Handler
Value members
Concrete methods
Inherited methods
Prepares a BSONReader that returns the result of applying f
on the result of this reader.
Prepares a BSONReader that returns the result of applying f
on the result of this reader.
import scala.util.Try
import reactivemongo.api.bson.{ BSONReader, BSONValue }
// Try to return an integer + 1,
// from any T that can be read from BSON
// and is a numeric type
def fromBSON[T](bson: BSONValue)(
implicit r: BSONReader[T], n: Numeric[T]): Try[Int] = {
val r2: BSONReader[Int] = r.afterRead { v => n.toInt(v) + 1 }
r2.readTry(bson)
}
- Value parameters:
- f
the function to apply
- Inherited from:
- BSONReader
Prepares a BSON writer that returns the result of applying f on the BSON value from this writer.
Prepares a BSON writer that returns the result of applying f on the BSON value from this writer.
If the f function is not defined for a BSONValue,
it will results in a Failure.
- Value parameters:
- f
the partial function to apply
- Inherited from:
- BSONWriter
Prepares a BSON writer that returns the result of applying f on the BSON value from this writer.
Prepares a BSON writer that returns the result of applying f on the BSON value from this writer.
- Value parameters:
- f
the safe function to apply
- Inherited from:
- BSONWriter
Prepares a BSONReader that transforms the input BSON value, using the given f function, before passing the transformed BSON value to the current reader.
Prepares a BSONReader that transforms the input BSON value, using the given f function, before passing the transformed BSON value to the current reader.
import reactivemongo.api.bson.{
BSONReader, BSONInteger, BSONNull, BSONString
}
val normalizingReader: BSONReader[Int] =
implicitly[BSONReader[Int]].beforeRead {
case BSONNull => BSONInteger(-1)
case BSONString(s) => BSONInteger(s.size)
// other values are unchanged
}
normalizingReader.readOpt(BSONNull) // Some(-1)
normalizingReader.readTry(BSONString("foo")) // Success(3)
normalizingReader.readOpt(BSONInteger(4)) // unchanged: Some(4)
- Inherited from:
- BSONReader
Prepares a BSONReader that transforms the input BSON value, using the given f function, before passing the transformed BSON value to the current reader.
Prepares a BSONReader that transforms the input BSON value, using the given f function, before passing the transformed BSON value to the current reader.
- Inherited from:
- BSONReader
Prepares a BSON writer that converts the input before calling the current writer.
Prepares a BSON writer that converts the input before calling the current writer.
- Value parameters:
- f
the function apply the
Uinput value to convert atTvalue used to the current writerimport reactivemongo.api.bson.BSONWriter val w: BSONWriter[String] = implicitly[BSONWriter[Int]].beforeWrite(_.size) w.writeTry("foo") // Success: BSONInteger(3)
- Inherited from:
- BSONWriter
Narrows this writer for a compatible type U.
Narrows this writer for a compatible type U.
import reactivemongo.api.bson.BSONWriter
val listWriter: BSONWriter[Seq[String]] =
implicitly[BSONWriter[Seq[String]]]
val narrowAsListWriter: BSONWriter[List[String]] =
listWriter.narrow[List[String]]
// as List[String] <: Seq[String]
- Type parameters:
- U
must be a sub-type of
T
- Inherited from:
- BSONWriter
Tries to produce an instance of T from the bson value,
returns the default value if an error occurred.
Tries to produce an instance of T from the bson value,
returns the default value if an error occurred.
import reactivemongo.api.bson.{ BSONReader, BSONValue }
def fromBSON[T](bson: BSONValue, v: T)(implicit r: BSONReader[T]): T =
r.readOrElse(bson, v)
- Inherited from:
- BSONReader
Widens this reader for a compatible type U.
Widens this reader for a compatible type U.
import reactivemongo.api.bson.BSONReader
val listReader: BSONReader[List[String]] =
implicitly[BSONReader[List[String]]]
val widenAsSeqReader: BSONReader[Seq[String]] =
listReader.widen[Seq[String]]
// as Seq[String] >: List[String]
- Type parameters:
- U
must be a super-type of
T
- Inherited from:
- BSONReader
Tries to produce a BSON value from an instance of T,
returns None if an error occurred.
Tries to produce a BSON value from an instance of T,
returns None if an error occurred.
import reactivemongo.api.bson.{ BSONWriter, BSONValue }
def maybeBSON[T](value: T)(implicit w: BSONWriter[T]): Option[BSONValue] =
w.writeOpt(value)
- Inherited from:
- BSONWriter