filter realm management

app/src/main/java/net/pokeranalytics/android/model/realm/Filter.kt

@@ -4,6 +4,7 @@ import io.realm.MutableRealmInteger
 import io.realm.RealmList
 import io.realm.RealmObject
 import io.realm.annotations.PrimaryKey
+import net.pokeranalytics.android.ui.view.rowrepresentable.FilterElement
 import java.util.*
 
 //import net.pokeranalytics.android.FilterComponent
@@ -21,6 +22,34 @@ open class Filter : RealmObject() {
     // for MutableRealmInteger, see https://realm.io/docs/java/latest/#counters
     val usageCount: MutableRealmInteger = MutableRealmInteger.valueOf(0)
 
-    var components: RealmList<FilterComponent>? = null
-
+    var components: RealmList<FilterComponent> = RealmList()
+
+    fun componentsFrom(filterElements: ArrayList<FilterElement>) {
+
+        components.clear()
+
+        var sections = filterElements.mapNotNull {
+            it.filterSection
+        }.distinct()
+
+        sections.forEach { section ->
+            var _filterElements = filterElements.filter {
+                it.filterSection?.let { _section ->
+                    _section == section
+                } ?: run {
+                    false
+                }
+            }
+
+            if (_filterElements.size == 1) {
+                var component : FilterComponent = FilterComponent(_filterElements.first())
+                components.add(component)
+            } else {
+                var casted = arrayListOf<FilterElement>()
+                casted.addAll(_filterElements)
+                var component : FilterComponent = FilterComponent(casted)
+                components.add(component)
+            }
+        }
+    }
 }