11 files changed, 211 insertions, 0 deletions
diff --git a/src/main/kotlin/com/romangraef/jrconfig/Config.kt b/src/main/kotlin/com/romangraef/jrconfig/Config.kt
new file mode 100644
index 0000000..7641689
--- /dev/null
+++ b/src/main/kotlin/com/romangraef/jrconfig/Config.kt
@@ -0,0 +1,55 @@
+package com.romangraef.jrconfig
+
+import com.romangraef.jrconfig.variables.IntegerVariable
+import com.romangraef.jrconfig.variables.StringVariable
+
+typealias ConfigVariableProvider<T> = (ConfigProvider, String) -> ConfigVariable<T>
+
+object Config {
+    private var configProvider: ConfigProvider? = null
+    private val map: MutableMap<Class<*>, ConfigVariableProvider<*>> = mutableMapOf()
+    private val proxyProvider: ConfigProvider = object : ConfigProvider {
+
+        override fun provideData(point: String): String? =
+            configProvider?.provideData(point)
+
+
+        override fun setData(point: String, data: String) =
+            configProvider?.setData(point, data) ?: Unit
+    }
+
+    init {
+        map[Int::class.java] = ::IntegerVariable
+        map[String::class.java] = ::StringVariable
+    }
+
+
+    @Suppress("UNCHECKED_CAST")
+    @JvmStatic
+    fun <T> get(clazz: Class<out T>, point: String): ConfigVariable<T> {
+        return (map[clazz] as? ConfigVariableProvider<T>)?.invoke(proxyProvider, point)
+            ?: throw ConfigMissingProviderException(clazz)
+    }
+
+    inline fun <reified T> get(point: String) = get(T::class.java, point)
+
+    @JvmStatic
+    fun <T> registerConfigVariableProvider(clazz: Class<T>, provider: ConfigVariableProvider<T>) {
+        map[clazz] = provider
+    }
+
+    inline fun <reified T> registerConfigVariableProvider(noinline provider: ConfigVariableProvider<T>) =
+        registerConfigVariableProvider(T::class.java, provider)
+
+
+    @JvmStatic
+    fun use(provider: ConfigProvider?) {
+        configProvider = provider
+    }
+
+    @JvmStatic
+    fun getString(point: String): ConfigVariable<String> {
+        return get(String::class.java, point)
+    }
+
+}
+\ No newline at end of file
diff --git a/src/main/kotlin/com/romangraef/jrconfig/ConfigMissingException.kt b/src/main/kotlin/com/romangraef/jrconfig/ConfigMissingException.kt
new file mode 100644
index 0000000..1b609f9
--- /dev/null
+++ b/src/main/kotlin/com/romangraef/jrconfig/ConfigMissingException.kt
@@ -0,0 +1,5 @@
+package com.romangraef.jrconfig
+
+class ConfigMissingException(val point: String) : RuntimeException("The point $point is missing from your config.") {
+
+}
diff --git a/src/main/kotlin/com/romangraef/jrconfig/ConfigMissingProviderException.kt b/src/main/kotlin/com/romangraef/jrconfig/ConfigMissingProviderException.kt
new file mode 100644
index 0000000..4cf03b8
--- /dev/null
+++ b/src/main/kotlin/com/romangraef/jrconfig/ConfigMissingProviderException.kt
@@ -0,0 +1,4 @@
+package com.romangraef.jrconfig
+
+class ConfigMissingProviderException(val clazz: Class<*>) :
+    RuntimeException("You are missing a config provider for the type ${clazz.canonicalName}")
diff --git a/src/main/kotlin/com/romangraef/jrconfig/ConfigProvider.kt b/src/main/kotlin/com/romangraef/jrconfig/ConfigProvider.kt
new file mode 100644
index 0000000..019cdef
--- /dev/null
+++ b/src/main/kotlin/com/romangraef/jrconfig/ConfigProvider.kt
@@ -0,0 +1,6 @@
+package com.romangraef.jrconfig
+
+interface ConfigProvider {
+    fun provideData(point: String): String?
