Using XmlAdapter to generate desired xml format

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When desired XML format differs from Java object model, an XmlAdapter implementation can be used to transform model object into xml-format object and vice versa. This example demonstrates how to put a field’s value into an attribute of an element with field’s name.

public class XmlAdapterExample {

    @XmlAccessorType(XmlAccessType.FIELD)
    public static class NodeValueElement {
          
        @XmlAttribute(name="attrValue")
        String value;
    
        public NodeValueElement() {
        }
    
        public NodeValueElement(String value) {
            super();
            this.value = value;
        }
    
        public String getValue() {
            return value;
        }
    
        public void setValue(String value) {
            this.value = value;
        }
    }

    public static class ValueAsAttrXmlAdapter extends XmlAdapter<NodeValueElement, String> {        
        @Override
        public NodeValueElement marshal(String v) throws Exception {
            return new NodeValueElement(v);
        }
        
        @Override
        public String unmarshal(NodeValueElement v) throws Exception {
            if (v==null) return "";
            return v.getValue();
        }
    }

    @XmlRootElement(name="DataObject")
    @XmlAccessorType(XmlAccessType.FIELD)
    public static class DataObject {
        
        String elementWithValue;

        @XmlJavaTypeAdapter(value=ValueAsAttrXmlAdapter.class)
        String elementWithAttribute;
    }

    public static void main(String[] args) {
        DataObject data = new DataObject();
        data.elementWithValue="value1";
        data.elementWithAttribute ="value2";
        
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        JAXB.marshal(data, baos);

        String xmlString = new String(baos.toByteArray(), StandardCharsets.UTF_8);
        
        System.out.println(xmlString);
    }
}

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