Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/solution_2src_2_active_bubble_sorter_8cpp_source.html
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<h1>examples/ForumNokia/Symbian_OS_Basics_Lab_Exercises_v3_1/Lab_04309.cb2/solution/src/ActiveBubbleSorter.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 2006 Nokia Corporation.</span>
<a name="l00002"></a>00002
<a name="l00003"></a>00003 <span class="preprocessor">#include "ActiveBubbleSorter.h"</span>
<a name="l00004"></a>00004 <span class="preprocessor">#include "BubbleSortNotify.h"</span>
<a name="l00005"></a>00005 <span class="preprocessor">#include <e32math.h></span>
<a name="l00006"></a>00006
<a name="l00007"></a>00007 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSortDataInputFileName, <span class="stringliteral">"C:\\private\\0515DFCE\\sortdata_in.dat"</span>);
<a name="l00008"></a>00008 <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KSortDataOutputFileName, <span class="stringliteral">"C:\\private\\0515DFCE\\sortdata_out.dat"</span>);
<a name="l00009"></a>00009 _LIT8(KNumberOutputFormat, <span class="stringliteral">"%d\r\n"</span>);
<a name="l00010"></a>00010
<a name="l00011"></a>00011
<a name="l00012"></a>00012 <span class="comment">// Constructs a CActiveBubbleSorter object</span>
<a name="l00013"></a>00013 <a class="code" href="class_c_active_bubble_sorter.html">CActiveBubbleSorter</a>* CActiveBubbleSorter::NewL(<a class="code" href="class_m_bubble_sort_notify.html">MBubbleSortNotify</a>& aNotifier)
<a name="l00014"></a>00014 {
<a name="l00015"></a>00015 <a class="code" href="class_c_active_bubble_sorter.html">CActiveBubbleSorter</a>* <span class="keyword">self</span> = <span class="keyword">new</span> (ELeave) <a class="code" href="class_c_active_bubble_sorter.html">CActiveBubbleSorter</a>(aNotifier);
<a name="l00016"></a>00016 CleanupStack::PushL(<span class="keyword">self</span>);
<a name="l00017"></a>00017 <span class="keyword">self</span>->ConstructL();
<a name="l00018"></a>00018 CleanupStack::Pop(<span class="keyword">self</span>);
<a name="l00019"></a>00019 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00020"></a>00020 }
<a name="l00021"></a>00021
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="comment">// C++ Constructor</span>
<a name="l00024"></a>00024 CActiveBubbleSorter::CActiveBubbleSorter(<a class="code" href="class_m_bubble_sort_notify.html">MBubbleSortNotify</a>& aNotifier)
<a name="l00025"></a>00025 : CActive(CActive::EPriorityIdle),
<a name="l00026"></a>00026 iNotifier(aNotifier)
<a name="l00027"></a>00027 {
<a name="l00028"></a>00028 CActiveScheduler::Add(<span class="keyword">this</span>);
<a name="l00029"></a>00029 }
<a name="l00030"></a>00030
<a name="l00031"></a>00031
<a name="l00032"></a>00032 <span class="comment">// C++ Destructor</span>
<a name="l00033"></a>00033 CActiveBubbleSorter::~CActiveBubbleSorter()
<a name="l00034"></a>00034 {
<a name="l00035"></a>00035 Cancel();
<a name="l00036"></a>00036 iNumbersArray.Close();
<a name="l00037"></a>00037 }
<a name="l00038"></a>00038
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <span class="comment">// Symbian 2nd phase construction</span>
<a name="l00041"></a>00041 <span class="keywordtype">void</span> CActiveBubbleSorter::ConstructL()
<a name="l00042"></a>00042 {
<a name="l00043"></a>00043 <span class="comment">// Do nothing</span>
<a name="l00044"></a>00044 }
<a name="l00045"></a>00045
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="comment">// Handles the cleanup necessary if sorting is cancelled</span>
<a name="l00048"></a>00048 <span class="keywordtype">void</span> CActiveBubbleSorter::DoCancel()
<a name="l00049"></a>00049 {
<a name="l00050"></a>00050 iNumbersArray.Reset();
