Method cast

rust/src/api/mod.rs:1174–1203

Invokes the static method `method_name` of the class `class_name`, passing an array of `InvocationArg`s. It returns an `Instance` as the result of the invocation.

(&self, from_instance: &Instance, to_class: &str)

    /// Invokes the static method `method_name` of the class `class_name`, passing an array of `InvocationArg`s. It returns an `Instance` as the result of the invocation.
    pub fn cast(&self, from_instance: &Instance, to_class: &str) -> errors::Result<Instance> {
        debug(&format!("Casting to class {}", to_class));
        unsafe {
            // First argument is the jobject that is inside the from_instance
            // Second argument: create a jstring to pass as argument for the to_class
            let to_class_jstring: jstring =
                jni_utils::global_jobject_from_str(to_class, self.jni_env)?;

            // Call the cast method
            let java_instance = (opt_to_res(cache::get_jni_call_static_object_method())?)(
                self.jni_env,
                cache::get_class_to_invoke_clone_and_cast()?,
                cache::get_cast_static_method()?,
                from_instance.jinstance,
                to_class_jstring,
            );

            // Check for exceptions before creating the globalref
            Self::do_return(self.jni_env, ())?;

            // Prevent memory leaks from the created local references
            jni_utils::delete_java_ref(self.jni_env, to_class_jstring);

            // Create and return the Instance
            Self::do_return(
                self.jni_env,
                Instance::from_jobject_with_global_ref(java_instance)?,
            )
        }
    }

    /// Checks whether an Instance a is equal to some InvocationArg.
    ///