is_{read,writ}able: native only

Same rationale as is_exe native only

Author: scivision

+stdlib/+java/is_readable.m

@@ -4,20 +4,16 @@
 % file: single path string
 %% Outputs
 % ok: true if file is readable
-% b: backend used
 
-function [ok, b] = is_readable(file, backend)
+function ok = is_readable(file)
 arguments
   file string
-  backend (1,:) string = ["java", "native", "legacy"]
 end
 
-[fun, b] = hbackend(backend, "is_readable");
-
-if isscalar(file) || b == "native"
-  ok = fun(file);
+if isscalar(file)
+  ok = stdlib.legacy.is_readable(file);
 else
-  ok = arrayfun(fun, file);
+  ok = stdlib.native.is_readable(file);
 end
 
 end

+stdlib/+java/is_writable.m

@@ -2,23 +2,18 @@
 %
 %%% Inputs
 % * file: path to file or folder
-% * backend: backend to use
 %% Outputs
 % * ok: true if file is writable
-% * b: backend used
 
-function [ok, b] = is_writable(file, backend)
+function ok = is_writable(file)
 arguments
   file string
-  backend (1,:) string = ["java", "native", "legacy"]
 end
 
-[fun, b] = hbackend(backend, "is_writable");
-
-if isscalar(file) || b == "native"
-  ok = fun(file);
+if isscalar(file)
+  ok = stdlib.legacy.is_writable(file);
 else
-  ok = arrayfun(fun, file);
+  ok = stdlib.native.is_writable(file);
 end
 
 end

+stdlib/is_readable.m

@@ -69,7 +69,7 @@
           end
         case {'is_symlink', 'read_symlink'}
           if stdlib.matlabOlderThan('R2024b'), continue, end
-        case {'get_permissions', 'set_permissions', 'is_readable', 'is_writable'}
+        case {'get_permissions', 'set_permissions'}
           if stdlib.matlabOlderThan('R2025a'), continue, end
       end
 

+stdlib/is_writable.m

@@ -1,7 +1,5 @@
-  % https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/nio/file/Files.html#isReadable(java.nio.file.Path)
-  % java.nio.file.Files is about 10x slower than fileattrib
-  % file = stdlib.absolute(file, "", false);
-  % ok = java.nio.file.Files.isReadable(javaPathObject(file));
 function y = is_readable(p)
-y = javaFileObject(p).canRead();
+
+y = java.io.File(p).canRead();
+
 end

+stdlib/private/hbackend.m

@@ -1,10 +1,11 @@
+%% JAVA.IS_WRITABLE is a filepath writable
+
 function y = is_writable(p)
 
 % https://docs.oracle.com/en/java/javase/22/docs/api/java.base/java/nio/file/Files.html#isWritable(java.nio.file.Path)
-% java.nio.file.Files java is about 10x slower than fileattrib
-% needs absolute()
+% java.nio.file.Files java is about 10x slower than fileattrib and needs absolute()
 % file = stdlib.absolute(file, "", false);
 % ok = java.nio.file.Files.isWritable(javaPathObject(file));
 
-y = javaFileObject(p).canWrite();
+y = java.io.File(p).canWrite();
 end

example/+javafun/is_readable.m

@@ -11,9 +11,7 @@
 {"", false}
 }
 % on CI matlabroot can be writable!
-fname = {'is_readable', 'is_writable'}
-backend = init_backend({'java', 'native', 'legacy'}, 'native', ~isMATLABReleaseOlderThan('R2025a'))
-backend_ps = init_backend({'python', 'sys'})
+backend = init_backend({'python', 'sys'})
 end
 
 methods(TestClassSetup)
@@ -32,29 +30,42 @@ function test_exists(tc, Ps)
 end
 
 
-function test_is_rw(tc, Ps, backend, fname)
-h = str2func("stdlib." + fname);
+function test_is_readable(tc, Ps)
+r = stdlib.is_readable(Ps{1});
+tc.verifyEqual(r, Ps{2})
+end
 
-r = h(Ps{1}, backend);
+function test_is_writable(tc, Ps)
+r = stdlib.is_writable(Ps{1});
 tc.verifyEqual(r, Ps{2})
 end
 
 
-function test_is_rw_array(tc, backend, fname)
-h = str2func("stdlib." + fname);
+function test_is_readable_array(tc)
+tc.assumeFalse(stdlib.matlabOlderThan('R2025a'))
+in =  [".",  tempname(), mfilename('fullpath') + ".m"];
+out = [true, false,     true];
+
+r = stdlib.is_readable(in);
+tc.verifyEqual(r, out)
+end
+
+
+function test_is_writable_array(tc)
+tc.assumeFalse(stdlib.matlabOlderThan('R2025a'))
 in =  [".",  tempname(), mfilename('fullpath') + ".m"];
 out = [true, false,     true];
 
-r = h(in, backend);
+r = stdlib.is_writable(in);
 tc.verifyEqual(r, out)
 end
 
 
-function test_is_char_device(tc, backend_ps)
+function test_is_char_device(tc, backend)
 % /dev/stdin may not be available on CI systems
 n = stdlib.null_file();
 
-tc.verifyTrue(stdlib.is_char_device(n, backend_ps), n)
+tc.verifyTrue(stdlib.is_char_device(n, backend), n)
 end
 
 end