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ktosoktoso
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add a sample
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6 files changed

+198
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‎Samples/JavaDependencySampleApp/Package.swift

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// swift-tools-version: 6.0
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// The swift-tools-version declares the minimum version of Swift required to build this package.
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import CompilerPluginSupport
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import PackageDescription
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import class Foundation.FileManager
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import class Foundation.ProcessInfo
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// Note: the JAVA_HOME environment variable must be set to point to where
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// Java is installed, e.g.,
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// Library/Java/JavaVirtualMachines/openjdk-21.jdk/Contents/Home.
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func findJavaHome() -> String {
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if let home = ProcessInfo.processInfo.environment["JAVA_HOME"] {
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return home
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}
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// This is a workaround for envs (some IDEs) which have trouble with
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// picking up env variables during the build process
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let path = "\(FileManager.default.homeDirectoryForCurrentUser.path()).java_home"
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if let home = try? String(contentsOfFile: path, encoding: .utf8) {
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if let lastChar = home.last, lastChar.isNewline {
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return String(home.dropLast())
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}
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return home
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}
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fatalError("Please set the JAVA_HOME environment variable to point to where Java is installed.")
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}
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let javaHome = findJavaHome()
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let javaIncludePath = "\(javaHome)/include"
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#if os(Linux)
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let javaPlatformIncludePath = "\(javaIncludePath)/linux"
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#elseif os(macOS)
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let javaPlatformIncludePath = "\(javaIncludePath)/darwin"
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#else
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// TODO: Handle windows as well
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#error("Currently only macOS and Linux platforms are supported, this may change in the future.")
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#endif
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let package = Package(
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name: "JavaKitSampleApp",
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platforms: [
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.macOS(.v13),
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.iOS(.v13),
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.tvOS(.v13),
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.watchOS(.v6),
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.macCatalyst(.v13),
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],
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products: [
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.library(
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name: "JavaKitExample",
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type: .dynamic,
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targets: ["JavaKitExample"]
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),
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],
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dependencies: [
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.package(name: "swift-java", path: "../../")
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],
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targets: [
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.target(
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name: "JavaKitExample",
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dependencies: [
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.product(name: "JavaKit", package: "swift-java"),
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.product(name: "JavaKitFunction", package: "swift-java"),
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],
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swiftSettings: [
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.unsafeFlags(["-I\(javaIncludePath)", "-I\(javaPlatformIncludePath)"])
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],
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plugins: [
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.plugin(name: "SwiftJavaPlugin", package: "swift-java"),
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]
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),
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]
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)

