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hapi-fhir-jpaserver-base/src/main/java/ca/uhn/fhir/jpa/util/SpringObjectCaster.java

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+
+package ca.uhn.fhir.jpa.util;
+
+/*-
+ * #%L
+ * HAPI FHIR JPA Server
+ * %%
+ * Copyright (C) 2014 - 2018 University Health Network
+ * %%
+ * 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.
+ * #L%
+ */
+
+import org.springframework.aop.framework.Advised;
+import org.springframework.aop.support.AopUtils;
+
+/**
+ * Utility to get the Spring proxy object's target object
+ */
+public class SpringObjectCaster {
+
+    /**
+     * Retrieve the Spring proxy object's target object
+     * @param proxy
+     * @param clazz
+     * @param <T>
+     * @return
+     * @throws Exception
+     */
+    public static <T> T getTargetObject(Object proxy, Class<T> clazz) throws Exception {
+        while( (AopUtils.isJdkDynamicProxy(proxy))) {
+            return clazz.cast(getTargetObject(((Advised)proxy).getTargetSource().getTarget(), clazz));
+        }
+
+        return clazz.cast(proxy);
+    }
+}