Add: Java APIのサンプルを追加

example/java/.gitattributes

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+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+

example/java/.gitignore

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+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build
+output.wav

example/java/app/build.gradle

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+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Kotlin application project to get you started.
+ * For more details on building Java & JVM projects, please refer to https://docs.gradle.org/8.2.1/userguide/building_java_projects.html in the Gradle documentation.
+ */
+
+plugins {
+    // Apply the org.jetbrains.kotlin.jvm Plugin to add support for Kotlin.
+    id 'org.jetbrains.kotlin.jvm' version '1.8.20'
+
+    // Apply the application plugin to add support for building a CLI application in Java.
+    id 'application'
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    // Use the Kotlin JUnit 5 integration.
+    testImplementation 'org.jetbrains.kotlin:kotlin-test-junit5'
+
+    // Use the JUnit 5 integration.
+    testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.9.2'
+
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+
+    implementation("org.jetbrains.kotlinx:kotlinx-cli:0.3.6")
+
+    // TODO: ちゃんと配布したらそれに置き換える
+    implementation files("../../../crates/voicevox_core_java_api/lib/build/libs/lib-0.0.0.jar")
+    // https://mvnrepository.com/artifact/com.google.code.gson/gson
+    implementation group: 'com.google.code.gson', name: 'gson', version: "2.10.1"
+    // https://mvnrepository.com/artifact/jakarta.validation/jakarta.validation-api
+    implementation group: 'jakarta.validation', name: 'jakarta.validation-api', version: "3.0.2"
+    // https://mvnrepository.com/artifact/jakarta.annotation/jakarta.annotation-api
+    implementation group: 'jakarta.annotation', name: 'jakarta.annotation-api', version: "2.1.1"
+    implementation group: 'com.microsoft.onnxruntime', name: 'onnxruntime', version: "1.14.0"
+}
+
+// Apply a specific Java toolchain to ease working on different environments.
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(11)
+    }
+}
+
+application {
+    // Define the main class for the application.
+    mainClass = 'jp.hiroshiba.voicevoxcoreexample.AppKt'
+    tasks.run.workingDir = rootProject.projectDir
+}
+
+tasks.named('test') {
+    // Use JUnit Platform for unit tests.
+    useJUnitPlatform()
+}

example/java/app/src/main/kotlin/jp/hiroshiba/voicevoxcoreexample/App.kt

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+/*
+ * This Kotlin source file was generated by the Gradle 'init' task.
+ */
+package jp.hiroshiba.voicevoxcoreexample
+
+import java.io.File
+import jp.hiroshiba.voicevoxcore.*
+import kotlinx.cli.*
+
+enum class Mode {
+  AUTO,
+  CPU,
+  GPU
+}
+
+fun main(args: Array<String>) {
+  val parser = ArgParser("example")
+  val mode by parser.option(ArgType.Choice<Mode>(), description = "モード").default(Mode.AUTO)
+  val vvmPath by
+      parser.option(ArgType.String, fullName = "vvm", description = "vvmファイルへのパス").required()
+  val dictDir by
+      parser
+          .option(ArgType.String, description = "Open JTalkの辞書ディレクトリ")
+          .default("./open_jtalk_dic_utf_8-1.11")
+  val text by
+      parser
+          .option(ArgType.String, description = "読み上げさせたい文章")
+          .default("この音声は、ボイスボックスを使用して、出力されています。")
+  val out by parser.option(ArgType.String, description = "出力wavファイルのパス").default("./output.wav")
+  val styleId by parser.option(ArgType.Int, description = "話者IDを指定").default(0)
+
+  parser.parse(args)
+
+  println("Inititalizing: ${mode}, ${dictDir}")
+  val openJtalk = OpenJtalk(dictDir)
+  val synthesizer =
+      Synthesizer.builder(openJtalk)
+          .accelerationMode(
+              when (mode) {
+                Mode.AUTO -> Synthesizer.AccelerationMode.AUTO
+                Mode.CPU -> Synthesizer.AccelerationMode.CPU
+                Mode.GPU -> Synthesizer.AccelerationMode.GPU
+              }
+          )
+          .build()
+
+  println("Loading: ${vvmPath}")
+  val vvm = VoiceModel(vvmPath)
+  synthesizer.loadVoiceModel(vvm)
+
+  println("Creating an AudioQuery from the text: ${text}")
+  val audioQuery = synthesizer.createAudioQuery(text, styleId)
+
+  println("Synthesizing... ${audioQuery}")
+  val audio = synthesizer.synthesis(audioQuery, styleId).execute()
+
+  println("Saving the audio to ${out}")
+  File(out).writeBytes(audio)
+}

example/java/app/src/test/kotlin/jp/hiroshiba/voicevoxcoreexample/AppTest.kt

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+/*
+ * This Kotlin source file was generated by the Gradle 'init' task.
+ */
+package jp.hiroshiba.voicevoxcoreexample
+
+import kotlin.test.Test
+import kotlin.test.assertNotNull
+
+class AppTest {
+    @Test fun appHasAGreeting() {
+        val classUnderTest = App()
+        assertNotNull(classUnderTest.greeting, "app should have a greeting")
+    }
+}

example/java/gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.2.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists