zkoss/zk

/* When.java

    Purpose:
        
    Description:
        
    History:
        Tue Sep  6 15:33:29     2005, Created by tomyeh

Copyright (C) 2005 Potix Corporation. All Rights Reserved.

{{IS_RIGHT
    This program is distributed under LGPL Version 2.1 in the hope that
    it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.web.servlet.dsp.action;

import java.io.IOException;

import org.zkoss.web.servlet.dsp.DspException;

/**
 * Represents an alternative within a {@link Choose} action.
 * 
 * @author tomyeh
 */
public class When extends AbstractAction {
    private boolean _cond;

    /** Returns the test result. */
    public boolean getTest() {
        return _cond;
    }

    /** Sets the test result. */
    public void setTest(boolean cond) {
        _cond = cond;
    }

    //-- Action --//
    public void render(ActionContext ac, boolean nested) throws DspException, IOException {
        if (!isEffective())
            return;

        final Action parent = ac.getParent();
        if (!(parent instanceof Choose))
            throw new DspException("The parent of when must be choose");

        final Choose choose = (Choose) parent;
        if (_cond && !choose.isMatched()) {
            choose.setMatched(true);
            if (nested)
                ac.renderFragment(null);
        }
    }

    //-- Object --//
    public String toString() {
        return "otherwise";
    }
}