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StandardMessageCodec class - services library

MessageCodec using the Flutter standard binary encoding.

Supported messages are acyclic values of these forms:

• null
• bools
• nums
• Strings
• Uint8Lists, Int32Lists, Int64Lists, Float64Lists
• Lists of supported values
• Maps from supported values to supported values

Decoded values will use List<Object?> and Map<Object?, Object?> irrespective of content.

The type returned from decodeMessage is dynamic (not Object?), which means no type checking is performed on its return value. It is strongly recommended that the return value be immediately cast to a known type to prevent runtime errors due to typos that the type checker could otherwise catch.

The codec is extensible by subclasses overriding writeValue and readValueOfType.

On Android, messages are represented as follows:

• null: null
• bool: java.lang.Boolean
• int: java.lang.Integer for values that are representable using 32-bit two's complement; java.lang.Long otherwise
• double: java.lang.Double
• String: java.lang.String
• Uint8List: byte[]
• Int32List: int[]
• Int64List: long[]
• Float64List: double[]
• List: java.util.ArrayList
• Map: java.util.HashMap

When sending a java.math.BigInteger from Java, it is converted into a String with the hexadecimal representation of the integer. (The value is tagged as being a big integer; subclasses of this class could be made to support it natively; see the discussion at writeValue.) This codec does not support sending big integers from Dart.

On iOS, messages are represented as follows:

• null: nil
• bool: NSNumber numberWithBool:
• int: NSNumber numberWithInt: for values that are representable using 32-bit two's complement; NSNumber numberWithLong: otherwise
• double: NSNumber numberWithDouble:
• String: NSString
• Uint8List, Int32List, Int64List, Float64List: FlutterStandardTypedData
• List: NSArray
• Map: NSDictionary

Implemented types

• MessageCodec<Object?>

StandardMessageCodec.new()

Creates a MessageCodec using the Flutter standard binary encoding.

const

hashCode → int

The hash code for this object.

no setterinherited

runtimeType → Type

A representation of the runtime type of the object.

no setterinherited

decodeMessage(ByteData? message) → dynamic

Decodes the specified message from binary.

override

encodeMessage(Object? message) → ByteData?

Encodes the specified message in binary.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

readSize(ReadBuffer buffer) → int

Reads a non-negative int from buffer as written by writeSize.

readValue(ReadBuffer buffer) → Object?

Reads a value from buffer as written by writeValue.

readValueOfType(int type, ReadBuffer buffer) → Object?

Reads a value of the indicated type from buffer.

toString() → String

A string representation of this object.

inherited

writeSize(WriteBuffer buffer, int value) → void

Writes a non-negative 32-bit integer value to buffer using an expanding 1-5 byte encoding that optimizes for small values.

writeValue(WriteBuffer buffer, Object? value) → void

Writes value to buffer by first writing a type discriminator byte, then the value itself.

operator ==(Object other) → bool

The equality operator.

inherited

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