Java – unmarshalling partial XML in XML schema


public class XmlPartialMarshaller<T> {
    private static final Logger LOGGER = LoggerFactory.getLogger(XmlPartialMarshaller.class);
    private DocumentBuilder documentBuilder;
    private DocumentBuilderFactory documentBuilderFactory;
    private Binder<Node> binderPartialXml;
    private JAXBContext contextPartialXml;

    private Class partialSchemaClass;

    public XmlPartialMarshaller(Class<T> partialSchemaClass) {
        this.partialSchemaClass = partialSchemaClass;

        try {
            this.documentBuilderFactory = DocumentBuilderFactory.newInstance();
            this.documentBuilder = documentBuilderFactory.newDocumentBuilder();

            this.contextPartialXml = JAXBContext.newInstance(partialSchemaClass);
            this.binderPartialXml = contextPartialXml.createBinder();
        } catch (Exception e) {
            LOGGER.error(e.getMessage(), e);
        }
    }

    public T marshalPartialXml(String xml) {
       try {
            InputStream inputStream = null;
            try {
                inputStream = IOUtils.toInputStream(xml);
                Document document = documentBuilder.parse(inputStream);
                Node xmlNode = document.getDocumentElement();
                JAXBElement<T> element = binderPartialXml.unmarshal(xmlNode,
                        partialSchemaClass);

                return element.getValue();
            } catch (Exception e) {
                LOGGER.error(e.getMessage(), e);
            } finally {
                if (inputStream != null)
                    inputStream.close();
            }
        } catch (Exception e) {
            LOGGER.error(e.getMessage(), e);
        }

        return null;
    }
}
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