taglib/src/org/apache/taglibs/bsf/expression.java

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "Apache BSF", "Apache", and "Apache Software Foundation"
 *    must not be used to endorse or promote products derived from
 *    this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many individuals
 * on behalf of the Apache Software Foundation. For more information on the
 * Apache Software Foundation, please see <http://www.apache.org/>.
 */

package org.apache.taglibs.bsf;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.BodyTag;

import javax.servlet.jsp.*;
import java.security.*;

import org.apache.bsf.*;

public class expression extends bsftag implements BodyTag
{
    public int doEndTag() throws JspException {
        try {
            final BodyContent bodyOut = getBodyContent();

            JspWriter out = pageContext.getOut();
            if (bodyOut == null) return EVAL_PAGE;

            if (mgr == null) mgr = new BSFManager();
            final BSFEngine engine = mgr.loadScriptingEngine(language);

            try {
                register( mgr, "request"    , pageContext.getRequest());
                register( mgr, "response"   , pageContext.getResponse());
                register( mgr, "pageContext", pageContext);
                register( mgr, "application", pageContext.getServletContext());
                register( mgr, "out"        , out);
                register( mgr, "config"     , pageContext.getServletConfig());
                register( mgr, "page"       , pageContext.getPage());
                register( mgr, "exception"  , pageContext.getException());
                register( mgr, "session"    , pageContext.getSession());
            } 
            catch( Exception e ) {
                out.println(e.toString());
                e.printStackTrace();
            }

            Object result = null;
            try {
                result =
                    AccessController.doPrivileged(new PrivilegedExceptionAction() {
                                                      public Object run() throws Exception {
                                                          HttpServletRequest pnamer = 
                        (HttpServletRequest) 
                        pageContext.getRequest();
                    String pthinfo = 
                        (pnamer.getPathInfo() != null) ? 
                        pnamer.getPathInfo() : "";
                    return engine.eval (pnamer.getContextPath() +
                                        pnamer.getServletPath() +
                                        pthinfo,
                                        lineNo++, 0, bodyOut.getString());
                                                      }
                                                  });
            }
            catch (PrivilegedActionException prive) {
                throw (BSFException) prive.getException();
            }

            if (result != null) out.println(result.toString());
        } 
        catch( Exception e ) {
            System.out.println(e.toString());
            e.printStackTrace();
        }

        return EVAL_PAGE;
    }
}