Unmodifiable NavigableSet/NavigableMap in Java?

Posted by Greg Mattes on Stack Overflow See other posts from Stack Overflow or by Greg Mattes
Published on 2010-04-05T09:35:08Z Indexed on 2010/04/05 9:43 UTC
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java

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collections

java.util.Collections has several unmodifiable methods that provide unmodifiable collection views by wrapping collections in decorators that prohibit mutation operations.

Java 6 added support for java.util.NavigableSet and java.util.NavigableMap.

I'd like to be able to have unmodifiable NavigableSets and NavigableMaps, but java.util.Collections#unmodifiableSortedSet(SortedSet) and java.util.Collections#unmodifiableSortedMap(SortedMap) are not sufficient because they do not support the operations that are particular to NavigableSet and NavigableMap.

Are there de-facto implementations for unmodifiableNavigableSet and unmodifiableNavigableMap?

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