How to use

CoGroupOperatorBase

in

eu.stratosphere.api.common.operators.base

/**
 * Gets the order of elements within a group for the first input.
 * If no such order has been set, this method returns null.
 * 
 * @return The group order for the first input.
 */
public Ordering getGroupOrderForInputOne() {
  return getGroupOrder(0);
}

/**
 * Sets the order of the elements within a group for the first input.
 * 
 * @param order The order for the elements in a group.
 */
public void setGroupOrderForInputOne(Ordering order) {
  setGroupOrder(0, order);
}

    new CoGroupOperatorBase<I1, I2, OUT, GenericCoGrouper<I1, I2, OUT>>(
        function, new BinaryOperatorInformation<I1, I2, OUT>(getInput1Type(), getInput2Type(), getResultType()),
        logicalKeyPositions1, logicalKeyPositions2, name);
po.setFirstInput(input1);
po.setSecondInput(input2);
po.setDegreeOfParallelism(this.getParallelism());

@Override
protected List<OperatorDescriptorDual> getPossibleProperties() {
  Ordering groupOrder1 = null;
  Ordering groupOrder2 = null;
  
  CoGroupOperatorBase<?, ?, ?, ?> cgc = getPactContract();
  groupOrder1 = cgc.getGroupOrderForInputOne();
  groupOrder2 = cgc.getGroupOrderForInputTwo();
    
  if (groupOrder1 != null && groupOrder1.getNumberOfFields() == 0) {
    groupOrder1 = null;
  }
  if (groupOrder2 != null && groupOrder2.getNumberOfFields() == 0) {
    groupOrder2 = null;
  }
  
  List<OperatorDescriptorDual> l = new ArrayList<OperatorDescriptorDual>(1);
  l.add(new CoGroupDescriptor(this.keys1, this.keys2, groupOrder1, groupOrder2));
  return l;
}

@Override
protected List<OperatorDescriptorDual> getPossibleProperties() {
  Ordering groupOrder1 = null;
  Ordering groupOrder2 = null;
  
  CoGroupOperatorBase<?, ?, ?, ?> cgc = getPactContract();
  groupOrder1 = cgc.getGroupOrderForInputOne();
  groupOrder2 = cgc.getGroupOrderForInputTwo();
    
  if (groupOrder1 != null && groupOrder1.getNumberOfFields() == 0) {
    groupOrder1 = null;
  }
  if (groupOrder2 != null && groupOrder2.getNumberOfFields() == 0) {
    groupOrder2 = null;
  }
  
  List<OperatorDescriptorDual> l = new ArrayList<OperatorDescriptorDual>(1);
  l.add(new CoGroupDescriptor(this.keys1, this.keys2, groupOrder1, groupOrder2));
  return l;
}

Ordering groupOrder1 = ((CoGroupOperatorBase<?, ?, ?, ?>) contract).getGroupOrderForInputOne();
Ordering groupOrder2 = ((CoGroupOperatorBase<?, ?, ?, ?>) contract).getGroupOrderForInputTwo();

/**
 * Sets the order of the elements within a group for the first input.
 * 
 * @param order The order for the elements in a group.
 */
public void setGroupOrderForInputOne(Ordering order) {
  setGroupOrder(0, order);
}

/**
 * Gets the order of elements within a group for the second input.
 * If no such order has been set, this method returns null.
 * 
 * @return The group order for the second input.
 */
public Ordering getGroupOrderForInputTwo() {
  return getGroupOrder(1);
}

Ordering groupOrder1 = ((CoGroupOperatorBase<?, ?, ?, ?>) contract).getGroupOrderForInputOne();
Ordering groupOrder2 = ((CoGroupOperatorBase<?, ?, ?, ?>) contract).getGroupOrderForInputTwo();

/**
 * Sets the order of the elements within a group for the second input.
 * 
 * @param order The order for the elements in a group.
 */
public void setGroupOrderForInputTwo(Ordering order) {
  setGroupOrder(1, order);
}

/**
 * Gets the order of elements within a group for the first input.
 * If no such order has been set, this method returns null.
 * 
 * @return The group order for the first input.
 */
public Ordering getGroupOrderForInputOne() {
  return getGroupOrder(0);
}

/**
 * Sets the order of the elements within a group for the second input.
 * 
 * @param order The order for the elements in a group.
 */
public void setGroupOrderForInputTwo(Ordering order) {
  setGroupOrder(1, order);
}

/**
 * Gets the order of elements within a group for the second input.
 * If no such order has been set, this method returns null.
 * 
 * @return The group order for the second input.
 */
public Ordering getGroupOrderForInputTwo() {
  return getGroupOrder(1);
}