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package com.sun.faces.application.applicationimpl;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import javax.faces.context.FacesContext;
import javax.xml.namespace.NamespaceContext;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.xml.sax.InputSource;
public class Version {
private Boolean isJsf23;
/**
* Are we running in JSF 2.3
*
* @return true if we are, false otherwise.
*/
public boolean isJsf23() {
if (isJsf23 == null) {
FacesContext facesContext = FacesContext.getCurrentInstance();
isJsf23 = getFacesConfigXmlVersion(facesContext).equals("2.3");
}
return isJsf23;
}
/**
* Get the faces-config.xml version (if any).
*
* @param facesContext the Faces context.
* @return the version found, or "" if none found.
*/
private String getFacesConfigXmlVersion(FacesContext facesContext) {
String result = "";
InputStream stream = null;
try {
URL url = facesContext.getExternalContext().getResource("/WEB-INF/faces-config.xml");
if (url != null) {
XPathFactory factory = XPathFactory.newInstance();
XPath xpath = factory.newXPath();
xpath.setNamespaceContext(new JavaeeNamespaceContext());
stream = url.openStream();
result = xpath.evaluate("string(/javaee:faces-config/@version)", new InputSource(stream));
}
} catch (MalformedURLException mue) {
// Ignore
} catch (XPathExpressionException | IOException xpee) {
} finally {
if (stream != null) {
try {
stream.close();
} catch (IOException ioe) {
// Ignore
}
}
}
return result;
}
public class JavaeeNamespaceContext implements NamespaceContext {
@Override
public String getNamespaceURI(String prefix) {
return "http://xmlns.jcp.org/xml/ns/javaee";
}
@Override
public String getPrefix(String namespaceURI) {
return "javaee";
}
@Override
public Iterator getPrefixes(String namespaceURI) {
return null;
}
}
}