bundles/org.apache.tomcat/src/org/apache/jasper/runtime/JspContextWrapper.java - rap/org.apache.tomcat - Git at Google

 /*
  * 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 org.apache.jasper.runtime;

 import java.io.IOException;
 import java.io.Writer;
 import java.util.ArrayList;
 import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;

 import javax.el.ELContext;
 import javax.servlet.Servlet;
 import javax.servlet.ServletConfig;
 import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletResponse;
 import javax.servlet.http.HttpSession;
 import javax.servlet.jsp.JspContext;
 import javax.servlet.jsp.JspWriter;
 import javax.servlet.jsp.PageContext;
 import javax.servlet.jsp.el.ELException;
 import javax.servlet.jsp.el.ExpressionEvaluator;
 import javax.servlet.jsp.el.VariableResolver;
 import javax.servlet.jsp.tagext.BodyContent;
 import javax.servlet.jsp.tagext.VariableInfo;

 import org.apache.jasper.compiler.Localizer;
 import org.apache.jasper.util.Enumerator;

 /**
  * Implementation of a JSP Context Wrapper.
  *
  * The JSP Context Wrapper is a JspContext created and maintained by a tag
  * handler implementation. It wraps the Invoking JSP Context, that is, the
  * JspContext instance passed to the tag handler by the invoking page via
  * setJspContext().
  *
  * @author Kin-man Chung
  * @author Jan Luehe
  * @author Jacob Hookom
  */
 public class JspContextWrapper extends PageContext implements VariableResolver {

     // Invoking JSP context
     private PageContext invokingJspCtxt;

     private transient HashMap<String, Object> pageAttributes;

     // ArrayList of NESTED scripting variables
     private ArrayList<String> nestedVars;

     // ArrayList of AT_BEGIN scripting variables
     private ArrayList<String> atBeginVars;

     // ArrayList of AT_END scripting variables
     private ArrayList<String> atEndVars;

     private Map<String,String> aliases;

     private HashMap<String, Object> originalNestedVars;

     public JspContextWrapper(JspContext jspContext,
             ArrayList<String> nestedVars, ArrayList<String> atBeginVars,
             ArrayList<String> atEndVars, Map<String,String> aliases) {
         this.invokingJspCtxt = (PageContext) jspContext;
         this.nestedVars = nestedVars;
         this.atBeginVars = atBeginVars;
         this.atEndVars = atEndVars;
         this.pageAttributes = new HashMap<String, Object>(16);
         this.aliases = aliases;

         if (nestedVars != null) {
             this.originalNestedVars = new HashMap<String, Object>(nestedVars.size());
         }
         syncBeginTagFile();
     }

     @Override
     public void initialize(Servlet servlet, ServletRequest request,
             ServletResponse response, String errorPageURL,
             boolean needsSession, int bufferSize, boolean autoFlush)
             throws IOException, IllegalStateException, IllegalArgumentException {
     }

     @Override
     public Object getAttribute(String name) {

         if (name == null) {
             throw new NullPointerException(Localizer
                     .getMessage("jsp.error.attribute.null_name"));
         }

         return pageAttributes.get(name);
     }

     @Override
     public Object getAttribute(String name, int scope) {

         if (name == null) {
             throw new NullPointerException(Localizer
                     .getMessage("jsp.error.attribute.null_name"));
         }

         if (scope == PAGE_SCOPE) {
             return pageAttributes.get(name);
         }

         return invokingJspCtxt.getAttribute(name, scope);
     }

     @Override
     public void setAttribute(String name, Object value) {

         if (name == null) {
             throw new NullPointerException(Localizer
                     .getMessage("jsp.error.attribute.null_name"));
         }

         if (value != null) {
             pageAttributes.put(name, value);
         } else {
             removeAttribute(name, PAGE_SCOPE);
         }
     }

     @Override
     public void setAttribute(String name, Object value, int scope) {

         if (name == null) {
             throw new NullPointerException(Localizer
                     .getMessage("jsp.error.attribute.null_name"));
         }

         if (scope == PAGE_SCOPE) {
             if (value != null) {
                 pageAttributes.put(name, value);
             } else {
                 removeAttribute(name, PAGE_SCOPE);
             }
         } else {
             invokingJspCtxt.setAttribute(name, value, scope);
         }
     }

