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package org.jruby.javasupport.ext;

import org.jruby.Ruby;
import org.jruby.RubyModule;
import org.jruby.internal.runtime.methods.JavaMethod;
import org.jruby.javasupport.Java;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

import static org.jruby.runtime.Visibility.PUBLIC;

/**
 * Kernel added Java short-cut methods.
 *
 * @author kares
 */
public final class Kernel {

    public static void define(final Ruby runtime) {
        runtime.getKernel().defineAnnotatedMethods(Kernel.class);
        final RubyModule Kernel = runtime.getKernel();
        Kernel.addMethodInternal("java", new JavaPackageMethod(Kernel, "java"));
        Kernel.addMethodInternal("javax", new JavaPackageMethod(Kernel, "javax"));
        Kernel.addMethodInternal("javafx", new JavaPackageMethod(Kernel, "javafx"));
        Kernel.addMethodInternal("com", new JavaPackageMethod(Kernel, "com"));
        Kernel.addMethodInternal("org", new JavaPackageMethod(Kernel, "org"));
    }

    private static final class JavaPackageMethod extends JavaMethod.JavaMethodZero {

        JavaPackageMethod(RubyModule implClass, String name) {
            super(implClass, PUBLIC, name);
        }

        @Override
        public IRubyObject call(ThreadContext context, IRubyObject self, RubyModule clazz, String name) {
            return get_pkg(context, name);
        }
    }

    private static IRubyObject get_pkg(final ThreadContext context, final String name) {
        RubyModule module = Java.getJavaPackageModule(context.runtime, name);
        return module == null ? context.nil : module;
    }

}