feat: add stdio protocol

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Signed-off-by: Jerome Louvel <374450+jlouvel@users.noreply.github.com>

Author: jlouvel

changes.md

@@ -74,6 +74,7 @@ Changes log
           communication-error response callback.
         - HTTP/2 and HTTP/3 requests advertise `te: trailers`; stream header names are normalized
           to lowercase at the HTTP boundary.
+        - Added the `Protocol.STDIO` pseudo-protocol constant for standard input/output connectors.
     - Bugs fixed
         - Slf4j bridge reports wrong line number and caller class in log4j. Issue #233.
         - When GET is an allowed method of a server resource, HEAD is now also listed (e.g. in the Allow header of a 405 response). Issue #266.

org.restlet/src/main/java/org/restlet/data/Protocol.java

@@ -91,6 +91,10 @@ public final class Protocol {
     public static final Protocol RIAP =
             new Protocol("riap", "RIAP", "Restlet Internal Access Protocol", UNKNOWN_PORT, true);
 
+    /** Standard Input/Output pseudo-protocol. */
+    public static final Protocol STDIO =
+            new Protocol("stdio", "STDIO", "Standard Input/Output Streams", UNKNOWN_PORT);
+
     /**
      * ZIP is a special scheme to access to representations inside Zip archive files. Example URI:
      * "zip:file:///tmp/test.zip!/test.txt".
@@ -127,6 +131,8 @@ public static Protocol valueOf(String name) {
                 result = JDBC;
             } else if (name.equalsIgnoreCase(RIAP.getSchemeName())) {
                 result = RIAP;
+            } else if (name.equalsIgnoreCase(STDIO.getSchemeName())) {
+                result = STDIO;
             } else if (name.equalsIgnoreCase(ZIP.getSchemeName())) {
                 result = ZIP;
             } else {

org.restlet/src/test/java/org/restlet/data/ProtocolTestCase.java

@@ -76,9 +76,18 @@ void valueOf_knownScheme_returnsSharedConstant() {
         assertSame(Protocol.JAR, Protocol.valueOf("jar"));
         assertSame(Protocol.JDBC, Protocol.valueOf("jdbc"));
         assertSame(Protocol.RIAP, Protocol.valueOf("riap"));
+        assertSame(Protocol.STDIO, Protocol.valueOf("stdio"));
         assertSame(Protocol.ZIP, Protocol.valueOf("zip"));
     }
 
+    @Test
+    void stdio_isAnUnknownPortPseudoProtocol() {
+        assertEquals("stdio", Protocol.STDIO.getSchemeName());
+        assertEquals("STDIO", Protocol.STDIO.getName());
+        assertEquals(Protocol.UNKNOWN_PORT, Protocol.STDIO.getDefaultPort());
+        assertFalse(Protocol.STDIO.isConfidential());
+    }
+
     @Test
     void valueOf_unknownScheme_createsNewProtocol() {
         Protocol protocol = Protocol.valueOf("custom");