From 3bf33999e41d0603a339d39b0dfc62023acc22bd Mon Sep 17 00:00:00 2001
From: Infendro <infendro@noreply.infendro.com>
Date: Thu, 2 Oct 2025 11:06:48 +0200
Subject: [PATCH] add exceptions

---
 src/main/kotlin/com/infendro/migration/Migration.kt          | 5 +++++
 .../migration/exception/DuplicateMigrationException.kt       | 5 +++++
 2 files changed, 10 insertions(+)
 create mode 100644 src/main/kotlin/com/infendro/migration/exception/DuplicateMigrationException.kt

diff --git a/src/main/kotlin/com/infendro/migration/Migration.kt b/src/main/kotlin/com/infendro/migration/Migration.kt
index f965fa5..b89aca1 100644
--- a/src/main/kotlin/com/infendro/migration/Migration.kt
+++ b/src/main/kotlin/com/infendro/migration/Migration.kt
@@ -1,5 +1,6 @@
 package com.infendro.migration
 
+import com.infendro.migration.exception.DuplicateMigrationException
 import com.infendro.migration.model.MigrationRepository
 import com.infendro.migration.model.MigrationTable
 import org.jetbrains.exposed.sql.SchemaUtils
@@ -53,6 +54,10 @@ class Config {
         name: String,
         migrate: Transaction.() -> Unit,
     ) {
+        if (migrations.any { it.name == name }) {
+            throw DuplicateMigrationException(name)
+        }
+
         migrations += Migration(name, migrate)
     }
 
diff --git a/src/main/kotlin/com/infendro/migration/exception/DuplicateMigrationException.kt b/src/main/kotlin/com/infendro/migration/exception/DuplicateMigrationException.kt
new file mode 100644
index 0000000..b8ba5c4
--- /dev/null
+++ b/src/main/kotlin/com/infendro/migration/exception/DuplicateMigrationException.kt
@@ -0,0 +1,5 @@
+package com.infendro.migration.exception
+
+class DuplicateMigrationException(
+    val name: String,
+) : Exception()