From 92adbc9515322c03ebc613da2f6046a6c0651c18 Mon Sep 17 00:00:00 2001
From: shahondin1624 <shahondin1624@gmail.com>
Date: Sat, 7 Feb 2026 08:58:33 +0100
Subject: [PATCH] Add result helper type

---
 src/main/java/mcp/util/Err.java    |  4 ++
 src/main/java/mcp/util/Ok.java     |  4 ++
 src/main/java/mcp/util/Result.java | 61 ++++++++++++++++++++++++++++++
 3 files changed, 69 insertions(+)
 create mode 100644 src/main/java/mcp/util/Err.java
 create mode 100644 src/main/java/mcp/util/Ok.java
 create mode 100644 src/main/java/mcp/util/Result.java

diff --git a/src/main/java/mcp/util/Err.java b/src/main/java/mcp/util/Err.java
new file mode 100644
index 0000000..5714eb3
--- /dev/null
+++ b/src/main/java/mcp/util/Err.java
@@ -0,0 +1,4 @@
+package mcp.util;
+
+public record Err<E, T extends Throwable>(T throwable) implements Result<E, T> {
+}
diff --git a/src/main/java/mcp/util/Ok.java b/src/main/java/mcp/util/Ok.java
new file mode 100644
index 0000000..90951e4
--- /dev/null
+++ b/src/main/java/mcp/util/Ok.java
@@ -0,0 +1,4 @@
+package mcp.util;
+
+public record Ok<E, T extends Throwable>(E value) implements Result<E, T> {
+}
diff --git a/src/main/java/mcp/util/Result.java b/src/main/java/mcp/util/Result.java
new file mode 100644
index 0000000..e2d4f2d
--- /dev/null
+++ b/src/main/java/mcp/util/Result.java
@@ -0,0 +1,61 @@
+package mcp.util;
+
+import java.util.Optional;
+
+public sealed interface Result<E, T extends Throwable> permits Err, Ok {
+   
+    default boolean isError() {
+        return this instanceof Err;
+    }
+    
+    default boolean isOk() {
+        return this instanceof Ok;
+    }
+    
+    default E unwrap() throws T {
+        return switch (this) {
+            case Err<E, T> err -> throw err.throwable();
+            case Ok<E, T> ok -> ok.value();
+        };
+    }
+    
+    default E unwrapOrElse(E defaultValue) {
+        try {
+            return isError() ? defaultValue : unwrap();
+        } catch (Throwable e) {
+            return defaultValue;
+        }
+    }
+    
+    default Optional<E> toOptional() {
+        try {
+            return isError() ? Optional.empty() : Optional.of(unwrap());
+        } catch (Throwable e) {
+            return Optional.empty();
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    default <R> Result<R, T> map(java.util.function.Function<? super E, ? extends R> mapper) {
+        return switch (this) {
+            case Ok<E, T> ok -> new Ok<>(mapper.apply(ok.value()));
+            case Err<E, T> err -> (Err<R, T>) err;
+        };
+    }
+
+    @SuppressWarnings("unchecked")
+    default <R> Result<R, T> flatMap(java.util.function.Function<? super E, ? extends Result<R, T>> mapper) {
+        return switch (this) {
+            case Ok<E, T> ok -> mapper.apply(ok.value());
+            case Err<E, T> err -> (Err<R, T>) err;
+        };
+    }
+
+    @SuppressWarnings("unchecked")
+    default <F extends Throwable> Result<E, F> mapError(java.util.function.Function<? super T, ? extends F> mapper) {
+        return switch (this) {
+            case Ok<E, T> ok -> (Ok<E, F>) ok;
+            case Err<E, T> err -> new Err<>(mapper.apply(err.throwable()));
+        };
+    }
+}