implemented kotlin declarative extensions in ext module

Author: gotev

README.md

@@ -37,7 +37,7 @@ In this way every item of the recycler view has its own set of files, resulting
 ## <a name="setup"></a>Setup
 In your gradle dependencies add:
 ```groovy
-def recyclerAdapterVersion = "2.6.2" // change it with the version you want to use
+def recyclerAdapterVersion = "2.7.0" // change it with the version you want to use
 implementation "net.gotev:recycleradapter:$recyclerAdapterVersion"
 ```
 This is the latest version: [ ![Download](https://api.bintray.com/packages/gotev/maven/recycler-adapter/images/download.svg) ](https://bintray.com/gotev/maven/recycler-adapter/_latestVersion)

manifest.gradle

@@ -9,14 +9,14 @@ ext {
     library_licenses = ["Apache-2.0"]
     library_licenses_url = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
     library_project_group = 'net.gotev'
-    library_version = '2.6.2'
+    library_version = '2.7.0'
     version_code = 5
     min_sdk = 18
     target_sdk = 28
     demo_app_id = 'net.gotev.recycleradapterdemo'
 
     // Gradle classpath dependencies versions
-    kotlin_version = '1.3.21'
+    kotlin_version = '1.3.41'
     gradle_version = '3.3.2'
     maven_gradle_version = '2.1'
     gradle_versions_plugin_version = '0.20.0'
@@ -37,9 +37,9 @@ ext {
     androidx_appcompat_version = '1.0.2'
 
     // App dependencies
-    okhttp_version = '3.13.1'
+    okhttp_version = '3.14.2'
     retrofit_version = '2.5.0'
-    rxjava2_version = '2.2.7'
+    rxjava2_version = '2.2.10'
     rxkotlin_version = '2.3.0'
     rxandroid_version = '2.1.1'
 

recycleradapter-extensions/src/main/java/net/gotev/recycleradapter/ext/DeclarativeExtensions.kt

@@ -0,0 +1,88 @@
+package net.gotev.recycleradapter.ext
+
+import net.gotev.recycleradapter.AdapterItem
+import net.gotev.recycleradapter.RecyclerAdapter
+
+/**
+ * @author Aleksandar Gotev
+ */
+
+typealias AdapterItems = ArrayList<AdapterItem<*>>
+
+fun createRecyclerAdapterWith(vararg items: AdapterItem<*>?): RecyclerAdapter {
+    return RecyclerAdapter().apply {
+        val filtered = items.filterNotNull()
+        if (filtered.isNotEmpty()) {
+            add(filtered)
+        }
+    }
+}
+
+fun createRecyclerAdapterWith(list: List<AdapterItem<*>?>?): RecyclerAdapter {
+    return RecyclerAdapter().apply {
+        val filtered = list?.filterNotNull() ?: emptyList()
+        if (filtered.isNotEmpty()) {
+            add(filtered)
+        }
+    }
+}
+
+fun listOfAdapterItems(vararg items: AdapterItem<*>?): AdapterItems {
+    return if (items.isEmpty()) {
+        ArrayList(1)
+    } else {
+        ArrayList(items.filterNotNull())
+    }
+}
+
+fun AdapterItems.adding(item: AdapterItem<*>?): AdapterItems {
+    return if (item == null) {
+        this
+    } else {
+        apply { add(item) }
+    }
+}
+
+fun adapterItems(vararg items: AdapterItem<*>?): AdapterItems {
+    return ArrayList(listOfNotNull(*items))
+}
+
+inline fun <T> Iterable<T>.mapItems(transform: (T) -> AdapterItem<*>?): Array<AdapterItem<*>> {
+    return mapNotNull(transform).toTypedArray()
+}
+
+inline fun <K, V> Map<out K, V>.mapToManyAdapterItems(transform: (Map.Entry<K, V>) -> List<AdapterItem<*>>): Array<AdapterItem<*>> {
+    return map(transform).flatten().toTypedArray()
+}
+
+inline fun <T> Iterable<T>.createRecyclerAdapterByMapping(transform: (T) -> AdapterItem<*>?): RecyclerAdapter {
+    return RecyclerAdapter().add(mapToAdapterItems(transform))
+}
+
+inline fun <T> Iterable<T>.mapToAdapterItems(transform: (T) -> AdapterItem<*>?): AdapterItems {
+    return ArrayList(mapNotNull(transform))
+}
+
+interface RecyclerAdapterProvider {
+    val recyclerAdapter: RecyclerAdapter
+
+    fun AdapterItems.render() {
+        recyclerAdapter.syncWithItems(this)
+    }
+
+    fun render(vararg items: AdapterItem<*>?) {
+        renderList(items.filterNotNull())
+    }
+
+    fun render(list: List<AdapterItem<*>?>?) {
+        renderList(list?.filterNotNull() ?: emptyList())
+    }
+
+    private fun renderList(list: List<AdapterItem<*>>) {
+        if (list.isEmpty()) {
+            recyclerAdapter.clear()
+        } else {
+            ArrayList(list).render()
+        }
+    }
+}