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Difference between revisions of "EclipseLink/UserGuide/MOXy/Runtime/Binding to an Existing Document"

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|api=* [http://www.eclipse.org/eclipselink/api/latest/javax/xml/bind/Binder.html|javax.xml.bind.Binder]
|apis=* [http://www.eclipse.org/eclipselink/api/latest/javax/xml/bind/Binder.html|javax.xml.bind.Binder]

Revision as of 10:24, 15 December 2010

Binding to an Existing XML Document

The JAXB Binder interface (introduced in JAXB 2.0) allows you to preserve an entire XML document, even if only some of the items are mapped.

Normally, when using a Unmarshaller to load the XML document into objects and a Marshaller to save the objects back to XML, the unmapped content is lost.

The Binder is created from the JAXBContext and interacts with XML in the form of a DOM. The Binder maintains an association between the Java objects and their corresponding DOM nodes.

import java.io.File;
import javax.xml.bind.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.*;
public class BinderDemo {
    public static void main(String[] args) throws Exception {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        File xml = new File("input.xml");
        Document document = db.parse(xml);
        JAXBContext jc = JAXBContext.newInstance(Customer.class);
        Binder<Node> binder = jc.createBinder();
        Customer customer = (Customer) binder.unmarshal(document);
        customer.getAddress().setStreet("2 NEW STREET");
        PhoneNumber workPhone = new PhoneNumber();
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer t = tf.newTransformer();
        t.transform(new DOMSource(document), new StreamResult(System.out));

The Binder applies the changes to the original DOM instead of creating a new XML document, thereby preserving the entire XML infoset.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <name>Jane Doe</name>
    <!-- COMMENT #1 -->
        <street>2 NEW STREET</street>
        <!-- COMMENT #2 -->
        <city>Any Town</city>
    <!-- COMMENT #3 -->
    <phone-number type="home">555-HOME</phone-number>
    <!-- COMMENT #4 -->
    <phone-number type="cell">555-CELL</phone-number>
    <phone-number type="work">555-WORK</phone-number>
    <!-- COMMENT #5 -->

Version: 2.2.0 Draft
Other versions...