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1 // Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 #include "CacheBase.h" |
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17 |
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18 /** |
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19 Constructor |
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20 Initialized the iCachedItems array with granularity 8 and an offset to iHandle in TCacheEntry, |
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21 which will be used to find specific entries later. |
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22 */ |
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23 CCacheBase::CCacheBase() : iCachedItems(8, _FOFF(TCacheEntry, iHandle)) |
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24 { |
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25 |
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26 } |
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27 |
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28 CCacheBase::~CCacheBase() |
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29 { |
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30 for(TInt i = 0; i < iCachedItems.Count(); i++) |
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31 { |
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32 delete iCachedItems[i].iCachedItem; |
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33 iCachedItems[i].iCachedItem = NULL; |
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34 } |
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35 |
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36 iCachedItems.Reset(); |
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37 } |
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38 |
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39 /** |
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40 Begins an update of the cache. |
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41 */ |
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42 void CCacheBase::BeginUpdate() |
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43 { |
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44 // Sets all cached items to not used |
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45 for(TInt i = 0; i < iCachedItems.Count(); i++) |
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46 { |
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47 iCachedItems[i].iIsUsed = EFalse; |
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48 } |
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49 } |
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50 |
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51 /** |
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52 End an update of the cache. |
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53 */ |
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54 void CCacheBase::EndUpdate() |
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55 { |
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56 // Removes all cached items that are not used |
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57 for(TInt i = 0; i < iCachedItems.Count(); i++) |
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58 { |
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59 if(!iCachedItems[i].iIsUsed) |
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60 { |
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61 delete iCachedItems[i].iCachedItem; |
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62 iCachedItems.Remove(i--); |
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63 } |
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64 } |
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65 } |
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66 |
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67 /** |
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68 Returns an item from the cache corresponding to a specific handle. |
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69 |
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70 @param aHandle A handle to match against an item in the cache. |
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71 @return The item that matches the handle provided as a parameter. |
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72 */ |
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73 const CBase* CCacheBase::Resolve(TInt aHandle) |
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74 { |
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75 TCacheEntry entry(aHandle); |
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76 TInt index = iCachedItems.FindInUnsignedKeyOrder(entry); |
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77 |
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78 if(index != KErrNotFound) |
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79 return iCachedItems[index].iCachedItem; |
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80 else |
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81 return NULL; |
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82 } |
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83 |
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84 |