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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
* are met:
*
* - 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
* notice, this list of conditions and the following disclaimer in the
* 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,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
import java.nio.ByteBuffer;
/**
* The first state a newly connected {@code Client} is in, this
* handles writing out the welcoming message and reads the response
* up to a newline. When a newline character have been received
* it changes the handler from NameReader to MessageReader on the
* client.
*/
class NameReader implements DataReader {
private final StringBuilder buffer = new StringBuilder();
private final ChatServer chatServer;
private boolean once = true;
private static final String NEWLINE = "\n";
public NameReader(ChatServer chatServer) {
this.chatServer = chatServer;
}
/**
* Writes the welcoming message to the client the first time this method
* is called.
*
* @param client the client to receive the message
*/
@Override
public void beforeRead(Client client) {
// if it is a long name that takes more than one read we only want to display Name: once.
if (once) {
client.writeStringMessage("Name: ");
once = false;
}
}
public boolean acceptsMessages() {
return false;
}
/**
* Receives incoming data from the socket, searches for a newline
* and tries to set the username if one is found
*/
@Override
public void onData(Client client, ByteBuffer buffer, int bytes) {
buffer.flip();
String name;
name = this.buffer.append(new String(buffer.array(), 0, bytes)).toString();
if (name.contains(NEWLINE)) {
onUserNameRead(client, name);
}
}
/**
* Splits the name on the newlines, takes the first as the username
* and appends everything else to the clients message buffer.
* Sets the clients handler to MessageReader.
*
* @param client the client to set the username for
* @param name the string containing the buffered input
*/
private void onUserNameRead(Client client, String name) {
String[] strings = name.split(NEWLINE, 2);
client.setUserName(strings[0].trim());
sendRemainingParts(client, strings);
client.setReader(new ClientReader(chatServer, new MessageReader(chatServer)));
client.writeStringMessage("Welcome " + client.getUserName() + "\n");
}
/**
* Appends the remaining parts to the clients message buffer
*
* @param client the client
* @param strings the messages to append to the buffer
*/
private void sendRemainingParts(Client client, String[] strings) {
for (int i = 1; i < strings.length; ++i) {
client.appendMessage(strings[i]);
}
}
}
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