private CoGroupOperatorSetsPredicate(Keys<I1> keys1) {
if (keys1 == null) {
throw new NullPointerException();
}
if (keys1.isEmpty()) {
throw new InvalidProgramException("The co-group keys must not be empty.");
}
this.keys1 = keys1;
}
private CoGroupOperatorWithoutFunction(Keys<I2> keys2) {
if (keys2 == null) {
throw new NullPointerException();
}
if (keys2.isEmpty()) {
throw new InvalidProgramException("The co-group keys must not be empty.");
}
this.keys2 = keys2;
this.groupSortKeyOrderFirst = new ArrayList<>();
this.groupSortKeyOrderSecond = new ArrayList<>();
}
/**
* Intermediate step of a CoGroup transformation. <br>
* To continue the CoGroup transformation, provide a {@link
* org.apache.flink.api.common.functions.RichCoGroupFunction} by calling {@link
* org.apache.flink.api.java.operators.CoGroupOperator.CoGroupOperatorSets.CoGroupOperatorSetsPredicate.CoGroupOperatorWithoutFunction#with(org.apache.flink.api.common.functions.CoGroupFunction)}.
*/
private CoGroupOperatorWithoutFunction createCoGroupOperator(Keys<I2> keys2) {
if (keys2 == null) {
throw new NullPointerException();
}
if (keys2.isEmpty()) {
throw new InvalidProgramException("The co-group keys must not be empty.");
}
try {
keys1.areCompatible(keys2);
} catch (IncompatibleKeysException ike) {
throw new InvalidProgramException(
"The pair of co-group keys are not compatible with each other.", ike);
}
return new CoGroupOperatorWithoutFunction(keys2);
}