From 5d989661f3e9eccd88cf0745b14ef5403dd47c64 Mon Sep 17 00:00:00 2001
From: mikr <michael.krimgen@ximedes.com>
Date: Tue, 23 Apr 2019 09:09:01 +0200
Subject: [PATCH] BAEL-2580 JVM Platform Annotations in Kotlin

---
 .../com/baeldung/jvmannotations/Document.kt   | 31 +++++++++
 .../baeldung/jvmannotations/HtmlDocument.java |  9 +++
 .../com/baeldung/jvmannotations/Message.kt    | 66 +++++++++++++++++++
 .../jvmannotations/MessageConverter.kt        |  6 ++
 4 files changed, 112 insertions(+)
 create mode 100644 core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/Document.kt
 create mode 100644 core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/HtmlDocument.java
 create mode 100644 core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/Message.kt
 create mode 100644 core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/MessageConverter.kt

diff --git a/core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/Document.kt b/core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/Document.kt
new file mode 100644
index 0000000000..3f9922b88b
--- /dev/null
+++ b/core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/Document.kt
@@ -0,0 +1,31 @@
+package com.baeldung.jvmannotations
+
+import java.util.*
+
+interface Document {
+
+    @JvmDefault
+    fun getType() = "document"
+}
+
+class TextDocument : Document {
+    override fun getType() = "text"
+
+    fun transformList(list : List<Number>) : List<Number> {
+        return list.filter { n -> n.toInt() > 1 }
+    }
+
+    fun transformListInverseWildcards(list : List<@JvmSuppressWildcards Number>) : List<@JvmWildcard Number> {
+        return list.filter { n -> n.toInt() > 1 }
+    }
+
+    var list : List<@JvmWildcard Any> = ArrayList()
+}
+
+class XmlDocument(d : Document) : Document by d
+
+fun main() {
+    val myDocument = TextDocument()
+    val myTextDocument = XmlDocument(myDocument)
+    println("${myDocument.getType()} ${myTextDocument.getType()}")
+}
diff --git a/core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/HtmlDocument.java b/core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/HtmlDocument.java
new file mode 100644
index 0000000000..feb71772cb
--- /dev/null
+++ b/core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/HtmlDocument.java
@@ -0,0 +1,9 @@
+package com.baeldung.jvmannotations;
+
+public class HtmlDocument implements Document {
+
+    @Override
+    public String getType() {
+        return "HTML";
+    }
+}
\ No newline at end of file
diff --git a/core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/Message.kt b/core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/Message.kt
new file mode 100644
index 0000000000..80180bd924
--- /dev/null
+++ b/core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/Message.kt
@@ -0,0 +1,66 @@
+@file:JvmName("MessageHelper")
+@file:JvmMultifileClass //used
+package com.baeldung.jvmannotations
+
+import java.util.*
+
+@JvmName("getMyUsername")
+fun getMyName() : String {
+    return "myUserId"
+}
+
+object MessageBroker {
+    @JvmStatic
+    var totalMessagesSent = 0
+
+    const val maxMessageLength = 0
+
+    @JvmStatic
+    fun clearAllMessages() {
+    }
+
+    @JvmStatic
+    @JvmOverloads
+    @Throws(Exception::class)
+    fun findMessages(sender : String, type : String = "text", maxResults : Int = 10) : List<Message> {
+        if(sender.isEmpty()) {
+            throw Exception()
+        }
+        return ArrayList()
+    }
+}
+
+class Message {
+
+    // this would cause a compilation error since sender is immutable
+    // @set:JvmName("setSender")
+    val sender = "myself"
+
+    // this works as name is overridden
+    @JvmName("getSenderName")
+    fun getSender() : String = "from:$sender"
+
+    @get:JvmName("getReceiverName")
+    @set:JvmName("setReceiverName")
+    var receiver : String = ""
+
+    @get:JvmName("getContent")
+    @set:JvmName("setContent")
+    var text = ""
+
+    // generates a warning
+    @get:JvmName("getId")
+    private val id = 0
+
+    @get:JvmName("hasAttachment")
+    var hasAttachment = true
+
+    var isEncrypted = true
+
+    fun setReceivers(receiverNames : List<String>) {
+    }
+
+    @JvmName("setReceiverIds")
+    fun setReceivers(receiverNames : List<Int>) {
+    }
+}
\ No newline at end of file
diff --git a/core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/MessageConverter.kt b/core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/MessageConverter.kt
new file mode 100644
index 0000000000..3b19b12e10
--- /dev/null
+++ b/core-kotlin/src/main/kotlin/com/baeldung/jvmannotations/MessageConverter.kt
@@ -0,0 +1,6 @@
+@file:JvmMultifileClass
+@file:JvmName("MessageHelper") //applies to all top level functions / variables / constants
+package com.baeldung.jvmannotations
+
+fun convert(message: Message) {
+}