Created
September 18, 2019 12:47
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Kotlin JSON builder
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import com.google.gson.Gson | |
import com.google.gson.GsonBuilder | |
import com.google.gson.JsonArray | |
import com.google.gson.JsonElement | |
import com.google.gson.JsonObject | |
import com.google.gson.JsonParser | |
@DslMarker | |
annotation class JsonDSL | |
@JsonDSL | |
inline class JsonObjectBuilder(@PublishedApi internal val jsonObject: JsonObject) | |
{ | |
infix fun String.to(value: String?) { | |
jsonObject.addProperty(this, value) | |
} | |
infix fun String.to(value: Number?) { | |
jsonObject.addProperty(this, value) | |
} | |
infix fun String.to(value: Boolean?) { | |
jsonObject.addProperty(this, value) | |
} | |
infix fun String.to(element: JsonElement?) { | |
jsonObject.add(this, element) | |
} | |
inline infix fun String.toObject(block: JsonObjectBuilder.() -> Unit) { | |
jsonObject.add(this, jsonObject(block)) | |
} | |
inline infix fun String.toArray(block: JsonArrayBuilder.() -> Unit) { | |
jsonObject.add(this, jsonArray(block)) | |
} | |
} | |
@JsonDSL | |
inline class JsonArrayBuilder(@PublishedApi internal val jsonArray: JsonArray) | |
{ | |
operator fun String?.unaryPlus() { | |
jsonArray.add(this) | |
} | |
operator fun JsonElement?.unaryPlus() { | |
jsonArray.add(this) | |
} | |
fun add(element: JsonElement?) { | |
jsonArray.add(element) | |
} | |
fun add(number: Number?) { | |
jsonArray.add(number) | |
} | |
fun add(boolean: Boolean?) { | |
jsonArray.add(boolean) | |
} | |
inline fun addObject(block: JsonObjectBuilder.() -> Unit) { | |
jsonArray.add(jsonObject(block)) | |
} | |
inline fun addArray(block: JsonArrayBuilder.() -> Unit) { | |
jsonArray.add(jsonArray(block)) | |
} | |
} | |
inline fun jsonObject(block: JsonObjectBuilder.() -> Unit): JsonObject { | |
val jsonObject = JsonObject() | |
JsonObjectBuilder(jsonObject).apply(block) | |
return jsonObject | |
} | |
inline fun jsonArray(block: JsonArrayBuilder.() -> Unit): JsonArray { | |
val jsonArray = JsonArray() | |
JsonArrayBuilder(jsonArray).apply(block) | |
return jsonArray | |
} | |
val JsonElement.asObjectOrNull: JsonObject? | |
get() = if (isJsonObject) asJsonObject else null | |
val JsonElement.asArrayOrNull: JsonArray? | |
get() = if (isJsonArray) asJsonArray else null | |
val JsonElement.asStringOrNull: String? | |
get() = if (isJsonPrimitive && asJsonPrimitive.isString) asString else null | |
val JsonElement.asIntOrNull: Int? | |
get() = if (isJsonPrimitive) { | |
val primitive = asJsonPrimitive | |
when { | |
primitive.isNumber -> primitive.asNumber.toInt() | |
primitive.isString -> primitive.asString.toIntOrNull() | |
else -> null | |
} | |
} else { | |
null | |
} | |
val JsonElement.asBooleanOrNull: Boolean? | |
get() = if (isJsonPrimitive && asJsonPrimitive.isBoolean) asBoolean else null | |
fun JsonObject.getOrCreateObject(key: String): JsonObject { | |
return get(key)?.asObjectOrNull ?: JsonObject().also { add(key, it) } | |
} |
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