/**
* Gets the method id matching the given arguments.
*
*/
jmethodID JConstructor::getMethodID( const JClass* jClass, const JArguments& arguments ) {
/* We cache the jmethodID locally, so if we've already found it,
* we don't need to go looking for it again.
*/
if ( mMethodID ) {
return mMethodID;
}
/* If we don't already have the jmethodID, we need to determine
* the signature of this method.
*/
/* We construct this signature with a void return type,
* because the return type for constructors is void.
*/
JSignature signature( *JVoid::staticGetJavaJniClass() );
typedef list<JValue*> ValueList;
ValueList args = arguments.asList();
ValueList::iterator i = args.begin();
ValueList::iterator end = args.end();
for ( ; i != end; ++i ) {
JValue* value = *i;
signature << *value->getJavaJniClass();
}
string methodSignature = signature.toString();
/* Now that we have the signature for the method, we could look
* in a global cache for the jmethodID corresponding to this method,
* but for now, we'll always find it.
*/
JNIEnv* env = helper::attach();
mMethodID = env->GetMethodID( jClass->getClass(), "<init>", methodSignature.c_str() );
if ( mMethodID == NULL ) {
string msg = string( "JConstructor::getMethodID\n" ) +
"Unable to find a constructor for " + jClass->getName() + "\n" +
"The signature is <" + methodSignature + ">";
try
{
helper::catchAndThrow();
}
catch (JNIException e)
{
msg.append("\ncaused by:\n");
msg.append(e.what());
}
throw JNIException( msg );
}
return mMethodID;
}
