Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_example_resolver_8cpp_source.html
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<h1>examples/SysLibs/ECom/InterfaceDefinition/ExampleResolver.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
<a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span>
<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
<a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
<a name="l00010"></a>00010 <span class="comment">//</span>
<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
<a name="l00012"></a>00012 <span class="comment">//</span>
<a name="l00013"></a>00013 <span class="comment">// Description:</span>
<a name="l00014"></a>00014 <span class="comment">//</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="preprocessor">#include <ecom.h></span>
<a name="l00018"></a>00018 <span class="preprocessor">#include <ecomerrorcodes.h></span>
<a name="l00019"></a>00019 <span class="preprocessor">#include <ecomresolverparams.h></span>
<a name="l00020"></a>00020 <span class="preprocessor">#include <implementationinformation.h></span>
<a name="l00021"></a>00021 <span class="preprocessor">#include <publicregistry.h></span>
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="preprocessor">#include "ExampleResolver.h"</span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <a class="code" href="class_c_example_resolver.html">CExampleResolver</a>* CExampleResolver::NewL(MPublicRegistry& aRegistry)
<a name="l00026"></a>00026 {
<a name="l00027"></a>00027 <span class="keywordflow">return</span> <span class="keyword">new</span>(ELeave) <a class="code" href="class_c_example_resolver.html">CExampleResolver</a>(aRegistry);
<a name="l00028"></a>00028 }
<a name="l00029"></a>00029
<a name="l00030"></a>00030 CExampleResolver::~CExampleResolver()
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032 <span class="keywordflow">if</span>(iImplementationInfoArray)
<a name="l00033"></a>00033 {
<a name="l00034"></a>00034 iImplementationInfoArray->Reset();
<a name="l00035"></a>00035 <span class="keyword">delete</span> iImplementationInfoArray;
<a name="l00036"></a>00036 }
<a name="l00037"></a>00037 }
<a name="l00038"></a>00038
<a name="l00039"></a>00039 CExampleResolver::CExampleResolver(MPublicRegistry& aRegistry)
<a name="l00040"></a>00040 : CResolver(aRegistry)
<a name="l00041"></a>00041 {
<a name="l00042"></a>00042 <span class="comment">// Do nothing here</span>
<a name="l00043"></a>00043 }
<a name="l00044"></a>00044
<a name="l00045"></a><a class="code" href="class_c_example_resolver.html#a69f86a4e738658a27f4140d047ab1c6d">00045</a> TUid <a class="code" href="class_c_example_resolver.html#a69f86a4e738658a27f4140d047ab1c6d">CExampleResolver::IdentifyImplementationL</a>(TUid aInterfaceUid,
<a name="l00046"></a>00046 <span class="keyword">const</span> TEComResolverParams& aAdditionalParameters)<span class="keyword"> const</span>
<a name="l00047"></a>00047 <span class="keyword"> </span>{
<a name="l00048"></a>00048 RImplInfoArray& implementationsInfo = iRegistry.ListImplementationsL(aInterfaceUid);
<a name="l00049"></a>00049 TUid found = KNullUid;
<a name="l00050"></a>00050 <span class="keywordflow">if</span>(implementationsInfo.Count())
<a name="l00051"></a>00051 {
<a name="l00052"></a>00052 found = Resolve(implementationsInfo, aAdditionalParameters);
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054 <span class="keywordflow">return</span> found;
<a name="l00055"></a>00055 }
<a name="l00056"></a>00056
<a name="l00057"></a>00057 TUid CExampleResolver::Resolve(<span class="keyword">const</span> RImplInfoArray& aImplementationsInfo,
<a name="l00058"></a>00058 <span class="keyword">const</span> TEComResolverParams& aAdditionalParameters)<span class="keyword"> const</span>
