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) 2002 Anders Bengtsson 
Copyright (C) 2002 Jan Arne Petersen 
Copyright (C) 2005 Charles O Nutter 
Copyright (C) 2007 Thomas E Enebo 
Copyright (C) 2007 Miguel Covarrubias 
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) 2002 Anders Bengtsson <ndrsbngtssn@yahoo.se>
 * Copyright (C) 2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
 * Copyright (C) 2005 Charles O Nutter <headius@headius.com>
 * Copyright (C) 2007 Thomas E Enebo <enebo@acm.org>
 * Copyright (C) 2007 Miguel Covarrubias <mlcovarrubias@gmail.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.exceptions;

import org.jruby.Ruby;
import org.jruby.RubyInstanceConfig;
import org.jruby.RubyLocalJumpError.Reason;
import org.jruby.runtime.builtin.IRubyObject;

This class should be used for performance reasons if the
Exception don't need a stack trace.
Author:
jpetersen/**
 * This class should be used for performance reasons if the
 * Exception don't need a stack trace.
 *
 * @author jpetersen
 */
public class JumpException extends RuntimeException {
    private static final long serialVersionUID = -228162532535826617L;
    
    public static class FlowControlException extends JumpException implements Unrescuable {
        protected int target;
        protected Object value;
        protected final Reason reason;

        public FlowControlException(Reason reason) {
            this.reason = reason;
        }
        public FlowControlException(Reason reason, int target, Object value) {
            this.reason = reason;
            this.target = target;
            this.value = value;
        }
        public int getTarget() { return target; }
        public void setTarget(int target) { this.target = target; }
        public Object getValue() { return value; }
        public void setValue(Object value) { this.value = value; }

        public RaiseException buildException(Ruby runtime) {
            switch (reason) {
                case RETURN:
                case BREAK:
                case NEXT:
                    // takes an argument
                    return runtime.newLocalJumpError(reason, (IRubyObject)value, "unexpected " + reason);
                case REDO:
                case RETRY:
                    // no argument
                    return runtime.newLocalJumpError(reason, runtime.getNil(), "unexpected " + reason);
                case NOREASON:
                default:
                    // different message or no reason given
                    return runtime.newLocalJumpError(reason, runtime.getNil(), "no reason");
            }
        }
    }
    
    public static class SpecialJump extends FlowControlException {
        public SpecialJump() {
            super(Reason.NOREASON);
        }
        @Override
        public Throwable fillInStackTrace() {
            // never fill stack-trace, even if RubyInstanceConfig.JUMPS_HAVE_BACKTRACE
            return this;
        }
    }
    public static final SpecialJump SPECIAL_JUMP = new SpecialJump();

    
Constructor for flow-control-only JumpExceptions.
/**
     * Constructor for flow-control-only JumpExceptions.
     */
    public JumpException() {
    }
    
    
Constructor for JumpException.
Params:
msg – /**
     * Constructor for JumpException.
     * @param msg
     */
    public JumpException(String msg) {
        super(msg);
    }
    
    public JumpException(String msg, Throwable cause) {
        super(msg, cause);
    }
    
    
This method don't do anything for performance reasons.
See Also:
fillInStackTrace.fillInStackTrace()/** This method don't do anything for performance reasons.
     *
     * @see Throwable#fillInStackTrace()
     */
    @Override
    public Throwable fillInStackTrace() {
        if (RubyInstanceConfig.JUMPS_HAVE_BACKTRACE) {
            return originalFillInStackTrace();
        }
        
        return this;
    }
    
    protected final Throwable originalFillInStackTrace() {
        return super.fillInStackTrace();
    }
}