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Date: Tue, 15 Jun 2010 00:12:23 -0400 (EDT)
From: "Lang Yang (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Created: (HARMONY-6553) Implement
 ServiceRegistry.lookupProviders(class)
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Implement ServiceRegistry.lookupProviders(class)
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                 Key: HARMONY-6553
                 URL: https://issues.apache.org/jira/browse/HARMONY-6553
             Project: Harmony
          Issue Type: Sub-task
            Reporter: Lang Yang


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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