Initial commit with standard lib, might be used a example of cake

1 files changed, 74 insertions, 0 deletions

diff --git a/src/main/scala/com/drivergrp/core/messages.scala b/src/main/scala/com/drivergrp/core/messages.scala
new file mode 100644
index 0000000..cf0bb6c
--- /dev/null
+++ b/src/main/scala/com/drivergrp/core/messages.scala
@@ -0,0 +1,74 @@
+package com.drivergrp.core
+
+
+import java.util.Locale
+
+import com.drivergrp.core.config.ConfigModule
+import com.drivergrp.core.logging.{Logger, LoggerModule}
+
+import scala.collection.JavaConverters._
+import scala.collection.concurrent.TrieMap
+
+/**
+  * Scala internationalization (i18n) support
+  */
+object messages {
+
+  trait MessagesModule {
+
+    def messages: Messages
+  }
+
+  trait ConfigMessagesModule extends MessagesModule {
+    this: ConfigModule with LoggerModule =>
+
+    private val loadedFromConfig = new TrieMap[Locale, Messages]()
+    val locale: Locale = Locale.US
+
+    val messages: Messages = {
+      loadedFromConfig.getOrElseUpdate(locale, {
+        val map = config.getConfig(locale.getISO3Language).root().unwrapped().asScala.mapValues(_.toString).toMap
+        Messages(map, locale, log)
+      })
+    }
+  }
+
+
+  case class Messages(map: Map[String, String], locale: Locale, log: Logger) {
+
+    /**
+      * Returns message for the key
+      *
+      * @param key key
+      * @return message
+      */
+    def apply(key: String): String = {
+      map.get(key) match {
+        case Some(message) => message
+        case None =>
+          log.error(s"Message with key $key not found for locale " + locale.getDisplayName)
+          key
+      }
+    }
+
+    /**
+      * Returns message for the key and formats that with parameters
+      *
+      * @example "Hello {0}!" with "Joe" will be "Hello Joe!"
+      *
+      * @param key key
+      * @param params params to be embedded
+      * @return formatted message
+      */
+    def apply(key: String, params: Any*): String = {
+
+      def format(formatString: String, params: Seq[Any]) =
+        params.zipWithIndex.foldLeft(formatString) {
+          case (res, (value, index)) => res.replaceAll(s"{$index}", value.toString)
+        }
+
+      val template = apply(key)
+      format(template, params)
+    }
+  }
+}
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