<a name="l00051"></a>00051 iNotifier.<a class="code" href="class_m_bubble_sort_notify.html#a4efe680a413c28e6b6a7a92df6f0928c">SortComplete</a>(KErrCancel);
<a name="l00052"></a>00052 }
<a name="l00053"></a>00053
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="comment">// Handles each step of the sorting procedure</span>
<a name="l00056"></a>00056 <span class="keywordtype">void</span> CActiveBubbleSorter::RunL()
<a name="l00057"></a>00057 {
<a name="l00058"></a>00058 <span class="keywordflow">if</span> (iNumbersArray[iY] > iNumbersArray[iY+1])
<a name="l00059"></a>00059 {
<a name="l00060"></a>00060 TInt temp = iNumbersArray[iY+1];
<a name="l00061"></a>00061 iNumbersArray[iY+1] = iNumbersArray[iY];
<a name="l00062"></a>00062 iNumbersArray[iY] = temp;
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064
<a name="l00065"></a>00065 iY++;
<a name="l00066"></a>00066 TInt count = iNumbersArray.Count();
<a name="l00067"></a>00067
<a name="l00068"></a>00068 <span class="keywordflow">if</span> (iY >= count-1)
<a name="l00069"></a>00069 {
<a name="l00070"></a>00070 iY = 0;
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="keywordflow">if</span> (iX < count)
<a name="l00073"></a>00073 {
<a name="l00074"></a>00074 iX++;
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076 <span class="keywordflow">else</span>
<a name="l00077"></a>00077 {
<a name="l00078"></a>00078 <span class="comment">// Finished sorting</span>
<a name="l00079"></a>00079 WriteNumbersToFileL();
<a name="l00080"></a>00080 iNumbersArray.Reset();
<a name="l00081"></a>00081 iNotifier.<a class="code" href="class_m_bubble_sort_notify.html#a4efe680a413c28e6b6a7a92df6f0928c">SortComplete</a>(iStatus.Int());
<a name="l00082"></a>00082 <span class="keywordflow">return</span>;
<a name="l00083"></a>00083 }
<a name="l00084"></a>00084 }
<a name="l00085"></a>00085
<a name="l00086"></a>00086 TRequestStatus* status = &iStatus;
<a name="l00087"></a>00087 User::RequestComplete(status, KErrNone);
<a name="l00088"></a>00088 SetActive();
<a name="l00089"></a>00089 }
<a name="l00090"></a>00090
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="comment">// Called to begin sorting</span>
<a name="l00093"></a>00093 <span class="keywordtype">void</span> CActiveBubbleSorter::StartL()
<a name="l00094"></a>00094 {
<a name="l00095"></a>00095 <span class="keywordflow">if</span> (IsActive())
<a name="l00096"></a>00096 {
<a name="l00097"></a>00097 User::Leave(KErrInUse);
<a name="l00098"></a>00098 }
<a name="l00099"></a>00099
<a name="l00100"></a>00100 iNumbersArray.Reset();
<a name="l00101"></a>00101 ReadNumbersFromFileL();
<a name="l00102"></a>00102
<a name="l00103"></a>00103 iX = 0;
<a name="l00104"></a>00104 iY = 0;
<a name="l00105"></a>00105
<a name="l00106"></a>00106 TRequestStatus* status = &iStatus;
<a name="l00107"></a>00107 User::RequestComplete(status, KErrNone);
<a name="l00108"></a>00108 SetActive();
<a name="l00109"></a>00109 }
<a name="l00110"></a>00110
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="comment">// Reads numbers from an input file into an RArray</span>
<a name="l00113"></a>00113 <span class="keywordtype">void</span> CActiveBubbleSorter::ReadNumbersFromFileL()
<a name="l00114"></a>00114 {
<a name="l00115"></a>00115 <span class="comment">// Read contents of the input file into a descriptor</span>
<a name="l00116"></a>00116 RFs fs;
<a name="l00117"></a>00117 User::LeaveIfError(fs.Connect());
<a name="l00118"></a>00118 CleanupClosePushL(fs);
<a name="l00119"></a>00119
<a name="l00120"></a>00120 RFile file;
<a name="l00121"></a>00121 User::LeaveIfError(file.Open(fs, KSortDataInputFileName, EFileStreamText | EFileRead));
<a name="l00122"></a>00122 CleanupClosePushL(fs);
<a name="l00123"></a>00123
<a name="l00124"></a>00124 TInt sz = 0;
