Merge http4k

persistance/src/main/kotlin/users/UserRepositoryImpl.kt

@@ -0,0 +1,26 @@
+package be.simplenotes.persistance.users
+
+import be.simplenotes.domain.model.PersistedUser
+import be.simplenotes.domain.model.User
+import be.simplenotes.domain.usecases.repositories.UserRepository
+import me.liuwj.ktorm.database.*
+import me.liuwj.ktorm.dsl.*
+import me.liuwj.ktorm.entity.*
+import java.sql.SQLIntegrityConstraintViolationException
+
+internal class UserRepositoryImpl(private val db: Database) : UserRepository {
+    override fun create(user: User): PersistedUser? {
+        return try {
+            db.useTransaction { db.users.add(user.toEntity()) }
+            find(user.username)
+        } catch (e: SQLIntegrityConstraintViolationException) {
+            null
+        }
+    }
+
+    override fun find(username: String) = db.users.find { it.username eq username }?.toPersistedUser()
+    override fun find(id: Int) = db.users.find { it.id eq id }?.toPersistedUser()
+    override fun exists(username: String) = db.users.any { it.username eq username }
+    override fun exists(id: Int) = db.users.any { it.id eq id }
+    override fun delete(id: Int) = db.useTransaction { db.users.find { it.id eq id }?.delete() == 1 }
+}