     @Override
     public Object findAttribute(String name) {

         if (name == null) {
             throw new NullPointerException(Localizer
                     .getMessage("jsp.error.attribute.null_name"));
         }

         Object o = pageAttributes.get(name);
         if (o == null) {
             o = invokingJspCtxt.getAttribute(name, REQUEST_SCOPE);
             if (o == null) {
                 if (getSession() != null) {
                     o = invokingJspCtxt.getAttribute(name, SESSION_SCOPE);
                 }
                 if (o == null) {
                     o = invokingJspCtxt.getAttribute(name, APPLICATION_SCOPE);
                 }
             }
         }

         return o;
     }

     @Override
     public void removeAttribute(String name) {

         if (name == null) {
             throw new NullPointerException(Localizer
                     .getMessage("jsp.error.attribute.null_name"));
         }

         pageAttributes.remove(name);
         invokingJspCtxt.removeAttribute(name, REQUEST_SCOPE);
         if (getSession() != null) {
             invokingJspCtxt.removeAttribute(name, SESSION_SCOPE);
         }
         invokingJspCtxt.removeAttribute(name, APPLICATION_SCOPE);
     }

     @Override
     public void removeAttribute(String name, int scope) {

         if (name == null) {
             throw new NullPointerException(Localizer
                     .getMessage("jsp.error.attribute.null_name"));
         }

         if (scope == PAGE_SCOPE) {
             pageAttributes.remove(name);
         } else {
             invokingJspCtxt.removeAttribute(name, scope);
         }
     }

     @Override
     public int getAttributesScope(String name) {

         if (name == null) {
             throw new NullPointerException(Localizer
                     .getMessage("jsp.error.attribute.null_name"));
         }

         if (pageAttributes.get(name) != null) {
             return PAGE_SCOPE;
         } else {
             return invokingJspCtxt.getAttributesScope(name);
         }
     }

     @Override
     public Enumeration<String> getAttributeNamesInScope(int scope) {
         if (scope == PAGE_SCOPE) {
             return new Enumerator<String>(pageAttributes.keySet().iterator());
         }

         return invokingJspCtxt.getAttributeNamesInScope(scope);
     }

     @Override
     public void release() {
         invokingJspCtxt.release();
     }

     @Override
     public JspWriter getOut() {
         return invokingJspCtxt.getOut();
     }

     @Override
     public HttpSession getSession() {
         return invokingJspCtxt.getSession();
     }

     @Override
     public Object getPage() {
         return invokingJspCtxt.getPage();
     }

     @Override
     public ServletRequest getRequest() {
         return invokingJspCtxt.getRequest();
     }

     @Override
     public ServletResponse getResponse() {
         return invokingJspCtxt.getResponse();
     }

     @Override
     public Exception getException() {
         return invokingJspCtxt.getException();
     }

     @Override
     public ServletConfig getServletConfig() {
         return invokingJspCtxt.getServletConfig();
     }

     @Override
     public ServletContext getServletContext() {
         return invokingJspCtxt.getServletContext();
     }

     @Override
     public void forward(String relativeUrlPath) throws ServletException,
             IOException {
         invokingJspCtxt.forward(relativeUrlPath);
     }

     @Override
     public void include(String relativeUrlPath) throws ServletException,
             IOException {
         invokingJspCtxt.include(relativeUrlPath);
     }

     @Override
     public void include(String relativeUrlPath, boolean flush)
             throws ServletException, IOException {
         invokingJspCtxt.include(relativeUrlPath, false);
     }

     @Override
     @Deprecated
     public VariableResolver getVariableResolver() {
         return this;
     }

     @Override
     public BodyContent pushBody() {
         return invokingJspCtxt.pushBody();
     }

     @Override
     public JspWriter pushBody(Writer writer) {
         return invokingJspCtxt.pushBody(writer);
     }

     @Override
     public JspWriter popBody() {
         return invokingJspCtxt.popBody();
     }

     @Override
     @Deprecated
     public ExpressionEvaluator getExpressionEvaluator() {
         return invokingJspCtxt.getExpressionEvaluator();
     }

     @Override
     public void handlePageException(Exception ex) throws IOException,
             ServletException {
         // Should never be called since handleException() called with a
         // Throwable in the generated servlet.
         handlePageException((Throwable) ex);
     }

