question: public Map < URI , List < URI > > addSourceVolumeSnapshots ( ) { List < URI > blockSnapshots = Lists . newArrayList ( ) ; Map < URI , List < URI > > snapshotsMap = new HashMap < > ( ) ; for ( URI volumeId : uris ( volumeIds ) ) { List < URI > snapshots = getSnapshots ( volumeId ) ; blockSnapshots . addAll ( snapshots ) ; snapshotsMap . put ( volumeId , snapshots ) ; } if ( ! blockSnapshots . isEmpty ( ) ) { BlockStorageUtils . addVolumesToConsistencyGroup ( consistencyGroup , blockSnapshots ) ; } return snapshotsMap ; }
target:  Adds all source volumes' snapshots to the consistency group