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CommandChannel.java
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138 lines (109 loc) · 3.96 KB
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// This file is part of the "IBController".
// Copyright (C) 2004 Steven M. Kearns (skearns23@yahoo.com )
// Copyright (C) 2004 - 2011 Richard L King (rlking@aultan.com)
// For conditions of distribution and use, see copyright notice in COPYING.txt
// IBController is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// IBController is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with IBController. If not, see <http://www.gnu.org/licenses/>.
package ibcontroller;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.SocketException;
final class CommandChannel {
private static final String _Prompt = Settings.settings().getString("CommandPrompt", "");
private static final boolean _SuppressInfo = Settings.settings().getBoolean("SuppressInfoMessages", true);
private Socket mSocket;
private BufferedReader mInstream = null;
private BufferedWriter mOutstream = null;
CommandChannel(Socket socket) {
mSocket = socket;
if (! setupStreams()) return;
writeInfo("IBController Server");
writePrompt();
}
void close() {
try {
mSocket.shutdownInput();
mSocket.shutdownOutput();
mInstream.close();
mInstream = null;
mOutstream.close();
mOutstream = null;
mSocket.close();
mSocket = null;
} catch (SocketException e) {
// the socket was reset by the client - ignore
} catch (IOException e) {
// ignore
}
}
String getCommand() {
String cmd = null;
if (mInstream == null) return null;
try {
cmd = mInstream.readLine();
while (cmd != null && cmd.trim().isEmpty()) {
writePrompt();
cmd = mInstream.readLine();
}
if (cmd != null) Utils.logToConsole("IBControllerServer received command: " + cmd);
} catch (SocketException e) {
// the socket was reset by the client
close();
} catch (IOException e) {
close();
}
return cmd;
}
void writeAck(String info) {
replyLine("OK " + info);
}
final void writeInfo(String info) {
if (! _SuppressInfo) replyLine("INFO " + info);
}
void writeNack(String info) {
replyLine("ERROR " + info);
}
void writePrompt() {
if (! _Prompt.isEmpty()) reply(_Prompt);
}
private void reply(String message) {
reply(message, false);
}
private void reply(String message, boolean addNewline) {
if (mOutstream == null) return;
try {
mOutstream.write(message);
if (addNewline) mOutstream.newLine();
mOutstream.flush();
} catch (SocketException e) {
// the socket was reset by the client
} catch (Exception e) {
e.printStackTrace();
}
}
private void replyLine(String message) {
reply(message,true);
}
private boolean setupStreams() {
try {
mInstream = new BufferedReader(new InputStreamReader(mSocket.getInputStream()));
mOutstream = new BufferedWriter(new OutputStreamWriter(mSocket.getOutputStream()));
return true;
} catch (IOException e) {
// this is most likely a result of the user closing the command connection
return false;
}
}
}