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

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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.
 
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:
 
For example, consider the following XML document:
Line 21: Line 22:
 
</customer>
 
</customer>
 
</source>
 
</source>
 +
  
 
Your typical application code might look something like this:
 
Your typical application code might look something like this:
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jaxbContext.createMarshaller().marshal(customer, System.out);
 
jaxbContext.createMarshaller().marshal(customer, System.out);
 
</source>
 
</source>
 +
  
 
You could instead use XPath to access these values:
 
You could instead use XPath to access these values:

Revision as of 13:28, 25 April 2011

EclipseLink MOXy

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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);


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