/**

  * HTML via Java(tm) Language Bindings

  * Copyright (C) 2013 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, version 2 of the License.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details. apidesign.org

  * designates this particular file as subject to the

  * "Classpath" exception as provided by apidesign.org

  * in the License file that accompanied this code.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program. Look for COPYING file in the top folder.

  * If not, see http://wiki.apidesign.org/wiki/GPLwithClassPathException

  */

 package org.apidesign.html.json.impl;

 import net.java.html.BrwsrCtx;

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

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 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 int dataSize() {

             return -1;

         }

         public <Data> void dataRead(BrwsrCtx ctx, Class<? extends Data> type, Data[] fillTheArray) {

         }

         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() {

                 @Override

                 public int dataSize() {

                     if (value instanceof Object[]) {

                         return ((Object[])value).length;

                     } else {

                         return 1;

                     }

                 }

                 @Override

                 public <Data> void dataRead(BrwsrCtx context, Class<? extends Data> type, Data[] arr) {

                     if (value instanceof Object[]) {

                         Object[] data = ((Object[]) value);

                         for (int i = 0; i < data.length && i < arr.length; i++) {

                             arr[i] = org.apidesign.html.json.impl.JSON.read(context, type, data[i]);

                         }

                     } else {

                         if (arr.length > 0) {

                             arr[0] = org.apidesign.html.json.impl.JSON.read(context, type, value);

                         }

                     }

                 }

                 @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);

                 }

             };

         }

     } // end MsgEvnt

 }