From 2318caad7b8d86a4e092db4957614c44249dc2eb Mon Sep 17 00:00:00 2001
From: Bernd Busse <bernd@busse-net.de>
Date: Wed, 24 Jan 2024 18:44:59 +0100
Subject: [PATCH] classlib: add static nullOutputStream() to OutputStream
 (#878)

---
 .../teavm/classlib/java/io/TOutputStream.java | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/classlib/src/main/java/org/teavm/classlib/java/io/TOutputStream.java b/classlib/src/main/java/org/teavm/classlib/java/io/TOutputStream.java
index 57d1d4b88..f36d17e3a 100644
--- a/classlib/src/main/java/org/teavm/classlib/java/io/TOutputStream.java
+++ b/classlib/src/main/java/org/teavm/classlib/java/io/TOutputStream.java
@@ -19,6 +19,36 @@ import java.io.IOException;
 import org.teavm.classlib.java.lang.TObject;
 
 public abstract class TOutputStream extends TObject implements TCloseable, TFlushable {
+    public static TOutputStream nullOutputStream() {
+        return new TOutputStream() {
+            private boolean isClosed;
+
+            @Override
+            public void write(int b) throws IOException {
+                if (isClosed) {
+                    throw new IOException("Stream closed");
+                }
+            }
+
+            @Override
+            public void write(byte[] b) throws IOException {
+                write(b, 0, b.length);
+            }
+
+            @Override
+            public void write(byte[] b, int off, int len) throws IOException {
+                if (isClosed) {
+                    throw new IOException("Stream closed");
+                }
+            }
+
+            @Override
+            public void close() throws IOException {
+                isClosed = true;
+            }
+        };
+    }
+
     public abstract void write(int b) throws IOException;
 
     public void write(byte[] b) throws IOException {