JavaCallable.java :  » Scripting » jruby » org » jruby » javasupport » Java Open Source

/***** BEGIN LICENSE BLOCK *****
 * Version: CPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Common Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/cpl-v10.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
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 * Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
 * Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
 * Copyright (C) 2004 Jan Arne Petersen <jpetersen@uni-bonn.de>
 * Copyright (C) 2004 David Corbin <dcorbin@users.sourceforge.net>
 * 
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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package org.jruby.javasupport;

import java.lang.reflect.Modifier;

import org.jruby.Ruby;
import org.jruby.RubyArray;
import org.jruby.RubyBoolean;
import org.jruby.RubyClass;
import org.jruby.RubyFixnum;
import org.jruby.runtime.CallbackFactory;
import org.jruby.runtime.builtin.IRubyObject;

public abstract class JavaCallable extends JavaAccessibleObject {

    public JavaCallable(Ruby runtime, RubyClass rubyClass) {
        super(runtime, rubyClass);
    }

    public final RubyFixnum arity() {
        return getRuntime().newFixnum(getArity());
    }

    public final RubyArray argument_types() {
        Class[] parameterTypes = parameterTypes();
        RubyArray result = getRuntime().newArray(parameterTypes.length);
        for (int i = 0; i < parameterTypes.length; i++) {
            result.append(JavaClass.get(getRuntime(),  parameterTypes[i]));
        }
        return result;
    }

    public IRubyObject inspect() {
        StringBuffer result = new StringBuffer();
        result.append(nameOnInspection());
        Class[] parameterTypes = parameterTypes();
        for (int i = 0; i < parameterTypes.length; i++) {
            result.append(parameterTypes[i].getName());
            if (i < parameterTypes.length - 1) {
                result.append(',');
            }
        }
        result.append(")>");
        return getRuntime().newString(result.toString());
    }

    protected abstract int getArity();
    protected abstract Class[] parameterTypes();
    protected abstract int getModifiers();

    /**
     * @return the name used in the head of the string returned from inspect()
     */
    protected abstract String nameOnInspection();

    public RubyBoolean public_p() {
        return RubyBoolean.newBoolean(getRuntime(), Modifier.isPublic(getModifiers()));
    }


    public static void registerRubyMethods(Ruby runtime, RubyClass result, Class klass) {
        registerRubyMethods(runtime, result);
        
        CallbackFactory callbackFactory = runtime.callbackFactory(klass);

        result.defineFastMethod("public?",  callbackFactory.getFastMethod("public_p"));
    }
}