package jsp2.examples.simpletag;

import java.io.IOException;
import java.util.Random;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.JspFragment;
import javax.servlet.jsp.tagext.SimpleTagSupport;

/**
 * SimpleTag handler that accepts takes three attributes of type
 * JspFragment and invokes then in a random order.
 */
public class ShuffleSimpleTag extends SimpleTagSupport {
    // No need for this to use SecureRandom
    private static final Random random = new Random();

    private JspFragment fragment1;
    private JspFragment fragment2;
    private JspFragment fragment3;

    @Override
    public void doTag() throws JspException, IOException {
        switch(random.nextInt(6)) {
            case 0:
                fragment1.invoke( null );
                fragment2.invoke( null );
                fragment3.invoke( null );
                break;
            case 1:
                fragment1.invoke( null );
                fragment3.invoke( null );
                fragment2.invoke( null );
                break;
            case 2:
                fragment2.invoke( null );
                fragment1.invoke( null );
                fragment3.invoke( null );
                break;
            case 3:
                fragment2.invoke( null );
                fragment3.invoke( null );
                fragment1.invoke( null );
                break;
            case 4:
                fragment3.invoke( null );
                fragment1.invoke( null );
                fragment2.invoke( null );
                break;
            case 5:
                fragment3.invoke( null );
                fragment2.invoke( null );
                fragment1.invoke( null );
                break;
        }
    }

    public void setFragment1( JspFragment fragment1 ) {
        this.fragment1 = fragment1;
    }

    public void setFragment2( JspFragment fragment2 ) {
        this.fragment2 = fragment2;
    }

    public void setFragment3( JspFragment fragment3 ) {
        this.fragment3 = fragment3;
    }
}