     @Override
     public void handlePageException(Throwable t) throws IOException,
             ServletException {
         invokingJspCtxt.handlePageException(t);
     }

     /**
      * VariableResolver interface
      */
     @Override
     @Deprecated
     public Object resolveVariable(String pName) throws ELException {
         ELContext ctx = this.getELContext();
         return ctx.getELResolver().getValue(ctx, null, pName);
     }

     /**
      * Synchronize variables at begin of tag file
      */
     public void syncBeginTagFile() {
         saveNestedVariables();
     }

     /**
      * Synchronize variables before fragment invocation
      */
     public void syncBeforeInvoke() {
         copyTagToPageScope(VariableInfo.NESTED);
         copyTagToPageScope(VariableInfo.AT_BEGIN);
     }

     /**
      * Synchronize variables at end of tag file
      */
     public void syncEndTagFile() {
         copyTagToPageScope(VariableInfo.AT_BEGIN);
         copyTagToPageScope(VariableInfo.AT_END);
         restoreNestedVariables();
     }

     /**
      * Copies the variables of the given scope from the virtual page scope of
      * this JSP context wrapper to the page scope of the invoking JSP context.
      *
      * @param scope
      *            variable scope (one of NESTED, AT_BEGIN, or AT_END)
      */
     private void copyTagToPageScope(int scope) {
         Iterator<String> iter = null;

         switch (scope) {
         case VariableInfo.NESTED:
             if (nestedVars != null) {
                 iter = nestedVars.iterator();
             }
             break;
         case VariableInfo.AT_BEGIN:
             if (atBeginVars != null) {
                 iter = atBeginVars.iterator();
             }
             break;
         case VariableInfo.AT_END:
             if (atEndVars != null) {
                 iter = atEndVars.iterator();
             }
             break;
         }

         while ((iter != null) && iter.hasNext()) {
             String varName = iter.next();
             Object obj = getAttribute(varName);
             varName = findAlias(varName);
             if (obj != null) {
                 invokingJspCtxt.setAttribute(varName, obj);
             } else {
                 invokingJspCtxt.removeAttribute(varName, PAGE_SCOPE);
             }
         }
     }

     /**
      * Saves the values of any NESTED variables that are present in the invoking
      * JSP context, so they can later be restored.
      */
     private void saveNestedVariables() {
         if (nestedVars != null) {
             Iterator<String> iter = nestedVars.iterator();
             while (iter.hasNext()) {
                 String varName = iter.next();
                 varName = findAlias(varName);
                 Object obj = invokingJspCtxt.getAttribute(varName);
                 if (obj != null) {
                     originalNestedVars.put(varName, obj);
                 }
             }
         }
     }

     /**
      * Restores the values of any NESTED variables in the invoking JSP context.
      */
     private void restoreNestedVariables() {
         if (nestedVars != null) {
             Iterator<String> iter = nestedVars.iterator();
             while (iter.hasNext()) {
                 String varName = iter.next();
                 varName = findAlias(varName);
                 Object obj = originalNestedVars.get(varName);
                 if (obj != null) {
                     invokingJspCtxt.setAttribute(varName, obj);
                 } else {
                     invokingJspCtxt.removeAttribute(varName, PAGE_SCOPE);
                 }
             }
         }
     }

     /**
      * Checks to see if the given variable name is used as an alias, and if so,
      * returns the variable name for which it is used as an alias.
      *
      * @param varName
      *            The variable name to check
      * @return The variable name for which varName is used as an alias, or
      *         varName if it is not being used as an alias
      */
     private String findAlias(String varName) {

         if (aliases == null)
             return varName;

         String alias = aliases.get(varName);
         if (alias == null) {
             return varName;
         }
         return alias;
     }

     //private ELContextImpl elContext;

     @Override
     public ELContext getELContext() {
         // instead decorate!!!

         return this.invokingJspCtxt.getELContext();

