1 files changed, 52 insertions, 0 deletions
diff --git a/dmaap-bc/src/main/java/org/onap/dmaap/dbcapi/resources/RequiredChecker.java b/dmaap-bc/src/main/java/org/onap/dmaap/dbcapi/resources/RequiredChecker.java
new file mode 100644
index 0000000..52646aa
--- /dev/null
+++ b/dmaap-bc/src/main/java/org/onap/dmaap/dbcapi/resources/RequiredChecker.java
@@ -0,0 +1,52 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PNF-REGISTRATION-HANDLER
+ * ================================================================================
+ * Copyright (C) 2019 NOKIA Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.dmaap.dbcapi.resources;
+
+import static javax.ws.rs.core.Response.Status.BAD_REQUEST;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.onap.dmaap.dbcapi.model.ApiError;
+
+public class RequiredChecker {
+
+    public void required(String name, Object val) throws RequiredFieldException {
+        if (val == null) {
+            throw new RequiredFieldException(new ApiError(BAD_REQUEST.getStatusCode(),
+                    "missing required field", name));
+        }
+    }
+
+    public void required(String name, String val, String expr) throws RequiredFieldException {
+
+        required(name, val);
+
+        if (expr != null && !expr.isEmpty()) {
+            Pattern pattern = Pattern.compile(expr);
+            Matcher matcher = pattern.matcher(val);
+            if (!matcher.find()) {
+                throw new RequiredFieldException(new ApiError(BAD_REQUEST.getStatusCode(),
+                        "value '" + val + "' violates regexp check '" + expr + "'", name));
+            }
+        }
+    }
+
+}