Re: [Simple-support] How to parse an xml element with a provided default value from xsd?

[Niall G. <gal...@ya...>]

This is really a question for the underlying parser, Simple uses StAX, DOM, or KXML depending on the platform you are on. Simple does not deal directly with parsing.
 

________________________________
From: Alexander Poulikakos <ale...@er...>
To: "sim...@li..." <sim...@li...> 
Sent: Friday, 13 January 2012 8:27 AM
Subject: [Simple-support] How to parse an xml element with a provided default value from xsd?


Hi
 
I have an xml-schema (my.xsd) and an xml document (my.xml), as shown below. I have made two classes (Element.java and Elements.java also shown below) to parse the xml-document.

When doing the following, everything works as expected:
==========================================
        publicstaticvoidmain(String[] args) throwsThrowable {
            Serializer serializer = newPersister();
            Elements elements = serializer.read(Elements.class, newFile("my.xml"));
            Element element = elements.getElementByName("propB");
            System.out.println(element.getValue());
        }
==========================================
 
And “BBB” is printed on the console. However, if I remove the following from my.xml file “value="BBB"” and run the same code I would expect the default value (as defined in my.xsd) to be returned. But instead I get “null”. What am I doing wrong? How do I return the default value (“CCC” in this case)? 
 
I’m quite new to XML, so it is possible that I have missed the concept of xml-schemas…
 
Regards,
Alex
 
my.xml
==========================================
<?xmlversion="1.0"encoding="UTF-8"?>
<elements
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:noNamespaceSchemaLocation="my.xsd">
 
        <elementname="propA"value="AAA"/>
        <elementname="propB"value="BBB"/>
</elements>
==========================================

my.xsd
==========================================
<?xmlversion="1.0"?>
<xs:schemaxmlns:xs="http://www.w3.org/2001/XMLSchema">
 
<xs:complexTypename="elementType">
  <xs:attribute name="name" type="xs:string" use="required" />
  <xs:attribute name="value" type="xs:string"  default="CCC" />
</xs:complexType>
 
<xs:elementname="elements">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="element" type="elementType" maxOccurs="unbounded"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>
 
</xs:schema>
==========================================
 
 
Elements.java
==========================================
packagesimple;
 
importorg.simpleframework.xml.Attribute;
importorg.simpleframework.xml.ElementList;
importorg.simpleframework.xml.Root;
importorg.simpleframework.xml.util.Dictionary;
 
@Root(name="elements")
publicclassElements {
        @Attribute(name="noNamespaceSchemaLocation") privateString noNamespaceSchemaLocation;
 
        @ElementList(entry = "element", inline = true) 
        privateDictionary<Element> elements= newDictionary<Element>();
 
        publicElements(@ElementList(entry = "element", inline = true) Dictionary<Element> resources) {
                this.elements= resources;
        }
 
        publicElement getElementByName(String name){
                returnelements.get(name);
        }
}
==========================================
 
Element.java
packagesimple;
 
importorg.simpleframework.xml.Attribute;
importorg.simpleframework.xml.Root;
importorg.simpleframework.xml.util.Entry;
 
@Root
publicclassElement implementsEntry{
    @Attribute(name="name") private String name;
    @Attribute(name="value", required=false) private String value;
 
    public Element(@Attribute(name="name") String name, @Attribute(name="value", required=false) String value) {
        this.name = name;
        this.value = value;
    }
 
    public String getName() {
        return name;
    }
 
    public String getValue() {
        return value;
    }
}
==========================================
 
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