+    fun setData(point: String, data: String)
+}
+\ No newline at end of file
diff --git a/src/main/kotlin/com/romangraef/jrconfig/ConfigVariable.kt b/src/main/kotlin/com/romangraef/jrconfig/ConfigVariable.kt
new file mode 100644
index 0000000..5874e76
--- /dev/null
+++ b/src/main/kotlin/com/romangraef/jrconfig/ConfigVariable.kt
@@ -0,0 +1,6 @@
+package com.romangraef.jrconfig
+
+interface ConfigVariable<T> {
+    fun get(): T
+    fun set(value: T)
+}
+\ No newline at end of file
diff --git a/src/main/kotlin/com/romangraef/jrconfig/FilePropertiesProvider.kt b/src/main/kotlin/com/romangraef/jrconfig/FilePropertiesProvider.kt
new file mode 100644
index 0000000..fda7bf9
--- /dev/null
+++ b/src/main/kotlin/com/romangraef/jrconfig/FilePropertiesProvider.kt
@@ -0,0 +1,45 @@
+package com.romangraef.jrconfig
+
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileOutputStream
+import java.io.IOException
+import java.util.*
+
+class FilePropertiesProvider(private val file: File) : ConfigProvider {
+    private var properties: Properties = Properties()
+
+    init {
+        try {
+            properties.load(FileInputStream(file))
+        } catch (e: IOException) {
+            e.printStackTrace()
+        }
+    }
+
+    companion object {
+        @JvmStatic
+        fun create(fileName: String): ConfigProvider {
+            return FilePropertiesProvider(File(fileName))
+        }
+    }
+
+    override fun provideData(point: String): String? {
+        return properties.getProperty(point)
+    }
+
+    override fun setData(point: String, data: String) {
+        properties.setProperty(point, data)
+        save()
+    }
+
+    private fun save() {
+        try {
+            properties.store(FileOutputStream(file), "application config")
+        } catch (e: IOException) {
+            e.printStackTrace()
+        }
+    }
+
+
+}
+\ No newline at end of file
diff --git a/src/main/kotlin/com/romangraef/jrconfig/TransformerConfigVariable.kt b/src/main/kotlin/com/romangraef/jrconfig/TransformerConfigVariable.kt
new file mode 100644
index 0000000..ae38409
--- /dev/null
+++ b/src/main/kotlin/com/romangraef/jrconfig/TransformerConfigVariable.kt
@@ -0,0 +1,41 @@
+package com.romangraef.jrconfig
+
+import java.util.function.Function
+
+abstract class TransformerConfigVariable<T>(private val provider: ConfigProvider, private val point: String) :
+    ConfigVariable<T> {
+    protected abstract fun transform(value: String): T
+    protected abstract fun serialize(data: T): String
+
+    override fun get(): T {
+        return transform(provider.provideData(point) ?: throw ConfigMissingException(point))
+    }
+
+
+    override fun set(value: T) =
+        provider.setData(point, serialize(value))
+
+
+    companion object {
+        /**
+         * Quick and dirty. Please consider using a subclass.
+         */
+        fun <T> getVariable(
+            provider: ConfigProvider,
+            point: String,
+            transform: Function<String, T>,
+            serialize: Function<T, String>
+        ): TransformerConfigVariable<T> {
+            return object : TransformerConfigVariable<T>(provider, point) {
+                override fun transform(value: String): T {
+                    return transform.apply(value)
+                }
+
+                override fun serialize(data: T): String {
+                    return serialize.apply(data)
+                }
+            }
+        }
+    }
+
+}
+\ No newline at end of file
diff --git a/src/main/kotlin/com/romangraef/jrconfig/variables/IntegerVariable.kt b/src/main/kotlin/com/romangraef/jrconfig/variables/IntegerVariable.kt
new file mode 100644
index 0000000..97cd719
--- /dev/null
+++ b/src/main/kotlin/com/romangraef/jrconfig/variables/IntegerVariable.kt
@@ -0,0 +1,15 @@
+package com.romangraef.jrconfig.variables
+
+import com.romangraef.jrconfig.ConfigProvider
+import com.romangraef.jrconfig.TransformerConfigVariable
+
+class IntegerVariable(provider: ConfigProvider, point: String) :
+    TransformerConfigVariable<Int>(provider, point) {
+    override fun transform(value: String): Int {
+        return value.toInt()
+    }
+
+    override fun serialize(data: Int): String {
+        return data.toString()
+    }
+}
+\ No newline at end of file
diff --git a/src/main/kotlin/com/romangraef/jrconfig/variables/StringVariable.kt b/src/main/kotlin/com/romangraef/jrconfig/variables/StringVariable.kt
new file mode 100644
index 0000000..62ee801
--- /dev/null
+++ b/src/main/kotlin/com/romangraef/jrconfig/variables/StringVariable.kt
@@ -0,0 +1,15 @@
+package com.romangraef.jrconfig.variables
+
+import com.romangraef.jrconfig.ConfigProvider
+import com.romangraef.jrconfig.TransformerConfigVariable
+
+class StringVariable(provider: ConfigProvider, point: String) :
+    TransformerConfigVariable<String>(provider, point) {
+    override fun transform(value: String): String {
+        return value
+    }
+
+    override fun serialize(data: String): String {
+        return data
+    }
+}
+\ No newline at end of file
diff --git a/src/test/java/com/romangraef/jrconfig/Main.java b/src/test/java/com/romangraef/jrconfig/Main.java
new file mode 100644
index 0000000..28dc9ec
--- /dev/null
+++ b/src/test/java/com/romangraef/jrconfig/Main.java
@@ -0,0 +1,11 @@
+package com.romangraef.jrconfig;
+
+public class Main {
+
+    public static ConfigVariable<String> token = Config.getString("token");
+
+    public static void main(String[] args) {
+        Config.use(FilePropertiesProvider.create("config.properties"));
+        System.out.println(token.get());
+    }
+}
diff --git a/src/test/kotlin/com/romangraef/jrconfig/MainKt.kt b/src/test/kotlin/com/romangraef/jrconfig/MainKt.kt
new file mode 100644
index 0000000..504b446
--- /dev/null
+++ b/src/test/kotlin/com/romangraef/jrconfig/MainKt.kt
@@ -0,0 +1,8 @@
+package com.romangraef.jrconfig
+
+val token = Config.get<String>("token")
+
+fun main() {
+    Config.use(FilePropertiesProvider.create("config.properties"))
+    println(token.get())
+}
+\ No newline at end of file