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Difference between revisions of "EclipseLink/UserGuide/MOXy/Runtime/Querying Objects by XPath"
< EclipseLink | UserGuide | MOXy | Runtime
| Line 9: | Line 9: | ||
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, | + | For example, consider the following XML document: |
| − | <source lang=" | + | <source lang="xml"> |
| + | <?xml version="1.0" encoding="UTF-8"?> | ||
| + | <xsd:schema | ||
| + | xmlns:xsd="http://www.w3.org/2001/XMLSchema"> | ||
| + | |||
| + | <xsd:element name="customer"> | ||
| + | <xsd:complexType> | ||
| + | <xsd:sequence> | ||
| + | <xsd:element | ||
| + | name="date-of-birth" | ||
| + | type="xsd:date" | ||
| + | minOccurs="0"/> | ||
| + | </xsd:sequence> | ||
| + | </xsd:complexType> | ||
| + | </xsd:element> | ||
| + | |||
| + | </xsd:schema> | ||
| + | </source> | ||
| + | |||
| + | <source lang="java"> | ||
Customer customer = (Customer) jaxbContext.createUnmarshaller().unmarshal(instanceDoc); | Customer customer = (Customer) jaxbContext.createUnmarshaller().unmarshal(instanceDoc); | ||
| Line 23: | Line 42: | ||
You could use XPath to access these values: | You could use XPath to access these values: | ||
| − | <source lang=" | + | <source lang="java"> |
Customer customer = (Customer) jaxbContext.createUnmarshaller().unmarshal(instanceDoc); | Customer customer = (Customer) jaxbContext.createUnmarshaller().unmarshal(instanceDoc); | ||
Revision as of 14:19, 25 April 2011
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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:
<?xml version="1.0" encoding="UTF-8"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:element name="customer"> <xsd:complexType> <xsd:sequence> <xsd:element name="date-of-birth" type="xsd:date" minOccurs="0"/> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:schema>
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);
