at_chld.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.StringUtils;

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

	private StringBuffer command = new StringBuffer();

	private int commandType;

	private String supportedNs = "";
	

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

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

	/**
	 * 构造函数 提供"AT+CHLD=int"的AT命令
	 * 
	 * @param n
	 *            call related services<br>
	 *            0 release all held calls or set User Determined User Busy
	 *            (UDUB) for a waiting call.<br>
	 *            1 release all active calls (if any exist) and accepts the
	 *            other (held or waiting) call.<br>
	 *            1X release a specific call X (active, held or waiting).<br>
	 *            2 place all active calls (if any exist) on hold and accepts
	 *            the other (held or waiting) call.<br>
	 *            2X place all active calls on hold except call X with which
	 *            communication is supported.<br>
	 *            3 add a held call to the conversation.<br>
	 *            4 connect the two calls and disconnect the subscriber from
	 *            both calls (Explicit Call Transfer).
	 */
	public AT_CHLD(int n) {
		command.append("AT+CHLD=");
        command.append(n);
		command.append(ATConstants.CR);
	}
    
    public String buildCommand() {
        return command.toString();
    }
    
    protected void decodeOkResponse(CharBuffer response) {
        String str = response.toString();
        try {
            if (commandType == COMMAND_TYPE_TEST) {
                // format:<CR><LF>+CHLD: (list of supported　<n>s)<CR><LF><CR><LF>OK<CR><LF>
                supportedNs = StringUtils.substring(str, "+CHLD:", ATConstants.CRLF).trim();
            }
        }
        catch(Exception ex) {
            
        }
    }
	
    /**
     * 取得设备支持的call related services值
     * @return　返回设备支持的call related services值
     */
    public String getSupportedNs() {
        return supportedNs;
    }

}