/**

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

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  *

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  * 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

  * License.  When distributing the software, include this License Header

  * 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

  * your own identifying information:

  * "Portions Copyrighted [year] [name of copyright owner]"

  *

  * 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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  * to extend the choice of license to its licensees as provided above.

  * 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);

                 }

             };

         }

     } }