package freemarker.ext.jsp;
import freemarker.log.Logger;
import freemarker.template.TemplateModelException;
import javax.servlet.jsp.el.ExpressionEvaluator;
import javax.servlet.jsp.el.VariableResolver;
import javax.servlet.jsp.el.ELException;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.PageContext;
import javax.servlet.ServletException;
import java.io.IOException;
/**
* Implementation of PageContext that contains JSP 2.0 specific methods.
*
* @author Attila Szegedi
* @version $Id: FreeMarkerPageContext2.java,v 1.1.2.1 2006/07/08 14:45:34 ddekany Exp $
*/
class FreeMarkerPageContext2 extends FreeMarkerPageContext {
private static final Logger logger = Logger.getLogger("freemarker.jsp");
static {
if(JspFactory.getDefaultFactory() == null) {
JspFactory.setDefaultFactory(new FreeMarkerJspFactory2());
}
logger.debug("Using JspFactory implementation class " +
JspFactory.getDefaultFactory().getClass().getName());
}
private FreeMarkerPageContext2() throws TemplateModelException {
super();
}
static FreeMarkerPageContext create() throws TemplateModelException {
return new FreeMarkerPageContext2();
}
/**
* Attempts to locate and manufacture an expression evaulator instance. For this
* to work you <b>must</b> have the Apache Commons-EL package in the classpath. If
* Commons-EL is not available, this method will throw an UnsupportedOperationException.
*/
public ExpressionEvaluator getExpressionEvaluator() {
try {
Class type = Thread.currentThread().getContextClassLoader().loadClass
("org.apache.commons.el.ExpressionEvaluatorImpl");
return (ExpressionEvaluator) type.newInstance();
}
catch (Exception e) {
throw new UnsupportedOperationException("In order for the getExpressionEvaluator() " +
"method to work, you must have downloaded the apache commons-el jar and " +
"made it available in the classpath.");
}
}
/**
* Returns a variable resolver that will resolve variables by searching through
* the page scope, request scope, session scope and application scope for an
* attribute with a matching name.
*/
public VariableResolver getVariableResolver() {
final PageContext ctx = this;
return new VariableResolver() {
public Object resolveVariable(String name) throws ELException {
return ctx.findAttribute(name);
}
};
}
/**
* Includes the specified path. The flush argument is ignored!
*/
public void include(String path, boolean flush) throws IOException, ServletException {
super.include(path);
}
}