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XmlResourceReader.java
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XmlResourceReader.java
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package com.theoryinpractise.halbuilder.impl.xml;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import com.theoryinpractise.halbuilder.ResourceFactory;
import com.theoryinpractise.halbuilder.impl.api.ResourceReader;
import com.theoryinpractise.halbuilder.impl.resources.MutableResource;
import com.theoryinpractise.halbuilder.spi.ReadableResource;
import com.theoryinpractise.halbuilder.spi.Resource;
import com.theoryinpractise.halbuilder.spi.ResourceException;
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.HREFLANG;
import static com.theoryinpractise.halbuilder.impl.api.Support.NAME;
import static com.theoryinpractise.halbuilder.impl.api.Support.TITLE;
import static com.theoryinpractise.halbuilder.impl.api.Support.XSI_NAMESPACE;
public class XmlResourceReader implements ResourceReader {
private ResourceFactory resourceFactory;
public XmlResourceReader(ResourceFactory resourceFactory) {
this.resourceFactory = resourceFactory;
}
public ReadableResource read(Reader reader) {
try {
Document d = new SAXBuilder().build(reader);
Element root = d.getRootElement();
return readResource(root).toImmutableResource();
} catch (JDOMException e) {
throw new ResourceException(e);
} catch (IOException e) {
throw new ResourceException(e);
}
}
private MutableResource readResource(Element root) {
String href = root.getAttributeValue("href");
MutableResource resource = new MutableResource(resourceFactory, href);
readNamespaces(resource, root);
readLinks(resource, root);
readProperties(resource, root);
readResources(resource, root);
return resource;
}
private void readNamespaces(Resource resource, Element element) {
List<Namespace> namespaces = element.getAdditionalNamespaces();
for (Namespace ns : namespaces) {
resource.withNamespace(ns.getPrefix(), ns.getURI());
}
}
private void readLinks(Resource resource, Element element) {
List<Element> links = element.getChildren("link");
for (Element link : links) {
String rel = link.getAttributeValue("rel");
String href = link.getAttributeValue("href");
Optional<String> name = optionalElementValueAsText(link, NAME);
Optional<String> title = optionalElementValueAsText(link, TITLE);
Optional<String> hreflang = optionalElementValueAsText(link, HREFLANG);
Optional<Predicate<ReadableResource>> predicate = Optional.<Predicate<ReadableResource>>absent();
resource.withLink(href, rel, predicate, name, title, hreflang);
}
}
Optional<String> optionalElementValueAsText(Element node, String key) {
String value = node.getAttributeValue(key);
return value != null ? Optional.of(value) : Optional.<String>absent();
}
private void readProperties(Resource 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(Resource halResource, Element element) {
List<Element> resources = element.getChildren("resource");
for (Element resource : resources) {
String rel = resource.getAttributeValue("rel");
Resource subResource = readResource(resource);
halResource.withSubresource(rel, subResource);
}
}
}