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      1 /*
      2  * Copyright (C) 2007 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.bluetooth;
     18 
     19 /**
     20  * The result of execution of a single AT command.<p>
     21  *
     22  *
     23  * This class can represent the final response to an AT command line, and also
     24  * intermediate responses to a single command within a chained AT command
     25  * line.<p>
     26  *
     27  * The actual responses that are intended to be send in reply to the AT command
     28  * line are stored in a string array. The final response is stored as an
     29  * int enum, converted to a string when toString() is called. Only a single
     30  * final response is sent from multiple commands chained into a single command
     31  * line.<p>
     32  * @hide
     33  */
     34 public class AtCommandResult {
     35     // Result code enumerations
     36     public static final int OK = 0;
     37     public static final int ERROR = 1;
     38     public static final int UNSOLICITED = 2;
     39 
     40     private static final String OK_STRING = "OK";
     41     private static final String ERROR_STRING = "ERROR";
     42 
     43     private int mResultCode;  // Result code
     44     private StringBuilder mResponse; // Response with CRLF line breaks
     45 
     46     /**
     47      * Construct a new AtCommandResult with given result code, and an empty
     48      * response array.
     49      * @param resultCode One of OK, ERROR or UNSOLICITED.
     50      */
     51     public AtCommandResult(int resultCode) {
     52         mResultCode = resultCode;
     53         mResponse = new StringBuilder();
     54     }
     55 
     56     /**
     57      * Construct a new AtCommandResult with result code OK, and the specified
     58      * single line response.
     59      * @param response The single line response.
     60      */
     61     public AtCommandResult(String response) {
     62         this(OK);
     63         addResponse(response);
     64     }
     65 
     66     public int getResultCode() {
     67         return mResultCode;
     68     }
     69 
     70     /**
     71      * Add another line to the response.
     72      */
     73     public void addResponse(String response) {
     74         appendWithCrlf(mResponse, response);
     75     }
     76 
     77     /**
     78      * Add the given result into this AtCommandResult object.<p>
     79      * Used to combine results from multiple commands in a single command line
     80      * (command chaining).
     81      * @param result The AtCommandResult to add to this result.
     82      */
     83     public void addResult(AtCommandResult result) {
     84         if (result != null) {
     85             appendWithCrlf(mResponse, result.mResponse.toString());
     86             mResultCode = result.mResultCode;
     87         }
     88     }
     89 
     90     /**
     91      * Generate the string response ready to send
     92      */
     93     public String toString() {
     94         StringBuilder result = new StringBuilder(mResponse.toString());
     95         switch (mResultCode) {
     96         case OK:
     97             appendWithCrlf(result, OK_STRING);
     98             break;
     99         case ERROR:
    100             appendWithCrlf(result, ERROR_STRING);
    101             break;
    102         }
    103         return result.toString();
    104     }
    105 
    106     /** Append a string to a string builder, joining with a double
    107      * CRLF. Used to create multi-line AT command replies
    108      */
    109     public static void appendWithCrlf(StringBuilder str1, String str2) {
    110         if (str1.length() > 0 && str2.length() > 0) {
    111             str1.append("\r\n\r\n");
    112         }
    113         str1.append(str2);
    114     }
    115 };
    116