| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 java.security.AccessController; |
| import java.security.PrivilegedAction; |
| |
| import javax.el.ELContext; |
| import javax.servlet.jsp.JspApplicationContext; |
| import javax.servlet.jsp.JspContext; |
| import javax.servlet.jsp.JspFactory; |
| import javax.servlet.jsp.PageContext; |
| import javax.servlet.jsp.el.ELException; |
| import javax.servlet.jsp.el.ExpressionEvaluator; |
| import javax.servlet.jsp.el.VariableResolver; |
| |
| import freemarker.log.Logger; |
| import freemarker.template.TemplateModelException; |
| import freemarker.template.utility.ClassUtil; |
| |
| /** |
| * 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 and JSP 2.1 specific |
| * methods. |
| */ |
| public class _FreeMarkerPageContext21 extends FreeMarkerPageContext { |
| private static final Logger LOG = Logger.getLogger("freemarker.jsp"); |
| |
| static { |
| if (JspFactory.getDefaultFactory() == null) { |
| JspFactory.setDefaultFactory(new FreeMarkerJspFactory21()); |
| } |
| LOG.debug("Using JspFactory implementation class " + |
| JspFactory.getDefaultFactory().getClass().getName()); |
| } |
| |
| public _FreeMarkerPageContext21() throws TemplateModelException { |
| super(); |
| } |
| |
| /** |
| * 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. |
| */ |
| @Override |
| public ExpressionEvaluator getExpressionEvaluator() { |
| try { |
| Class type = ((ClassLoader) AccessController.doPrivileged( |
| new PrivilegedAction() { |
| @Override |
| public Object run() { |
| return 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. |
| */ |
| @Override |
| public VariableResolver getVariableResolver() { |
| final PageContext ctx = this; |
| |
| return new VariableResolver() { |
| @Override |
| public Object resolveVariable(String name) throws ELException { |
| return ctx.findAttribute(name); |
| } |
| }; |
| } |
| |
| private ELContext elContext; |
| |
| @Override |
| public ELContext getELContext() { |
| if (elContext == null) { |
| JspApplicationContext jspctx = JspFactory.getDefaultFactory().getJspApplicationContext(getServletContext()); |
| if (jspctx instanceof FreeMarkerJspApplicationContext) { |
| elContext = ((FreeMarkerJspApplicationContext) jspctx).createNewELContext(this); |
| elContext.putContext(JspContext.class, this); |
| } else { |
| throw new UnsupportedOperationException( |
| "Can not create an ELContext using a foreign JspApplicationContext (of class " |
| + ClassUtil.getShortClassNameOfObject(jspctx) + ").\n" + |
| "Hint: The cause of this is often that you are trying to use JSTL tags/functions in FTL. " |
| + "In that case, know that that's not really suppored, and you are supposed to use FTL " |
| + "constrcuts instead, like #list instead of JSTL's forEach, etc."); |
| } |
| } |
| return elContext; |
| } |
| } |