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https://issues.apache.org/jira/browse/COLLECTIONS-600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17489474#comment-17489474
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Gary D. Gregory commented on COLLECTIONS-600:
---------------------------------------------
Since Java is not SQL, null == null is true.
> Make CollectionUtils (in particular isEqualCollection) null-safe
> ----------------------------------------------------------------
>
> Key: COLLECTIONS-600
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-600
> Project: Commons Collections
> Issue Type: Improvement
> Components: Collection
> Affects Versions: 4.1
> Reporter: Jonas Holtkamp
> Priority: Minor
>
> Other Commons {{*Utils}} classes as StringUtils etc. feature null-safe
> methods. Why doesn't for example {{CollectionUtils#isEqualCollection}}
> include a null check, like this?
> {code} public static boolean isEqualCollection(final Collection<?> a,
> final Collection<?> b) {
> if(a == null || b == null) {
> return false;
> }
> if(a.size() != b.size()) {
> return false;
> }
> final CardinalityHelper<Object> helper = new
> CardinalityHelper<Object>(a, b);
> if(helper.cardinalityA.size() != helper.cardinalityB.size()) {
> return false;
> }
> for( final Object obj : helper.cardinalityA.keySet()) {
> if(helper.freqA(obj) != helper.freqB(obj)) {
> return false;
> }
> }
> return true;
> }
> {code}
> I considered filing a Pull Request but wanted to ask here first.
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