#41 Added EnumBiMap (#42)

vityaman-edu · Apr 11, 2024 · c3577b1 · c3577b1
1 parent 8a77770
commit c3577b1
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Showing 5 changed files with 75 additions and 56 deletions.
diff --git a/botalka/src/main/kotlin/ru/itmo/lms/botalka/api/http/message/PromotionMapping.kt b/botalka/src/main/kotlin/ru/itmo/lms/botalka/api/http/message/PromotionMapping.kt
@@ -2,6 +2,8 @@ package ru.itmo.lms.botalka.api.http.message
 
 import ru.itmo.lms.botalka.api.http.PromotionRequestMessage
 import ru.itmo.lms.botalka.api.http.PromotionRequestStatusMessage
+import ru.itmo.lms.botalka.commons.BiMap
+import ru.itmo.lms.botalka.commons.BiMap.Companion.invoke
 import ru.itmo.lms.botalka.domain.model.PromotionRequest
 
 fun PromotionRequest.toMessage(): PromotionRequestMessage =
@@ -12,32 +14,14 @@ fun PromotionRequest.toMessage(): PromotionRequestMessage =
         status = this.status.toMessage(),
     )
 
-fun PromotionRequest.Status.toMessage(): PromotionRequestStatusMessage =
-    when (this) {
-        PromotionRequest.Status.CREATED -> {
-            PromotionRequestStatusMessage.NEW
-        }
-
-        PromotionRequest.Status.REJECTED -> {
-            PromotionRequestStatusMessage.CANCELED
-        }
+private val statusMap = BiMap.from(
+    PromotionRequest.Status.CREATED to PromotionRequestStatusMessage.NEW,
+    PromotionRequest.Status.REJECTED to PromotionRequestStatusMessage.CANCELED,
+    PromotionRequest.Status.APPROVED to PromotionRequestStatusMessage.APPROVED,
+)
 
-        PromotionRequest.Status.APPROVED -> {
-            PromotionRequestStatusMessage.APPROVED
-        }
-    }
+fun PromotionRequest.Status.toMessage(): PromotionRequestStatusMessage =
+    statusMap(this)
 
 fun PromotionRequestStatusMessage.toModel(): PromotionRequest.Status =
-    when (this) {
-        PromotionRequestStatusMessage.NEW -> {
-            PromotionRequest.Status.CREATED
-        }
-
-        PromotionRequestStatusMessage.APPROVED -> {
-            PromotionRequest.Status.APPROVED
-        }
-
-        PromotionRequestStatusMessage.CANCELED -> {
-            PromotionRequest.Status.REJECTED
-        }
-    }
+    statusMap(this)
diff --git a/botalka/src/main/kotlin/ru/itmo/lms/botalka/api/http/message/UserMapping.kt b/botalka/src/main/kotlin/ru/itmo/lms/botalka/api/http/message/UserMapping.kt
@@ -3,20 +3,10 @@ package ru.itmo.lms.botalka.api.http.message
 import ru.itmo.lms.botalka.api.http.UserDraftMessage
 import ru.itmo.lms.botalka.api.http.UserMessage
 import ru.itmo.lms.botalka.api.http.UserRoleMessage
+import ru.itmo.lms.botalka.commons.BiMap
+import ru.itmo.lms.botalka.commons.BiMap.Companion.invoke
 import ru.itmo.lms.botalka.domain.model.User
 
