // due to system bagged outputs from multiple mapper Intermediate functions.
      // Each dataTuple.DBA:sketch will merged into the union.
      final DataByteArray dba = (DataByteArray) f0;
      union.update(HllSketch.wrap(Memory.wrap(dba.get())));
    } else { // we should never get here
      throw new IllegalArgumentException("dataTuple.Field0 is not a DataBag or DataByteArray: "
          + f0.getClass().getName());
    }
  }
  return new DataByteArray(union.getResult(tgtHllType_).toCompactByteArray());
}
 

import com.yahoo.sketches.hll.Union; //導入方法依賴的package包/類
@Override
public Tuple exec(final Tuple inputTuple) throws IOException {
  if (isFirstCall_) {
    Logger.getLogger(getClass()).info("Algebraic was used");
    isFirstCall_ = false;
  }
  if (inputTuple == null || inputTuple.size() == 0) {
    return getEmptySketchTuple();
  }
  final DataBag outerBag = (DataBag) inputTuple.get(0);
  if (outerBag == null) {
    return getEmptySketchTuple();
  }
  final Union union = new Union(lgK_);
  for (final Tuple dataTuple: outerBag) {
    final Object f0 = dataTuple.get(0); // inputTuple.bag0.dataTupleN.f0
    if (f0 == null) { continue; }
    if (f0 instanceof DataBag) {
      final DataBag innerBag = (DataBag) f0; // inputTuple.bag0.dataTupleN.f0:bag
      if (innerBag.size() == 0) { continue; }
      // If field 0 of a dataTuple is a Bag, all innerTuples of this inner bag
      // will be passed into the union.
      // It is due to system bagged outputs from multiple mapper Initial functions.
      // The Intermediate stage was bypassed.
      updateUnion(innerBag, union);
    } else if (f0 instanceof DataByteArray) { // inputTuple.bag0.dataTupleN.f0:DBA
      // If field 0 of a dataTuple is a DataByteArray, we assume it is a sketch
      // due to system bagged outputs from multiple mapper Intermediate functions.
      // Each dataTuple.DBA:sketch will merged into the union.
      final DataByteArray dba = (DataByteArray) f0;
      union.update(HllSketch.wrap(Memory.wrap(dba.get())));
    } else { // we should never get here
      throw new IllegalArgumentException("dataTuple.Field0 is not a DataBag or DataByteArray: "
          + f0.getClass().getName());
    }
  }
  return tupleFactory_.newTuple(new DataByteArray(union.getResult(tgtHllType_).toCompactByteArray()));
}
 

import com.yahoo.sketches.hll.Union; //導入方法依賴的package包/類
@Override
protected Union _apply(final Union a, final Union b) {
    a.update(b.getResult());
    return a;
}
 

import com.yahoo.sketches.hll.Union; //導入方法依賴的package包/類
static void updateUnion(final DataBag bag, final Union union) throws ExecException {
  //Bag is not empty. process each innerTuple in the bag
  for (final Tuple innerTuple: bag) {
    final Object f0 = innerTuple.get(0); // consider only field 0
    if (f0 == null) {
      continue;
    }
    final byte type = innerTuple.getType(0);

    switch (type) {
      case DataType.NULL:
        break;
      case DataType.BYTE:
        union.update((byte) f0);
        break;
      case DataType.INTEGER:
        union.update((int) f0);
        break;
      case DataType.LONG:
        union.update((long) f0);
        break;
      case DataType.FLOAT:
        union.update((float) f0);
        break;
      case DataType.DOUBLE:
        union.update((double) f0);
        break;
      case DataType.BYTEARRAY: {
        final DataByteArray dba = (DataByteArray) f0;
        union.update(dba.get());
        break;
      }
      case DataType.CHARARRAY: {
        final String str = (String) f0;
        // conversion to char[] avoids costly UTF-8 encoding
        union.update(str.toCharArray());
        break;
      }
      default:
        throw new IllegalArgumentException("Field 0 of innerTuple must be one of "
            + "NULL, BYTE, INTEGER, LONG, FLOAT, DOUBLE, BYTEARRAY or CHARARRAY. "
            + "Given Type = " + DataType.findTypeName(type)
            + ", Object = " + f0.toString());
    }
  }
}