Added Jackson Engine and updated tests

Signed-off-by: Patrick Adamek <[email protected]>

pom.xml

@@ -114,6 +114,16 @@
       <artifactId>argon2-jvm</artifactId>
       <version>2.10.1</version>
     </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-databind</artifactId>
+      <version>2.13.0</version>
+    </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.datatype</groupId>
+      <artifactId>jackson-datatype-jdk8</artifactId>
+      <version>2.13.0</version>
+    </dependency>
     <dependency>
       <groupId>org.graalvm.sdk</groupId>
       <artifactId>graal-sdk</artifactId>

src/main/java/io/vlingo/xoom/common/serialization/GsonJsonSerialization.java

@@ -0,0 +1,162 @@
+package io.vlingo.xoom.common.serialization;
+
+import com.google.gson.*;
+import com.google.gson.reflect.TypeToken;
+
+import java.lang.reflect.Type;
+import java.time.*;
+import java.util.Collection;
+import java.util.Date;
+import java.util.List;
+
+import static io.vlingo.xoom.common.serialization.JsonSerialization.PATTERN;
+
+class GsonJsonSerialization implements JsonSerializationEngine {
+
+    private final Gson gson;
+
+    {
+        gson = new GsonBuilder()
+                .registerTypeAdapter(Class.class, new GsonJsonSerialization.ClassSerializer())
+                .registerTypeAdapter(Class.class, new GsonJsonSerialization.ClassDeserializer())
+                .registerTypeAdapter(Date.class, new GsonJsonSerialization.DateSerializer())
+                .registerTypeAdapter(Date.class, new GsonJsonSerialization.DateDeserializer())
+                .registerTypeAdapter(LocalDate.class, new GsonJsonSerialization.LocalDateSerializer())
+                .registerTypeAdapter(LocalDate.class, new GsonJsonSerialization.LocalDateDeserializer())
+                .registerTypeAdapter(LocalDateTime.class, new GsonJsonSerialization.LocalDateTimeSerializer())
+                .registerTypeAdapter(LocalDateTime.class, new GsonJsonSerialization.LocalDateTimeDeserializer())
+                .registerTypeAdapter(OffsetDateTime.class, new GsonJsonSerialization.OffsetDateTimeSerializer())
+                .registerTypeAdapter(OffsetDateTime.class, new GsonJsonSerialization.OffsetDateTimeDeserializer())
+                .create();
+    }
+
+    @Override
+    public <T> T deserialized(String serialization, final Class<T> type) {
+        T instance = gson.fromJson(serialization, type);
+        return instance;
+    }
+
+    @Override
+    public <T> T deserialized(String serialization, final Type type) {
+        T instance = gson.fromJson(serialization, type);
+        return instance;
+    }
+
+    @Override
+    public <T> List<T> deserializedList(String serialization, final Type listOfType) {
+        final List<T> list = gson.fromJson(serialization, listOfType);
+        return list;
+    }
+
+    @Override
+    public String serialized(final Object instance) {
+        final String serialization = gson.toJson(instance);
+        return serialization;
+    }
+
+    @Override
+    public <T> String serialized(final Collection<T> instance) {
+        final Type collectionOfT = new TypeToken<Collection<T>>() {
+        }.getType();
+        final String serialization = gson.toJson(instance, collectionOfT);
+        return serialization;
+    }
+
+    @Override
+    public <T> String serialized(final List<T> instance) {
+        final Type listOfT = new TypeToken<List<T>>() {
+        }.getType();
+        final String serialization = gson.toJson(instance, listOfT);
+        return serialization;
+    }
+
+    @SuppressWarnings("rawtypes")
+    private static class ClassSerializer implements JsonSerializer<Class> {
+        @Override
+        public JsonElement serialize(Class source, Type typeOfSrc, JsonSerializationContext context) {
+            return new JsonPrimitive(source.getName());
+        }
+    }
+
+    @SuppressWarnings("rawtypes")
+    private static class ClassDeserializer implements JsonDeserializer<Class> {
