/*
 Wotonomy: OpenStep design patterns for pure Java applications.
 Copyright (C) 2000 Blacksmith, Inc.

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, see http://www.gnu.org
 */

package net.wotonomy.web;

import net.wotonomy.foundation.NSDictionary;

/**
 * WOConditional renders whatever is inside its opening and closing tags only if
 * a condition is met. Bindings are:
 * <ul>
 * <li>condition: a boolean property that indicates whether the contents of the
 * element should be displayed, invoked, or passed the request form values.</li>
 * <li>negate: if this is true, then the behavior of the element is reversed,
 * showing its contents only if the condition is NOT met.</li>
 * </ul>
 *
 * @author ezamudio@nasoft.com
 * @author $Author: cgruber $
 * @version $Revision: 893 $
 */
public class WOConditional extends WODynamicElement {

	public boolean condition;
	public boolean negate;

	protected WOConditional() {
		super();
	}

	public WOConditional(String aName, NSDictionary aMap, WOElement template) {
		super(aName, aMap, template);
	}

	public void setCondition(boolean value) {
		condition = value;
	}

	public boolean condition() {
		return condition;
	}

	public void setNegate(boolean value) {
		negate = value;
	}

	public boolean negate() {
		return negate;
	}

	protected void pullValuesFromParent(WOComponent c) {
		condition = booleanForProperty("condition", c);
		negate = booleanForProperty("negate", c);
	}

	public void takeValuesFromRequest(WORequest aRequest, WOContext aContext) {
		if (rootElement == null)
			return;
		pullValuesFromParent(aContext.component());
		if ((condition && !negate) || (!condition && negate)) {
			rootElement.takeValuesFromRequest(aRequest, aContext);
		}
	}

	public WOActionResults invokeAction(WORequest aRequest, WOContext aContext) {
		if (rootElement == null)
			return null;
		pullValuesFromParent(aContext.component());
		WOActionResults el = null;
		if ((condition && !negate) || (!condition && negate)) {
			el = rootElement.invokeAction(aRequest, aContext);
		}
		return el;
	}

	public void appendToResponse(WOResponse aResponse, WOContext aContext) {
		if (rootElement == null)
			return;
		pullValuesFromParent(aContext.component());
		if ((condition && !negate) || (!condition && negate)) {
			rootElement.appendToResponse(aResponse, aContext);
		}
	}

}