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<div class="ind"><!-- End Header --><a id="CACECFJJ" name="CACECFJJ"></a><a id="TLJAX183" name="TLJAX183"></a>
<div class="sect1"><!-- infolevel="all" infotype="General" -->
<h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Binding to an Existing Document</font></h1>
<p>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.</p>
<p>Normally, when using an Unmarshaller to load the XML document into objects, and a Marshaller to save the objects back to XML, the unmapped content will be lost.</p>
<p>A Binder can be created from the JAXBContext to interact with the XML in the form of a DOM. The Binder maintains an association between the Java objects and their corresponding DOM nodes.</p>
<div class="example"><a id="TLJAX184" name="TLJAX184"></a><a id="sthref55" name="sthref55"></a>
<p><strong><em><font face="arial, helvetica, sans-serif">Example 2-31 Using a Binder</font></em></strong></p>
<pre xml:space="preserve" class="oac_no_warn">
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&lt;Node&gt; binder = jc.createBinder();
Customer customer = (Customer) binder.unmarshal(document);
customer.getAddress().setStreet("2 NEW STREET");
PhoneNumber workPhone = new PhoneNumber();
workPhone.setType("work");
workPhone.setValue("555-WORK");
customer.getPhoneNumbers().add(workPhone);
binder.updateXML(customer);
TransformerFactory tf = TransformerFactory.newInstance();
Transformer t = tf.newTransformer();
t.transform(new DOMSource(document), new StreamResult(System.out));
}
}
</pre></div>
<!-- class="example" -->
<p>The Binder applies the changes to the original DOM instead of creating a new XML document, thereby preserving the entire XML infoset.</p>
<pre xml:space="preserve" class="oac_no_warn">
&lt;?xml version="1.0" encoding="UTF-8" standalone="no"?&gt;
&lt;customer&gt;
&lt;UNMAPPED_ELEMENT_1/&gt;
&lt;name&gt;Jane Doe&lt;/name&gt;
&lt;!-- COMMENT #1 --&gt;
&lt;address&gt;
&lt;UNMAPPED_ELEMENT_2/&gt;
&lt;street&gt;2 NEW STREET&lt;/street&gt;
&lt;!-- COMMENT #2 --&gt;
&lt;UNMAPPED_ELEMENT_3/&gt;
&lt;city&gt;Any Town&lt;/city&gt;
&lt;/address&gt;
&lt;!-- COMMENT #3 --&gt;
&lt;UNMAPPED_ELEMENT_4/&gt;
&lt;phone-number type="home"&gt;555-HOME&lt;/phone-number&gt;
&lt;!-- COMMENT #4 --&gt;
&lt;phone-number type="cell"&gt;555-CELL&lt;/phone-number&gt;
&lt;phone-number type="work"&gt;555-WORK&lt;/phone-number&gt;
&lt;UNMAPPED_ELEMENT_5/&gt;
&lt;!-- COMMENT #5 --&gt;
&lt;/customer&gt;
</pre></div>
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