add base class ConstraintViolationException

Author: greenrobot

objectbox-java/src/main/java/io/objectbox/exception/ConstraintViolationException.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2017 ObjectBox Ltd. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.objectbox.exception;
+
+/** Base class for exceptions thrown when a constraint would be violated during a put operation. */
+public class ConstraintViolationException extends DbException {
+    public ConstraintViolationException(String message) {
+        super(message);
+    }
+}

objectbox-java/src/main/java/io/objectbox/exception/UniqueViolationException.java

@@ -17,7 +17,7 @@
 package io.objectbox.exception;
 
 /** Thrown when a @{@link io.objectbox.annotation.Unique} constraint would be violated during a put operation. */
-public class UniqueViolationException extends DbException {
+public class UniqueViolationException extends ConstraintViolationException {
     public UniqueViolationException(String message) {
         super(message);
     }