/*
 * GNU LESSER GENERAL PUBLIC LICENSE Copyright (C) 2006 The XAMJ Project
 * 
 * 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 * Contact info: lobochief@users.sourceforge.net
 */
package com.nvarghese.beowulf.common.cobra.html.js;

import com.nvarghese.beowulf.common.cobra.html.HtmlRendererContext;
import com.nvarghese.beowulf.common.cobra.js.AbstractScriptableDelegate;

public class History extends AbstractScriptableDelegate {

	private final Window window;

	History(Window window) {

		this.window = window;
	}

	public String getCurrent() {

		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		return ctx != null ? ctx.getCurrentURL() : null;
	}

	public String getNext() {

		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		return ctx != null ? ctx.getNextURL() : null;
	}

	public String getPrevious() {

		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		return ctx != null ? ctx.getPreviousURL() : null;
	}

	public int getLength() {

		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		return ctx != null ? ctx.getHistoryLength() : 0;
	}

	public void back() {

		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		if (ctx != null) {
			ctx.back();
		}
	}

	public void forward() {

		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		if (ctx != null) {
			ctx.forward();
		}
	}

	public void go(int offset) {

		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		if (ctx != null) {
			ctx.moveInHistory(offset);
		}
	}

	public void go(String url) {

		HtmlRendererContext ctx = this.window.getHtmlRendererContext();
		if (ctx != null) {
			ctx.goToHistoryURL(url);
		}
	}
}