initial commit

core/build.gradle.kts

@@ -0,0 +1,98 @@
+import org.gradle.kotlin.dsl.test
+import java.util.Properties
+
+plugins {
+    alias(libs.plugins.dokka)
+    alias(libs.plugins.kotlin.jvm)
+    alias(libs.plugins.maven.publish)}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation(libs.kotlinx.serialization.json)
+    testImplementation(kotlin("test"))
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+kotlin {
+    jvmToolchain(11)
+}
+
+val javadocJar by tasks.register<Jar>("dokkaJavadocJar") {
+    dependsOn(tasks.dokkaJavadoc)
+    from(tasks.dokkaJavadoc.flatMap { it.outputDirectory })
+    archiveClassifier.set("javadoc")
+}
+
+val sourcesJar by tasks.register<Jar>("sourcesJar") {
+    from(sourceSets.main.get().allSource)
+    archiveClassifier.set("sources")
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("maven") {
+            groupId = rootProject.group.toString()
+            artifactId = "paging"
+            version = rootProject.version.toString()
+            from(components["java"])
+            artifact(javadocJar)
+            artifact(sourcesJar)
+        }
+    }
+    repositories {
+        val secretFile = rootProject.file("secret.properties")
+        if (secretFile.exists()) {
+            val secret = Properties()
+            secretFile.inputStream().also { secret.load(it) }
+
+            val mavenUrl = secret["neuon.maven.url"] as? String
+            val mavenUsername = secret["neuon.maven.username"] as? String
+            val mavenPassword = secret["neuon.maven.password"] as? String
+
+            if (mavenUrl != null && mavenUsername != null && mavenPassword != null) {
+                maven {
+                    requireNotNull(mavenUrl) {
+                        "neuon.maven.url is missing from secret.properties"
+                    }
+                    requireNotNull(mavenUsername) {
+                        "neuon.maven.username is missing from secret.properties"
+                    }
+                    requireNotNull(mavenPassword) {
+                        "neuon.maven.password is missing from secret.properties"
+                    }
+                    name = "neuon"
+                    url = uri(mavenUrl)
+
+                    credentials(PasswordCredentials::class) {
+                        username = mavenUsername
+                        password = mavenPassword
+                    }
+                }
+            } else {
+                val list = listOfNotNull(
+                    "neuon.maven.url".takeIf { mavenUrl == null },
+                    "neuon.maven.username".takeIf { mavenUsername == null },
+                    "neuon.maven.password".takeIf { mavenPassword == null },
+                )
+                val message = buildString {
+                    append("Missing Maven publication in secret.properties: ")
+                    append(list.joinToString())
+                    append(". Ignore this if you don't plan on publishing this library")
+                }
+
+                logger.error(message)
+            }
+        } else {
+            logger.error(
+                buildString {
+                    append("Missing secret.properties. Ignore this if you don't plan on publishing this library")
+                },
+            )
+        }
+    }
+}

core/src/main/kotlin/ai/neuon/utility/paging/PagingConfig.kt

@@ -0,0 +1,11 @@
+package ai.neuon.utility.paging
+
+data class PagingConfig(
+    val index: Int,
+    val size: Int,
+) {
+    init {
+        check(index >= 0)
+        check(size > 0)
+    }
+}

core/src/main/kotlin/ai/neuon/utility/paging/PagingData.kt

@@ -0,0 +1,44 @@
+package ai.neuon.utility.paging
+
+import kotlinx.serialization.json.JsonPrimitive
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.putJsonObject
+import kotlin.math.ceil
+import kotlin.math.max
+import kotlin.math.roundToLong
+
+data class PagingData<T>(
+    val i: Int, val pageSize: Int, val totalItemsCount: Long? = null,
+    val list: List<T>,
+) {
+    companion object {
+        fun <T> empty(index: Int = 0, size: Int = 10): PagingData<T> {
+            return PagingData(
+                i = index,
+                pageSize = size,
+                list = emptyList(),
+            )
+        }
+
+        fun <T> empty(config: PagingConfig): PagingData<T> {
+            return empty(index = config.index, size = config.size)
+        }
+    }
+
+    fun buildPagingJsonObject() = buildJsonObject {
+        putJsonObject("config") {
+            put("index", JsonPrimitive(i))
+            put("size", JsonPrimitive(pageSize))
+        }
+        putJsonObject("page") {
+            totalItemsCount?.also { itemCount ->
+                max(
+                    1, ceil(
+                        itemCount.toFloat()
+                            .div(pageSize)
+                    ).roundToLong()
+                )
+            }
+        }
+    }
+}