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https://issues.apache.org/jira/browse/FUNCTOR-8?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bruno P. Kinoshita updated FUNCTOR-8:
-------------------------------------
Attachment: FUNCTOR-8.patch
A fix for the NPE in TransformedGenerator.
> [PATCH] Possible NPE in TransformedGenerator if getWrappedGenerator() is
> overridden to return null
> --------------------------------------------------------------------------------------------------
>
> Key: FUNCTOR-8
> URL: https://issues.apache.org/jira/browse/FUNCTOR-8
> Project: Commons Functor
> Issue Type: Bug
> Environment: ubuntu 11.10, sun-jdk-6, eclipse galileo
> Reporter: Bruno P. Kinoshita
> Attachments: FUNCTOR-8.patch
>
>
> If we override getWrappedGenerator method in TransformedGenerator to return
> null, it may result in a NullPointerException if hashCode is called.
> Attached the patch for it, and below a snippet of code to reproduce this
> issue.
> TransformedGenerator<Integer, Integer> t = new
> TransformedGenerator<Integer, Integer>(
> new IntegerRange(1, 10), new UnaryFunction<Integer, Integer>() {
> public Integer evaluate(Integer obj) {
> return obj += 1;
> }
> }) {
> @Override
> protected Generator<? extends Integer> getWrappedGenerator() {
> return null;
> }
> };
> TransformedGenerator<Integer, Integer> t2 = new
> TransformedGenerator<Integer, Integer>(
> new IntegerRange(1, 10), new UnaryFunction<Integer, Integer>() {
> public Integer evaluate(Integer obj) {
> return obj -= 1;
> }
> });
> System.out.println(t.equals(t2));
> System.out.println(t.hashCode() == t2.hashCode()); // NPE
> Cheers,
> Bruno P. Kinoshita
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