From 12de015db4e638b8fee5a157b06f9571b142492d Mon Sep 17 00:00:00 2001
From: Denis Karmyshakov <Denis.Karmyshakov@gmail.com>
Date: Thu, 6 Jul 2017 19:50:30 +0300
Subject: [PATCH] Storable with Set

---
 .../googlejson/GoogleJsonPreferences.java     | 47 +++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/src/main/java/ru/touchin/templates/googlejson/GoogleJsonPreferences.java b/src/main/java/ru/touchin/templates/googlejson/GoogleJsonPreferences.java
index 75a2708..cd1e6d6 100644
--- a/src/main/java/ru/touchin/templates/googlejson/GoogleJsonPreferences.java
+++ b/src/main/java/ru/touchin/templates/googlejson/GoogleJsonPreferences.java
@@ -29,7 +29,9 @@ import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.lang.reflect.Type;
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 
 import ru.touchin.roboswag.components.utils.storables.PreferenceStore;
 import ru.touchin.roboswag.core.observables.storable.Converter;
@@ -83,6 +85,26 @@ public final class GoogleJsonPreferences {
                 .build();
     }
 
+    @NonNull
+    public static <T> Storable<String, Set<T>, String> jsonSetStorable(@NonNull final String name,
+                                                                       @NonNull final Class<T> jsonItemClass,
+                                                                       @NonNull final SharedPreferences preferences) {
+        return new Storable.Builder<>(name, Set.class, String.class, new PreferenceStore<>(preferences), new JsonSetConverter<>(jsonItemClass))
+                .setObserveStrategy(Storable.ObserveStrategy.CACHE_ACTUAL_VALUE)
+                .build();
+    }
+
+    @NonNull
+    public static <T> NonNullStorable<String, Set<T>, String> jsonSetStorable(@NonNull final String name,
+                                                                              @NonNull final Class<T> jsonItemClass,
+                                                                              @NonNull final SharedPreferences preferences,
+                                                                              @NonNull final Set<T> defaultValue) {
+        return new Storable.Builder<>(name, Set.class, String.class, new PreferenceStore<>(preferences), new JsonSetConverter<>(jsonItemClass))
+                .setObserveStrategy(Storable.ObserveStrategy.CACHE_ACTUAL_VALUE)
+                .setDefaultValue(defaultValue)
+                .build();
+    }
+
     private GoogleJsonPreferences() {
     }
 
@@ -146,4 +168,29 @@ public final class GoogleJsonPreferences {
 
     }
 
+    public static class JsonSetConverter<T> extends JsonConverter<Set<T>> {
+
+        @NonNull
+        private final Class<T> itemClass;
+
+        public JsonSetConverter(@NonNull final Class<T> itemClass) {
+            super();
+            this.itemClass = itemClass;
+        }
+
+        @Nullable
+        @Override
+        public Set<T> toObject(@NonNull final Type jsonObjectType, @NonNull final Type stringType, @Nullable final String storeValue) {
+            if (storeValue == null) {
+                return null;
+            }
+            try {
+                return new HashSet<>(GoogleJsonModel.DEFAULT_JSON_FACTORY.createJsonParser(storeValue).parseArray(HashSet.class, itemClass));
+            } catch (final IOException exception) {
+                throw new ShouldNotHappenException(exception);
+            }
+        }
+
+    }
+
 }