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1 /* |
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2 * Copyright (c) 2002-2006 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0"" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: Provides directory listing cache |
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15 * |
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16 */ |
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17 |
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18 |
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19 |
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20 // INCLUDE FILES |
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21 #include "CGflmDirectoryListingCache.h" |
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22 #include "GFLM.hrh" |
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23 #include "GflmUtils.h" |
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24 #ifndef SYMBIAN_ENABLE_SPLIT_HEADERS |
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25 #include <f32file.h> |
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26 #else |
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27 #include <f32file.h> |
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28 #include <f32file_private.h> |
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29 #endif |
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30 #include <e32std.h> |
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31 |
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32 |
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33 // CONSTANTS |
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34 const TInt KListingGranularity = 0x2000; // 8KB |
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35 |
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36 |
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37 // ============================ MEMBER FUNCTIONS =============================== |
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38 |
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39 // ----------------------------------------------------------------------------- |
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40 // CGflmDirectoryListingCache::CGflmDirectoryListingCache |
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41 // C++ default constructor can NOT contain any code, that |
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42 // might leave. |
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43 // ----------------------------------------------------------------------------- |
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44 // |
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45 CGflmDirectoryListingCache::CGflmDirectoryListingCache( |
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46 RFs& aFss, |
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47 const TBool& aCancelIndicator ) : |
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48 iFss( aFss ), |
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49 iCancelIndicator( aCancelIndicator ) |
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50 { |
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51 } |
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52 |
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53 // ----------------------------------------------------------------------------- |
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54 // CGflmDirectoryListingCache::NewL |
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55 // Two-phased constructor. |
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56 // ----------------------------------------------------------------------------- |
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57 // |
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58 CGflmDirectoryListingCache* CGflmDirectoryListingCache::NewL( |
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59 RFs& aFss, |
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60 const TBool& aCancelIndicator ) |
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61 { |
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62 return new( ELeave ) CGflmDirectoryListingCache( |
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63 aFss, aCancelIndicator ); |
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64 } |
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65 |
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66 // ----------------------------------------------------------------------------- |
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67 // CGflmDirectoryListingCache::~CGflmDirectoryListingCache() |
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68 // ----------------------------------------------------------------------------- |
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69 // |
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70 CGflmDirectoryListingCache::~CGflmDirectoryListingCache() |
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71 { |
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72 delete iCache; |
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73 } |
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74 |
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75 // ----------------------------------------------------------------------------- |
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76 // CGflmDirectoryListingCache::ClearCache() |
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77 // ----------------------------------------------------------------------------- |
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78 // |
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79 void CGflmDirectoryListingCache::ClearCache() |
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80 { |
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81 iClearCache = ETrue; |
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82 } |
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83 |
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84 // ----------------------------------------------------------------------------- |
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85 // CGflmDirectoryListingCache::ListingL() |
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86 // Looks if a directory's listing is already loaded and returns it. If the |
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87 // the listing is not found, it's read and added to the cache. |
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88 // (other items were commented in a header). |
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89 // ----------------------------------------------------------------------------- |
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90 // |
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91 const CGflmDirectoryListingCache::CEntryArray* |
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92 CGflmDirectoryListingCache::ListingL( const TDesC& aDirectory ) |
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93 { |
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94 |
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95 TIMESTAMP( "GFLM listing fetch started: " ) |
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96 |
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97 // Clear directory cache first if needed |
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98 if ( iClearCache ) |
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99 { |
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100 delete iCache; |
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101 iCache = NULL; |
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102 iClearCache = EFalse; |
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103 } |
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104 |
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105 // Check if directory is already cached |
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106 TBool found( EFalse ); |
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107 if ( iCache && !aDirectory.Compare( *( iCache->iDirectory ) ) ) |
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108 { |
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109 found = ETrue; |
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110 } |
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111 |
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112 if ( !found ) |
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113 { |
