1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/xpcom/ds/nsSupportsArrayEnumerator.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,99 @@
1.4 +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "nsSupportsArrayEnumerator.h"
1.10 +#include "nsISupportsArray.h"
1.11 +
1.12 +nsSupportsArrayEnumerator::nsSupportsArrayEnumerator(nsISupportsArray* array)
1.13 + : mArray(array), mCursor(0)
1.14 +{
1.15 + NS_ASSERTION(array, "null array");
1.16 + NS_ADDREF(mArray);
1.17 +}
1.18 +
1.19 +nsSupportsArrayEnumerator::~nsSupportsArrayEnumerator()
1.20 +{
1.21 + NS_RELEASE(mArray);
1.22 +}
1.23 +
1.24 +NS_IMPL_ISUPPORTS(nsSupportsArrayEnumerator, nsIBidirectionalEnumerator, nsIEnumerator)
1.25 +
1.26 +NS_IMETHODIMP
1.27 +nsSupportsArrayEnumerator::First()
1.28 +{
1.29 + mCursor = 0;
1.30 + uint32_t cnt;
1.31 + nsresult rv = mArray->Count(&cnt);
1.32 + if (NS_FAILED(rv)) return rv;
1.33 + int32_t end = (int32_t)cnt;
1.34 + if (mCursor < end)
1.35 + return NS_OK;
1.36 + else
1.37 + return NS_ERROR_FAILURE;
1.38 +}
1.39 +
1.40 +NS_IMETHODIMP
1.41 +nsSupportsArrayEnumerator::Next()
1.42 +{
1.43 + uint32_t cnt;
1.44 + nsresult rv = mArray->Count(&cnt);
1.45 + if (NS_FAILED(rv)) return rv;
1.46 + int32_t end = (int32_t)cnt;
1.47 + if (mCursor < end) // don't count upward forever
1.48 + mCursor++;
1.49 + if (mCursor < end)
1.50 + return NS_OK;
1.51 + else
1.52 + return NS_ERROR_FAILURE;
1.53 +}
1.54 +
1.55 +NS_IMETHODIMP
1.56 +nsSupportsArrayEnumerator::CurrentItem(nsISupports **aItem)
1.57 +{
1.58 + NS_ASSERTION(aItem, "null out parameter");
1.59 + uint32_t cnt;
1.60 + nsresult rv = mArray->Count(&cnt);
1.61 + if (NS_FAILED(rv)) return rv;
1.62 + if (mCursor >= 0 && mCursor < (int32_t)cnt) {
1.63 + return mArray->GetElementAt(mCursor, aItem);
1.64 + }
1.65 + return NS_ERROR_FAILURE;
1.66 +}
1.67 +
1.68 +NS_IMETHODIMP
1.69 +nsSupportsArrayEnumerator::IsDone()
1.70 +{
1.71 + uint32_t cnt;
1.72 + nsresult rv = mArray->Count(&cnt);
1.73 + if (NS_FAILED(rv)) return rv;
1.74 + // XXX This is completely incompatible with the meaning of nsresult.
1.75 + // NS_ENUMERATOR_FALSE is defined to be 1. (bug 778111)
1.76 + return (mCursor >= 0 && mCursor < (int32_t)cnt)
1.77 + ? (nsresult)NS_ENUMERATOR_FALSE : NS_OK;
1.78 +}
1.79 +
1.80 +////////////////////////////////////////////////////////////////////////////////
1.81 +
1.82 +NS_IMETHODIMP
1.83 +nsSupportsArrayEnumerator::Last()
1.84 +{
1.85 + uint32_t cnt;
1.86 + nsresult rv = mArray->Count(&cnt);
1.87 + if (NS_FAILED(rv)) return rv;
1.88 + mCursor = cnt - 1;
1.89 + return NS_OK;
1.90 +}
1.91 +
1.92 +NS_IMETHODIMP
1.93 +nsSupportsArrayEnumerator::Prev()
1.94 +{
1.95 + if (mCursor >= 0)
1.96 + --mCursor;
1.97 + if (mCursor >= 0)
1.98 + return NS_OK;
1.99 + else
1.100 + return NS_ERROR_FAILURE;
1.101 +}
1.102 +
