I am editing a Groovy (3.0.10) script and I am getting a syntactic error that I do not understand:
When I try this in GroovyConsole, it seems to work just fine.
Why is IntelliJ IDEA complaining? This is with IntelliJ IDEA 2022.1.1.
The snippet in text:
final java.nio.file.Path p;
p.traverse(type: FileType.FILES, nameFilter: ~/^\.deployment$/, maxDepth: 1) { final Path dotDeploymentPath ->
println dotDeploymentPath
}
UPDATE 1
I actually got the same error from Groovy when running the script in our product:
Script4.groovy: 59: [Static type checking] - Cannot call java.nio.file.Path#traverse(java.util.Map <java.lang.String, java.lang.Object>, groovy.lang.Closure) with arguments [java.util.LinkedHashMap <java.lang.String, java.io.Serializable>, groovy.lang.Closure]
# line 59, column 9.
extensionsPath.traverse(type: FileType.FILES, nameFilter: ~/^\.deployment$/, maxDepth: 1) { final Path dotDeploymentPath ->
^
UPDATE 2
I ended up with this which seems to work just fine. I still don't understand why Groovy does not like the options as arguments of the call.
def final traverseOptions = [type: FileType.FILES, nameFilter: ~/^\.deployment$/, maxDepth: 1] as Map<String, Object>;
extensionsPath.traverse(traverseOptions) { final Path dotDeploymentPath ->
So I figured this out. The issue was that I used #CompileStatic at the top of my class. I used #CompileStatic because I misunderstood what it does. I thought it were similar to saying static class in Java. But that is not what it does. What it does instead is this, from the docs: This will let the Groovy compiler use compile time checks in the style of Java then perform static compilation, thus bypassing the Groovy meta object protocol.
(This shows how important it is to provide self contained test case. I should have known better.)
I have groovy code as below:
def randomInt = RandomUtil.getRandomInt(1,200);
log.info randomInt
def chars = (("1".."9") + ("A".."Z") + ("a".."z")).join()
def randomString = RandomUtil.getRandomString(chars, randomInt) //works well with this code
log.info randomString
evaluate("log.info new Date()")
evaluate('RandomUtil.getRandomString(chars, randomInt)') //got error with this code
I want to evaluate a String which one like a {classname}.{methodname} in SoapUI with Groovy, just like above, but got error here, how to handle this and make it works well as I expect?
I have tried as blew:
evaluate('RandomUtil.getRandomString(chars, randomInt)') //got error with this code
Error As below:
Thu May 23 22:26:30 CST 2019:ERROR:An error occurred [No such property: getRandomString(chars, randomInt) for class: com.hypers.test.apitest.util.RandomUtil], see error log for details
The following code:
log = [info: { println(it) }]
class RandomUtil {
static def random = new Random()
static int getRandomInt(int from, int to) {
from + random.nextInt(to - from)
}
static String getRandomString(alphabet, len) {
def s = alphabet.size()
(1..len).collect { alphabet[random.nextInt(s)] }.join()
}
}
randomInt = RandomUtil.getRandomInt(1, 200)
log.info randomInt
chars = ('a'..'z') + ('A'..'Z') + ('0'..'9')
def randomString = RandomUtil.getRandomString(chars, 10) //works well with this code
log.info randomString
evaluate("log.info new Date()")
evaluate('RandomUtil.getRandomString(chars, randomInt)') //got error with this code
emulates your code, works, and produces the following output when run:
~> groovy solution.groovy
70
DDSQi27PYG
Thu May 23 20:51:58 CEST 2019
~>
I made up the RandomUtil class as you did not include the code for it.
I think the reason you are seeing the error you are seeing is that you define your variables char and randomInt using:
def chars = ...
and
def randomInt = ...
this puts the variables in local script scope. Please see this stackoverflow answer for an explanation with links to documentation of different ways of putting things in the script global scope and an explanation of how this works.
Essentially your groovy script code is implicitly an instance of the groovy Script class which in turn has an implicit Binding instance associated with it. When you write def x = ..., your variable is locally scoped, when you write x = ... or binding.x = ... the variable is defined in the script binding.
The evaluate method uses the same binding as the implicit script object. So the reason my example above works is that I omitted the def and just typed chars = and randomInt = which puts the variables in the script binding thus making them available for the code in the evaluate expression.
Though I have to say that even with all that, the phrasing No such property: getRandomString(chars, randomInt) seems really strange to me...I would have expected No such method or No such property: chars etc.
Sharing the code for for RandomUtil might help here.
Could some one help me how to mock this call?
Actual code
final ServicesLocal servicesBean = new WSDelegate().getServiceLocal();
here is my mock code
mockDelegate = mock(PortalDelegate.class);
PowerMockito.whenNew(PortalDelegate.class).withAnyArguments().thenReturn(mockPortalDelegate);
You have to add the when for the method invocation as well.
