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

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== Querying Objects by XPath ==
 
== Querying Objects by XPath ==
  
With EclipseLink MOXy, you do not have to use normal Javabean access methods to '''get''' and '''set''' values. Instead, you can use the APIs on the JAXBContext itself, at runtime.
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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.
  
 
For example, instead of:
 
For example, instead of:

Revision as of 14:16, 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, instead of:

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 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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