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Uri: use List.unmodifiable

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BUG=
R=lrn@google.com

Review URL: https://codereview.chromium.org/1406023018 .
This commit is contained in:
Stephen Adams 2015-11-04 14:30:10 -08:00
parent dbbcedf231
commit f51f25034e
1 changed files with 15 additions and 14 deletions
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29
sdk/lib/core/uri.dart
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@ -1009,26 +1009,27 @@ class Uri {
}
/**
* Returns the URI path split into its segments. Each of the
* segments in the returned list have been decoded. If the path is
* empty the empty list will be returned. A leading slash `/` does
* not affect the segments returned.
* Returns the URI path split into its segments. Each of the segments in the
* returned list have been decoded. If the path is empty the empty list will
* be returned. A leading slash `/` does not affect the segments returned.
*
* The returned list is unmodifiable and will throw [UnsupportedError] on any
* calls that would mutate it.
*/
List<String> get pathSegments {
if (_pathSegments == null) {
var pathToSplit = !path.isEmpty && path.codeUnitAt(0) == _SLASH
? path.substring(1)
: path;
_pathSegments = new UnmodifiableListView(
pathToSplit == "" ? const<String>[]
: pathToSplit.split("/")
.map(Uri.decodeComponent)
.toList(growable: false));
var result = _pathSegments;
if (result != null) return result;
var pathToSplit = path;
if (pathToSplit.isNotEmpty && pathToSplit.codeUnitAt(0) == _SLASH) {
pathToSplit = pathToSplit.substring(1);
}
return _pathSegments;
result = (pathToSplit == "")
? const<String>[]
: new List<String>.unmodifiable(
pathToSplit.split("/").map(Uri.decodeComponent));
_pathSegments = result;
return result;
}
/**