ServicesLocal mockServicesLocal = mock(ServicesLocal.class);
when(mockDelegate.getServiceLocal()).thenReturn(mockServicesLocal);
I am having some serious trouble getting a Python 2 based C++ engine to work in Python3. I know the whole IO stack has changed, but everything I seem to try just ends up in failure. Below is the pre-code (Python2) and post code (Python3). I am hoping someone can help me figure out what I'm doing wrong.I am also using boost::python to control the references.
The program is supposed to load a Python Object into memory via a map and then upon using the run function it then finds the file loaded in memory and runs it. I based my code off an example from the delta3d python manager, where they load in a file and run it immediately. I have not seen anything equivalent in Python3.
Python2 Code Begins here:
// what this does is first calls the Python C-API to load the file, then pass the returned
// PyObject* into handle, which takes reference and sets it as a boost::python::object.
// this takes care of all future referencing and dereferencing.
try{
bp::object file_object(bp::handle<>(PyFile_FromString(fullPath(filename), "r" )));
loaded_files_.insert(std::make_pair(std::string(fullPath(filename)), file_object));
}
catch(...)
{
getExceptionFromPy();
}
Next I load the file from the std::map and attempt to execute it:
bp::object loaded_file = getLoadedFile(filename);
try
{
PyRun_SimpleFile( PyFile_AsFile( loaded_file.ptr()), fullPath(filename) );
}
catch(...)
{
getExceptionFromPy();
}
Python3 Code Begins here: This is what I have so far based off some suggestions here... SO Question
Load:
PyObject *ioMod, *opened_file, *fd_obj;
ioMod = PyImport_ImportModule("io");
opened_file = PyObject_CallMethod(ioMod, "open", "ss", fullPath(filename), "r");
bp::handle<> h_open(opened_file);
bp::object file_obj(h_open);
loaded_files_.insert(std::make_pair(std::string(fullPath(filename)), file_obj));
Run:
bp::object loaded_file = getLoadedFile(filename);
int fd = PyObject_AsFileDescriptor(loaded_file.ptr());
PyObject* fileObj = PyFile_FromFd(fd,fullPath(filename),"r",-1,"", "\n","", 0);
FILE* f_open = _fdopen(fd,"r");
PyRun_SimpleFile( f_open, fullPath(filename) );
Lastly, the general state of the program at this point is the file gets loaded in as TextIOWrapper and in the Run: section the fd that is returned is always 3 and for some reason _fdopen can never open the FILE which means I can't do something like PyRun_SimpleFile. The error itself is a debug ASSERTION on _fdopen. Is there a better way to do all this I really appreciate any help.
If you want to see the full program of the Python2 version it's on Github
So this question was pretty hard to understand and I'm sorry, but I found out my old code wasn't quite working as I expected. Here's what I wanted the code to do. Load the python file into memory, store it into a map and then at a later date execute that code in memory. I accomplished this a bit differently than I expected, but it makes a lot of sense now.
Open the file using ifstream, see the code below
Convert the char into a boost::python::str
Execute the boost::python::str with boost::python::exec
Profit ???
Step 1)
vector<char> input;
ifstream file(fullPath(filename), ios::in);
if (!file.is_open())
{
// set our error message here
setCantFindFileError();
input.push_back('\0');
return input;
}
file >> std::noskipws;
copy(istream_iterator<char>(file), istream_iterator<char>(), back_inserter(input));
input.push_back('\n');
input.push_back('\0');
Step 2)
bp::str file_str(string(&input[0]));
loaded_files_.insert(std::make_pair(std::string(fullPath(filename)), file_str));
Step 3)
bp::str loaded_file = getLoadedFile(filename);
// Retrieve the main module
bp::object main = bp::import("__main__");
// Retrieve the main module's namespace
bp::object global(main.attr("__dict__"));
bp::exec(loaded_file, global, global);
Full Code is located on github:
In Ruby, objects have a handy method called method_missing which allows one to handle method calls for methods that have not even been (explicitly) defined:
Invoked by Ruby when obj is sent a message it cannot handle. symbol is the symbol for the method called, and args are any arguments that were passed to it. By default, the interpreter raises an error when this method is called. However, it is possible to override the method to provide more dynamic behavior. The example below creates a class Roman, which responds to methods with names consisting of roman numerals, returning the corresponding integer values.
class Roman
def romanToInt(str)
# ...
end
def method_missing(methId)
str = methId.id2name
romanToInt(str)
end
end
r = Roman.new
r.iv #=> 4
r.xxiii #=> 23
r.mm #=> 2000
For example, Ruby on Rails uses this to allow calls to methods such as find_by_my_column_name.
My question is, what other languages support an equivalent to method_missing, and how do you implement the equivalent in your code?
Smalltalk has the doesNotUnderstand message, which is probably the original implementation of this idea, given that Smalltalk is one of Ruby's parents. The default implementation displays an error window, but it can be overridden to do something more interesting.
PHP objects can be overloaded with the __call special method.
