Tidied method signature stuff

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@2984 72102866-910b-0410-8b05-ffd578937521

Source/NSDistantObject.m

@@ -24,6 +24,7 @@
 
 #include <config.h>
 #include <Foundation/DistributedObjects.h>
+#include <Foundation/NSMethodSignature.h>
 #include <Foundation/NSException.h>
 
 static int debug_proxy;
@@ -299,6 +300,30 @@ format: @"NSDistantObject objects only encode with PortEncoder class"];
     return self;
 }
 
+- (NSMethodSignature*) methodSignatureForSelector: (SEL)aSelector
+{
+    const char	*types = 0;
+
+    if (_protocol) {
+	struct objc_method_description* mth;
+
+	mth = [_protocol descriptionForInstanceMethod: aSelector];
+	if (mth == 0) {
+	    mth = [_protocol descriptionForClassMethod: aSelector];
+	}
+	if (mth != 0) {
+	    types = mth->types;
+	}
+    }
+    else {
+	types = [self selectorTypeForProxy: aSelector];
+    }
+    if (types == 0) {
+	return nil;
+    }
+    return [NSMethodSignature signatureWithObjCTypes: types];
+}
+
 - (void) setProtocolForProxy: (Protocol*)aProtocol
 {
     _protocol = aProtocol;

Source/NSProxy.m

@@ -120,7 +120,7 @@
 - (void) forwardInvocation: (NSInvocation*)anInvocation
 {
     [NSException raise: NSInvalidArgumentException
-		    format: @"NSProxy should does not implement '%s'",
+		format: @"NSProxy should not implement '%s'",
 				sel_get_name(_cmd)];
 }
 
@@ -171,7 +171,8 @@
 
 - (NSMethodSignature*) methodSignatureForSelector: (SEL)aSelector
 {
-    [self notImplemented: _cmd];
+    [NSException raise: NSInvalidArgumentException format:
+	@"NSProxy should not implement 'methodSignatureForSelector:'"];
     return nil;
 }