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[eclipselink-users] [MOXy] mapping inheritance of schema types
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Hi,
My schema defines the following inheritance:
<xsd:complexType name="RootType" abstract="true">
<xsd:sequence>
<xsd:element ref="field1" minOccurs="0"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="BranchType" abstract="true">
<xsd:complexContent>
<xsd:extension base="RootType">
<xsd:sequence>
<xsd:element ref="field2" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="LeafType">
<xsd:complexContent>
<xsd:extension base="BranchType">
<xsd:element ref="field3" maxOccurs="unbounded"/>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
The Java classes also mirror this inheritance tree:
public class Root {
private String field1;
}
public class Branch extends Root {
private String field2;
}
public class Leaf extends Branch {
private String field3;
}
Actually, Root and Branch ought to be abstract classes, but EclipseLink
threw instantiation exceptions complaining about missing no-arg constructor
until I took out the "abstract".
I expect to parse XML that looks like this into the Leaf object:
<Leaf>
<field1>...</field1>
<field2>...</field2>
<field3>...</field3>
</Leaf>
I don't want to redundantly map the fields from Branch and Root in Leaf, so
I am trying to map each of those classes to its corresponding type in the
schema. In the Workbench, I have these settings:
1. Leaf has a mapping for field3, the class is marked as a child
descriptor, and its parent is Branch.
2. Branch has a mapping for field2, the class is marked as a child
descriptor, and its parent is Root.
3. Root has a mapping for field1, the class is marked as a parent, and
then... I'm stuck.
The problem is:
* I cannot use the Class Extraction Method, because it looks like this hook
is never called for XML projects.
* I cannot use the Class Indicator Field's "xml schema type attribute",
because I assume this means that I need an an attribute like
"xsi:type='Leaf'", and my schema does not allow this attribute.
* I cannot use the Class Indicator Field's "specify field" setting because
there's no element inside the <Leaf></Leaf> tags that will tell me what
class to use.
So I am perplexed. How come EclipseLink can't tell that it should use the
Leaf class if the xml element name is "Leaf"? I have already set the
"Schema Context" to "Leaf". Why does EclipseLink need something else to
tell it what type to use?
Is there a better way to specify inheritance in XML mappings without having
to use the Map Inherited Attributes -> To Root Minus One option? That would
force me to remap the same attributes over and over again and be a pain if
the root definition ever changes.
Thanks for your help,
Polly
--
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