From ec9418c623ff9539654d4151bd30c668f3258c43 Mon Sep 17 00:00:00 2001
From: Laifsyn <99366187+Laifsyn@users.noreply.github.com>
Date: Wed, 10 Apr 2024 13:33:44 -0500
Subject: [PATCH] Basic Result<T,E> implementation

---
 src/main/java/com/utp/utils/Result.java | 52 +++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 src/main/java/com/utp/utils/Result.java

diff --git a/src/main/java/com/utp/utils/Result.java b/src/main/java/com/utp/utils/Result.java
new file mode 100644
index 0000000..ba6643f
--- /dev/null
+++ b/src/main/java/com/utp/utils/Result.java
@@ -0,0 +1,52 @@
+package com.utp.utils;
+
+import java.util.Optional;
+import java.util.function.Function;
+
+public class Result<T, E> {
+
+    private Optional<T> value;
+    private Optional<E> error;
+
+    private Result(T value, E error) {
+        this.value = Optional.ofNullable(value);
+        this.error = Optional.ofNullable(error);
+    }
+
+    public static <U, E> Result<U, E> ok(U value) {
+        return new Result<>(value, null);
+    }
+
+    public static <U, E> Result<U, E> error(E error) {
+        return new Result<>(null, error);
+    }
+
+    public boolean isError() {
+        return error.isPresent();
+    }
+
+    public boolean isOk() {
+        return value.isPresent();
+    }
+
+    public T unwrapOk() throws RuntimeException {
+        if (this.isError())
+            throw new RuntimeException("Called unwrapOk on an error Result");
+        return value.get();
+    }
+
+    public E unwrapError() throws RuntimeException {
+        if (this.isOk())
+            throw new RuntimeException("Called unwrapError on an ok Result");
+        return error.get();
+    }
+
+    public <U> Result<U, E> flatMap(Function<T, Result<U,E>> mapper) {
+
+        if (this.isError()) {
+            return Result.error(error.get());
+        }
+
+        return mapper.apply(value.get());
+    }
+}