Writing an SXC parser is fairly simple. You tell SXC what type of XML you are expecting and then attach actions to it. Lets look at a simple example. We have a Customer object with two properties "id" and "name". We want to map this XML to it:
<customer id="1"> <name>Dan Diephouse</name> </customer>
Here is an example of the parser that we would create:
// Create a Parser/Writer Builder Builder builder = new BuilderImpl(); ElementParserBuilder b = builder.getParserBuilder(); // Get the CodeModel - an API for building Java classes JCodeModel model = builder.getCodeModel(); JType cusClass = model._ref(Customer.class); // Tell SXC to expect a <customer> element ElementParserBuilder root = b.expectElement(new QName("customer")); // When we see <customer> create a new Customer object CodeBody body = root.getBody(); JVar var = body.decl(cusClass, "customer", JExpr._new(model._ref(Customer.class))); // Return the customer object once we're done parsing body._return(var); // Tell SXC to expect an attribute "id" on the <customer> element ParserBuilder idBuilder = root.expectAttribute(new QName("id")); // Pass the customer object to the ParserBuilder that handles the ID JVar methodVar = idBuilder.passParentVariable(var); // Read the attribute as a int. JVar attVar = idBuilder.as(int.class); // pass this variable to setId on the customer object idBuilder.getBody().add(methodVar.invoke("setId").arg(attVar)); // Handle the <name> element ElementParserBuilder nameBuilder = root.expectElement(new QName("name")); // Pass the Customer object to this builder methodVar = nameBuilder.passParentVariable(var); // Read the element as a non nillable String JVar name = nameBuilder.as(String.class, false); // Call setName with this String as an argument nameBuilder.getBody().add(methodVar.invoke("setName").arg(name)); // Compile the written classes Context context = builder.compile(); // unmarshal the xml Reader reader = context.createReader(); Object object = reader.read(getClass().getResourceAsStream("customer.xml")); assertTrue(object instanceof Customer); Customer c = (Customer) object; assertEquals(1, c.getId()); assertEquals("Dan Diephouse", c.getName());
