1 files changed, 37 insertions, 0 deletions
diff --git a/sdc-workflow-designer-be/src/main/java/org/onap/sdc/workflow/api/validation/NoDuplicatesValidator.java b/sdc-workflow-designer-be/src/main/java/org/onap/sdc/workflow/api/validation/NoDuplicatesValidator.java
new file mode 100644
index 00000000..7ade1ab0
--- /dev/null
+++ b/sdc-workflow-designer-be/src/main/java/org/onap/sdc/workflow/api/validation/NoDuplicatesValidator.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright © 2018 European Support Limited
+ *
+ * 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 org.onap.sdc.workflow.api.validation;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import javax.validation.ConstraintValidator;
+import javax.validation.ConstraintValidatorContext;
+import org.onap.sdc.workflow.api.types.Parameter;
+
+public class NoDuplicatesValidator implements ConstraintValidator<NoDuplicates, Collection<Parameter>> {
+
+    @Override
+    public boolean isValid(Collection<Parameter> parameters, ConstraintValidatorContext context) {
+        if (Objects.isNull(parameters) || parameters.size() < 2) {
+            return true;
+        }
+        Set<String> testSet = new HashSet<>();
+        return parameters.stream().allMatch(parameter -> testSet.add(parameter.getName()));
+    }
+}