templatetag.java

Tree taglib,生成树的标签库

/*
    Copyright 2004 Jenkov Development

    Licensed 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 com.jenkov.prizetags.template.impl;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
//todo make it possible to store the template in the application context, and reuse it,
//instead of rebuilding on every request

/**
 * @author Jakob Jenkov
 *         Copyright 2004 Jenkov Development
 */
public class TemplateTag extends TagSupport{

    protected Template template = null;
    protected String   name     = null;
    protected String   extend   = null;

    public int doStartTag() throws JspException {
        if(getExtend() == null){
            template = new Template(getId());
            pageContext.getRequest().setAttribute(getName(), template);
        } else {
            Template extend = (Template) pageContext.getRequest().getAttribute(getExtend());
            if(extend == null){
                throw new JspException("The template to extend, " + getExtend() + ", " +
                        " could not be found in the request attributes. Wrong template name?");
            }
            template = new Template( getId(), extend);
            pageContext.getRequest().setAttribute(getName(), template);
        }
        return EVAL_BODY_INCLUDE;
    }

    public Template getTemplate() {
        return template;
    }


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getExtend() {
        return extend;
    }

    public void setExtend(String extend) {
        this.extend = extend;
    }
}