RFR: 8253569: javax.xml.catalog.Catalog.matchURI() implementation should reset state variables

[Naoto Sato]

On Tue, 29 Mar 2022 16:39:50 GMT, Joe Wang <joehw at openjdk.org> wrote:

> Resets state of a Catalog instance on each matching call so that it can be reused. Adjusts CatalogResolver's resolve routine so that it continues to observes the PREFER feature in a resolution process. Without the adjustment, PreferFeatureTest would fail.
> 
> Mach5 XML tests passed: https://mach5.us.oracle.com/mdash/jobs/huizwang-open-20220329-0148-30563542

src/java.xml/share/classes/javax/xml/catalog/GroupEntry.java line 44:

> 42: 
> 43:     //Indicates whether this is the Catalog instance (vs a Catalog entry)
> 44:     boolean isCatalogInstance = false;

Can we eliminate this instance variable, by checking whether the type is `Catalog` or not in `resetOnStart()`?

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PR: https://git.openjdk.java.net/jdk/pull/8018