com.google.code.facebookapi.FacebookNamespaceContext Maven / Gradle / Ivy
package com.google.code.facebookapi;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.xml.namespace.NamespaceContext;
/**
* This NamespaceContext provides the namespaces used by Facebook.
*
* Use xpath.setNamespaceContext(new FacebookNamespaceContext()) on your
* javax.xml.xpath.XPath object so that you can evaluate XPath expressions using
* prefixes like:
*
* xpath.evaluate("fbapi:fql_query_response", document);
*
* @author david.j.boden
*/
public class FacebookNamespaceContext implements NamespaceContext {
private static final int NUMBER_OF_NAMESPACES_HINT = 2;
private static Map prefixToNamespace = new HashMap(
NUMBER_OF_NAMESPACES_HINT);
private static Map namespaceToPrefix = new HashMap(
NUMBER_OF_NAMESPACES_HINT);
static {
add("fb", "http://apps.facebook.com/ns/1.0");
add("fbapi", "http://api.facebook.com/1.0/");
}
private static void add(String prefix, String namespace) {
prefixToNamespace.put(prefix, namespace);
namespaceToPrefix.put(namespace, prefix);
}
public String getNamespaceURI(String prefix) {
return prefixToNamespace.get(prefix);
}
public String getPrefix(String namespaceURI) {
return namespaceToPrefix.get(namespaceURI);
}
public Iterator getPrefixes(String namespaceURI) {
return Collections.singletonList(namespaceToPrefix.get(namespaceURI))
.iterator();
}
}