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Thread: is this a bug in JAXB or a problem of me?

  1. #1
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    Angry is this a bug in JAXB or a problem of me?

    Hi

    There is a problem that keeps puzzling me. I tried to google to find the reason and there is just none.
    Therefore, I am not sure if somebody might know.

    Say I have a schema like the following,

            <xs:element name="api">
              <xs:complexType>
                <xs:choice maxOccurs="unbounded">  <--------
                  <xs:element ref="a" minOccurs="1" />
                  <xs:element ref="b" minOccurs="1" />
                  <xs:element ref="c" minOccurs="1" />

    CASE1: When the line pointed by the arrow is like

            <xs:choice maxOccurs="unbounded">

    JAXB "xjc -p SomePackageName -d . ...." would generate a variable in Api.java such as

            protected List<Object> aOrBOrC;

    CASE2: However, if I change it to

            <xs:choice maxOccurs="1">

    JAXB generates

            protected A a;
            protected B b;
            protected C c;

    My question is in CASE1, how do I retrieve the value of A, B, and C individually since it is only given
    ONE variable although its a list of them. aOrBOrC can only be either a, b or c. What if my instance of
    the xml contains values for all a, b, and c.
    I would expect xjc to generate something like the following for CASE1.

            protected List<A> a;
            protected List<B> b;
            protected List<C> c;


  2. #2
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    Default Re: is this a bug in JAXB or a problem of me?

    I'm going to speculate and say: what does this produce:
    <xs:choice maxOccurs="1">
                  <xs:element ref="a" maxOccurs="unbounded" />
                  <xs:element ref="b" maxOccurs="unbounded" />
                  <xs:element ref="c" maxOccurs="unbounded" />
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  3. #3
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    Default Re: is this a bug in JAXB or a problem of me?

    This produce

     protected List<A> a;
     protected List<B> b;
     protected List<C> c;

    But as soon as
     <xs:choice maxOccurs="unbounded">
          <xs:element ref="a" maxOccurs="unbounded" />
          <xs:element ref="b" maxOccurs="unbounded" />
          <xs:element ref="c" maxOccurs="unbounded" />
     </xs:choice>

    it generates
    protected List<Object> aOrBOrC;

    I thought the <xs:choice maxOccurs="unbounded"> means I can have as many a b and c and in different order. Therefore, one variable aOrBOrC is not enough. Pls let me know what do I miss? Tx

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    Default Re: is this a bug in JAXB or a problem of me?

    I think I know how to retrieve the a, b, and c individually,

    It seems all the instances are stored in this one List<Object> aOrBOrC; and I simply
    need to loop through the list and use the instanceof to see if it belongs to a, b, or c .

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