For example:
<?php
class MethodTest {
public function __call($name, $arguments) {
// Note: value of $name is case sensitive.
echo "Calling object method '$name' "
. implode(', ', $arguments). "\n";
}
}
$obj = new MethodTest;
$obj->runTest('in object context');
?>
Some use cases of method_missing can be implemented in Python using __getattr__ e.g.
class Roman(object):
def roman_to_int(self, roman):
# implementation here
def __getattr__(self, name):
return self.roman_to_int(name)
Then you can do:
>>> r = Roman()
>>> r.iv
4
I was looking for this before, and found a useful list (quickly being overtaken here) as part of the Merd project on SourceForge.
Construct Language
----------- ----------
AUTOLOAD Perl
AUTOSCALAR, AUTOMETH, AUTOLOAD... Perl6
__getattr__ Python
method_missing Ruby
doesNotUnderstand Smalltalk
__noSuchMethod__(17) CoffeeScript, JavaScript
unknown Tcl
no-applicable-method Common Lisp
doesNotRecognizeSelector Objective-C
TryInvokeMember(18) C#
match [name, args] { ... } E
the predicate fail Prolog
forward Io
With footnotes:
(17) firefox
(18) C# 4, only for "dynamic" objects
JavaScript has noSuchMethod, but unfortunately this is only supported by Firefox/Spidermonkey.
Here is an example:
wittyProjectName.__noSuchMethod__ = function __noSuchMethod__ (id, args) {
if (id == 'errorize') {
wittyProjectName.log("wittyProjectName.errorize has been deprecated.\n" +
"Use wittyProjectName.log(message, " +
"wittyProjectName.LOGTYPE_ERROR) instead.",
this.LOGTYPE_LOG);
// just act as a wrapper for the newer log method
args.push(this.LOGTYPE_ERROR);
this.log.apply(this, args);
}
}
Perl has AUTOLOAD which works on subroutines & class/object methods.
Subroutine example:
use 5.012;
use warnings;
sub AUTOLOAD {
my $sub_missing = our $AUTOLOAD;
$sub_missing =~ s/.*:://;
uc $sub_missing;
}
say foo(); # => FOO
Class/Object method call example:
use 5.012;
use warnings;
{
package Shout;
sub new { bless {}, shift }
sub AUTOLOAD {
my $method_missing = our $AUTOLOAD;
$method_missing =~ s/.*:://;
uc $method_missing;
}
}
say Shout->bar; # => BAR
my $shout = Shout->new;
say $shout->baz; # => BAZ
Objective-C supports the same thing and calls it forwarding.
This is accomplished in Lua by setting the __index key of a metatable.
t = {}
meta = {__index = function(_, idx) return function() print(idx) end end}
setmetatable(t, meta)
t.foo()
t.bar()
This code will output:
foo
bar
In Common Lisp, no-applicable-method may be used for this purpose, according to the Common Lisp Hyper Spec:
The generic function no-applicable-method is called when a generic function is invoked and no method on that generic function is applicable. The default method signals an error.
The generic function no-applicable-method is not intended to be called by programmers. Programmers may write methods for it.
So for example:
(defmethod no-applicable-method (gf &rest args)
;(error "No applicable method for args:~% ~s~% to ~s" args gf)
(%error (make-condition 'no-applicable-method :generic-function gf :arguments args) '()
;; Go past the anonymous frame to the frame for the caller of the generic function
(parent-frame (%get-frame-ptr))))
C# now has TryInvokeMember, for dynamic objects (inheriting from DynamicObject)
Actionscript 3.0 has a Proxy class that can be extended to provide this functionality.
dynamic class MyProxy extends Proxy {
flash_proxy override function callProperty(name:*, ...rest):* {
try {
// custom code here
}
catch (e:Error) {
// respond to error here
}
}
Tcl has something similar. Any time you call any command that can't be found, the procedure unknown will be called. While it's not something you normally use, it can be handy at times.
In CFML (ColdFusion, Railo, OpenBD), the onMissingMethod() event handler, defined within a component, will receive undefined method calls on that component. The arguments missingMethodName and missingMethodArguments are automatically passed in, allowing dynamic handling of the missing method call. This is the mechanism that facilitated the creation of implicit setter/getter schemes before they began to be built into the various CFML engines.
Its equivalent in Io is using the forward method.
From the docs:
If an object doesn't respond to a message, it will invoke its "forward" method if it has one....
Here is a simple example:
Shout := Object clone do (
forward := method (
method_missing := call message name
method_missing asUppercase
)
)
Shout baz println # => BAZ
/I3az/
Boo has IQuackFu - there is already an excellent summary on SO at how-can-i-intercept-a-method-call-in-boo
Here is an example:
class XmlObject(IQuackFu):
_element as XmlElement
def constructor(element as XmlElement):
_element = element
def QuackInvoke(name as string, args as (object)) as object:
pass # ignored
def QuackSet(name as string, parameters as (object), value) as object:
pass # ignored
def QuackGet(name as string, parameters as (object)) as object:
elements = _element.SelectNodes(name)
if elements is not null:
return XmlObject(elements[0]) if elements.Count == 1
return XmlObject(e) for e as XmlElement in elements
override def ToString():
return _element.InnerText