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114 // Read directory to cache |
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115 CListingNamePair* newPair = CListingNamePair::NewLC( aDirectory ); |
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116 GetDirL( *newPair ); |
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117 CleanupStack::Pop( newPair ); |
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118 delete iCache; |
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119 iCache = NULL; |
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120 iCache = newPair; |
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121 } |
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122 |
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123 TIMESTAMP( "GFLM listing fetch ended: " ) |
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124 |
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125 return iCache->iListing; |
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126 } |
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127 |
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128 // ----------------------------------------------------------------------------- |
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129 // CGflmDirectoryListingCache::GetDirL |
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130 // ----------------------------------------------------------------------------- |
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131 // |
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132 void CGflmDirectoryListingCache::GetDirL( CListingNamePair& aPair ) |
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133 { |
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134 RDir dir; |
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135 User::LeaveIfError( dir.Open( |
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136 iFss, |
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137 *aPair.iDirectory, |
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138 KEntryAttNormal | KEntryAttDir ) ); |
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139 CleanupClosePushL( dir ); |
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140 |
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141 TInt err( KErrNone ); |
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142 |
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143 do |
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144 { |
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145 if ( iCancelIndicator ) |
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146 { |
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147 // User has canceled the operation, abort |
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148 User::Leave( KErrCancel ); |
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149 } |
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150 |
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151 err = dir.Read( iEntryBuffer ); |
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152 if ( err == KErrNone || err == KErrEof ) |
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153 { |
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154 TInt entryCount( iEntryBuffer.Count() ); |
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155 if ( !entryCount ) |
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156 { |
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157 break; |
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158 } |
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159 for ( TInt i( 0 ); i < entryCount; i++ ) |
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160 { |
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161 const TEntry& entry( iEntryBuffer[ i ] ); |
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162 TInt entrySize( EntrySize( entry, ETrue ) ); |
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163 aPair.iListing->AppendL( entry, entrySize ); |
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164 } |
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165 } |
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166 |
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167 }while ( err == KErrNone ); |
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168 |
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169 if ( err != KErrNone && err != KErrEof ) |
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170 { |
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171 User::Leave( err ); |
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172 } |
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173 |
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174 CleanupStack::PopAndDestroy( &dir ); |
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175 } |
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176 |
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177 // ----------------------------------------------------------------------------- |
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178 // CGflmDirectoryListingCache::CListingNamePair::~CListingNamePair() |
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179 // ----------------------------------------------------------------------------- |
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180 // |
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181 CGflmDirectoryListingCache::CListingNamePair::~CListingNamePair() |
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182 { |
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183 delete iDirectory; |
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184 |
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185 if ( iListing ) |
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186 { |
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187 iListing->Reset(); |
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188 delete iListing; |
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189 } |
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190 } |
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191 |
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192 // ----------------------------------------------------------------------------- |
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193 // CGflmDirectoryListingCache::CListingNamePair::ConstructL() |
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194 // ----------------------------------------------------------------------------- |
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195 // |
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196 void CGflmDirectoryListingCache::CListingNamePair::ConstructL( |
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197 const TDesC& aDirectory ) |
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198 { |
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199 iDirectory = aDirectory.AllocL(); |
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200 iListing = new( ELeave ) CEntryArray( KListingGranularity ); |
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201 } |
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202 |
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203 // ----------------------------------------------------------------------------- |
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204 // CGflmDirectoryListingCache::CListingNamePair::NewLC() |
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205 // ----------------------------------------------------------------------------- |
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206 // |
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207 CGflmDirectoryListingCache::CListingNamePair* |
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208 CGflmDirectoryListingCache::CListingNamePair::NewLC( |
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209 const TDesC& aDirectory ) |
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210 { |
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211 CListingNamePair* self = new ( ELeave ) CListingNamePair(); |
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212 CleanupStack::PushL( self ); |
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213 self->ConstructL( aDirectory ); |
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214 return self; |
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215 } |
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216 |
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217 // End of File |