i'd be interested in learning more. is there some source going yet?
jon
Aleksei Valikov wrote:
> Hi.
>
>>> My point is that:
>>>
>>> - there are many other sources that can feed constraints into
>>> the object validator (say, RDBMS)
>>> - you often want to add more constraints into the object validator
>>> - the object validator can be used by many frameworks (JSF, for example)
>>
>>
>>
>> I'd like to find JAXB-specific solution first...
>
>
> If anyone's interested, I've started a small add-on that would produce
> "object verifiers".
>
> For instance let's take a complex type:
>
> <xs:complexType name="bookType">
> <xs:sequence>
> <xs:element name="name" type="xs:string"/>
> <xs:element name="ISBN" type="xs:long"/>
> <xs:element name="price" type="xs:string"/>
> <xs:element name="authors" >
> <xs:complexType>
> <xs:sequence>
> <xs:element name="authorName" type="xs:string" minOccurs="1"
> maxOccurs="unbounded"/>
> </xs:sequence>
> </xs:complexType>
> </xs:element>
> <xs:element name="description" type="xs:string" minOccurs="0"/>
> <xs:element name="promotion">
> <xs:complexType>
> <xs:choice>
> <xs:element name="Discount" type="xs:string" />
> <xs:element name="None" type="xs:string"/>
> </xs:choice>
> </xs:complexType>
> </xs:element>
> <!--xs:element name="publicationDate" type="xs:date"/-->
> <xs:element name="bookCategory">
> <xs:simpleType>
> <xs:restriction base="xs:NCName">
> <xs:enumeration value="magazine" />
> <xs:enumeration value="novel" />
> <xs:enumeration value="fiction" />
> <xs:enumeration value="other" />
> </xs:restriction>
> </xs:simpleType>
> </xs:element>
> </xs:sequence>
> <xs:attribute name="itemId" type="xs:string" />
> </xs:complexType>
>
> The add-on produces the code like:
>
> public void check(generated.BookType master) {
> if (null == master.getItemId()) {
> // Optional - nothing to report
> } else {
> // Check value
> }
> if (null == master.getName()) {
> // Optional - nothing to report
> } else {
> // Check value
> }
> // No check for primitive values
> if (null == master.getPrice()) {
> // Optional - nothing to report
> } else {
> // Check value
> }
> if (null == master.getAuthors()) {
> // Optional - nothing to report
> } else {
> // Check value
> }
> if (null == master.getDescription()) {
> // Optional - nothing to report
> } else {
> // Check value
> }
> if (null == master.getPromotion()) {
> // Optional - nothing to report
> } else {
> // Check value
> }
> if (null == master.getBookCategory()) {
> // Optional - nothing to report
> } else {
> // Check value
> }
> }
>
> ...
>
> public void check(generated.BookType.AuthorsType master) {
> if (null == master.getAuthorName()) {
> // Optional - nothing to report
> } else {
> // Check value
> }
> }
>
> or, for a choice:
>
> public static class PromotionTypeVerifier {
>
>
> public void report(generated.BookType.PromotionType master,
> java.lang.String field) {
> }
>
> public void check(generated.BookType.PromotionType master) {
> if ((null!= master.getDiscount())&&(!(null!=
> master.getNone()))) {
> // left exists
> if (null == master.getDiscount()) {
> // Optional - nothing to report
> } else {
> // Check value
> }
> } else {
> if ((!(null!= master.getDiscount()))&&(null!=
> master.getNone())) {
> // right exists
> if (null == master.getNone()) {
> // Optional - nothing to report
> } else {
> // Check value
> }
> } else {
> if ((!(null!= master.getDiscount()))&&(!(null!=
> master.getNone()))) {
> // todo: report both absent
> } else {
> // todo: report both present
> }
> }
> }
> }
> }
>
>
> "Check value" comment denotes a place to check field value - using
> datatype or other check methods.
>
> Such methods could perform quite thorough diagnostics of JAXB objects
> and provide detailed verification information.
>
> Bye.
> /lexi
>
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