dk.nodes.nstack.kotlin.util.DateDeserializer.kt Maven / Gradle / Ivy

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nstack.io library for translations, update management and more.

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package dk.nodes.nstack.kotlin.util

import com.google.gson.JsonDeserializationContext
import com.google.gson.JsonDeserializer
import com.google.gson.JsonElement
import com.google.gson.JsonParseException
import java.lang.reflect.Type
import java.text.ParseException
import java.text.SimpleDateFormat
import java.util.Arrays
import java.util.Date
import java.util.HashMap
import java.util.Locale

internal class DateDeserializer : JsonDeserializer {
    @Throws(JsonParseException::class)
    override fun deserialize(
        jsonElement: JsonElement,
        typeOF: Type,
        context: JsonDeserializationContext
    ): Date {
        for (format in DATE_FORMATS) {
            if (!formatters.containsKey(format)) {
                formatters[format] = SimpleDateFormat(format, Locale.getDefault())
            }
            try {
                return formatters[format]?.parse(jsonElement.asString) ?: Date()
            } catch (e: ParseException) {
            }
        }
        throw JsonParseException(
            "Unparseable date: \"" + jsonElement.asString +
                "\". Supported formats: " + Arrays.toString(DATE_FORMATS)
        )
    }

    // replacement for a static member
    companion object {
        private val formatters = HashMap()
        val DATE_FORMATS = arrayOf(
                "yyyy-MM-dd'T'HH:mm:ss.SSSZ",
                "yyyy-MM-dd'T'HH:mm:ss'Z'",
                "yyyy-MM-dd'T'HH:mm:ssZ",
                "yyyy-MM-dd",
                "MMM dd, yyyy hh:mm:ss aaa"
        )
    }
}