package com.theoryinpractise.halbuilder.xml;
import com.theoryinpractise.halbuilder.api.*;
import com.theoryinpractise.halbuilder.impl.representations.MutableRepresentation;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.Namespace;
import org.jdom.input.SAXBuilder;
import java.io.IOException;
import java.io.Reader;
import java.util.List;
import static com.theoryinpractise.halbuilder.impl.api.Support.*;
public class XmlRepresentationReader implements RepresentationReader {
private RepresentationFactory representationFactory;
public XmlRepresentationReader(RepresentationFactory representationFactory) {
this.representationFactory = representationFactory;
}
public ReadableRepresentation read(Reader reader) {
try {
Document d = new SAXBuilder().build(reader);
Element root = d.getRootElement();
return readRepresentation(root).toImmutableResource();
} catch (JDOMException e) {
throw new RepresentationException(e);
} catch (IOException e) {
throw new RepresentationException(e);
}
}
private MutableRepresentation readRepresentation(Element root) {
String href = root.getAttributeValue("href");
MutableRepresentation resource = new MutableRepresentation(representationFactory, href);
readNamespaces(resource, root);
readLinks(resource, root);
readProperties(resource, root);
readResources(resource, root);
return resource;
}
private void readNamespaces(Representation resource, Element element) {
List<Namespace> namespaces = element.getAdditionalNamespaces();
for (Namespace ns : namespaces) {
if (!"xsi".equals(ns.getPrefix())) {
resource.withNamespace(ns.getPrefix(), ns.getURI());
}
}
}
private void readLinks(Representation resource, Element element) {
List<Element> links = element.getChildren("link");
for (Element link : links) {
String rel = link.getAttributeValue(REL);
String href = link.getAttributeValue(HREF);
String name = link.getAttributeValue(NAME);
String title = link.getAttributeValue(TITLE);
String hreflang = link.getAttributeValue(HREFLANG);
String profile = link.getAttributeValue(PROFILE);
resource.withLink(rel, href, name, title, hreflang, profile);
}
}
private void readProperties(Representation resource, Element element) {
List<Element> properties = element.getChildren();
for (Element property : properties) {
if (!property.getName().matches("(link|resource)")) {
if (property.getAttribute("nil", XSI_NAMESPACE) != null) {
resource.withProperty(property.getName(), null);
} else {
resource.withProperty(property.getName(), property.getValue());
}
}
}
}
private void readResources(Representation halResource, Element element) {
List<Element> resources = element.getChildren("resource");
for (Element resource : resources) {
String rel = resource.getAttributeValue("rel");
Representation subResource = readRepresentation(resource);
halResource.withRepresentation(rel, subResource);
}
}
}