The Tor Browser / file comparison
comparison: xpcom/ds/nsSupportsArrayEnumerator.cpp
xpcom/ds/nsSupportsArrayEnumerator.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
equal
deleted
inserted
replaced
| -1:000000000000 | 0:27b0cb0eda18 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "nsSupportsArrayEnumerator.h" | |
| 7 #include "nsISupportsArray.h" | |
| 8 | |
| 9 nsSupportsArrayEnumerator::nsSupportsArrayEnumerator(nsISupportsArray* array) | |
| 10 : mArray(array), mCursor(0) | |
| 11 { | |
| 12 NS_ASSERTION(array, "null array"); | |
| 13 NS_ADDREF(mArray); | |
| 14 } | |
| 15 | |
| 16 nsSupportsArrayEnumerator::~nsSupportsArrayEnumerator() | |
| 17 { | |
| 18 NS_RELEASE(mArray); | |
| 19 } | |
| 20 | |
| 21 NS_IMPL_ISUPPORTS(nsSupportsArrayEnumerator, nsIBidirectionalEnumerator, nsIEnumerator) | |
| 22 | |
| 23 NS_IMETHODIMP | |
| 24 nsSupportsArrayEnumerator::First() | |
| 25 { | |
| 26 mCursor = 0; | |
| 27 uint32_t cnt; | |
| 28 nsresult rv = mArray->Count(&cnt); | |
| 29 if (NS_FAILED(rv)) return rv; | |
| 30 int32_t end = (int32_t)cnt; | |
| 31 if (mCursor < end) | |
| 32 return NS_OK; | |
| 33 else | |
| 34 return NS_ERROR_FAILURE; | |
| 35 } | |
| 36 | |
| 37 NS_IMETHODIMP | |
| 38 nsSupportsArrayEnumerator::Next() | |
| 39 { | |
| 40 uint32_t cnt; | |
| 41 nsresult rv = mArray->Count(&cnt); | |
| 42 if (NS_FAILED(rv)) return rv; | |
| 43 int32_t end = (int32_t)cnt; | |
| 44 if (mCursor < end) // don't count upward forever | |
| 45 mCursor++; | |
| 46 if (mCursor < end) | |
| 47 return NS_OK; | |
| 48 else | |
| 49 return NS_ERROR_FAILURE; | |
| 50 } | |
| 51 | |
| 52 NS_IMETHODIMP | |
| 53 nsSupportsArrayEnumerator::CurrentItem(nsISupports **aItem) | |
| 54 { | |
| 55 NS_ASSERTION(aItem, "null out parameter"); | |
| 56 uint32_t cnt; | |
| 57 nsresult rv = mArray->Count(&cnt); | |
| 58 if (NS_FAILED(rv)) return rv; | |
| 59 if (mCursor >= 0 && mCursor < (int32_t)cnt) { | |
| 60 return mArray->GetElementAt(mCursor, aItem); | |
| 61 } | |
| 62 return NS_ERROR_FAILURE; | |
| 63 } | |
| 64 | |
| 65 NS_IMETHODIMP | |
| 66 nsSupportsArrayEnumerator::IsDone() | |
| 67 { | |
| 68 uint32_t cnt; | |
| 69 nsresult rv = mArray->Count(&cnt); | |
| 70 if (NS_FAILED(rv)) return rv; | |
| 71 // XXX This is completely incompatible with the meaning of nsresult. | |
| 72 // NS_ENUMERATOR_FALSE is defined to be 1. (bug 778111) | |
| 73 return (mCursor >= 0 && mCursor < (int32_t)cnt) | |
| 74 ? (nsresult)NS_ENUMERATOR_FALSE : NS_OK; | |
| 75 } | |
| 76 | |
| 77 //////////////////////////////////////////////////////////////////////////////// | |
| 78 | |
| 79 NS_IMETHODIMP | |
| 80 nsSupportsArrayEnumerator::Last() | |
| 81 { | |
| 82 uint32_t cnt; | |
| 83 nsresult rv = mArray->Count(&cnt); | |
| 84 if (NS_FAILED(rv)) return rv; | |
| 85 mCursor = cnt - 1; | |
| 86 return NS_OK; | |
| 87 } | |
| 88 | |
| 89 NS_IMETHODIMP | |
| 90 nsSupportsArrayEnumerator::Prev() | |
| 91 { | |
| 92 if (mCursor >= 0) | |
| 93 --mCursor; | |
| 94 if (mCursor >= 0) | |
| 95 return NS_OK; | |
| 96 else | |
| 97 return NS_ERROR_FAILURE; | |
| 98 } | |
| 99 |
