at_cgatt.java

自己实现的基于串口通讯发送短消息的低层协议JAVA代码

package com.jzl.sirius.at.command;

import java.nio.CharBuffer;

import com.jzl.sirius.at.ATConstants;
import com.jzl.sirius.at.util.StringMatch;
import com.jzl.sirius.at.util.StringUtils;

/**
 * @author xujian
 * @version 2.0
 * @see com.jzl.sirius.at.ATCommand
 * @see com.jzl.sirius.at.command.ATCommandBase
 */
public class AT_CGATT extends ATCommandBase {

	private int commandType;

	private StringBuffer command = new StringBuffer();

	private int state = -1;
	private String supportedStates = "";

	/**
	 * 构造函数 提供"AT+CGATT?"的AT命令
	 */
	public AT_CGATT() {
		this(false);
	}

	/**
	 * 构造函数 提供"AT+CGATT=?"的AT命令或"AT+CGATT?"的AT命令
	 * 
	 * @param tested
	 *            当为true时提供"AT+CGATT=?"的AT命令，当为false时提供"AT+CGATT?"的AT命令。
	 */
	public AT_CGATT(boolean tested) {
        super(new StringMatch(ATConstants.CRLF + "+CGATT:"));
		commandType = tested ? COMMAND_TYPE_TEST : COMMAND_TYPE_READ;
		command.append(tested ? "AT+CGATT=?" : "AT+CGATT?");
		command.append(ATConstants.CR);
	}

	/**
	 * 构造函数 提供"AT+CGATT=int"的AT命令
	 * 
	 * @param state
	 *            state of GPRS attachment ,0 detached ,1 attached ,2 combined
	 *            detach (GPRS and GSM detach in the same network request)
	 */
	public AT_CGATT(int state) {
		commandType = COMMAND_TYPE_ACTION;
		command.append("AT+CGATT=");
		command.append(state);
		command.append(ATConstants.CR);
	}
    
    public String buildCommand() {
        return command.toString();
    }
    
    protected void decodeOkResponse(CharBuffer response) {
        String str = response.toString();
        try {
            if (commandType == COMMAND_TYPE_READ) {
                // format:<CR><LF>+CGATT: <state><CR><LF><CR><LF>OK<CR><LF>
                str = StringUtils.substring(str, "+CGATT:", ATConstants.CRLF).trim();
                
                state = Integer.parseInt(str);
                
            } else if (commandType == COMMAND_TYPE_TEST) {
                // format:<CR><LF>+CGATT: (list of supported <state>s)<CR><LF><CR><LF>OK<CR><LF>
                supportedStates = StringUtils.substring(str, "+CGATT:", ATConstants.CRLF).trim();
            }
        }
        catch(Exception ex) {
            
        }
    }

	/**
	 * 取得设备的state of GPRS attachment
	 * 
	 * @return 返回设备的state of GPRS attachment
	 */
	public int getState() {
		return state;
	}

	/**
	 * 取得设备支持的state of GPRS attachment
	 * 
	 * @return 返回设备支持的state of GPRS attachment
	 */
	public String getSupportedStates() {
		return supportedStates;
	}
    
}