@Override
protected void doHadoopWork() throws BuildException {
Tuple tuple = ContextManager.getCurrentTuple();
if (tuple == null) {
throw new BuildException(
this.getTaskName()
+ " should be put inside task container which provides tuple to execution context");
}
try {
if (tuple.getType(fieldNumber) != DataType.TUPLE
|| !(tuple.get(fieldNumber) instanceof Tuple)) {
throw new BuildException("Tuple field " + fieldNumber + " doesn't represent a Tuple");
}
ContextManager.setCurrentTupleContext((Tuple) tuple.get(fieldNumber));
try {
for (Task task : tasks) {
task.perform();
}
} finally {
ContextManager.resetCurrentTupleContext();
}
} catch (ExecException e) {
throw new BuildException("Failed to check type of tuple field " + fieldNumber, e);
}
}
/**
* Method put places the values of the given tuple into the positions specified by the fields
* argument. The declarator Fields value declares the fields in this Tuple instance.
*
* @param declarator of type Fields
* @param fields of type Fields
* @param tuple of type Tuple
*/
public void put(Fields declarator, Fields fields, Tuple tuple) {
verifyModifiable();
int[] pos = declarator.getPos(fields, size());
for (int i = 0; i < pos.length; i++) elements.set(pos[i], tuple.get(i));
}