/*
* Copyright 1999-2011 Alibaba Group.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.alibaba.dubbo.remoting.telnet.support;
import java.util.List;
import com.alibaba.dubbo.common.Constants;
import com.alibaba.dubbo.common.ExtensionLoader;
import com.alibaba.dubbo.common.utils.ConfigUtils;
import com.alibaba.dubbo.remoting.Channel;
import com.alibaba.dubbo.remoting.RemotingException;
import com.alibaba.dubbo.remoting.telnet.TelnetHandler;
import com.alibaba.dubbo.remoting.transport.ChannelHandlerAdapter;
/**
* TelnetHandlerDispather
*
* @author william.liangf
*/
public class TelnetHandlerAdapter extends ChannelHandlerAdapter implements TelnetHandler {
public String telnet(Channel channel, String message) throws RemotingException {
String telnet = channel.getUrl().getParameter("telnet");
String prompt = channel.getUrl().getParameter("prompt");
boolean noprompt = message.contains("--no-prompt");
message = message.replace("--no-prompt", "");
List<String> commands = ConfigUtils.mergeValues(TelnetHandler.class, telnet, Constants.DEFAULT_TELNET_COMMANDS);
StringBuilder buf = new StringBuilder();
if (commands != null && commands.size() > 0) {
message = message.trim();
String command;
if (message.length() > 0) {
int i = message.indexOf(' ');
if (i > 0) {
command = message.substring(0, i).trim();
message = message.substring(i + 1).trim();
} else {
command = message;
message = "";
}
} else {
command = "";
}
if (commands.contains(command)) {
TelnetHandler handler = ExtensionLoader.getExtensionLoader(TelnetHandler.class).getExtension(command);
try {
String result = handler.telnet(channel, message);
if (result != null) {
buf.append(result);
}
} catch (Throwable t) {
buf.append(t.getMessage());
}
} else if (command.length() > 0) {
buf.append("Unsupported command: ");
buf.append(command);
}
if (buf.length() > 0) {
buf.append("\r\n");
}
}
if (prompt != null && prompt.length() > 0 && ! noprompt) {
buf.append(prompt);
buf.append(">");
}
return buf.toString();
}
}