OpenIDのxrds文書処理クラスXrdsDocumentBuilder.java

2015年12月30日

Javaコード：

import java.io.IOException;
import java.io.StringWriter;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.Namespace;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

/**
* @author J Steven Perry
* @author Makoto Consulting Group, Inc.
* @author Oscar Pearce – many thanks to Oscar for the guts of the code
* you see below to build the proper XRDS response document.
*
*/
public class XrdsDocumentBuilder {

private static final Logger log = Logger.getLogger(XrdsDocumentBuilder.class);

private Element baseElement;

private static final String MASTER_XRDS_NAMESPACE = “xri://$xrd*($v*2.0)";

public XrdsDocumentBuilder() {
Namespace xrdNS = Namespace.getNamespace(MASTER_XRDS_NAMESPACE);
baseElement = new Element(“XRD", xrdNS);
}

public void addServiceElement(String type, String uri, String priority) {
addServiceElement(type, uri, priority, null);
}

private void addServiceElement(String type, String uri, String priority, String delegate) {
log.trace(“addServiceElement() BEGIN…");
log.debug(“Creating service element of type '" + type + “' for uri '" + uri + “' of priority '" + priority + “' with delegate '" + delegate + “'");
Namespace xrdNS = Namespace.getNamespace(MASTER_XRDS_NAMESPACE);
Namespace openidNS = Namespace.getNamespace(“openid", “http://openid.net/xmlns/1.0");
Element serviceElement = new Element(“Service", xrdNS);
Element typeElement = new Element(“Type", xrdNS);
typeElement.addContent(type);
Element uriElement = new Element(“URI", xrdNS);
uriElement.addContent(uri);
serviceElement.addContent(typeElement);
serviceElement.addContent(uriElement);
if (StringUtils.isNotEmpty(delegate)) {
Element delegateElement = new Element(“Delegate", openidNS);
delegateElement.addContent(delegate);
serviceElement.addContent(delegateElement);
}
if (StringUtils.isNotEmpty(priority)) {
serviceElement.setAttribute(“priority", priority);
}
baseElement.addContent(serviceElement);
log.trace(“addServiceElement() END…");
}

public String toXmlString() {
log.trace(“toXmlString() BEGIN…");
Namespace xrdsNS = Namespace.getNamespace(“xrds", “xri://$xrds");
Element rootElement = new Element(“XRDS", xrdsNS);
rootElement.addContent(baseElement);
Document doc = new Document(rootElement);
StringWriter w = new StringWriter();
XMLOutputter o = new XMLOutputter(Format.getPrettyFormat());
try {
o.output(doc, w);
w.close();
}
catch(IOException e) {
log.warn(“Caught an IOException while writing to StringWriter! This can’t be happening!", e);
}
log.debug(“XRD Response = " + w.toString());
log.trace(“toXmlString() END…");
return w.toString();
}

}