1 files changed, 58 insertions, 0 deletions
diff --git a/gson/src/main/java/org/onap/policy/common/gson/InstantAsMillisTypeAdapter.java b/gson/src/main/java/org/onap/policy/common/gson/InstantAsMillisTypeAdapter.java
new file mode 100644
index 00000000..6bcfaac3
--- /dev/null
+++ b/gson/src/main/java/org/onap/policy/common/gson/InstantAsMillisTypeAdapter.java
@@ -0,0 +1,58 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2020 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.gson;
+
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonToken;
+import com.google.gson.stream.JsonWriter;
+import java.io.IOException;
+import java.time.Instant;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * GSON Type Adapter for "Instant" fields, that encodes them as milliseconds.
+ */
+public class InstantAsMillisTypeAdapter extends TypeAdapter<Instant> {
+
+    @Override
+    public void write(JsonWriter out, Instant value) throws IOException {
+        if (value == null) {
+            out.nullValue();
+        } else {
+            long epochMillis = TimeUnit.MILLISECONDS.convert(value.getEpochSecond(), TimeUnit.SECONDS);
+            long nanoMillis = TimeUnit.MILLISECONDS.convert(value.getNano(), TimeUnit.NANOSECONDS);
+            long millis = epochMillis + nanoMillis;
+            out.value(millis);
+        }
+    }
+
+    @Override
+    public Instant read(JsonReader in) throws IOException {
+        if (in.peek() == JsonToken.NULL) {
+            in.nextNull();
+            return null;
+        } else {
+            long millis = in.nextLong();
+            return Instant.ofEpochMilli(millis);
+        }
+    }
+}