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From "Alexandr Klimov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (XMLSCHEMA-30) Each type from W3C base schema (http://www.w3.org/2001/XMLSchema) is equals to each other
Date Mon, 06 Jan 2014 14:55:50 GMT
Alexandr Klimov created XMLSCHEMA-30:
----------------------------------------

             Summary: Each type from W3C base schema (http://www.w3.org/2001/XMLSchema) is
equals to each other
                 Key: XMLSCHEMA-30
                 URL: https://issues.apache.org/jira/browse/XMLSCHEMA-30
             Project: XmlSchema
          Issue Type: Bug
    Affects Versions: 2.0.2, 2.0.3, 2.0.4
         Environment: Oracle JDK-1.6
Oracle JDK-1.7
            Reporter: Alexandr Klimov
            Priority: Critical


h2. MAIN DESCIPRTION
At this time, all simple types of the base xml schema _( W3C Schema has namesapce http://www.w3.org/2001/XMLSchema
)_ *always equlals to each other* from point of view *Object@equals* method, but they have
different hash codes.
I've attched a simple sample_proj.zip project to be more clean.


Such situation *may lead to wrong behaviour* of some Set or Map implementations.
F.e. ImmutableSet of Guava project doesn't copy all items from java.util.HashSet over creation
operation _( ImmutableSet#copyOf )_

*Moreover*, such behaviuor isn't in accordance with [Oracle rules|http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html#hashCode()]

h2. DETAILS
Comparison of a XmlSchemaType (both simple and complex) is performed by *XmlSchemaObject#equals*
method.
This method takes in account folowing properties of a XmlSchemaObject:
* lineNumber
* linePosition
* sourceURI

But all base W3C xsd types _(namespace http://www.w3.org/2001/XMLSchema )_ has one peculiarity:
all the above properties is not set throughout base W3C schema creation.

*XmlSchemaCollection#addSimpletype* method is responsible for creation all these base schema
simple types.

In result, all these "synthatic" types may be distinguished by they QNames only.

h2. SIGGESTION
I suggest to override *equals* method on *XmlSchemaType* class with taking in account its
*namedDelegate* field comparison result.
 




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