Merge pull request #98 from mprevel/hashcode

Add hashCode to TypeID
ant8e · Oct 18, 2024 · 070ad3c · 070ad3c
2 parents e244116 + de7dcc7
commit 070ad3c
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diff --git a/core/shared/src/main/scala/tech/ant8e/uuid4cats/TypeID.scala b/core/shared/src/main/scala/tech/ant8e/uuid4cats/TypeID.scala
@@ -202,6 +202,13 @@ object TypeID {
       case _             => false
     }
 
+    private lazy val hashCodeComputation: Int = {
+      val prime = 31
+      prime * (prime + prefix_.hashCode) + uuid_.hashCode
+    }
+
+    override def hashCode(): Int = hashCodeComputation
+
   }
 
   private[uuid4cats] def validatePrefix(

diff --git a/core/shared/src/test/scala/tech/ant8e/uuid4cats/TypeIDSuite.scala b/core/shared/src/test/scala/tech/ant8e/uuid4cats/TypeIDSuite.scala
@@ -259,6 +259,23 @@ class TypeIDSuite extends FunSuite {
     )
   }
 
+  test("TypeID should have a hashCode") {
+    val idString = "prefix_01h455vb4pex5vsknk084sn02q"
+    val id1_1 = TypeID.decode(idString).toOption.get
+    val id1_2 = TypeID.decode(idString).toOption.get
+    val id2 = TypeID.decode("prefix_01h455vb4pex5vsknk084sn02r").toOption.get
+    assertEquals(
+      id1_1.hashCode,
+      id1_2.hashCode,
+      "hashCode should be consistent for same data in different instances"
+    )
+    assertNotEquals(
+      id1_1.hashCode,
+      id2.hashCode,
+      "hashCode should be different for different data"
+    )
+  }
+
   private def assertValidEncoding(
       typeID: String,
       prefix: String,