32 lines
1.0 KiB
Kotlin
32 lines
1.0 KiB
Kotlin
package ru.dbotthepony.kstarbound
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import com.google.gson.JsonElement
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import com.google.gson.TypeAdapter
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import com.google.gson.stream.JsonReader
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import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap
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import ru.dbotthepony.kstarbound.json.VersionedJson
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object VersionRegistry {
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private val versions = Object2IntOpenHashMap<String>()
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fun currentVersion(name: String): Int {
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return versions.getInt(name)
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}
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fun make(name: String, contents: JsonElement): VersionedJson {
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return VersionedJson(name, currentVersion(name), contents)
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}
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fun <T> load(name: String, reader: JsonReader, adapter: TypeAdapter<T>): T {
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val read = this.adapter.read(reader) ?: throw NullPointerException("Expected versioned json $name, but found null")
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if (read.version != currentVersion(name)) {
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throw IllegalStateException("NYI: Migrating $name from ${read.version} to ${currentVersion(name)}")
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}
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return adapter.fromJsonTree(read.content)
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}
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private val adapter by lazy { Starbound.gson.getAdapter(VersionedJson::class.java) }
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}
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