1 files changed, 70 insertions, 0 deletions
diff --git a/common/onap-tosca-datatype/src/main/java/org/onap/sdc/tosca/services/StrictMapAppenderConstructor.java b/common/onap-tosca-datatype/src/main/java/org/onap/sdc/tosca/services/StrictMapAppenderConstructor.java
new file mode 100644
index 0000000000..7babd428c8
--- /dev/null
+++ b/common/onap-tosca-datatype/src/main/java/org/onap/sdc/tosca/services/StrictMapAppenderConstructor.java
@@ -0,0 +1,70 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * SDC
+ * ================================================================================
+ * Copyright (C) 2021 AT&T 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.sdc.tosca.services;
+
+import org.yaml.snakeyaml.constructor.Constructor;
+import org.yaml.snakeyaml.nodes.MappingNode;
+import org.yaml.snakeyaml.parser.ParserException;
+
+import java.util.AbstractMap;
+import java.util.Map;
+import java.util.Set;
+
+public class StrictMapAppenderConstructor extends Constructor {
+    /**
+     * Instantiates a new Strict map appender constructor.
+     *
+     * @param theRoot the the root
+     */
+    public StrictMapAppenderConstructor(Class<?> theRoot) {
+        super(theRoot);
+    }
+
+    @Override
+    protected Map<Object, Object> createDefaultMap(int initSize) {
+        final Map<Object, Object> delegate = super.createDefaultMap(initSize);
+        return new AbstractMap<>() {
+            @Override
+            public Object put(Object key, Object value) {
+                if (delegate.containsKey(key)) {
+                    throw new IllegalStateException("duplicate key: " + key);
+                }
+                return delegate.put(key, value);
+            }
+
+            @Override
+            public Set<Entry<Object, Object>> entrySet() {
+                return delegate.entrySet();
+            }
+        };
+    }
+
+    @Override
+    protected Map<Object, Object> constructMapping(MappingNode node) {
+        try {
+            return super.constructMapping(node);
+        } catch (IllegalStateException exception) {
+            throw new ParserException("while parsing MappingNode",
+                    node.getStartMark(), exception.getMessage(),
+                    node.getEndMark());
+        }
+    }
+}