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List:       xmlbeans-dev
Subject:    [jira] Resolved: (XMLBEANS-66) NullPointerException when restricting a union with one of the union m
From:       xmlbeans-dev () xml ! apache ! org
Date:       2004-10-23 2:42:46
Message-ID: 780535913.1098499366554.JavaMail.apache () nagoya
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Message:

   The following issue has been resolved as FIXED.

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View the issue:
  http://issues.apache.org/jira/browse/XMLBEANS-66

Here is an overview of the issue:
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        Key: XMLBEANS-66
    Summary: NullPointerException when restricting a union with one of the union \
members  Type: Bug

     Status: Resolved
   Priority: Major
 Resolution: FIXED

    Project: XMLBeans
 Components: 
             Compiler
   Fix Fors:
             Version 2 Beta 1
   Versions:
             Version 2

   Assignee: Jacob Danner
   Reporter: Kevin Krouse

    Created: Tue, 5 Oct 2004 11:25 AM
    Updated: Fri, 22 Oct 2004 7:42 PM

Description:
Compile the following trimmed down schema from  http://w3.org/TR/xqueryx/#Schema:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema targetNamespace="http://www.w3.org/2003/12/XQueryX"
      xmlns="http://www.w3.org/2003/12/XQueryX" 
      xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
      elementFormDefault="qualified" 
      attributeFormDefault="qualified">

  <!-- Kludge for anySimpleType -->
  <xsd:simpleType name="constantValueType">
    <xsd:union memberTypes="xsd:integer xsd:decimal xsd:string xsd:double"/>
  </xsd:simpleType>

  <!-- constant expressions. We have 4 different subclasses for this -->
  <xsd:complexType name="constantExpr">
        <xsd:sequence>
          <xsd:element name="value" type="constantValueType"/>
        </xsd:sequence>
  </xsd:complexType>

  <xsd:complexType name="integerConstantExpr">
    <xsd:complexContent>
      <xsd:restriction base="constantExpr">
        <xsd:sequence>
          <xsd:element name="value" type="xsd:integer"/>
        </xsd:sequence>
      </xsd:restriction>
    </xsd:complexContent>
  </xsd:complexType>

</xsd:schema>



results in:

Exception in thread "main" java.lang.NullPointerException
        at org.apache.xmlbeans.impl.schema.StscChecker.checkAllDerivationsForRestriction(StscChecker.java:1412)
                
        at org.apache.xmlbeans.impl.schema.StscChecker.typeDerivationOK(StscChecker.java:1394)
                
        at org.apache.xmlbeans.impl.schema.StscChecker.nameAndTypeOK(StscChecker.java:1337)
                
        at org.apache.xmlbeans.impl.schema.StscChecker.isParticleValidRestriction(StscChecker.java:404)
                
        at org.apache.xmlbeans.impl.schema.StscChecker.checkRestriction(StscChecker.java:364)
                
        at org.apache.xmlbeans.impl.schema.StscChecker.checkAll(StscChecker.java:63)
        at org.apache.xmlbeans.impl.schema.SchemaTypeSystemCompiler.compileImpl(SchemaTypeSystemCompiler.java:268)
                
        at org.apache.xmlbeans.impl.schema.SchemaTypeSystemCompiler.compile(SchemaTypeSystemCompiler.java:195)
                
        at org.apache.xmlbeans.impl.tool.SchemaCompiler.loadTypeSystem(SchemaCompiler.java:853)
                
        at org.apache.xmlbeans.impl.tool.SchemaCompiler.compile(SchemaCompiler.java:911)
                
        at org.apache.xmlbeans.impl.tool.SchemaCompiler.main(SchemaCompiler.java:330)



When checkAllDerivationsForRestriction() loops from the derived type down to the \
base, if the type is a union we continue following one of the types (that is \
assignable).  What is happening now is the derived type is never reaching the base \
type since the base type is one of the union members.


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