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https://github.com/msfjarvis/compose-lobsters
synced 2025-08-14 18:47:03 +05:30
feat(database): build a custom serializer for SavedPost
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@ -9,6 +9,7 @@ import dev.msfjarvis.claw.gradle.addTestDependencies
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plugins {
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id("dev.msfjarvis.claw.android-library")
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id("dev.msfjarvis.claw.kotlin-android")
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alias(libs.plugins.kotlin.serialization)
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alias(libs.plugins.anvil)
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alias(libs.plugins.sqldelight)
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alias(libs.plugins.whetstone)
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@ -33,6 +34,7 @@ dependencies {
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implementation(libs.sqldelight.androidDriver)
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implementation(libs.sqldelight.primitiveAdapters)
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implementation(libs.sqlite.android)
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implementation(libs.kotlinx.serialization.core)
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testImplementation(libs.sqldelight.jvmDriver)
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addTestDependencies(project)
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@ -0,0 +1,99 @@
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/*
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* Copyright © 2023 Harsh Shandilya.
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* Use of this source code is governed by an MIT-style
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* license that can be found in the LICENSE file or at
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* https://opensource.org/licenses/MIT.
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*/
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package dev.msfjarvis.claw.database
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import dev.msfjarvis.claw.database.local.SavedPost
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import kotlinx.serialization.ExperimentalSerializationApi
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import kotlinx.serialization.KSerializer
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import kotlinx.serialization.Serializer
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import kotlinx.serialization.builtins.ListSerializer
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import kotlinx.serialization.builtins.serializer
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import kotlinx.serialization.descriptors.SerialDescriptor
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import kotlinx.serialization.descriptors.buildClassSerialDescriptor
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import kotlinx.serialization.descriptors.element
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import kotlinx.serialization.encoding.CompositeDecoder
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import kotlinx.serialization.encoding.Decoder
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import kotlinx.serialization.encoding.Encoder
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import kotlinx.serialization.encoding.decodeStructure
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import kotlinx.serialization.encoding.encodeStructure
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@OptIn(ExperimentalSerializationApi::class)
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@Serializer(forClass = SavedPost::class)
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class SavedPostSerializer : KSerializer<SavedPost> {
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private val delegateSerializer = ListSerializer(String.serializer())
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override val descriptor: SerialDescriptor =
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buildClassSerialDescriptor("SavedPost") {
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element<String>("shortId")
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element<String>("title")
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element<String>("url")
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element<String>("createdAt")
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element<Int?>("commentCount", isOptional = true)
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element<String>("commentsUrl")
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element<String>("submitterName")
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element<String>("submitterAvatarUrl")
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element<List<String>>("tags")
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element<String>("description")
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}
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override fun deserialize(decoder: Decoder): SavedPost {
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return decoder.decodeStructure(descriptor) {
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var shortId = ""
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var title = ""
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var url = ""
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var createdAt = ""
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var commentCount: Int? = null
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var commentsUrl = ""
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var submitterName = ""
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var submitterAvatarUrl = ""
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var tags = emptyList<String>()
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var description = ""
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while (true) {
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when (val index = decodeElementIndex(descriptor)) {
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0 -> shortId = decodeStringElement(descriptor, 0)
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1 -> title = decodeStringElement(descriptor, 1)
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2 -> url = decodeStringElement(descriptor, 2)
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3 -> createdAt = decodeStringElement(descriptor, 3)
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4 -> commentCount = decodeNullableSerializableElement(descriptor, 4, Int.serializer())
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5 -> commentsUrl = decodeStringElement(descriptor, 5)
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6 -> submitterName = decodeStringElement(descriptor, 6)
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7 -> submitterAvatarUrl = decodeStringElement(descriptor, 7)
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8 -> tags = decodeSerializableElement(descriptor, 8, delegateSerializer)
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9 -> description = decodeStringElement(descriptor, 9)
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CompositeDecoder.DECODE_DONE -> break
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else -> error("Unexpected index: $index")
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}
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}
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SavedPost(
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shortId = shortId,
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title = title,
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url = url,
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createdAt = createdAt,
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commentCount = commentCount,
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commentsUrl = commentsUrl,
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submitterName = submitterName,
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submitterAvatarUrl = submitterAvatarUrl,
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tags = tags,
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description = description,
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)
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}
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}
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override fun serialize(encoder: Encoder, value: SavedPost) {
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encoder.encodeStructure(descriptor) {
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encodeStringElement(descriptor, 0, value.shortId)
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encodeStringElement(descriptor, 1, value.title)
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encodeStringElement(descriptor, 2, value.url)
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encodeStringElement(descriptor, 3, value.createdAt)
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encodeNullableSerializableElement(descriptor, 4, Int.serializer(), value.commentCount)
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encodeStringElement(descriptor, 5, value.commentsUrl)
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encodeStringElement(descriptor, 6, value.submitterName)
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encodeStringElement(descriptor, 7, value.submitterAvatarUrl)
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encodeSerializableElement(descriptor, 8, delegateSerializer, value.tags)
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encodeStringElement(descriptor, 9, value.description)
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}
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}
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}
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