Created
June 20, 2012 22:15
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(almost) transparent maps serialization
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| import com.novus.salat._ | |
| import com.novus.salat.global._ | |
| import com.mongodb.casbah.Imports._ | |
| import com.novus.salat.annotations._ | |
| case class KeyValuePair[K, V](key: K, value: V) | |
| object DaoMap { | |
| implicit def toDaoMap[K, V](map: Map[K, V]): Seq[KeyValuePair[K, V]] = { | |
| //TODO handle nested maps | |
| map.toSeq.map(x => { | |
| val v = x._2 match { | |
| case m: Map[_, _] => toDaoMap(m) | |
| case other => other | |
| } | |
| new KeyValuePair(x._1, v.asInstanceOf[V]) | |
| }).toSeq | |
| } | |
| //Because of type erasure reverse conversion becomes hard if not impossible. | |
| //Generic KeyValuePair is converted to List[Any] containing values of its two fields. | |
| } | |
| object Main extends scala.App { | |
| print("========\n") | |
| import DaoMap._ | |
| val test = Test("someId", Map("a.b" -> "c")) | |
| val serialized = grater[Test].asDBObject(test).toString | |
| val deserialized = grater[Test].fromJSON(serialized) | |
| val originalMap = deserialized._map | |
| print(serialized.toString + "\n") | |
| print(deserialized.toString + "\n") | |
| print(originalMap.toString() + "\n") | |
| print("\n========\n") | |
| } | |
| trait MapRestore { | |
| def restoreMap(seq: Seq[Any]): Map[Any, Any] = { | |
| seq.map(x => { | |
| val list = x.asInstanceOf[Seq[Any]] | |
| //TODO handle nested maps, | |
| //Is there a way to recognize a nested map? | |
| // Map(a-> Map(b->c, d->e)) | |
| // will be turned into [[a, [[b,c],[d,e]]]] | |
| //I guess any array of arrays of length 2 can be treated as a map. | |
| (list(0), list(1)) | |
| }).toMap | |
| } | |
| } | |
| case class Test( | |
| id: String, | |
| map: Seq[KeyValuePair[String, String]]) extends MapRestore { | |
| lazy val _map = restoreMap(map) | |
| } |
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