Use Guice injector and ServiceLocator to load implementations on the fly

1 files changed, 58 insertions, 0 deletions

diff --git a/src/Utilities/GuiceModule.kt b/src/Utilities/GuiceModule.kt
new file mode 100644
index 00000000..4ce4863d
--- /dev/null
+++ b/src/Utilities/GuiceModule.kt
@@ -0,0 +1,58 @@
+package org.jetbrains.dokka.Utilities
+
+import com.google.inject.Binder
+import com.google.inject.Module
+import com.google.inject.Provider
+import com.google.inject.name.Names
+import org.jetbrains.dokka.*
+import org.jetbrains.dokka.Formats.FormatDescriptor
+import java.io.File
+
+class GuiceModule(val config: DokkaGenerator) : Module {
+    override fun configure(binder: Binder) {
+        binder.bind(javaClass<DokkaGenerator>()).toInstance(config)
+        binder.bind(javaClass<File>()).annotatedWith(Names.named("outputDir")).toInstance(File(config.outputDir))
+
+        binder.bindNameAnnotated<LocationService, SingleFolderLocationService>("singleFolder")
+        binder.bindNameAnnotated<FileLocationService, SingleFolderLocationService>("singleFolder")
+        binder.bindNameAnnotated<LocationService, FoldersLocationService>("folders")
+        binder.bindNameAnnotated<FileLocationService, FoldersLocationService>("folders")
+
+        // defaults
+        binder.bind(javaClass<LocationService>()).to(javaClass<FoldersLocationService>())
+        binder.bind(javaClass<FileLocationService>()).to(javaClass<FoldersLocationService>())
+        binder.bind(javaClass<LanguageService>()).to(javaClass<KotlinLanguageService>())
+
+        binder.bind(javaClass<HtmlTemplateService>()).toProvider(object : Provider<HtmlTemplateService> {
+            override fun get(): HtmlTemplateService = HtmlTemplateService.default("/dokka/styles/style.css")
+        })
+
+        binder.registerCategory<LanguageService>("language")
+        binder.registerCategory<OutlineFormatService>("outline")
+        binder.registerCategory<FormatService>("format")
+        binder.registerCategory<Generator>("generator")
+
+        val descriptor = ServiceLocator.lookup<FormatDescriptor>("format", config.outputFormat, config)
+
+        descriptor.outlineServiceClass?.let { clazz ->
+            binder.bind(javaClass<OutlineFormatService>()).to(clazz)
+        }
+        descriptor.formatServiceClass?.let { clazz ->
+            binder.bind(javaClass<FormatService>()).to(clazz)
+        }
+        binder.bind(javaClass<Generator>()).to(descriptor.generatorServiceClass)
+    }
+
+}
+
+private inline fun <reified T> Binder.registerCategory(category: String) {
+    ServiceLocator.allServices(category).forEach {
+        @suppress("UNCHECKED_CAST")
+        bind(javaClass<T>()).annotatedWith(Names.named(it.name)).to(javaClass<T>().classLoader.loadClass(it.className) as Class<T>)
+    }
+}
+
+private inline fun <reified Base, reified T : Base> Binder.bindNameAnnotated(name: String) {
+    bind(javaClass<Base>()).annotatedWith(Names.named(name)).to(javaClass<T>())
+}
+