Adding a findAll(KClass) function to DestinationPlugins. This matches the API already present in Analytics. (#199)

Author: didiergarcia

core/src/main/java/com/segment/analytics/kotlin/core/platform/Plugin.kt

@@ -9,6 +9,7 @@ import com.segment.analytics.kotlin.core.ScreenEvent
 import com.segment.analytics.kotlin.core.Settings
 import com.segment.analytics.kotlin.core.TrackEvent
 import com.segment.analytics.kotlin.core.utilities.getBoolean
+import kotlin.reflect.KClass
 
 // Most simple interface for an plugin
 interface Plugin {
@@ -105,6 +106,13 @@ abstract class DestinationPlugin : EventPlugin {
         timeline.remove(plugin)
     }
 
+    /**
+     * Find all Plugins matching the given class that have been added to this Destination Plugin.
+     */
+    fun <T: Plugin> findAll(pluginClass: KClass<T>): List<T> {
+        return timeline.findAll(pluginClass)
+    }
+
     /**
      * Update `enabled` state of destination and apply settings update to destination timeline
      * We recommend calling `super.update(..., ...) in case this function is overridden

core/src/test/kotlin/com/segment/analytics/kotlin/core/platform/plugins/DestinationPluginTests.kt

@@ -180,4 +180,54 @@ class DestinationPluginTests {
         val result = destinationPlugin.process(trackEvent)
         assertEquals(null, result)
     }
+
+    @Test
+    fun `findAll will find single added plugin`() {
+        val destinationPlugin = object: DestinationPlugin() {
+            override val key: String = "TestDestination"
+        }
+
+        timeline.add(destinationPlugin)
+        var simplePlugins = destinationPlugin.findAll(SimplePlugin::class)
+        assertTrue(simplePlugins.isEmpty())
+
+        val testPlugin = SimplePlugin("Test1")
+        destinationPlugin.add(testPlugin)
+        simplePlugins = destinationPlugin.findAll(SimplePlugin::class)
+
+        assertTrue(simplePlugins.isNotEmpty())
+        assertEquals(1, simplePlugins.size)
+        assertEquals(testPlugin, simplePlugins.get(0))
+    }
+
+    @Test
+    fun `findAll will find multiple added plugin`() {
+        val destinationPlugin = object: DestinationPlugin() {
+            override val key: String = "TestDestination"
+        }
+
+        timeline.add(destinationPlugin)
+        var simplePlugins = destinationPlugin.findAll(SimplePlugin::class)
+        assertTrue(simplePlugins.isEmpty())
+
+        val testPlugin1 = SimplePlugin("Test1")
+        val testPlugin2 = SimplePlugin("Test2")
+        val testPlugin3 = SimplePlugin("Test3")
+
+        destinationPlugin.add(testPlugin1)
+        destinationPlugin.add(testPlugin2)
+        destinationPlugin.add(testPlugin3)
+        simplePlugins = destinationPlugin.findAll(SimplePlugin::class)
+
+        assertTrue(simplePlugins.isNotEmpty())
+        assertEquals(3, simplePlugins.size)
+        assertEquals(testPlugin1, simplePlugins.get(0))
+        assertEquals(testPlugin2, simplePlugins.get(1))
+        assertEquals(testPlugin3, simplePlugins.get(2))
+    }
+
+    class SimplePlugin(var name: String) : Plugin {
+        override val type: Plugin.Type = Plugin.Type.Enrichment
+        override lateinit var analytics: Analytics
+    }
 }