MessageReader.java

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/*
 * Copyright (c) 2011 Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
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 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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/*
 * This source code is provided to illustrate the usage of a given feature
 * or technique and has been deliberately simplified. Additional steps
 * required for a production-quality application, such as security checks,
 * input validation and proper error handling, might not be present in
 * this sample code.
 */
 
 
import java.nio.ByteBuffer;
 
class MessageReader implements DataReader {
    private final ChatServer chatServer;
 
    public MessageReader(ChatServer chatServer) {
        this.chatServer = chatServer;
    }
 
    public boolean acceptsMessages() {
        return true;
    }
 
    @Override
    public void beforeRead(Client client) {
        // Check if we have any messages buffered and send them
        String message = client.nextMessage();
        while (message != null) {
            chatServer.writeMessageToClients(client, message);
            message = client.nextMessage();
        }
    }
 
    @Override
    public void onData(Client client, ByteBuffer buffer, int bytes) {
        buffer.flip();
        // Just append the message on the buffer
        client.appendMessage(new String(buffer.array(), 0, bytes));
    }
}