‎Samples/JavaDependencySampleApp/Sources/JavaKitExample/JavaKitExample.swift

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//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
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// Licensed under Apache License v2.0
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//
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// See LICENSE.txt for license information
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// See CONTRIBUTORS.txt for the list of Swift.org project authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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//===----------------------------------------------------------------------===//
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import JavaKit
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import JavaKitFunction
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enum SwiftWrappedError: Error {
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case message(String)
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}
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@JavaImplementation("com.example.swift.HelloSwift")
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extension HelloSwift: HelloSwiftNativeMethods {
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@JavaMethod
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func sayHello(_ i: Int32, _ j: Int32) -> Int32 {
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print("Hello from Swift!")
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let answer = self.sayHelloBack(i + j)
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print("Swift got back \(answer) from Java")
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print("We expect the above value to be the initial value, \(self.javaClass.initialValue)")
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print("Updating Java field value to something different")
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self.value = 2.71828
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let newAnswer = self.sayHelloBack(17)
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print("Swift got back updated \(newAnswer) from Java")
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let newHello = HelloSwift(environment: javaEnvironment)
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print("Swift created a new Java instance with the value \(newHello.value)")
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let name = newHello.name
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print("Hello to \(name)")
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newHello.greet("Swift 👋🏽 How's it going")
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self.name = "a 🗑️-collected language"
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_ = self.sayHelloBack(42)
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let predicate: JavaPredicate<JavaInteger> = self.lessThanTen()!
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let value = predicate.test(JavaInteger(3).as(JavaObject.self))
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print("Running a JavaPredicate from swift 3 < 10 = \(value)")
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let strings = doublesToStrings([3.14159, 2.71828])
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print("Converting doubles to strings: \(strings)")
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// Try downcasting
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if let helloSub = self.as(HelloSubclass.self) {
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print("Hello from the subclass!")
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helloSub.greetMe()
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assert(helloSub.value == 2.71828)
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} else {
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fatalError("Expected subclass here")
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}
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// Check "is" behavior
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assert(newHello.is(HelloSwift.self))
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assert(!newHello.is(HelloSubclass.self))
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// Create a new instance.
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let helloSubFromSwift = HelloSubclass("Hello from Swift", environment: javaEnvironment)
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helloSubFromSwift.greetMe()
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do {
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try throwMessage("I am an error")
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} catch {
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print("Caught Java error: \(error)")
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}
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// Make sure that the thread safe class is sendable
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let threadSafe: Sendable = ThreadSafeHelperClass(environment: javaEnvironment)
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return i * j
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}
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@JavaMethod
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func throwMessageFromSwift(_ message: String) throws -> String {
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throw SwiftWrappedError.message(message)
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}
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}

‎Samples/JavaDependencySampleApp/Sources/JavaKitExample/swift-java.config

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{
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"dependencies": [
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"org.reactivestreams:reactive-streams:1.0.4"
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],
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"__FIXME": "we should not need to express this classpath!",
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"classPath": "JavaKit/build/classes/java/main",
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}

‎Samples/JavaDependencySampleApp/ci-validate.sh

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#!/bin/sh
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swift build
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"$JAVA_HOME/bin/java" \
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-cp .build/plugins/outputs/javakitsampleapp/JavaKitExample/destination/JavaCompilerPlugin/Java \
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-Djava.library.path=.build/debug \
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"com.example.swift.JavaKitSampleMain"

‎Sources/Java2Swift/JavaToSwift+FetchDependencies.swift

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import JavaKitConfigurationShared
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extension JavaToSwift {
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func fetchDependencies(projectName: String,
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func fetchDependencies(moduleName: String,
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dependencies: [JavaDependencyDescriptor],
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baseClasspath: [String]) throws -> JavaClasspath {
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let deps = dependencies.map { $0.descriptionGradleStyle }
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projectBaseDirectory: URL(fileURLWithPath: ".").path,
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dependencies: deps)
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let entryCount = classpath.split(separator: ":").count
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print("[debug][swift-java] Resolved classpath for \(deps.count) dependencies: classpath entries: \(entryCount)... ", terminator: "")
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let entries = classpath.split(separator: ":")
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let entryCount = entries.count
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print("[info][swift-java] Resolved classpath for \(deps.count) dependencies of '\(moduleName)': classpath entries: \(entryCount)... ", terminator: "")
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print("done.".green)
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for entry in entries {
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print("[debug][swift-java] Classpath entry: \(entry)")
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}
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return .init(classpath)
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}
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}

‎Sources/Java2Swift/JavaToSwift.swift

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toolMode = .classWrappers(config)
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}
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let moduleName = self.moduleName ??
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input.split(separator: "/").dropLast().last.map(String.init) ??
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"__UnknownModule"
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// Load all of the dependent configurations and associate them with Swift
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// modules.
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let dependentConfigs = try dependsOn.map { dependentConfig in
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case .fetchDependencies(let config):
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let dependencies = config.dependencies! // TODO: cleanup how we do config
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try fetchDependencies(dependencies: dependencies, baseClasspath: classPathPieces)
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try fetchDependencies(moduleName: moduleName, dependencies: dependencies, baseClasspath: classPathPieces)
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}
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}
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