/* | |
* 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.command; | |
import java.util.ArrayList; | |
import java.util.List; | |
import com.alibaba.dubbo.common.extension.Activate; | |
import com.alibaba.dubbo.common.extension.ExtensionLoader; | |
import com.alibaba.dubbo.remoting.Channel; | |
import com.alibaba.dubbo.remoting.telnet.TelnetHandler; | |
import com.alibaba.dubbo.remoting.telnet.support.Help; | |
import com.alibaba.dubbo.remoting.telnet.support.TelnetUtils; | |
/** | |
* HelpTelnetHandler | |
* | |
* @author william.liangf | |
*/ | |
@Activate | |
@Help(parameter = "[command]", summary = "Show help.", detail = "Show help.") | |
public class HelpTelnetHandler implements TelnetHandler { | |
private final ExtensionLoader<TelnetHandler> extensionLoader = ExtensionLoader.getExtensionLoader(TelnetHandler.class); | |
public String telnet(Channel channel, String message) { | |
if (message.length() > 0) { | |
if (! extensionLoader.hasExtension(message)) { | |
return "No such command " + message; | |
} | |
TelnetHandler handler = extensionLoader.getExtension(message); | |
Help help = handler.getClass().getAnnotation(Help.class); | |
StringBuilder buf = new StringBuilder(); | |
buf.append("Command:\r\n "); | |
buf.append(message + " " + help.parameter().replace("\r\n", " ").replace("\n", " ")); | |
buf.append("\r\nSummary:\r\n "); | |
buf.append(help.summary().replace("\r\n", " ").replace("\n", " ")); | |
buf.append("\r\nDetail:\r\n "); | |
buf.append(help.detail().replace("\r\n", " \r\n").replace("\n", " \n")); | |
return buf.toString(); | |
} else { | |
List<List<String>> table = new ArrayList<List<String>>(); | |
List<TelnetHandler> handlers = extensionLoader.getActivateExtension(channel.getUrl(), "telnet"); | |
if (handlers != null && handlers.size() > 0) { | |
for (TelnetHandler handler : handlers) { | |
Help help = handler.getClass().getAnnotation(Help.class); | |
List<String> row = new ArrayList<String>(); | |
String parameter = " " + extensionLoader.getExtensionName(handler) + " " + (help != null ? help.parameter().replace("\r\n", " ").replace("\n", " ") : ""); | |
row.add(parameter.length() > 50 ? parameter.substring(0, 50) + "..." : parameter); | |
String summary = help != null ? help.summary().replace("\r\n", " ").replace("\n", " ") : ""; | |
row.add(summary.length() > 50 ? summary.substring(0, 50) + "..." : summary); | |
table.add(row); | |
} | |
} | |
return "Please input \"help [command]\" show detail.\r\n" + TelnetUtils.toList(table); | |
} | |
} | |
} |