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Difference between revisions of "EclipseLink/UserGuide/MOXy/Runtime/Querying Objects by XPath"
< EclipseLink | UserGuide | MOXy | Runtime
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For example, consider the following XML document: | For example, consider the following XML document: | ||
| − | <div style="width: | + | <div style="width:750px"> |
<source lang="xml"> | <source lang="xml"> | ||
<customer id="1141"> | <customer id="1141"> | ||
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Your typical application code might look something like this: | Your typical application code might look something like this: | ||
| − | <div style="width: | + | <div style="width:750px"> |
<source lang="java"> | <source lang="java"> | ||
Customer customer = (Customer) jaxbContext.createUnmarshaller().unmarshal(instanceDoc); | Customer customer = (Customer) jaxbContext.createUnmarshaller().unmarshal(instanceDoc); | ||
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You could instead use XPath to access these values: | You could instead use XPath to access these values: | ||
| − | <div style="width: | + | <div style="width:750px"> |
<source lang="java"> | <source lang="java"> | ||
Customer customer = (Customer) jaxbContext.createUnmarshaller().unmarshal(instanceDoc); | Customer customer = (Customer) jaxbContext.createUnmarshaller().unmarshal(instanceDoc); | ||
Revision as of 13:12, 11 July 2011
EclipseLink MOXy
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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);
