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-rw-r--r--xpcom/ds/nsSupportsArrayEnumerator.cpp131
1 files changed, 131 insertions, 0 deletions
diff --git a/xpcom/ds/nsSupportsArrayEnumerator.cpp b/xpcom/ds/nsSupportsArrayEnumerator.cpp
new file mode 100644
index 000000000..3eb6a7a58
--- /dev/null
+++ b/xpcom/ds/nsSupportsArrayEnumerator.cpp
@@ -0,0 +1,131 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsSupportsArrayEnumerator.h"
+
+// Disable deprecation warnings generated by nsISupportsArray and associated
+// classes.
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#elif defined(_MSC_VER)
+#pragma warning (push)
+#pragma warning (disable : 4996)
+#endif
+
+#include "nsISupportsArray.h"
+
+nsSupportsArrayEnumerator::nsSupportsArrayEnumerator(nsISupportsArray* array)
+ : mArray(array)
+ , mCursor(0)
+{
+ NS_ASSERTION(array, "null array");
+}
+
+nsSupportsArrayEnumerator::~nsSupportsArrayEnumerator()
+{
+}
+
+NS_IMPL_ISUPPORTS(nsSupportsArrayEnumerator, nsIBidirectionalEnumerator,
+ nsIEnumerator)
+
+NS_IMETHODIMP
+nsSupportsArrayEnumerator::First()
+{
+ mCursor = 0;
+ uint32_t cnt;
+ nsresult rv = mArray->Count(&cnt);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ int32_t end = (int32_t)cnt;
+ if (mCursor < end) {
+ return NS_OK;
+ } else {
+ return NS_ERROR_FAILURE;
+ }
+}
+
+NS_IMETHODIMP
+nsSupportsArrayEnumerator::Next()
+{
+ uint32_t cnt;
+ nsresult rv = mArray->Count(&cnt);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ int32_t end = (int32_t)cnt;
+ if (mCursor < end) { // don't count upward forever
+ mCursor++;
+ }
+ if (mCursor < end) {
+ return NS_OK;
+ } else {
+ return NS_ERROR_FAILURE;
+ }
+}
+
+NS_IMETHODIMP
+nsSupportsArrayEnumerator::CurrentItem(nsISupports** aItem)
+{
+ NS_ASSERTION(aItem, "null out parameter");
+ uint32_t cnt;
+ nsresult rv = mArray->Count(&cnt);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ if (mCursor >= 0 && mCursor < (int32_t)cnt) {
+ return mArray->GetElementAt(mCursor, aItem);
+ }
+ return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsSupportsArrayEnumerator::IsDone()
+{
+ uint32_t cnt;
+ nsresult rv = mArray->Count(&cnt);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ // XXX This is completely incompatible with the meaning of nsresult.
+ // NS_ENUMERATOR_FALSE is defined to be 1. (bug 778111)
+ return (mCursor >= 0 && mCursor < (int32_t)cnt)
+ ? (nsresult)NS_ENUMERATOR_FALSE : NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+NS_IMETHODIMP
+nsSupportsArrayEnumerator::Last()
+{
+ uint32_t cnt;
+ nsresult rv = mArray->Count(&cnt);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ mCursor = cnt - 1;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSupportsArrayEnumerator::Prev()
+{
+ if (mCursor >= 0) {
+ --mCursor;
+ }
+ if (mCursor >= 0) {
+ return NS_OK;
+ } else {
+ return NS_ERROR_FAILURE;
+ }
+}
+
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#elif defined(_MSC_VER)
+#pragma warning (pop)
+#endif