OverrideTag.java

package cn.org.rapid_framework.web.tags;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.BodyTagSupport;
/**
 * @author badqiu
 */
public class OverrideTag extends BodyTagSupport{
	private static final long serialVersionUID = -8379959647039117369L;
	
	private String name;
	
	public void setName(String name) {
		this.name = name;
	}

	@Override
	public int doStartTag() throws JspException {
		return isOverrided() ? SKIP_BODY : EVAL_BODY_BUFFERED;
	}

	@Override
	public int doEndTag() throws JspException {
		if(isOverrided()) {
			return EVAL_PAGE;
		}
		BodyContent b = getBodyContent();
//		System.out.println("Override.content:"+b.getString());
		String varName = Utils.getOverrideVariableName(name);

		pageContext.getRequest().setAttribute(varName, b.getString());
		return EVAL_PAGE;
	}

	private boolean isOverrided() {
		String varName = Utils.getOverrideVariableName(name);
		return pageContext.getRequest().getAttribute(varName) != null;
	}
	
}