<a name="l00059"></a>00059 <span class="keyword"> </span>{
<a name="l00060"></a>00060 <span class="comment">// Loop through the implementations matching on type</span>
<a name="l00061"></a>00061 <span class="keyword">const</span> TInt count = aImplementationsInfo.Count();
<a name="l00062"></a>00062 <span class="keywordflow">for</span>(TInt index = 0; index < count; ++index)
<a name="l00063"></a>00063 {
<a name="l00064"></a>00064 <span class="keyword">const</span> CImplementationInformation& impData = *aImplementationsInfo[index];
<a name="l00065"></a>00065 <span class="comment">// As soon as we get a match on the datatype then return uid of the </span>
<a name="l00066"></a>00066 <span class="comment">// implementation found.</span>
<a name="l00067"></a>00067 <span class="keywordflow">if</span> (Match(impData.DataType(), <span class="comment">// The Datatype of this implementation</span>
<a name="l00068"></a>00068 aAdditionalParameters.DataType(), <span class="comment">// The type we are trying to find</span>
<a name="l00069"></a>00069 aAdditionalParameters.IsWildcardMatch())) <span class="comment">// If wildcards should be used</span>
<a name="l00070"></a>00070 <span class="keywordflow">return</span> impData.ImplementationUid();
<a name="l00071"></a>00071 }
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <span class="keywordflow">return</span> KNullUid;
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075
<a name="l00076"></a><a class="code" href="class_c_example_resolver.html#ade80c48bb5089b04715bf3d4e192331f">00076</a> RImplInfoArray* <a class="code" href="class_c_example_resolver.html#ade80c48bb5089b04715bf3d4e192331f">CExampleResolver::ListAllL</a>(TUid aInterfaceUid,
<a name="l00077"></a>00077 <span class="keyword">const</span> TEComResolverParams& aAdditionalParameters)<span class="keyword"> const</span>
<a name="l00078"></a>00078 <span class="keyword"> </span>{
<a name="l00079"></a>00079 <span class="comment">// Use the member var to create the array so that we get proper cleanup behaviour</span>
<a name="l00080"></a>00080 iImplementationInfoArray = <span class="keyword">new</span>(ELeave) RImplInfoArray;
<a name="l00081"></a>00081 RImplInfoArray* retList = iImplementationInfoArray;
<a name="l00082"></a>00082
<a name="l00083"></a>00083 RImplInfoArray& fullList = iRegistry.ListImplementationsL(aInterfaceUid);
<a name="l00084"></a>00084
<a name="l00085"></a>00085 <span class="keyword">const</span> TBool useWildcards = aAdditionalParameters.IsWildcardMatch();
<a name="l00086"></a>00086 <span class="keyword">const</span> TDesC8& matchType = aAdditionalParameters.DataType();
<a name="l00087"></a>00087 <span class="keyword">const</span> TInt numImps = fullList.Count();
<a name="l00088"></a>00088 <span class="keywordflow">for</span>(TInt index = 0; index < numImps; ++index)
<a name="l00089"></a>00089 {
<a name="l00090"></a>00090 <span class="keywordflow">if</span>(Match(fullList[index]->DataType(), matchType, useWildcards))
<a name="l00091"></a>00091 {
<a name="l00092"></a>00092 User::LeaveIfError(retList->Append(fullList[index]));
<a name="l00093"></a>00093 }
<a name="l00094"></a>00094 }
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <span class="comment">// Reset the member variable because we are passing ownership back</span>
<a name="l00097"></a>00097 iImplementationInfoArray = NULL;
<a name="l00098"></a>00098 <span class="keywordflow">return</span> retList;
<a name="l00099"></a>00099 }
<a name="l00100"></a>00100
<a name="l00101"></a>00101 TBool CExampleResolver::Match(<span class="keyword">const</span> TDesC8& aImplementationType,
<a name="l00102"></a>00102 <span class="keyword">const</span> TDesC8& aMatchType,
