1 files changed, 93 insertions, 0 deletions
diff --git a/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoderObject.java b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoderObject.java
new file mode 100644
index 00000000..60c5f4ef
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/coder/StandardCoderObject.java
@@ -0,0 +1,93 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 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.policy.common.utils.coder;
+
+import com.google.gson.JsonElement;
+
+/**
+ * Object type used by the {@link StandardCoder}. Different serialization tools have
+ * different "standard objects". For instance, GSON uses {@link JsonElement}. This class
+ * wraps that object so that it can be used without exposing the object, itself.
+ */
+public class StandardCoderObject {
+
+    /**
+     * Data wrapped by this.
+     */
+    private final JsonElement data;
+
+    /**
+     * Constructs the object.
+     */
+    public StandardCoderObject() {
+        data = null;
+    }
+
+    /**
+     * Constructs the object.
+     *
+     * @param data data wrapped by this object.
+     */
+    protected StandardCoderObject(JsonElement data) {
+        this.data = data;
+    }
+
+    /**
+     * Gets the data wrapped by this.
+     *
+     * @return the data wrapped by this
+     */
+    protected JsonElement getData() {
+        return data;
+    }
+
+    /**
+     * Gets a field's value from this object, traversing the object hierarchy.
+     *
+     * @param fields field hierarchy
+     * @return the field value or {@code null} if the field does not exist or is not a
+     *         primitive
+     */
+    public String getString(String... fields) {
+
+        /*
+         * This could be relatively easily modified to allow Integer arguments, as well,
+         * which would be used to specify indices within an array.
+         */
+
+        JsonElement jel = data;
+
+        for (String field : fields) {
+            if (jel == null) {
+                return null;
+            }
+
+            if (jel.isJsonObject()) {
+                jel = jel.getAsJsonObject().get(field);
+
+            } else {
+                return null;
+            }
+        }
+
+        return (jel != null && jel.isJsonPrimitive() ? jel.getAsString() : null);
+    }
+}