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* Copyright (C) 2008 JRuby project
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package org.jruby.ext.ffi;
import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyModule;
import org.jruby.RubyObject;
import org.jruby.anno.JRubyClass;
import org.jruby.runtime.Arity;
import org.jruby.runtime.ObjectAllocator;
/**
* Defines a C callback's parameters and return type.
*/
@JRubyClass(name = FFIProvider.MODULE_NAME + "::" + Callback.CLASS_NAME, parent = "Object")
public class Callback extends RubyObject implements NativeParam {
public static final String CLASS_NAME = "Callback";
/**
* The arity of this function.
*/
protected final Arity arity;
protected final NativeType[] parameterTypes;
protected final NativeType returnType;
public static RubyClass createCallbackClass(Ruby runtime) {
RubyModule module = FFIProvider.getModule(runtime);
RubyClass result = module.defineClassUnder(CLASS_NAME,
runtime.getObject(),
ObjectAllocator.NOT_ALLOCATABLE_ALLOCATOR);
result.defineAnnotatedMethods(Callback.class);
result.defineAnnotatedConstants(Callback.class);
return result;
}
/**
* Creates a new <tt>Invoker</tt> instance.
* @param arity
*/
public Callback(Ruby runtime, NativeType returnType, NativeType[] paramTypes) {
super(runtime, FFIProvider.getModule(runtime).fastGetClass(CLASS_NAME));
this.arity = Arity.fixed(paramTypes.length);
this.parameterTypes = paramTypes;
this.returnType = returnType;
}
/**
* Returns the {@link org.jruby.runtime.Arity} of this function.
*
* @return The <tt>Arity</tt> of the native function.
*/
public final Arity getArity() {
return arity;
}
public final NativeType getReturnType() {
return returnType;
}
public final NativeType[] getParameterTypes() {
return parameterTypes;
}
}