|
1 // Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies). |
|
2 // All rights reserved. |
|
3 // This component and the accompanying materials are made available |
|
4 // under the terms of "Eclipse Public License v1.0" |
|
5 // which accompanies this distribution, and is available |
|
6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
7 // |
|
8 // Initial Contributors: |
|
9 // Nokia Corporation - initial contribution. |
|
10 // |
|
11 // Contributors: |
|
12 // |
|
13 // Description: |
|
14 // |
|
15 |
|
16 |
|
17 #include "rotatingstrbuf.h" |
|
18 |
|
19 CRotatingStrBuf* CRotatingStrBuf::NewL(TInt aSize) |
|
20 { |
|
21 CRotatingStrBuf *self = new (ELeave) CRotatingStrBuf; |
|
22 CleanupStack::PushL(self); |
|
23 self->ConstructL(aSize); |
|
24 CleanupStack::Pop(); |
|
25 return self; |
|
26 } |
|
27 |
|
28 CRotatingStrBuf::~CRotatingStrBuf() |
|
29 { |
|
30 TEntry* entry; |
|
31 while (!iQueue.IsEmpty()) |
|
32 { |
|
33 entry = iQueue.First(); |
|
34 entry->iLink.Deque(); |
|
35 delete entry->iText; |
|
36 delete entry; |
|
37 } |
|
38 } |
|
39 |
|
40 CRotatingStrBuf::CRotatingStrBuf() |
|
41 :iQueue(_FOFF(TEntry,iLink)) |
|
42 { |
|
43 } |
|
44 |
|
45 void CRotatingStrBuf::ConstructL(TInt aSize) |
|
46 { |
|
47 for(TInt cnt=0; cnt<aSize; cnt++) |
|
48 { |
|
49 TEntry* entry = new (ELeave) TEntry; |
|
50 entry->iText = NULL; |
|
51 iQueue.AddLast(*entry); |
|
52 } |
|
53 } |
|
54 |
|
55 void CRotatingStrBuf::Put(const TDesC& aText) |
|
56 { |
|
57 TEntry* entry = iQueue.Last(); |
|
58 // move last entry to the top of the queue |
|
59 entry->iLink.Deque(); |
|
60 iQueue.AddFirst(*entry); |
|
61 // alocate/resize buffer |
|
62 if (entry->iText == NULL) |
|
63 entry->iText = HBufC::New(aText.Length()); |
|
64 else if (entry->iText->Des().MaxLength() < aText.Length()) |
|
65 entry->iText = entry->iText->ReAlloc(aText.Length()); |
|
66 // copy the text |
|
67 if (entry->iText != NULL) // New or ReAlloc may have fail. |
|
68 *entry->iText = aText; |
|
69 } |
|
70 |
|
71 HBufC* CRotatingStrBuf::Get() |
|
72 { |
|
73 TDblQueIter<TEntry> iter(iQueue); |
|
74 iter.SetToLast(); |
|
75 |
|
76 TEntry* entry; |
|
77 while ((entry = iter--) != NULL && entry->iText == NULL) |
|
78 {}; |
|
79 |
|
80 if (entry != NULL) |
|
81 { |
|
82 HBufC* ret = entry->iText; |
|
83 entry->iText = NULL; |
|
84 return ret; |
|
85 } |
|
86 return NULL; |
|
87 } |
|
88 |