+        @Override
+        public Class deserialize(JsonElement json, Type typeOfTarget, JsonDeserializationContext context) throws JsonParseException {
+            final String classname = json.getAsJsonPrimitive().getAsString();
+            try {
+                return Class.forName(classname);
+            } catch (ClassNotFoundException e) {
+                throw new JsonParseException(e);
+            }
+        }
+    }
+
+    private static class DateSerializer implements JsonSerializer<Date> {
+        @Override
+        public JsonElement serialize(Date source, Type typeOfSource, JsonSerializationContext context) {
+            return new JsonPrimitive(Long.toString(source.getTime()));
+        }
+    }
+
+    private static class DateDeserializer implements JsonDeserializer<Date> {
+        @Override
+        public Date deserialize(JsonElement json, Type typeOfTarget, JsonDeserializationContext context) throws JsonParseException {
+            long time = Long.parseLong(json.getAsJsonPrimitive().getAsString());
+            return new Date(time);
+        }
+    }
+
+    private static class LocalDateSerializer implements JsonSerializer<LocalDate> {
+        public JsonElement serialize(LocalDate source, Type typeOfSource, JsonSerializationContext context) {
+            return new JsonPrimitive(Long.toString(source.toEpochDay()));
+        }
+    }
+
+    private static class LocalDateDeserializer implements JsonDeserializer<LocalDate> {
+        public LocalDate deserialize(JsonElement json, Type typeOfTarget, JsonDeserializationContext context) throws JsonParseException {
+            if (isNumericString(json.getAsJsonPrimitive().getAsString())) {
+                final long epochDay = Long.parseLong(json.getAsJsonPrimitive().getAsString());
+                return LocalDate.ofEpochDay(epochDay);
+            }
+
+            return LocalDate.parse(json.getAsJsonPrimitive().getAsString());
+        }
+    }
+
+    private static class LocalDateTimeSerializer implements JsonSerializer<LocalDateTime> {
+        public JsonElement serialize(final LocalDateTime source, Type typeOfSource, JsonSerializationContext context) {
+            return new JsonPrimitive(Long.toString(source.atZone(ZoneOffset.UTC).toInstant().toEpochMilli()));
+        }
+    }
+
+    private static class LocalDateTimeDeserializer implements JsonDeserializer<LocalDateTime> {
+        public LocalDateTime deserialize(JsonElement json, Type typeOfTarget, JsonDeserializationContext context) throws JsonParseException {
+            if (isNumericString(json.getAsJsonPrimitive().getAsString())) {
+                final long milli = Long.parseLong(json.getAsJsonPrimitive().getAsString());
+                return LocalDateTime.ofInstant(Instant.ofEpochMilli(milli), ZoneOffset.UTC);
+            }
+
+            return LocalDateTime.parse(json.getAsJsonPrimitive().getAsString());
+        }
+    }
+
+    private static class OffsetDateTimeSerializer implements JsonSerializer<OffsetDateTime> {
+        @Override
+        public JsonElement serialize(OffsetDateTime source, Type typeOfSource, JsonSerializationContext context) {
+            return new JsonPrimitive(source.toInstant().toEpochMilli() + ";" + source.getOffset().toString());
+        }
+    }
+
+    private static class OffsetDateTimeDeserializer implements JsonDeserializer<OffsetDateTime> {
+        @Override
+        public OffsetDateTime deserialize(JsonElement json, Type typeOfTarget, JsonDeserializationContext context) throws JsonParseException {
+            final String[] encoding = json.getAsJsonPrimitive().getAsString().split(";");
+            final Date date = new Date(Long.parseLong(encoding[0]));
+            return date.toInstant().atOffset(ZoneOffset.of(encoding[1]));
+        }
+    }
+
+    private static boolean isNumericString(String element) {
+        return PATTERN.matcher(element).matches();
+    }
+}