/**

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.

 *

 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

 * Other names may be trademarks of their respective owners.

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 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

 * License. You can obtain a copy of the License at

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

 * specific language governing permissions and limitations under the

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 * Notice in each file and include the License file at

 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

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 * Contributor(s):

 *

 * The Original Software is NetBeans. The Initial Developer of the Original

 * Software is Oracle. Portions Copyright 2013-2014 Oracle. All Rights Reserved.

 *

 * If you wish your version of this file to be governed by only the CDDL

 * or only the GPL Version 2, indicate your decision by adding

 * "[Contributor] elects to include this software in this distribution

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 * However, if you add GPL Version 2 code and therefore, elected the GPL

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 */

package org.netbeans.html.json.impl;

import java.util.concurrent.Callable;

/** Super type for those who wish to receive JSON messages.

 *

 * @author Jaroslav Tulach

 */

public abstract class RcvrJSON {

    protected void onOpen(MsgEvnt msg) {}

    protected abstract void onMessage(MsgEvnt msg);

    protected void onClose(MsgEvnt msg) {}

    protected abstract void onError(MsgEvnt msg);

    public abstract static class MsgEvnt {

        MsgEvnt() {

        }

        public Throwable getError() {

            return null;

        }

        public final Exception getException() {

            Throwable t = getError();

            if (t instanceof Exception) {

                return (Exception)t;

            }

            if (t == null) {

                return null;

            }

            return new Exception(t);

        }

        public Object[] getValues() {

            return null;

        }

        public abstract void dispatch(RcvrJSON r);

        public static MsgEvnt createError(final Throwable t) {

            return new MsgEvnt() {

                @Override

                public Throwable getError() {

                    return t;

                }

                @Override

                public void dispatch(RcvrJSON r) {

                    r.onError(this);

                }

            };

        }

         public static MsgEvnt createMessage(final Object value) {

            return new MsgEvnt() {

                private Object val = value;

                @Override

                public Object[] getValues() {

                    if (val instanceof Callable) {

                        try {

                            val = ((Callable)val).call();

                        } catch (Exception ex) {

                            throw new IllegalStateException("Cannot compute " + val, ex);

                        }

                    }

                    return val instanceof Object[] ? (Object[])val : new Object[] { val };

                }

                @Override

                public void dispatch(RcvrJSON r) {

                    r.onMessage(this);

                }

            };

        }

        public static MsgEvnt createOpen() {

            return new MsgEvnt() {

                @Override

                public void dispatch(RcvrJSON r) {

                    r.onOpen(this);

                }

            };

        }

        public static MsgEvnt createClose() {

            return new MsgEvnt() {

                @Override

                public void dispatch(RcvrJSON r) {

                    r.onClose(this);

                }

            };

        }

    } }