BEGIN LICENSE BLOCK *****
Version: EPL 2.0/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Eclipse Public
License Version 2.0 (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/epl-v20.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.
Copyright (C) 2007 Ola Bini 
Alternatively, the contents of this file may be used under the terms of
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"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the EPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the EPL, the GPL or the LGPL.
END LICENSE BLOCK /***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 2.0 (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/epl-v20.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.
 *
 * Copyright (C) 2007 Ola Bini <ola@ologix.com>
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * 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"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the EPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the EPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/

package org.jruby;

import org.jruby.anno.JRubyClass;
import org.jruby.exceptions.CatchThrow;
import org.jruby.runtime.Block;
import org.jruby.runtime.ClassIndex;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

Minimal RubyContinuation class to support third-party users.
/**
 * Minimal RubyContinuation class to support third-party users.
 */
@JRubyClass(name="Continuation")
@Deprecated
public class RubyContinuation extends RubyObject {
    @Deprecated
    public static class Continuation extends CatchThrow {
        public Continuation() {
            super();
        }

        public Continuation(IRubyObject tag) {
            super(tag);
        }
    }

    private final Continuation continuation;
    private boolean disabled;
    
    public static void createContinuation(Ruby runtime) {
        RubyClass cContinuation = runtime.defineClass("Continuation",runtime.getObject(),runtime.getObject().getAllocator());

        cContinuation.setClassIndex(ClassIndex.CONTINUATION);
        cContinuation.setReifiedClass(RubyContinuation.class);

        cContinuation.getSingletonClass().undefineMethod("new");
        
        runtime.setContinuation(cContinuation);
    }

    @Deprecated
    public RubyContinuation(Ruby runtime) {
        super(runtime, runtime.getContinuation());
        this.continuation = new Continuation();
    }

    
A RubyContinuation used for catch/throw, which have a tag associated
Params:
runtime – Current JRuby runtime
tag – The tag to use/**
     * A RubyContinuation used for catch/throw, which have a tag associated
     *
     * @param runtime Current JRuby runtime
     * @param tag The tag to use
     */
    @Deprecated
    public RubyContinuation(Ruby runtime, IRubyObject tag) {
        super(runtime, runtime.getContinuation());
        this.continuation = new Continuation(tag);
    }

    @Deprecated
    public Continuation getContinuation() {
        return continuation;
    }

    @Deprecated
    public IRubyObject call(ThreadContext context, IRubyObject[] args) {
        if (disabled) {
            RubyKernel.raise(context, context.runtime.getThreadError(),
                    new IRubyObject[]{context.runtime.newString("continuations can not be called from outside their scope")},
                    Block.NULL_BLOCK);
        }
        continuation.args = args;
        throw continuation;
    }

    @Deprecated
    public IRubyObject enter(ThreadContext context, IRubyObject yielded, Block block) {
        try {
            return block.yield(context, yielded);
        } catch (Continuation c) {
            if (c == continuation) {
                if (continuation.args.length == 0) {
                    return context.nil;
                } else if (continuation.args.length == 1) {
                    return continuation.args[0];
                } else {
                    return RubyArray.newArrayMayCopy(context.runtime, continuation.args);
                }
            } else {
                throw c;
            }
        } finally {
            disabled = true;
        }
    }
}// RubyContinuation