Re: [castor-dev] How do I define an array collection for JDO?

[Martin, Margaret]

Neil,
You'll need to add additional setters/getters that utilize either another
collection type for the collection (ArrayList or Vector). Then change the
mapping to something like:

        <class name="com.novobase.castor.Atoms" identity="id"
depends="com.novobase.castor.Minimol" key-generator="MAX">
        <description>Atoms</description>
                <map-to table="atoms"/>
    
                <field name="id">
                        <sql name="id"/>
                </field>
                
                <field name="atom" type="com.novobase.castor.Atom"
collection="ArrayList" set-method="getAtomsList" get-method="getAtomsList">
                        <sql many-key="parentId"/>
                </field>
        </class>

HTH -
Margaret

-----Original Message-----
From: Neil Blue [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, November 19, 2002 4:16 AM
To: [EMAIL PROTECTED]
Subject: [castor-dev] How do I define an array collection for JDO?


Hello,

I am using Castor to unmarshall and store XML files. I have managed this for
a subset of elements from my schema so far. However I have come across a
problem trying to store collections of objects. 

Here is an extract from my schema:

<xs:complexType name="atomsType">
        <xs:sequence>
                <xs:element name="atom" type="atomType"
maxOccurs="unbounded"/>
        </xs:sequence>
        <xs:attribute name="id" type="xs:integer"/>
</xs:complexType>

This creates an 'AtomsType' class with 'Atom[] getAtom()' and
'setAtom(Atom[])' methods. 

This works fine till I try to store this array. Here is my mapping.xml
entry:

        <class name="com.novobase.castor.Atoms" identity="id"
depends="com.novobase.castor.Minimol" key-generator="MAX">
        <description>Atoms</description>
                <map-to table="atoms"/>
    
                <field name="id">
                        <sql name="id"/>
                </field>
                
                <field name="atom" type="com.novobase.castor.Atom"
collection="array">
                        <sql many-key="parentId"/>
                </field>
        </class>

But the error I get when I go to store the object is:

    [junit] Testcase: testJDO took 1.035 sec
    [junit]     Caused an ERROR
    [junit] The return type for method public com.novobase.castor.Atom[]
com.novobase.castor.AtomsType.getAtom() does not match the declared field
type [Ljava.lang.Object;
    [junit] org.exolab.castor.mapping.MappingException: The return type for
method public com.novobase.castor.Atom[]
com.novobase.castor.AtomsType.getAtom() does not match the declared field
type [Ljava.lang.Object;
    [junit]     at
org.exolab.castor.persist.FieldMolder.findAccessor(Unknown Source)

Please could anyone tell me if my mapping is wrong or if there is a better
way to do this.

Thank you
Neil 

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