ChatMessage.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
 *
 * 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://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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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 org.glassfish.javaee.javascript.backend.chat;

import java.io.StringReader;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.json.Json;
import javax.json.JsonObject;
import javax.json.JsonReader;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import javax.websocket.Decoder;
import javax.websocket.Encoder;
import javax.websocket.EndpointConfig;

public class ChatMessage
        implements Decoder.Text<ChatMessage>, Encoder.Text<ChatMessage> {

    @NotNull
    @Size(min = 4, max = 14,
            message = "User name must be between 4 and 14 characters.")
    private String user;
    @NotNull
    @Size(min = 2, max = 255,
            message = "Message must be between 2 and 255 characters.")
    private String message;

    @Override
    public void init(EndpointConfig config) {
        // Nothing to do.
    }

    @Override
    public ChatMessage decode(String value) {
        try (JsonReader jsonReader = Json.createReader(
                new StringReader(value))) {
            JsonObject jsonObject = jsonReader.readObject();
            user = jsonObject.getString("user");
            message = jsonObject.getString("message");
        }

        return this;
    }

    @Override
    public boolean willDecode(String string) {
        return true; // Detect if it's a valid format.
    }

    @Override
    public String encode(ChatMessage chatMessage) {
        JsonObject jsonObject = Json.createObjectBuilder()
                .add("user", chatMessage.user)
                .add("message", chatMessage.message)
                .add("timestamp",
                        new SimpleDateFormat("MM/dd/yyyy h:mm:ss a z")
                        .format(new Date()))
                .build();

        return jsonObject.toString();
    }

    @Override
    public void destroy() {
        // Nothing to do.
    }

    @Override
    public String toString() {
        return "ChatMessage{" + "user=" + user + ", message=" + message + '}';
    }
}