gsonpath.model.MandatoryFieldInfoFactory.kt Maven / Gradle / Ivy
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An annotation processor which generates Type Adapters for the Google Gson library
package gsonpath.model
class MandatoryFieldInfoFactory {
/**
* Keeps track of mandatory json field metadata.
*/
class MandatoryFieldInfo(
val indexVariableName: String,
val gsonField: GsonField)
/**
* Add any mandatory field indexes as constants. This is done for code readability.
* We will obtain the values using a depth-first recursion.
*/
fun createMandatoryFieldsFromGsonObject(gsonObject: GsonObject): Map {
return gsonObject.entries()
.fold(emptyMap()) { map, (_, gsonModel) ->
when (gsonModel) {
is GsonField -> handleField(gsonModel, map)
is GsonObject -> map.plus(createMandatoryFieldsFromGsonObject(gsonModel))
is GsonArray -> handleArray(gsonModel, map)
}
}
}
/**
* For all required fields we add an index field so we can easily check whether the
* value has been assigned after the json has been parsed.
*/
private fun handleField(
gsonModel: GsonField,
map: Map): Map {
return when {
gsonModel.isRequired -> {
val fieldName = gsonModel.fieldInfo.fieldName
val mandatoryFieldIndexName = "MANDATORY_INDEX_" + fieldName.toUpperCase()
// Keep track of the information for later use. Since this is a linked list, we keep track of insert order.
map.plus(Pair(fieldName, MandatoryFieldInfo(mandatoryFieldIndexName, gsonModel)))
}
else -> map
}
}
private fun handleArray(
arrayModel: GsonArray,
map: Map): Map {
return arrayModel.entries()
.fold(map) { arrayMap, (_, arrayGsonModel) ->
when (arrayGsonModel) {
is GsonField -> handleField(arrayGsonModel, arrayMap)
is GsonObject -> arrayMap.plus(createMandatoryFieldsFromGsonObject(arrayGsonModel))
}
}
}
}