<a name="l00103"></a>00103 TBool aUseWildcards)<span class="keyword"> const</span>
<a name="l00104"></a>00104 <span class="keyword"> </span>{
<a name="l00105"></a>00105 TInt matchPos = KErrNotFound;
<a name="l00106"></a>00106
<a name="l00107"></a>00107 _LIT8(dataSeparator, <span class="stringliteral">"||"</span>);
<a name="l00108"></a>00108 <span class="keyword">const</span> TInt separatorLength = dataSeparator().Length();
<a name="l00109"></a>00109
<a name="l00110"></a>00110 <span class="comment">// Look for the section separator marker '||'</span>
<a name="l00111"></a>00111 TInt separatorPos = aImplementationType.Find(dataSeparator);
<a name="l00112"></a>00112 <span class="keywordflow">if</span>(separatorPos == KErrNotFound)
<a name="l00113"></a>00113 {
<a name="l00114"></a>00114 <span class="comment">// Match against the whole string</span>
<a name="l00115"></a>00115 <span class="keywordflow">if</span>(aUseWildcards)
<a name="l00116"></a>00116 matchPos = aImplementationType.Match(aMatchType);
<a name="l00117"></a>00117 <span class="keywordflow">else</span>
<a name="l00118"></a>00118 matchPos = aImplementationType.Compare(aMatchType);
<a name="l00119"></a>00119 }
<a name="l00120"></a>00120 <span class="keywordflow">else</span>
<a name="l00121"></a>00121 {
<a name="l00122"></a>00122 <span class="comment">// Find the first section, up to the separator</span>
<a name="l00123"></a>00123 TPtrC8 dataSection = aImplementationType.Left(separatorPos);
<a name="l00124"></a>00124 TPtrC8 remainingData = aImplementationType.Mid(separatorPos + separatorLength);
<a name="l00125"></a>00125 <span class="comment">// Match against each section in turn</span>
<a name="l00126"></a>00126 <span class="keywordflow">while</span>(separatorPos != KErrNotFound)
<a name="l00127"></a>00127 {
<a name="l00128"></a>00128 <span class="comment">// Search this section</span>
<a name="l00129"></a>00129 <span class="keywordflow">if</span>(aUseWildcards)
<a name="l00130"></a>00130 matchPos = dataSection.Match(aMatchType);
<a name="l00131"></a>00131 <span class="keywordflow">else</span>
<a name="l00132"></a>00132 matchPos = dataSection.Compare(aMatchType);
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="comment">// If we found it then no need to continue, so return</span>
<a name="l00135"></a>00135 <span class="keywordflow">if</span>(matchPos != KErrNotFound)
<a name="l00136"></a>00136 <span class="keywordflow">return</span> ETrue;
<a name="l00137"></a>00137
<a name="l00138"></a>00138 <span class="comment">// Move on to the next section</span>
<a name="l00139"></a>00139 separatorPos = remainingData.Find(dataSeparator);
<a name="l00140"></a>00140 <span class="keywordflow">if</span>(separatorPos != KErrNotFound)
<a name="l00141"></a>00141 {
<a name="l00142"></a>00142 dataSection.Set(remainingData.Left(separatorPos));
<a name="l00143"></a>00143 remainingData.Set(remainingData.Mid(separatorPos + separatorLength));
<a name="l00144"></a>00144 }
<a name="l00145"></a>00145 <span class="keywordflow">else</span>
<a name="l00146"></a>00146 dataSection.Set(remainingData);
<a name="l00147"></a>00147 }
<a name="l00148"></a>00148
<a name="l00149"></a>00149 <span class="comment">// Check the final part</span>
<a name="l00150"></a>00150 <span class="keywordflow">if</span>(aUseWildcards)
<a name="l00151"></a>00151 matchPos = dataSection.Match(aMatchType);
<a name="l00152"></a>00152 <span class="keywordflow">else</span>
<a name="l00153"></a>00153 matchPos = dataSection.Compare(aMatchType);
<a name="l00154"></a>00154
<a name="l00155"></a>00155 }
<a name="l00156"></a>00156 <span class="keywordflow">return</span> matchPos != KErrNotFound;
<a name="l00157"></a>00157 }
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