inserttag.java

这是一个轻便的j2ee的web应用框架,是一个在多个项目中运用的实际框架,采用struts,hebinate,xml等技术,有丰富的tag,role,navigation,session,dictio

/*
 * $Header: /sfroot/cvs/esimple/src/core/com/esimple/framework/web/taglib/template/InsertTag.java,v 1.1.1.1 2004/09/08 06:38:25 lava Exp $
 * $Revision: 1.1.1.1 $
 * $Date: 2004/09/08 06:38:25 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2001 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 "The Jakarta Project", "Struts", 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 [e-mail].
 *
 * 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 com.esimple.framework.web.taglib.template;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.TagSupport;

import org.apache.struts.Globals;
import org.apache.struts.config.ModuleConfig;
import com.esimple.framework.web.taglib.template.util.Content;
import com.esimple.framework.web.taglib.template.util.ContentMap;
import com.esimple.framework.web.taglib.template.util.ContentMapStack;
import org.apache.struts.util.RequestUtils;

/**
 * This is the tag handler for <template:insert>, which includes 
 * a template. The tag's body content consists of <template:put>
 * tags, which are accessed by <template:get> in the template.
 *
 * @author David Geary
 * @version $Revision: 1.1.1.1 $ $Date: 2004/09/08 06:38:25 $
 * @deprecated Use Tiles instead.
 */
public class InsertTag extends TagSupport {

    // ----------------------------------------------------- Instance Variables

    /**
      * Each insert tag has a map of content. 
      */
    private ContentMap map;

    /**
      * The application-relative URI of the template. 
      */
    private String template;

    // --------------------------------------------------------- Public Methods

    /**
      * Set the template attribute. 
      * @deprecated Use Tiles instead.
      */
    public void setTemplate(String template) {

        this.template = template;

    }

    /**
      * Get the template attribute. 
      * @deprecated Use Tiles instead.
      */
    public String getTemplate() {

        return template;

    }

    /**
      * Get the map attribute. 
      * @deprecated Use Tiles instead.
      */
    public ContentMap getContentMap() {

        return map;

    }

    /**
      * Process the start tag by pushing this tag's map onto the
      * content map stack. 
      * See org.apache.struts.taglib.template.util.ContentMapStack.
      * @deprecated Use Tiles instead.
      */
    public int doStartTag() throws JspException {

        map = new ContentMap();
        ContentMapStack.push(pageContext, map);
        return EVAL_BODY_INCLUDE;

    }

    /**
      * Process the end tag by including the template. 
      * @deprecated Use Tiles instead.
      */
    public int doEndTag() throws JspException {

        String prefix = "";
        ModuleConfig config = RequestUtils.getModuleConfig(pageContext);
        if (config != null) {
            prefix = config.getPrefix();
        }
        try {
            pageContext.include(prefix + template);
        } catch (IOException ex) {
            saveException(ex);
            throw new JspException(ex.getMessage());
        } catch (ServletException ex) {
            saveException(ex);
            throw new JspException(ex.getMessage());
        }
        ContentMapStack.pop(pageContext);
        return EVAL_PAGE;

    }

    /**
      * This method is a convenience for <template:put> tags for
      * putting content into the map.
      * @deprecated Use Tiles instead.
      */
    public void put(String name, Content content) {

        map.put(name, content);

    }

    /**
      * Reset member values for reuse. This method calls super.release(),
      * which invokes TagSupport.release(), which typically does nothing.
      * @deprecated Use Tiles instead.
      */
    public void release() {

        super.release();
        template = null;
        map = null;

    }

    /**
     * Save the specified exception in request scope if there is not already
     * one present.
     *
     * @param exception Exception to be conditionally saved
     * @deprecated Use Tiles instead.
     */
    private void saveException(Throwable exception) {

        if (pageContext.getAttribute(Globals.EXCEPTION_KEY, PageContext.REQUEST_SCOPE) != null) {
            return;
        }
        
        pageContext.setAttribute(Globals.EXCEPTION_KEY, exception, PageContext.REQUEST_SCOPE);
    }

}