FEATURE: Deserialization support for default values

[kishorereddy]

Overview

This library kiit.serialization will likely be replaced with kotlinx.serialization.
For now, this feature added until further research/effort is put into kotlinx.serialization for the use cases here and in the client apps of kiit.

// Sample Type with null and default values.
data class SampleObject2(
   val tStr1:String, 
   val tStr2:String? = null, 
   val tDate: DateTime = DateTimes.now(), 
   val tBool:Boolean = true, 
   val tInt:Int = 0
)

fun test_object_with_nulls_defaults(sample2: SampleObject2):Unit{
    // work here.
}

// Test deserializing with nulls and default values ( from instance ) - see below 
val tests = listOf<String>(
    """{ "sample2": { "tStr1": "abc" } }""",
    """{ "sample2": { "tStr1": "abc", "tStr2": "123" } }""",
    """{ "sample2": { "tStr1": "abc", "tStr2": "123", "tDate": "2026-01-30T18:00:00Z" } }""",
    """{ "sample2": { "tStr1": "abc", "tStr2": "123", "tDate": "2026-01-30T18:00:00Z", "tBool": false } }""",
    """{ "sample2": { "tStr1": "abc", "tStr2": "123", "tDate": "2026-01-30T18:00:00Z", "tBool": false, "tInt": 2 } }""",
)
val date = DateTimes.parse("2026-01-30T18:00:00Z")
val expectedItems = listOf(
    SampleObject2("abc"),
    SampleObject2("abc", "123"),
    SampleObject2("abc", "123", date),
    SampleObject2("abc", "123", date, false),
    SampleObject2("abc", "123", date, false, 2),
)

// Use the default objects for getting properties for nulls/default values
val deserializer = JsonDeserializer(
    defaults = mapOf(
           SampleObject2::class.qualifiedName!! to SampleObject2("test")
     )
)
val results = deserializer.deserialize(this::test_object_with_nulls_defaults.parameters, tests[0])
            

Ticket(s)

n/a

Links(s)

n/a

Dependencies

n/a

Design

WIP

Notes

n/a

Pending

n/a

Tests

1. Cleaned up the Deserialization tests
2. Added tests for loading nulls and default values