TextVersionCommand.java

/**
 *Copyright [2009-2010] [dennis zhuang(killme2008@gmail.com)]
 *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
 */
/**
 *Copyright [2009-2010] [dennis zhuang(killme2008@gmail.com)]
 *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 net.rubyeye.xmemcached.command.text;

import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.util.concurrent.CountDownLatch;

import net.rubyeye.xmemcached.command.Command;
import net.rubyeye.xmemcached.command.CommandType;
import net.rubyeye.xmemcached.command.ServerAddressAware;
import net.rubyeye.xmemcached.impl.MemcachedTCPSession;
import net.rubyeye.xmemcached.utils.ByteUtils;

import com.google.code.yanf4j.buffer.IoBuffer;

/**
 * Version command for text protocol
 * 
 * @author dennis
 * 
 */
public class TextVersionCommand extends Command implements ServerAddressAware {
	public InetSocketAddress server;

	public final InetSocketAddress getServer() {
		return this.server;
	}

	public final void setServer(InetSocketAddress server) {
		this.server = server;
	}

	public TextVersionCommand(final CountDownLatch latch,
			InetSocketAddress server) {
		super("[version]", (byte[]) null, latch);
		this.commandType = CommandType.VERSION;
		this.server = server;
	}

	@Override
	public final boolean decode(MemcachedTCPSession session, ByteBuffer buffer) {
		String line = ByteUtils.nextLine(buffer);
		if (line != null) {
			if (line.startsWith("VERSION")) {
				String[] items = line.split(" ");
				setResult(items.length > 1 ? items[1] : "unknown version");
				countDownLatch();
				return true;
			} else {
				return decodeError(line);
			}
		}
		return false;
	}

	@Override
	public final void encode() {
		this.ioBuffer = IoBuffer.wrap(VERSION.slice());
	}

}