add dataset adapter class
add dataset adapter class


Former-commit-id: 1c6bc817c1d83c390ebcc49f0b9de0e5c1812fbe [formerly ca46881eb49f971b6e6e69da8861cfa318acd51d] [formerly 3b0b91d4e54a50cf939f3dd5ea6e46aeef2b3e6d]
Former-commit-id: fa20bb620d844b1cbfe8e286fed19c091626bffa
Former-commit-id: c8482bd22637e1830c95980c064fc78f1d02fa22
dssg/wikienergy,dssg/wikienergy,dssg/wikienergy,dssg/wikienergy,dssg/wikienergy