carloseduardosx · January 18, 2021 05:35 · Jun 15, 2016 · Jun 15, 2016 · Jun 15, 2016 · Jun 15, 2016
diff --git a/RealmAutoIncrement.java b/RealmAutoIncrement.java
@@ -1,3 +1,5 @@
+package com.carlosedurdo.database;
+
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicInteger;

diff --git a/RealmAutoIncrement.java b/RealmAutoIncrement.java
@@ -1,5 +1,3 @@
-package com.greenmile.driver.database;
-
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicInteger;

diff --git a/RealmAutoIncrement.java b/RealmAutoIncrement.java
@@ -1,8 +1,5 @@
 package com.greenmile.driver.database;
 
-import android.provider.BaseColumns;
-import android.util.Log;
-
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -43,9 +40,6 @@ private int getLastIdFromModel(Class<? extends RealmObject> clazz) {
         String primaryKeyColumnName = "id";
         Number lastId = realm.where(clazz).max(primaryKeyColumnName);
 
-        if (lastId != null) {
-            Log.i("RealmAutoIncrement", "getLastIdFromModel: " + lastId.intValue());
-        }
         return lastId == null ? 0 : lastId.intValue();
     }
 
@@ -64,10 +58,8 @@ public Integer getNextIdFromModel(Class<? extends RealmObject> clazz) {
             AtomicInteger modelId = modelMap.get(clazz);
 
             if (modelId == null) {
-                Log.i("RealmAutoIncrement", "No model mapped to: " + clazz.getSimpleName());
                 return 0;
             }
-
             return modelId.incrementAndGet();
         }
         return null;

diff --git a/RealmAutoIncrement.java b/RealmAutoIncrement.java
@@ -39,8 +39,9 @@ private RealmAutoIncrement() {
      * @return The last id saved from model passed
      */
     private int getLastIdFromModel(Class<? extends RealmObject> clazz) {
-
-        Number lastId = realm.where(clazz).max(BaseColumns._ID);
+
+        String primaryKeyColumnName = "id";
+        Number lastId = realm.where(clazz).max(primaryKeyColumnName);
 
         if (lastId != null) {
             Log.i("RealmAutoIncrement", "getLastIdFromModel: " + lastId.intValue());

diff --git a/RealmAutoIncrement.java b/RealmAutoIncrement.java
@@ -0,0 +1,102 @@
+package com.greenmile.driver.database;
+
+import android.provider.BaseColumns;
+import android.util.Log;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import io.realm.Realm;
+import io.realm.RealmObject;
+
+/**
+ * Implementation of Auto Increment feature for Realm
+ * RealmAutoIncrement is a singleton which maintain the last id saved from each database model.
+ *
+ * To get next id from anyone model, simple call the method getNextIdFromModel.
+ * @see #getNextIdFromModel(Class)
+ */
+public final class RealmAutoIncrement {
+
+    private Realm realm;
+    private Map<Class<? extends RealmObject>, AtomicInteger> modelMap = new HashMap<>();
+    private static RealmAutoIncrement autoIncrementMap;
+
+    private RealmAutoIncrement() {
+    }
+
+    {
+        realm = Realm.getDefaultInstance();
+        modelMap.put(SampleModel.class, new AtomicInteger(getLastIdFromModel(SampleModel.class)));
+    }
+
+    /**
+     * Utility method which query for all models saved and get the bigger model id saved
+     * Used to guarantee which the last model id saved is really the last
+     *
+     * @param clazz Model which should get the last id
+     * @return The last id saved from model passed
+     */
+    private int getLastIdFromModel(Class<? extends RealmObject> clazz) {
+
+        Number lastId = realm.where(clazz).max(BaseColumns._ID);
+
+        if (lastId != null) {
+            Log.i("RealmAutoIncrement", "getLastIdFromModel: " + lastId.intValue());
+        }
+        return lastId == null ? 0 : lastId.intValue();
+    }
+
+    /**
+     * Search in modelMap for the last saved id from model passed and return the next one
+     *
+     * @param clazz Model to search the last id
+     * @return The next id which can be saved in database for that model, 
+     * {@code null} will be returned when this method is called by reflection
+     */
+    public Integer getNextIdFromModel(Class<? extends RealmObject> clazz) {
+
+
+        if (isValidMethodCall()) {
+
+            AtomicInteger modelId = modelMap.get(clazz);
+
+            if (modelId == null) {
+                Log.i("RealmAutoIncrement", "No model mapped to: " + clazz.getSimpleName());
+                return 0;
+            }
+
+            return modelId.incrementAndGet();
+        }
+        return null;
+    }
+
+    /**
+     * Utility method to validate if the method is called from reflection,
+     * in this case is considered a not valid call otherwise is a valid call
+     *
+     * @return The boolean which define if the method call is valid or not
+     */
+    private boolean isValidMethodCall() {
+
+        StackTraceElement[] stackTraceElements = Thread.currentThread().getStackTrace();
+
+        for (StackTraceElement stackTraceElement : stackTraceElements) {
+
+            if (stackTraceElement.getMethodName().equals("newInstance")) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    public static RealmAutoIncrement getInstance() {
+
+        if (autoIncrementMap == null) {
+            autoIncrementMap = new RealmAutoIncrement();
+        }
+
+        return autoIncrementMap;
+    }
+}
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