[jira] Commented: (HARMONY-6553) Implement ServiceRegistry.lookupProviders(class)

["Alexei Fedotov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HARMONY-6553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12878893#action_12878893 ] 

Alexei Fedotov commented on HARMONY-6553:
-----------------------------------------

Lang, is there anything in common between two implementations? I believe there should be something in common, for example, features described by the specification. 

Could you create a unit test from your "TestLookupProviders"? As you said, there could be some behavior difference which the test should ignore. You may ignore particular class names, and check only their existence, or their allowed MIME types regardless of their order.



> Implement ServiceRegistry.lookupProviders(class)
> ------------------------------------------------
>
>                 Key: HARMONY-6553
>                 URL: https://issues.apache.org/jira/browse/HARMONY-6553
>             Project: Harmony
>          Issue Type: Sub-task
>            Reporter: Lang Yang
>         Attachments: HARMONY-6553.diff, TestLookupProviders.java
>
>
> spec - http://java.sun.com/j2se/1.4.2/docs/api/javax/imageio/spi/ServiceRegistry.html#lookupProviders(java.lang.Class)
> I have created a new Iterator - "private static class LookupProvidersIterator implements Iterator" for this method. The iterator needs to instantiates new objects and throws ServiceConfigurationError exception at runtime, so we have to use customized Iterator.
> The flow: 
> 1. call ClassLoader.getResourse(String) to get a set of provider-configuration files that related to the specified class.
> 2. The iterator parses all provider-configuration files to get the names of provider classes
>     - Provider-Configuration File spec: http://java.sun.com/j2se/1.5.0/docs/guide/jar/jar.html#Provider Configuration File
> 3. In LookupProvidersIterator.next(), instantiate objects

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