6.6 Accessing the Address
When you run the sample main, complexContent_main, the output shows a zip code and a complete XML document. This document is created by unmarshaling the input file complexContent.xml, changing a piece of data, and then marshaling the result to the output.
The beginning of the sample application is just like the previous examples:
int main()
{
ipo::PurchaseOrder po;
try {
std::ifstream istrm("po.xml");
std::stringstream buffer;
buffer << istrm.rdbuf();
std::string xmlContents(buffer.str());
po.unmarshal(xmlContents.data());
} catch (const rwsf::XmlParseException &e) {
...
} catch (const rwsf::Exception &x) {
...
}
Next the sample application manipulates the billTo element, which as we know can be either a USAddress or a UKAddress. In the code below, the retrieval of the billTo address returns an rwsf::XmlBindingHandle, but we do not know its actual type. To find out, we call getTypeId() on the billTo object, which returns the value of the xsi:type attribute of the billTo element in the instance document. Based on this value, we can determine the actual type of billTo and produce the output appropriately.
rwsf::XmlBindingHandle billTo = po.getBillTo(); //1
// check address type. If UK address print post code;
// otherwise print zip code.
if (billTo.getTypeId() == "ipo::UKAddress") { //2
std::cout << "Post code = "
<< ((ipo::UKAddress&)billTo).getPostcode() << std::endl;
} else {
std::cout << "Zip code = "
<< ((ipo::USAddress&)billTo).getZip() << std::endl;
}
| //1 | Returns a rwsf::XmlBindingHandle which contains an Address, but whether a USAddress or a UKAddress is unknown. |
| //2 | Uses getTypeId() method to determine the actual type and creates appropriate output based on the result. |
Next the example code changes the shipTo address to be the same as the billTo address, and writes out the modified document.
po.setShipTo(po.getBillTo()); //1 rwsf::XmlStringWriter writer; //2 writer.setIgnoreWhitespace(false); po.marshal(writer); //3 std::cout << writer.getString().data() << std::endl; //4
| //1 | Sets the shipTo address to be the same as the billTo address. |
| //2 | Instantiates a writer and sets it to preserve whitespace. |
| //3 | Calls the marshal() method that marshals the data to a supplied writer. |
| //4 | Writes out the XML document. |
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