Manoj Govindassamy created HDFS-12653:
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Summary: Implement toArray() and toSubArray() for ReadOnlyList
Key: HDFS-12653
URL: https://issues.apache.org/jira/browse/HDFS-12653
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Manoj Govindassamy
Assignee: Manoj Govindassamy
{{ReadOnlyList}} today gives an unmodifiable view of the backing List. This
list supports following Util methods for easy construction of read only views
of any given list.
{noformat}
public static <E> ReadOnlyList<E> asReadOnlyList(final List<E> list)
public static <E> List<E> asList(final ReadOnlyList<E> list)
{noformat}
{{asList}} above additionally overrides {{Object[] toArray()}} of the
{{java.util.List}} interface. Unlike the {{java.util.List}}, the above one
returns an array of Objects referring to the backing list and avoid any copying
of objects. Given that we have many usages of read only lists,
1. Lets have a light-weight / shared-view {{toArray()}} implementation for
{{ReadOnlyList}} as well.
2. Additionally, similar to {{java.util.List#subList(fromIndex, toIndex)}},
lets have {{ReadOnlyList#subArray(fromIndex, toIndex)}}
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