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 /*
  * Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
  * 
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  * 
  * http://www.apache.org/licenses/LICENSE-2.0
  * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package freemarker.ext.jsp;
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;
Don't use this class; it's only public to work around Google App Engine Java compliance issues. FreeMarker developers only: treat this class as package-visible. Implementation of PageContext that contains JSP 2.0 specific methods.
    private static final Logger LOG = Logger.getLogger("freemarker.jsp");
    static {
        if(JspFactory.getDefaultFactory() == null) {
            JspFactory.setDefaultFactory(new FreeMarkerJspFactory2());
        }
        .debug("Using JspFactory implementation class " + 
                JspFactory.getDefaultFactory().getClass().getName());
    }
        super();
    }

    
Attempts to locate and manufacture an expression evaulator instance. For this to work you must 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 namethrows ELException {
                return ctx.findAttribute(name);
            }
        };
    }

    
Includes the specified path. The flush argument is ignored!
    public void include(String pathboolean flushthrows IOException, ServletException {
        super.include(path);
    }
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