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%module(directors="1") java_director_exception_feature
%include <std_except.i>
%warnfilter(SWIGWARN_TYPEMAP_DIRECTORTHROWS_UNDEF) MyNS::Foo::directorthrows_warning;
%include <std_string.i>
// DEFINE exceptions in header section using std::runtime_error
%{
#include <string>
#include <exception>
#include <iostream>
namespace MyNS {
struct Exception1 : public std::runtime_error {
Exception1(const std::string& what):runtime_error(what) {}
};
struct Exception2 : public std::runtime_error {
Exception2(const std::string& what):runtime_error(what) {}
};
struct Unexpected : public std::runtime_error {
Unexpected(const std::string& what):runtime_error(what) {}
};
}
%}
// Add an explicit handler for Foo::ping, mapping one java exception back to an 'int'
%feature("director:except") MyNS::Foo::ping {
jthrowable $error = jenv->ExceptionOccurred();
if ($error) {
if (Swig::ExceptionMatches(jenv,$error,"$packagepath/MyJavaException1")) {
throw 1;
} else if (Swig::ExceptionMatches(jenv,$error,"$packagepath/MyJavaException2")) {
std::string msg(Swig::JavaExceptionMessage(jenv,$error).message());
throw MyNS::Exception2(msg);
} else {
std::cerr << "Test failed, unexpected exception thrown: " <<
Swig::JavaExceptionMessage(jenv,$error).message() << std::endl;
throw std::runtime_error("unexpected exception in Foo::ping");
}
}
}
// Use default handler on Foo::pong, with directorthrows typemaps
// directorthrows typemaps for java->c++ conversions
%typemap(directorthrows) MyNS::Exception1,MyNS::Exception2,MyNS::Unexpected %{
if (Swig::ExceptionMatches(jenv, $error, "$packagepath/$javaclassname")) {
std::string msg(Swig::JavaExceptionMessage(jenv,$error).message());
throw $1_type(msg);
}
%}
// Override the director:except feature so exception specification is not violated
// (Cannot use built-in default of throw DirectorException)
%feature("director:except") MyNS::Foo::pong %{
jthrowable $error = jenv->ExceptionOccurred();
if ($error) {
$directorthrowshandlers
throw ::MyNS::Unexpected(Swig::JavaExceptionMessage(jenv,$error).message());
}
%}
// TODO 'throws' typemap emitted by emit_action (emit.cxx) has no way
// to get access to language specific special variables like
// $javaclassname or $packagepath ("java_director_exception_feature" here)
// throws typemaps for c++->java exception conversions
%typemap(throws,throws="MyJavaException1") MyNS::Exception1 %{
(void)$1;
jclass excpcls = jenv->FindClass("java_director_exception_feature/MyJavaException1");
if (excpcls) {
jenv->ThrowNew(excpcls, $1.what());
}
return $null;
%}
%typemap(throws,throws="MyJavaException1") int %{
(void)$1;
jclass excpcls = jenv->FindClass("java_director_exception_feature/MyJavaException1");
if (excpcls) {
jenv->ThrowNew(excpcls, "Threw some integer");
}
return $null;
%}
%typemap(throws,throws="MyJavaException2") MyNS::Exception2 %{
jclass excpcls = jenv->FindClass("java_director_exception_feature/MyJavaException2");
if (excpcls) {
jenv->ThrowNew(excpcls, $1.what());
}
return $null;
%}
%typemap(throws,throws="MyJavaUnexpected") MyNS::Unexpected %{
jclass excpcls = jenv->FindClass("java_director_exception_feature/MyJavaUnexpected");
if (excpcls) {
jenv->ThrowNew(excpcls, $1.what());
}
return $null;
%}
// Use generic exception translation approach like python, ruby
%feature("director:except") MyNS::Foo::genericpong {
jthrowable $error = jenv->ExceptionOccurred();
if ($error) {
if (Swig::ExceptionMatches(jenv,$error,"UnconstructableException")) {
// Purposefully test NULL
throw Swig::DirectorException(jenv, NULL);
}
throw Swig::DirectorException(jenv,$error);
}
}
// %exception with throws attribute. Need throws attribute for checked exceptions
%feature ("except",throws="Exception") MyNS::Foo::genericpong %{
%}
%feature ("except",throws="Exception") MyNS::Bar::genericpong %{
try {
$action
} catch (Swig::DirectorException & direxcp) {
direxcp.throwException(jenv); // jenv always available in JNI code
return $null;
}
%}
%feature("director") Foo;
// Rename exceptions on java side to make translation of exceptions more clear
%rename(MyJavaException1) MyNS::Exception1;
%rename(MyJavaException2) MyNS::Exception2;
%rename(MyJavaUnexpected) MyNS::Unexpected;
%typemap(javabase) ::MyNS::Exception1,::MyNS::Exception2,::MyNS::Unexpected "java.lang.Exception";
%rename(getMessage) what() const; // Rename all what() methods
namespace MyNS {
struct Exception1 {
Exception1(const std::string& what);
const char * what() const;
};
struct Exception2 {
Exception2(const std::string& what);
const char * what() const;
};
struct Unexpected {
Unexpected(const std::string& what);
const char * what() const;
};
}
// In general it is better to use %catches instead of an exception specification on the method
// since violating an exception specification calls terminate() preventing catch-all behavior
// like throwing std::runtime_error. But an exception specification must be used if the
// actual interface being wrapped does use them.
%catches(MyNS::Exception1,MyNS::Exception2,MyNS::Unexpected) MyNS::Foo::pong;
%catches(MyNS::Exception1,MyNS::Exception2,MyNS::Unexpected) MyNS::Bar::pong;
%{
// throw is deprecated in C++11 and invalid in C++17 and later
#if defined(__cplusplus) && __cplusplus >= 201103L
#define throw(TYPE1, TYPE2)
#else
#define throw(TYPE1, TYPE2) throw(TYPE1, TYPE2)
#if defined(_MSC_VER)
#pragma warning(disable: 4290) // C++ exception specification ignored except to indicate a function is not __declspec(nothrow)
#endif
#endif
%}
%inline %{
namespace MyNS {
class Foo {
public:
virtual ~Foo() {}
// ping java implementation throws a java Exception1 or an Exception2 if excp is 1 or 2.
// pong java implementation throws Exception1,Exception2,Unexpected,NullPointerException for 1,2,3,4
virtual std::string ping(int excp) throw(int,MyNS::Exception2) = 0;
virtual std::string pong(int excp) /* throws MyNS::Exception1 MyNS::Exception2 MyNS::Unexpected) */ = 0;
virtual std::string genericpong(int excp) /* unspecified throws - exception is always DirectorException in C++, translated back to whatever thrown in java */ = 0;
virtual std::string directorthrows_warning(int excp) throw(int,double) { return std::string(); }
};
// Make a bar from a foo, so a call to Java Bar
// goes Java Bar -> C++ Bar -> C++ Foo -> Java Foo Director
class Bar {
public:
Bar(Foo* d) { delegate=d; }
virtual std::string ping(int excp) throw(int,MyNS::Exception2)
{
return delegate->ping(excp);
}
virtual std::string pong(int excp) /* throws MyNS::Exception1,MyNS::Exception2,MyNS::Unexpected */
{
return delegate->pong(excp);
}
virtual std::string genericpong(int excp)
{
return delegate->genericpong(excp);
}
private:
Foo * delegate;
};
}
%}
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