         /*
         if (this.elContext != null) {
             JspFactory jspFact = JspFactory.getDefaultFactory();
             ServletContext servletContext = this.getServletContext();
             JspApplicationContextImpl jspCtx = (JspApplicationContextImpl) jspFact
                     .getJspApplicationContext(servletContext);
             this.elContext = jspCtx.createELContext(this);
         }
         return this.elContext;
         */
     }
 }
	/*
	* 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 org.apache.jasper.runtime;

	import java.io.IOException;
	import java.io.Writer;
	import java.util.ArrayList;
	import java.util.Enumeration;
	import java.util.HashMap;
	import java.util.Iterator;
	import java.util.Map;

	import javax.el.ELContext;
	import javax.servlet.Servlet;
	import javax.servlet.ServletConfig;
	import javax.servlet.ServletContext;
	import javax.servlet.ServletException;
	import javax.servlet.ServletRequest;
	import javax.servlet.ServletResponse;
	import javax.servlet.http.HttpSession;
	import javax.servlet.jsp.JspContext;
	import javax.servlet.jsp.JspWriter;
	import javax.servlet.jsp.PageContext;
	import javax.servlet.jsp.el.ELException;
	import javax.servlet.jsp.el.ExpressionEvaluator;
	import javax.servlet.jsp.el.VariableResolver;
	import javax.servlet.jsp.tagext.BodyContent;
	import javax.servlet.jsp.tagext.VariableInfo;

	import org.apache.jasper.compiler.Localizer;
	import org.apache.jasper.util.Enumerator;

	/**
	* Implementation of a JSP Context Wrapper.
	*
	* The JSP Context Wrapper is a JspContext created and maintained by a tag
	* handler implementation. It wraps the Invoking JSP Context, that is, the
	* JspContext instance passed to the tag handler by the invoking page via
	* setJspContext().
	*
	* @author Kin-man Chung
	* @author Jan Luehe
	* @author Jacob Hookom
	*/
	public class JspContextWrapper extends PageContext implements VariableResolver {

	// Invoking JSP context
	private PageContext invokingJspCtxt;

	private transient HashMap<String, Object> pageAttributes;

	// ArrayList of NESTED scripting variables
	private ArrayList<String> nestedVars;

	// ArrayList of AT_BEGIN scripting variables
	private ArrayList<String> atBeginVars;

	// ArrayList of AT_END scripting variables
	private ArrayList<String> atEndVars;

	private Map<String,String> aliases;

	private HashMap<String, Object> originalNestedVars;

	public JspContextWrapper(JspContext jspContext,
	ArrayList<String> nestedVars, ArrayList<String> atBeginVars,
	ArrayList<String> atEndVars, Map<String,String> aliases) {
	this.invokingJspCtxt = (PageContext) jspContext;
	this.nestedVars = nestedVars;
	this.atBeginVars = atBeginVars;
	this.atEndVars = atEndVars;
	this.pageAttributes = new HashMap<String, Object>(16);
	this.aliases = aliases;

	if (nestedVars != null) {
	this.originalNestedVars = new HashMap<String, Object>(nestedVars.size());
	}
	syncBeginTagFile();
	}

	@Override
	public void initialize(Servlet servlet, ServletRequest request,
	ServletResponse response, String errorPageURL,
	boolean needsSession, int bufferSize, boolean autoFlush)
	throws IOException, IllegalStateException, IllegalArgumentException {
	}

	@Override
	public Object getAttribute(String name) {

	if (name == null) {
	throw new NullPointerException(Localizer
	.getMessage("jsp.error.attribute.null_name"));
	}

	return pageAttributes.get(name);
	}

	@Override
	public Object getAttribute(String name, int scope) {

	if (name == null) {
	throw new NullPointerException(Localizer
	.getMessage("jsp.error.attribute.null_name"));
	}

	if (scope == PAGE_SCOPE) {
	return pageAttributes.get(name);
	}

	return invokingJspCtxt.getAttribute(name, scope);
	}

	@Override
	public void setAttribute(String name, Object value) {

	if (name == null) {
	throw new NullPointerException(Localizer
	.getMessage("jsp.error.attribute.null_name"));
	}

	if (value != null) {
	pageAttributes.put(name, value);
	} else {
	removeAttribute(name, PAGE_SCOPE);
	}
	}

	@Override
	public void setAttribute(String name, Object value, int scope) {

	if (name == null) {
	throw new NullPointerException(Localizer
	.getMessage("jsp.error.attribute.null_name"));
	}

	if (scope == PAGE_SCOPE) {
	if (value != null) {
	pageAttributes.put(name, value);
	} else {
	removeAttribute(name, PAGE_SCOPE);
	}
	} else {
	invokingJspCtxt.setAttribute(name, value, scope);
	}
	}

