/**
* Writes layer LegendURL pointing to the user supplied icon URL, if any, or to the proper
* GetLegendGraphic operation if an URL was not supplied by configuration file.
*
* <p>It is common practice to supply a URL to a WMS accesible legend graphic when it is
* difficult to create a dynamic legend for a layer.
*
* @param ft The FeatureTypeInfo that holds the legendURL to write out, or<code>null</code> if
* dynamically generated.
* @task TODO: figure out how to unhack legend parameters such as WIDTH, HEIGHT and FORMAT
*/
protected void handleLegendURL(String layerName, LegendInfo legend, StyleInfo style) {
if (legend != null) {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine("using user supplied legend URL");
}
AttributesImpl attrs = new AttributesImpl();
attrs.addAttribute("", "width", "width", "", String.valueOf(legend.getWidth()));
attrs.addAttribute("", "height", "height", "", String.valueOf(legend.getHeight()));
start("LegendURL", attrs);
element("Format", legend.getFormat());
attrs.clear();
attrs.addAttribute("", "xmlns:xlink", "xmlns:xlink", "", XLINK_NS);
attrs.addAttribute(XLINK_NS, "type", "xlink:type", "", "simple");
attrs.addAttribute(XLINK_NS, "href", "xlink:href", "", legend.getOnlineResource());
element("OnlineResource", null, attrs);
end("LegendURL");
} else {
String defaultFormat = GetLegendGraphicRequest.DEFAULT_FORMAT;
if (null == wmsConfig.getLegendGraphicOutputFormat(defaultFormat)) {
if (LOGGER.isLoggable(Level.WARNING)) {
LOGGER.warning(
new StringBuffer("Default legend format (")
.append(defaultFormat)
.append(")is not supported (jai not available?), can't add LegendURL element")
.toString());
}
return;
}
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine("Adding GetLegendGraphic call as LegendURL");
}
AttributesImpl attrs = new AttributesImpl();
attrs.addAttribute(
"", "width", "width", "", String.valueOf(GetLegendGraphicRequest.DEFAULT_WIDTH));
// DJB: problem here is that we do not know the size of the
// legend apriori - we need
// to make one and find its height. Not the best way, but it
// would work quite well.
// This was advertising a 20*20 icon, but actually producing
// ones of a different size.
// An alternative is to just scale the resulting icon to what
// the server requested, but this isnt
// the nicest thing since warped images dont look nice. The
// client should do the warping.
// however, to actually estimate the size is a bit difficult.
// I'm going to do the scaling
// so it obeys the what the request says. For people with a
// problem with that should consider
// changing the default size here so that the request is for the
// correct size.
attrs.addAttribute(
"", "height", "height", "", String.valueOf(GetLegendGraphicRequest.DEFAULT_HEIGHT));
start("LegendURL", attrs);
element("Format", defaultFormat);
attrs.clear();
Map<String, String> params =
params(
"request",
"GetLegendGraphic",
"format",
defaultFormat,
"width",
String.valueOf(GetLegendGraphicRequest.DEFAULT_WIDTH),
"height",
String.valueOf(GetLegendGraphicRequest.DEFAULT_HEIGHT),
"layer",
layerName);
if (style != null) {
params.put("style", style.getName());
}
String legendURL = buildURL(request.getBaseUrl(), "wms", params, URLType.SERVICE);
attrs.addAttribute("", "xmlns:xlink", "xmlns:xlink", "", XLINK_NS);
attrs.addAttribute(XLINK_NS, "type", "xlink:type", "", "simple");
attrs.addAttribute(XLINK_NS, "href", "xlink:href", "", legendURL);
element("OnlineResource", null, attrs);
end("LegendURL");
}
}
