1 files changed, 98 insertions, 0 deletions
diff --git a/cps-rest/src/main/java/org/onap/cps/rest/exceptions/CpsRestExceptionHandler.java b/cps-rest/src/main/java/org/onap/cps/rest/exceptions/CpsRestExceptionHandler.java
new file mode 100644
index 000000000..9cf4935d4
--- /dev/null
+++ b/cps-rest/src/main/java/org/onap/cps/rest/exceptions/CpsRestExceptionHandler.java
@@ -0,0 +1,98 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2020 Pantheon.tech
+ *  ================================================================================
+ *  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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.rest.exceptions;
+
+import org.apache.commons.lang3.exception.ExceptionUtils;
+import org.hibernate.exception.ConstraintViolationException;
+import org.onap.cps.exceptions.CpsException;
+import org.onap.cps.exceptions.CpsNotFoundException;
+import org.onap.cps.exceptions.CpsValidationException;
+import org.onap.cps.rest.controller.CpsRestController;
+import org.springframework.dao.EmptyResultDataAccessException;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice(assignableTypes = {CpsRestController.class})
+public class CpsRestExceptionHandler {
+
+    /**
+     * Default exception handler.
+     *
+     * @param exception the exception to handle
+     * @return response with response code 500.
+     */
+    @ExceptionHandler
+    public ResponseEntity<Object> handleInternalErrorException(Exception exception) {
+        return buildErrorResponse(HttpStatus.INTERNAL_SERVER_ERROR, exception);
+    }
+
+    /*
+        TODO: Rid off extra dependencies.
+
+        Generic exception handler and CpsException (incl. children) are the only
+        exceptions to be handled here. All the other exceptions which require a special
+        treatment should be rethrown as CpsException in the place of occurrence ->
+        e.g. persistence exceptions are to be handled in cps-ri module.
+     */
+
+    @ExceptionHandler({ConstraintViolationException.class})
+    public ResponseEntity<Object> handleBadRequestException(Exception exception) {
+        return buildErrorResponse(HttpStatus.BAD_REQUEST, exception);
+    }
+
+    @ExceptionHandler({EmptyResultDataAccessException.class})
+    public ResponseEntity<Object> handleNotFoundException(Exception exception) {
+        return buildErrorResponse(HttpStatus.NOT_FOUND, exception);
+    }
+
+    @ExceptionHandler({CpsException.class})
+    public ResponseEntity<Object> handleCpsException(CpsException exception) {
+        return buildErrorResponse(HttpStatus.INTERNAL_SERVER_ERROR, exception.getMessage(), extractDetails(exception));
+    }
+
+    @ExceptionHandler({CpsValidationException.class})
+    public ResponseEntity<Object> handleCpsValidationException(CpsException exception) {
+        return buildErrorResponse(HttpStatus.BAD_REQUEST, exception.getMessage(), extractDetails(exception));
+    }
+
+    @ExceptionHandler({CpsNotFoundException.class})
+    public ResponseEntity<Object> handleCpsNotFoundException(CpsException exception) {
+        return buildErrorResponse(HttpStatus.NOT_FOUND, exception.getMessage(), extractDetails(exception));
+    }
+
+    private static ResponseEntity<Object> buildErrorResponse(HttpStatus status, Exception exception) {
+        return buildErrorResponse(status, exception.getMessage(), ExceptionUtils.getStackTrace(exception));
+    }
+
+    private static ResponseEntity<Object> buildErrorResponse(HttpStatus status, String message, String details) {
+        return new ResponseEntity<>(
+            ErrorMessage.builder().status(status.toString()).message(message).details(details).build(),
+            status
+        );
+    }
+
+    private static String extractDetails(CpsException exception) {
+        return exception.getCause() == null
+            ? exception.getDetails()
+            : ExceptionUtils.getStackTrace(exception.getCause());
+    }
+}