package com.acme.tag;

import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

/**
 * A simple Tag that displays a Hello World message.
 * @author Magnus Rydin
 */
public class HelloWorldTag implements Tag
{
  private PageContext pageContext;
  private Tag parent;

  /**
   * Constructor
   */
  public HelloWorldTag()
  {
    super();
  }

  /**
   * Method called at start of Tag
   * @return either a EVAL_BODY_INCLUDE or a SKIP_BODY
   */
  public int doStartTag() throws javax.servlet.jsp.JspTagException
  {
    return SKIP_BODY;
  }

  /**
   * Method Called at end of Tag
   * @return either EVAL_PAGE or SKIP_PAGE
   */
  public int doEndTag() throws javax.servlet.jsp.JspTagException
  {
    try
    {
      pageContext.getOut().write("Hello World!");
    }
    catch(java.io.IOException e)
    {
      throw new JspTagException("IO Error: " + e.getMessage());
    }
    return EVAL_PAGE;
  }

  /**
   * Method called to releases all resources
   */
  public void release() {}

  /** Method used by the JSP container to set the current PageContext
   * @param pageContext, the current PageContext
   */
  public void setPageContext(final javax.servlet.jsp.PageContext pageContext)
  {
    this.pageContext=pageContext;
  }

  /** Method used by the JSP container to set the parent of the Tag
   * @param parent, the parent Tag
   */
  public void setParent(final javax.servlet.jsp.tagext.Tag parent)
  {
    this.parent=parent;
  }

  /** Method for retrieving the parent
   * @return the parent
   */
  public javax.servlet.jsp.tagext.Tag getParent() {
    return parent;
  }
}