	@Override
	public Object findAttribute(String name) {

	if (name == null) {
	throw new NullPointerException(Localizer
	.getMessage("jsp.error.attribute.null_name"));
	}

	Object o = pageAttributes.get(name);
	if (o == null) {
	o = invokingJspCtxt.getAttribute(name, REQUEST_SCOPE);
	if (o == null) {
	if (getSession() != null) {
	o = invokingJspCtxt.getAttribute(name, SESSION_SCOPE);
	}
	if (o == null) {
	o = invokingJspCtxt.getAttribute(name, APPLICATION_SCOPE);
	}
	}
	}

	return o;
	}

	@Override
	public void removeAttribute(String name) {

	if (name == null) {
	throw new NullPointerException(Localizer
	.getMessage("jsp.error.attribute.null_name"));
	}

	pageAttributes.remove(name);
	invokingJspCtxt.removeAttribute(name, REQUEST_SCOPE);
	if (getSession() != null) {
	invokingJspCtxt.removeAttribute(name, SESSION_SCOPE);
	}
	invokingJspCtxt.removeAttribute(name, APPLICATION_SCOPE);
	}

	@Override
	public void removeAttribute(String name, int scope) {

	if (name == null) {
	throw new NullPointerException(Localizer
	.getMessage("jsp.error.attribute.null_name"));
	}

	if (scope == PAGE_SCOPE) {
	pageAttributes.remove(name);
	} else {
	invokingJspCtxt.removeAttribute(name, scope);
	}
	}

	@Override
	public int getAttributesScope(String name) {

	if (name == null) {
	throw new NullPointerException(Localizer
	.getMessage("jsp.error.attribute.null_name"));
	}

	if (pageAttributes.get(name) != null) {
	return PAGE_SCOPE;
	} else {
	return invokingJspCtxt.getAttributesScope(name);
	}
	}

	@Override
	public Enumeration<String> getAttributeNamesInScope(int scope) {
	if (scope == PAGE_SCOPE) {
	return new Enumerator<String>(pageAttributes.keySet().iterator());
	}

	return invokingJspCtxt.getAttributeNamesInScope(scope);
	}

	@Override
	public void release() {
	invokingJspCtxt.release();
	}

	@Override
	public JspWriter getOut() {
	return invokingJspCtxt.getOut();
	}

	@Override
	public HttpSession getSession() {
	return invokingJspCtxt.getSession();
	}

	@Override
	public Object getPage() {
	return invokingJspCtxt.getPage();
	}

	@Override
	public ServletRequest getRequest() {
	return invokingJspCtxt.getRequest();
	}

	@Override
	public ServletResponse getResponse() {
	return invokingJspCtxt.getResponse();
	}

	@Override
	public Exception getException() {
	return invokingJspCtxt.getException();
	}

	@Override
	public ServletConfig getServletConfig() {
	return invokingJspCtxt.getServletConfig();
	}

	@Override
	public ServletContext getServletContext() {
	return invokingJspCtxt.getServletContext();
	}

	@Override
	public void forward(String relativeUrlPath) throws ServletException,
	IOException {
	invokingJspCtxt.forward(relativeUrlPath);
	}

	@Override
	public void include(String relativeUrlPath) throws ServletException,
	IOException {
	invokingJspCtxt.include(relativeUrlPath);
	}

	@Override
	public void include(String relativeUrlPath, boolean flush)
	throws ServletException, IOException {
	invokingJspCtxt.include(relativeUrlPath, false);
	}

	@Override
	@Deprecated
	public VariableResolver getVariableResolver() {
	return this;
	}

	@Override
	public BodyContent pushBody() {
	return invokingJspCtxt.pushBody();
	}

	@Override
	public JspWriter pushBody(Writer writer) {
	return invokingJspCtxt.pushBody(writer);
	}

	@Override
	public JspWriter popBody() {
	return invokingJspCtxt.popBody();
	}

	@Override
	@Deprecated
	public ExpressionEvaluator getExpressionEvaluator() {
	return invokingJspCtxt.getExpressionEvaluator();
	}

	@Override
	public void handlePageException(Exception ex) throws IOException,
	ServletException {
	// Should never be called since handleException() called with a
	// Throwable in the generated servlet.
	handlePageException((Throwable) ex);
	}

