ChatWebSocket.java

/*
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 *
 * Copyright (c) 2010-2011 Oracle and/or its affiliates. All rights reserved.
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 * The contents of this file are subject to the terms of either the GNU
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 * 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
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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package com.sun.grizzly.samples.websockets;

import org.glassfish.grizzly.websockets.BaseWebSocket;
import org.glassfish.grizzly.websockets.NetworkHandler;
import org.glassfish.grizzly.websockets.WebSocketListener;
import org.glassfish.grizzly.websockets.WebSocketException;

import java.util.logging.Level;
import java.io.IOException;

public class ChatWebSocket extends BaseWebSocket {
    private volatile String user;

    public ChatWebSocket(WebSocketListener... listeners) {
        super(listeners);
    }

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    /**
     * Send the message in JSON encoding acceptable by browser's javascript.
     *
     * @param user the user name
     * @param text the text message
     */
    public void sendJson(String user, String text) {
        try {
            final String msg = toJsonp(user, text);
            send(msg);
        } catch (WebSocketException e) {
            WebSocketsServlet.logger.log(Level.SEVERE, "Removing chat client: " + e.getMessage(), e);
            close(PROTOCOL_ERROR, e.getMessage());
        }
    }

    private String toJsonp(String name, String message) {
        return "window.parent.app.update({ name: \"" + escape(name) +
                "\", message: \"" + escape(message) + "\" });\n";
    }

    private String escape(String orig) {
        StringBuilder buffer = new StringBuilder(orig.length());

        for (int i = 0; i < orig.length(); i++) {
            char c = orig.charAt(i);
            switch (c) {
                case '\b':
                    buffer.append("\\b");
                    break;
                case '\f':
                    buffer.append("\\f");
                    break;
                case '\n':
                    buffer.append("<br />");
                    break;
                case '\r':
                    // ignore
                    break;
                case '\t':
                    buffer.append("\\t");
                    break;
                case '\'':
                    buffer.append("\\'");
                    break;
                case '\"':
                    buffer.append("\\\"");
                    break;
                case '\\':
                    buffer.append("\\\\");
                    break;
                case '<':
                    buffer.append("<");
                    break;
                case '>':
                    buffer.append(">");
                    break;
                case '&':
                    buffer.append("&");
                    break;
                default:
                    buffer.append(c);
            }
        }

        return buffer.toString();
    }
}