/**
* Copyright (c) 2010-2014, openHAB.org and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*/
package org.openhab.ui.webapp.internal.render;
import org.apache.commons.lang.StringUtils;
import org.eclipse.emf.common.util.EList;
import org.openhab.core.items.GroupItem;
import org.openhab.core.items.Item;
import org.openhab.core.items.ItemNotFoundException;
import org.openhab.model.sitemap.Chart;
import org.openhab.model.sitemap.Widget;
import org.openhab.ui.webapp.render.RenderException;
import org.openhab.ui.webapp.render.WidgetRenderer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This is an implementation of the {@link WidgetRenderer} interface, which
* can produce HTML code for Chart widgets.
*
* @author Kai Kreuzer
* @since 1.0.0
*
*/
public class ChartRenderer extends AbstractWidgetRenderer {
static final private Logger logger = LoggerFactory.getLogger(ChartRenderer.class);
/**
* {@inheritDoc}
*/
public boolean canRender(Widget w) {
return w instanceof Chart;
}
/**
* {@inheritDoc}
*/
public EList<Widget> renderWidget(Widget w, StringBuilder sb) throws RenderException {
Chart chart = (Chart) w;
try {
String itemParam = null;
Item item = itemUIRegistry.getItem(chart.getItem());
if(item instanceof GroupItem) {
itemParam = "groups=" + chart.getItem();
} else {
itemParam = "items=" + chart.getItem();
}
String url = "/chart?" + itemParam + "&period=" + chart.getPeriod() + "&random=1";
if(chart.getService() != null)
url += "&service=" + chart.getService();
String snippet = getSnippet("image");
if(chart.getRefresh()>0) {
snippet = StringUtils.replace(snippet, "%setrefresh%", "<script type=\"text/javascript\">imagesToRefreshOnPage=1</script>");
snippet = StringUtils.replace(snippet, "%refresh%", "id=\"%id%\" onload=\"setTimeout('reloadImage(\\'%url%\\', \\'%id%\\')', " + chart.getRefresh() + ")\"");
} else {
snippet = StringUtils.replace(snippet, "%setrefresh%", "");
snippet = StringUtils.replace(snippet, "%refresh%", "");
}
snippet = StringUtils.replace(snippet, "%id%", itemUIRegistry.getWidgetId(w));
snippet = StringUtils.replace(snippet, "%url%", url);
snippet = StringUtils.replace(snippet, "%refresh%", Integer.toString(chart.getRefresh()));
sb.append(snippet);
} catch (ItemNotFoundException e) {
logger.warn("Chart cannot be rendered as item '{}' does not exist.", chart.getItem());
}
return null;
}
}