/*
 * codeconv.GetResultsTag
 * 
 * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 *
 * Version: @(#)
 *
 * Date: January 13, 2003
 *
 */

package codeconv;

import java.util.Date;
import java.util.Random;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.TagSupport;

/**
 * Retrieves fake lottery results for the given date and returns the
 * result in the given attribute
 *
 * @version @(#)
 * @author Mark Roth
 */
public class GetResultsTag extends TagSupport {

    /** The maximum number that can be drawn */
    private static final int MAX_NUMBER = 58;

    /** The number of numbers that are drawn */
    private static final int NUMBER_COUNT = 6;

    /** The variable to store results to */
    private String var;

    /** The date on which the numbers were drawn */
    private Date date;

    /** The PageContext, used to return the result */
    private PageContext pageContext;

    /**
     * Remember the PageContext so it can be used later 
     * to return the result.
     *
     * @param pageContext The page context of the calling page
     */
    public void setPageContext( PageContext pageContext ) {
        this.pageContext = pageContext;
    }

    /**
     * Returns fake lottery results for the given date.
     *
     * @return EVAL_PAGE so the rest of the page is evaluated.
     */
    public int doEndTag() throws JspException {
        // Generate the (fake) results.
        Random random = new Random( this.date.getTime() );
        int[] result = new int[NUMBER_COUNT];
        for( int i = 0; i < NUMBER_COUNT; i++ ) {
            result[i] = random.nextInt( MAX_NUMBER ) + 1;
        }

        // Place the result in the scoped attribute named by 'var'.
        pageContext.setAttribute( this.var, result );

        return EVAL_PAGE;
    }

    /** 
     * Setter for date 
     *
     * @param date The fake date on which the lottery numbers were drawn
     */
    public void setDate( Date date ) {
        this.date = date;
    }

    /** 
     * Getter for date
     *
     * @return The fake date on which the lottery numbers were drawn
     */
    public Date getDate() {
        return this.date;
    }

    /** 
     * Setter for var
     *
     * @param var The name of the variable to store the result in
     */
    public void setVar( String var ) {
        this.var = var;
    }

    /** 
     * Getter for var
     *
     * @return The name of the variable to restore the result in
     */
    public String getVar() {
        return this.var;
    }
}