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package com.sun.xml.bind.webapp;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.Tag;

/**
 * Helper implementation of {@link Tag}.
 * 
 * Derived class should implement the startTag method
 * and the endTag method.
 * 
 * @author
 *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
public abstract class AbstractTagImpl implements Tag {
    
    protected PageContext context;
    protected Tag parent;
    
    public void setPageContext(PageContext context) {
        this.context = context;
    }

    public void setParent(Tag parent) {
        this.parent = parent;
    }

    public Tag getParent() {
        return parent;
    }

    public void release() {
    }
    
    protected final HttpServletRequest getRequest() {
        return (HttpServletRequest)context.getRequest();
    }
    

    public final int doStartTag() throws JspException {
        try {
            return startTag();
        } catch( IOException e ) {
            e.printStackTrace();
            throw new JspException(e.getMessage());
        }
    }
    
    public final int doEndTag() throws JspException {
        try {
            return endTag();
        } catch( IOException e ) {
            e.printStackTrace();
            throw new JspException(e.getMessage());
        }
    }


    protected abstract int startTag() throws JspException, IOException;
    protected abstract int endTag() throws JspException, IOException;


}