Jump to: navigation, search

Difference between revisions of "EclipseLink/UserGuide/MOXy/Runtime/Querying Objects by XPath"

Line 3: Line 3:
 
|eclipselink=y
 
|eclipselink=y
 
|eclipselinktype=MOXy
 
|eclipselinktype=MOXy
 +
|api=y
 +
|apis= * [http://www.eclipse.org/eclipselink/api/latest/org/eclipse/persistence/jaxb/JAXBContext.html JAXBContext]
 
}}
 
}}
  

Revision as of 14:39, 25 April 2011

EclipseLink MOXy

link="http://wiki.eclipse.org/EclipseLink"
EclipseLink
Website
Download
Community
Mailing ListForumsIRC
Bugzilla
Open
Help Wanted
Bug Day
Contribute
Browse Source

Elug api package icon.png Key API


Querying Objects by XPath

In addition to using conventional Java access methods to get and set your object's values, EclipseLink MOXy also allows you to access values using an XPath statement. There are special APIs on EclipseLink's JAXBContext to allow you to get and set values by XPath.


For example, consider the following XML document:

<customer id="1141">
   <first-name>Jon</first-name>
   <last-name>Smith</last-name>
   <phone-number>
      <area-code>515</area-code>
      <number>2726652</number>
   </phone-number>
</customer>


Your typical application code might look something like this:

Customer customer = (Customer) jaxbContext.createUnmarshaller().unmarshal(instanceDoc);
...
int customerId = customer.getId();
customer.setFirstName("Bob");
customer.getPhoneNumber().setAreaCode("555");
...
jaxbContext.createMarshaller().marshal(customer, System.out);


You could instead use XPath to access these values:

Customer customer = (Customer) jaxbContext.createUnmarshaller().unmarshal(instanceDoc);
...
int customerId = jaxbContext.getValueByXPath(customer, "@id", null, Integer.class);
jaxbContext.setValueByXPath(customer, "first-name/text()", null, "Bob");
jaxbContext.setValueByXPath(customer, "phone-number/area-code/text()", null, "555");
...
jaxbContext.createMarshaller().marshal(customer, System.out);


Eclipselink-logo.gif
Version: 2.2.0 - DRAFT
Other versions...