-fun User.Role.toMessage(): UserRoleMessage =
-    when (this) {
-        User.Role.TEACHER -> UserRoleMessage.TEACHER
-        User.Role.STUDENT -> UserRoleMessage.STUDENT
-    }
-
-fun UserRoleMessage.toModel(): User.Role =
-    when (this) {
-        UserRoleMessage.STUDENT -> User.Role.STUDENT
-        UserRoleMessage.TEACHER -> User.Role.TEACHER
-    }
-
 fun User.toMessage(): UserMessage =
     UserMessage(
         id = this.id.number,
@@ -40,3 +30,14 @@ fun UserMessage.toModel(): User =
         alias = User.Alias(this.alias),
         roles = this.roles.map { it.toModel() }.toSet(),
     )
+
+private val userRoleMap = BiMap.from(
+    User.Role.TEACHER to UserRoleMessage.TEACHER,
+    User.Role.STUDENT to UserRoleMessage.STUDENT,
+)
+
+fun User.Role.toMessage(): UserRoleMessage =
+    userRoleMap(this)
+
+fun UserRoleMessage.toModel(): User.Role =
+    userRoleMap(this)
diff --git a/botalka/src/main/kotlin/ru/itmo/lms/botalka/commons/BiMap.kt b/botalka/src/main/kotlin/ru/itmo/lms/botalka/commons/BiMap.kt
@@ -0,0 +1,33 @@
+package ru.itmo.lms.botalka.commons
+
+import java.util.EnumMap
+
+interface BiMap<T, U> {
+    fun toRight(value: T): U
+    fun toLeft(value: U): T
+
+    companion object {
+        inline fun <reified T : Enum<T>, reified U : Enum<U>> from(
+            vararg pairs: Pair<T, U>,
+        ): BiMap<T, U> =
+            object : BiMap<T, U> {
+                private val rhs = pairs
+                    .associateTo(EnumMap(T::class.java)) { (l, r) -> l to r }
+
+                private val lhs = pairs
+                    .associateTo(EnumMap(U::class.java)) { (l, r) -> r to l }
+
+                override fun toRight(value: T): U = rhs[value]!!
+
+                override fun toLeft(value: U): T = lhs[value]!!
+            }
+
+        @JvmName("BiMapLeftToRight")
+        operator fun <T, U> BiMap<T, U>.invoke(value: T): U =
+            this.toRight(value)
+
+        @JvmName("BiMapRightToLeft")
+        operator fun <T, U> BiMap<T, U>.invoke(value: U): T =
+            this.toLeft(value)
+    }
+}
diff --git a/botalka/src/main/kotlin/ru/itmo/lms/botalka/storage/jooq/entity/PromotionMapping.kt b/botalka/src/main/kotlin/ru/itmo/lms/botalka/storage/jooq/entity/PromotionMapping.kt
@@ -1,5 +1,7 @@
 package ru.itmo.lms.botalka.storage.jooq.entity
 
+import ru.itmo.lms.botalka.commons.BiMap
+import ru.itmo.lms.botalka.commons.BiMap.Companion.invoke
 import ru.itmo.lms.botalka.domain.model.PromotionRequest
 import ru.itmo.lms.botalka.domain.model.User
 import ru.itmo.lms.botalka.storage.jooq.enums.PromotionRequestStatus
@@ -13,16 +15,14 @@ fun PromotionRequestRecord.toModel(): PromotionRequest =
         status = this.status!!.toModel(),
     )
 
+private val statusMap = BiMap.from(
+    PromotionRequest.Status.CREATED to PromotionRequestStatus.created,
+    PromotionRequest.Status.REJECTED to PromotionRequestStatus.rejected,
+    PromotionRequest.Status.APPROVED to PromotionRequestStatus.approved,
+)
+
 fun PromotionRequestStatus.toModel(): PromotionRequest.Status =
-    when (this) {
-        PromotionRequestStatus.created -> PromotionRequest.Status.CREATED
-        PromotionRequestStatus.rejected -> PromotionRequest.Status.REJECTED
-        PromotionRequestStatus.approved -> PromotionRequest.Status.APPROVED
-    }
+    statusMap(this)
 
 fun PromotionRequest.Status.toRecord(): PromotionRequestStatus =
-    when (this) {
-        PromotionRequest.Status.CREATED -> PromotionRequestStatus.created
-        PromotionRequest.Status.REJECTED -> PromotionRequestStatus.rejected
-        PromotionRequest.Status.APPROVED -> PromotionRequestStatus.approved
-    }
+    statusMap(this)
diff --git a/botalka/src/main/kotlin/ru/itmo/lms/botalka/storage/jooq/entity/UserMapping.kt b/botalka/src/main/kotlin/ru/itmo/lms/botalka/storage/jooq/entity/UserMapping.kt
@@ -1,5 +1,7 @@
 package ru.itmo.lms.botalka.storage.jooq.entity
 
+import ru.itmo.lms.botalka.commons.BiMap
+import ru.itmo.lms.botalka.commons.BiMap.Companion.invoke
 import ru.itmo.lms.botalka.domain.model.User
 import ru.itmo.lms.botalka.storage.jooq.enums.Role
 import ru.itmo.lms.botalka.storage.jooq.tables.records.UserRecord
@@ -16,14 +18,13 @@ fun User.Draft.toRecord(): UserRecord =
         alias = this.alias.text,
     )
 
+private val userRoleMap = BiMap.from(
+    User.Role.TEACHER to Role.teacher,
+    User.Role.STUDENT to Role.student,
+)
+
 fun User.Role.toRecord(): Role =
-    when (this) {
-        User.Role.TEACHER -> Role.teacher
-        User.Role.STUDENT -> Role.student
-    }
+    userRoleMap(this)
 
 fun Role.toModel(): User.Role =
-    when (this) {
-        Role.teacher -> User.Role.TEACHER
-        Role.student -> User.Role.STUDENT
-    }
+    userRoleMap(this)