From 366d8edab3cff1f315ff8889d6efca509c31c560 Mon Sep 17 00:00:00 2001
From: Fabrice Lecomte <fabrice.lecomte.be@gmail.com>
Date: Fri, 31 May 2019 15:14:36 +0200
Subject: [PATCH] Add Serializer

---
 .../kotlin/fr/postgresjson/entity/Entity.kt   | 16 +++++
 .../fr/postgresjson/serializer/Serializer.kt  | 23 ++++++++
 .../postgresjson/serializer/SerializerTest.kt | 59 +++++++++++++++++++
 3 files changed, 98 insertions(+)
 create mode 100644 src/main/kotlin/fr/postgresjson/entity/Entity.kt
 create mode 100644 src/main/kotlin/fr/postgresjson/serializer/Serializer.kt
 create mode 100644 src/test/kotlin/fr/postgresjson/serializer/SerializerTest.kt

diff --git a/src/main/kotlin/fr/postgresjson/entity/Entity.kt b/src/main/kotlin/fr/postgresjson/entity/Entity.kt
new file mode 100644
index 0000000..bc0cea7
--- /dev/null
+++ b/src/main/kotlin/fr/postgresjson/entity/Entity.kt
@@ -0,0 +1,16 @@
+package fr.postgresjson.entity
+
+import java.util.*
+
+interface EntityI<T> {
+    var id: T
+}
+abstract class Entity<T>(override var id: T) : EntityI<T>
+abstract class UuidEntity(override var id: UUID = UUID.randomUUID()) : Entity<UUID>(id) {}
+abstract class IdEntity(override var id: Int) : Entity<Int>(id)
+
+interface EntityVersioning<T> {
+    var version: T
+}
+
+interface EntityVersioningIncrement : EntityVersioning<Int>
diff --git a/src/main/kotlin/fr/postgresjson/serializer/Serializer.kt b/src/main/kotlin/fr/postgresjson/serializer/Serializer.kt
new file mode 100644
index 0000000..ad9ddab
--- /dev/null
+++ b/src/main/kotlin/fr/postgresjson/serializer/Serializer.kt
@@ -0,0 +1,23 @@
+package fr.postgresjson.serializer
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import com.fasterxml.jackson.module.kotlin.readValue
+import fr.postgresjson.entity.Entity
+
+class Serializer(val mapper: ObjectMapper = jacksonObjectMapper()) {
+    fun serialize(source: Any): String {
+        return mapper.writeValueAsString(source)
+    }
+
+    inline fun <reified T>deserialize(json: String): T {
+        return mapper.readValue(json)
+    }
+
+    inline fun <reified T>deserialize(json: String, target: T): T {
+        return mapper.readerForUpdating(target).readValue(json)
+    }
+}
+
+fun <T> Entity<T>.serialize() = Serializer().serialize(this)
+inline fun <reified T> T.deserialize(json: String) = Serializer().deserialize(json, this)
\ No newline at end of file
diff --git a/src/test/kotlin/fr/postgresjson/serializer/SerializerTest.kt b/src/test/kotlin/fr/postgresjson/serializer/SerializerTest.kt
new file mode 100644
index 0000000..710de6a
--- /dev/null
+++ b/src/test/kotlin/fr/postgresjson/serializer/SerializerTest.kt
@@ -0,0 +1,59 @@
+package fr.postgresjson.serializer
+
+import fr.postgresjson.entity.UuidEntity
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+internal class SerializerTest {
+    class ObjTest(var val1: String, var val2: Int) : UuidEntity()
+
+    private val serializer = Serializer()
+
+    private val objSerialized = """{"val1":"plop","val2":123,"id":"1362a162-df75-4995-ab46-4ad55fa07de2"}"""
+    private val objSerializedUpdate = """{"val1":"update","val2":123}"""
+    private lateinit var obj: ObjTest
+
+    @BeforeEach
+    fun before() {
+        obj = ObjTest("plop", 123)
+    }
+
+    @Test
+    fun serialize() {
+        val json = serializer.serialize(obj)
+        assertTrue(json.contains("\"val1\":\"plop\",\"val2\":123"))
+    }
+
+    @Test
+    fun serialize2() {
+        val json = obj.serialize()
+        assertTrue(json.contains("\"val1\":\"plop\",\"val2\":123"))
+    }
+
+    @Test
+    fun deserialize() {
+        val objDeserialized: ObjTest = serializer.deserialize(objSerialized)
+        assertEquals(obj.val1, objDeserialized.val1)
+        assertEquals(obj.val2, objDeserialized.val2)
+    }
+
+    @Test
+    fun deserializeUpdate() {
+        val objDeserialized: ObjTest = serializer.deserialize(objSerializedUpdate, obj)
+        assertTrue(obj === objDeserialized)
+        assertEquals("update", objDeserialized.val1)
+        assertEquals(123, objDeserialized.val2)
+    }
+
+    @Test
+    fun deserializeUpdate2() {
+        val objDeserialized: ObjTest = obj.deserialize(objSerializedUpdate)
+        assertTrue(obj === objDeserialized)
+        assertEquals("update", objDeserialized.val1)
+        assertEquals(123, objDeserialized.val2)
+    }
+}
\ No newline at end of file