<a name="l00125"></a>00125 User::LeaveIfError(file.Size(sz));
<a name="l00126"></a>00126
<a name="l00127"></a>00127 HBufC8* buf = HBufC8::NewLC(sz);
<a name="l00128"></a>00128 TPtr8 ptr = buf->Des();
<a name="l00129"></a>00129 User::LeaveIfError(file.Read(ptr));
<a name="l00130"></a>00130
<a name="l00131"></a>00131 <span class="comment">// Extract numbers from the descriptor containing the contents of the input file</span>
<a name="l00132"></a>00132 TLex8 lx(ptr);
<a name="l00133"></a>00133 TBool finshed = EFalse;
<a name="l00134"></a>00134 <span class="keywordflow">while</span> (!finshed)
<a name="l00135"></a>00135 {
<a name="l00136"></a>00136 <span class="keywordflow">if</span> (lx.Eos())
<a name="l00137"></a>00137 {
<a name="l00138"></a>00138 finshed = ETrue;
<a name="l00139"></a>00139 }
<a name="l00140"></a>00140 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((lx.Peek()).IsDigit())
<a name="l00141"></a>00141 {
<a name="l00142"></a>00142 TInt num;
<a name="l00143"></a>00143 TInt err = lx.Val(num);
<a name="l00144"></a>00144 iNumbersArray.Append(num);
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146 <span class="keywordflow">else</span>
<a name="l00147"></a>00147 {
<a name="l00148"></a>00148 lx.Inc();
<a name="l00149"></a>00149 }
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151
<a name="l00152"></a>00152 CleanupStack::PopAndDestroy(3); <span class="comment">// automatically closes fs and file</span>
<a name="l00153"></a>00153 }
<a name="l00154"></a>00154
<a name="l00155"></a>00155
<a name="l00156"></a>00156 <span class="comment">// Writes the numbers in the RArray to an output file</span>
<a name="l00157"></a>00157 <span class="keywordtype">void</span> CActiveBubbleSorter::WriteNumbersToFileL()
<a name="l00158"></a>00158 {
<a name="l00159"></a>00159 RFs fs;
<a name="l00160"></a>00160 User::LeaveIfError(fs.Connect());
<a name="l00161"></a>00161 CleanupClosePushL(fs);
<a name="l00162"></a>00162
<a name="l00163"></a>00163 TInt ret = fs.Delete(KSortDataOutputFileName);
<a name="l00164"></a>00164 <span class="keywordflow">if</span> (!(ret == KErrNone || ret == KErrNotFound))
<a name="l00165"></a>00165 {
<a name="l00166"></a>00166 User::Leave(ret);
<a name="l00167"></a>00167 }
<a name="l00168"></a>00168
<a name="l00169"></a>00169 RFile file;
<a name="l00170"></a>00170 User::LeaveIfError(file.Create(fs, KSortDataOutputFileName, EFileStreamText | EFileWrite));
<a name="l00171"></a>00171 CleanupClosePushL(fs);
<a name="l00172"></a>00172
<a name="l00173"></a>00173 TBuf8<10> buf;
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <span class="keywordflow">for</span> (TInt i = 0; i < iNumbersArray.Count(); i++)
<a name="l00176"></a>00176 {
<a name="l00177"></a>00177 buf.Format(KNumberOutputFormat, iNumbersArray[i]);
<a name="l00178"></a>00178 file.Write(buf);
<a name="l00179"></a>00179 }
<a name="l00180"></a>00180
<a name="l00181"></a>00181 CleanupStack::PopAndDestroy(2); <span class="comment">// automatically closes fs and file</span>
<a name="l00182"></a>00182 }
<a name="l00183"></a>00183
<a name="l00184"></a>00184
<a name="l00185"></a>00185 <span class="comment">// Called in the event the RunL function leaves</span>
<a name="l00186"></a>00186 TInt CActiveBubbleSorter::RunError(TInt aError)
<a name="l00187"></a>00187 {
<a name="l00188"></a>00188 iNumbersArray.Reset();
<a name="l00189"></a>00189 iNotifier.<a class="code" href="class_m_bubble_sort_notify.html#a4efe680a413c28e6b6a7a92df6f0928c">SortComplete</a>(aError);
<a name="l00190"></a>00190
<a name="l00191"></a>00191 <span class="keywordflow">return</span> KErrNone;
<a name="l00192"></a>00192 }
<a name="l00193"></a>00193
<a name="l00194"></a>00194 <span class="comment">// End of file</span>
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