hierarchynodetag.java

老外的在线考试

/*
 * CyberTester - J2EE Web application for creating, delivering and managing tests/exams/surveys. 
 * Copyright (C) 2004 CyberDemia Research and Services Pty Ltd
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program (see the file COPYING); if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * See the COPYING file located in the top-level-directory of
 * the archive of this program for complete text of license.
 */
package com.cyberdemia.cybertester.tag;

import java.util.Iterator;
import java.util.List;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;

import com.cyberdemia.cybertester.admin.AdminConstants;
import com.cyberdemia.school.IHierarchy;
import com.cyberdemia.school.SchoolUtils;
import com.cyberdemia.util.StringUtils;


/**
 * HierarchyNodeTag renders the full path to the current hierarchy node
 * that is stored as a session attribute.
 * 
 * @author Alexander Yap
 * @version $Revision: 1.3 $ at $Date: 2004/06/12 12:52:16 $ by $Author: alexycyap $
 */
public class HierarchyNodeTag extends TagSupport
{
    public int doStartTag() throws JspException
    {
        try
        {
 			String currentHierId = m_hierNodeId;
 			if (currentHierId==null)
 			{
 				currentHierId = (String)pageContext.getSession().getAttribute(AdminConstants.SELECTED_HIERARCHY_ID_KEY);
 			}
 			
 			if (currentHierId!=null)
    		{
    			IHierarchy currentHierNode = SchoolUtils.getNodeFromHierarchyId(currentHierId);
    			List hierPathElemList = SchoolUtils.getHierarchyNodeList(currentHierNode );
    			JspWriter outWriter = pageContext.getOut();
    			outWriter.println("<table width=\"100%\" class=\"viewer\" >");
    			Iterator hierPathElemIter = hierPathElemList.iterator();
    			while (hierPathElemIter.hasNext())
    			{
    				IHierarchy node = (IHierarchy)hierPathElemIter.next();
    				outWriter.print("<tr>");
    				outWriter.print("<th class=\"label\" width=\"1%\">");
    				outWriter.print( StringUtils.escapeHTML(node.getType(),true));
    				outWriter.print("</th><td class=\"value\" width=\"99%\">");
    				outWriter.print( StringUtils.escapeHTML(node.getName(),true));
    				outWriter.println("</td></tr>");
    			}
    			outWriter.println("</table>");
    		}
        }
        catch (Exception ex)
        {
            throw new JspTagException("HierarchyNodeTag : "+ex.getMessage());
        }

        return SKIP_BODY;
    }
    
    public void setHierarchyNodeId(String hierIdExpr)
    {
        try
        {
        	m_hierNodeId = ExpressionEvaluatorManager.evaluate("hierarchyNodeId", hierIdExpr, String.class, this, pageContext).toString();
        }
        catch (JspException ex)
        {
        	m_hierNodeId = null;
        }
    }

    private String m_hierNodeId=null;
}