/**
* Populates an entity from a row.
*
* @param entity Entity object to populate from a row.
* @param row Kiji row to populate the entity from.
* @return the populated entity.
* @throws IllegalAccessException
* @throws IOException
*/
public T populateEntityFromRow(T entity, KijiRowData row)
throws IllegalAccessException, IOException {
// Populate fields from the row columns:
for (final Field field : mColumnFields) {
final KijiColumn column = field.getAnnotation(KijiColumn.class);
Preconditions.checkState(column != null);
if (column.qualifier().isEmpty()) {
// Field is populated from a map-type family:
populateFieldFromMapTypeFamily(entity, field, column, row);
} else {
// Field is populated from a fully-qualified column:
populateFieldFromFullyQualifiedColumn(entity, field, column, row);
}
}
// Populate fields from the row entity ID:
for (final Field field : mEntityIdFields) {
final EntityIdField eidField = field.getAnnotation(EntityIdField.class);
Preconditions.checkState(eidField != null);
final int index = mRowKeyComponentIndexMap.get(eidField.component());
field.set(entity, row.getEntityId().getComponentByIndex(index));
}
return entity;
}
/**
* Populates the specified key and value with the next key-value pair read from the input split.
*
* @param key instance to populate with the next key read.
* @param value instance to popualte with the next value read.
* @return <code>true</code> if a new key-value was read, <code>false</code> if we have reached
* the end of the input split.
*/
@Override
public boolean next(KijiKey key, KijiValue value) {
if (mIterator.hasNext()) {
// Read the next row and store it in the provided key/value pair.
final KijiRowData row = mIterator.next();
if (null != key) {
key.set(row.getEntityId());
}
if (null != value) {
value.set(row);
}
return true;
} else {
return false;
}
}
/** {@inheritDoc} */
@Override
protected void map(KijiRowData input, Context mapContext) throws IOException {
mProducerContext.setEntityId(input.getEntityId());
mProducer.produce(input, mProducerContext);
mapContext.getCounter(JobHistoryCounters.PRODUCER_ROWS_PROCESSED).increment(1);
}