	@Override
	public void handlePageException(Throwable t) throws IOException,
	ServletException {
	invokingJspCtxt.handlePageException(t);
	}

	/**
	* VariableResolver interface
	*/
	@Override
	@Deprecated
	public Object resolveVariable(String pName) throws ELException {
	ELContext ctx = this.getELContext();
	return ctx.getELResolver().getValue(ctx, null, pName);
	}

	/**
	* Synchronize variables at begin of tag file
	*/
	public void syncBeginTagFile() {
	saveNestedVariables();
	}

	/**
	* Synchronize variables before fragment invocation
	*/
	public void syncBeforeInvoke() {
	copyTagToPageScope(VariableInfo.NESTED);
	copyTagToPageScope(VariableInfo.AT_BEGIN);
	}

	/**
	* Synchronize variables at end of tag file
	*/
	public void syncEndTagFile() {
	copyTagToPageScope(VariableInfo.AT_BEGIN);
	copyTagToPageScope(VariableInfo.AT_END);
	restoreNestedVariables();
	}

	/**
	* Copies the variables of the given scope from the virtual page scope of
	* this JSP context wrapper to the page scope of the invoking JSP context.
	*
	* @param scope
	* variable scope (one of NESTED, AT_BEGIN, or AT_END)
	*/
	private void copyTagToPageScope(int scope) {
	Iterator<String> iter = null;

	switch (scope) {
	case VariableInfo.NESTED:
	if (nestedVars != null) {
	iter = nestedVars.iterator();
	}
	break;
	case VariableInfo.AT_BEGIN:
	if (atBeginVars != null) {
	iter = atBeginVars.iterator();
	}
	break;
	case VariableInfo.AT_END:
	if (atEndVars != null) {
	iter = atEndVars.iterator();
	}
	break;
	}

	while ((iter != null) && iter.hasNext()) {
	String varName = iter.next();
	Object obj = getAttribute(varName);
	varName = findAlias(varName);
	if (obj != null) {
	invokingJspCtxt.setAttribute(varName, obj);
	} else {
	invokingJspCtxt.removeAttribute(varName, PAGE_SCOPE);
	}
	}
	}

	/**
	* Saves the values of any NESTED variables that are present in the invoking
	* JSP context, so they can later be restored.
	*/
	private void saveNestedVariables() {
	if (nestedVars != null) {
	Iterator<String> iter = nestedVars.iterator();
	while (iter.hasNext()) {
	String varName = iter.next();
	varName = findAlias(varName);
	Object obj = invokingJspCtxt.getAttribute(varName);
	if (obj != null) {
	originalNestedVars.put(varName, obj);
	}
	}
	}
	}

	/**
	* Restores the values of any NESTED variables in the invoking JSP context.
	*/
	private void restoreNestedVariables() {
	if (nestedVars != null) {
	Iterator<String> iter = nestedVars.iterator();
	while (iter.hasNext()) {
	String varName = iter.next();
	varName = findAlias(varName);
	Object obj = originalNestedVars.get(varName);
	if (obj != null) {
	invokingJspCtxt.setAttribute(varName, obj);
	} else {
	invokingJspCtxt.removeAttribute(varName, PAGE_SCOPE);
	}
	}
	}
	}

	/**
	* Checks to see if the given variable name is used as an alias, and if so,
	* returns the variable name for which it is used as an alias.
	*
	* @param varName
	* The variable name to check
	* @return The variable name for which varName is used as an alias, or
	* varName if it is not being used as an alias
	*/
	private String findAlias(String varName) {

	if (aliases == null)
	return varName;

	String alias = aliases.get(varName);
	if (alias == null) {
	return varName;
	}
	return alias;
	}

	//private ELContextImpl elContext;

	@Override
	public ELContext getELContext() {
	// instead decorate!!!

	return this.invokingJspCtxt.getELContext();

	/*
	if (this.elContext != null) {
	JspFactory jspFact = JspFactory.getDefaultFactory();
	ServletContext servletContext = this.getServletContext();
	JspApplicationContextImpl jspCtx = (JspApplicationContextImpl) jspFact
	.getJspApplicationContext(servletContext);
	this.elContext = jspCtx.createELContext(this);
	}
	return this.elContext;
	*/
	}
	}