package com.brainysoftware;

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

public class PowerTag implements IterationTag {
  PageContext pageContext;

  private int number;
  private int power;
  private int counter;
  private int result = 1;

  // the setter for number
  public void setNumber(int number) {
    this.number = number;
  }

  // the setter for power
  public void setPower(int power) {
    this.power = power;
  }

  public void setParent(Tag t) {
  }

  public void setPageContext(PageContext p) {
    pageContext = p;
  }

  public void release() {
  }

  public Tag getParent() {
    return null;
  }

  public int doStartTag() {
    return EVAL_BODY_INCLUDE;
  }

  public int doAfterBody() {
    counter++;
    result *= number;
    if (counter==power)
      return SKIP_BODY;
    else 
      return EVAL_BODY_AGAIN;
  }

  public int doEndTag() throws JspException {
    System.out.println("doEndTag");
    try {
      JspWriter out = pageContext.getOut();
      out.println(number + "^" + power + "=" + result);
    }
    catch(Exception e) {
    }
    return EVAL_PAGE;
  }
}