/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
* This code is licensed under the GPL 2.0 license, availible at the root
* application directory.
*/
package org.vfny.geoserver.wms.requests;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.http.HttpServletRequest;
import org.geoserver.catalog.LayerInfo;
import org.geoserver.platform.ServiceException;
import org.geoserver.wms.MapLayerInfo;
import org.geoserver.wms.WMS;
import org.geoserver.wms.WMSInfo;
import org.vfny.geoserver.Request;
import org.vfny.geoserver.wms.WmsException;
/**
* Parses a DescribeLayer request, wich consists only of a list of layer names, given by the
* <code>"LAYER"</code> parameter.
*
*
* @author Gabriel Roldan, Axios Engineering
* @version $Id: DescribeLayerKvpRequestReader.java 11575 2009-03-02 04:01:02Z groldan $
*/
public class DescribeLayerKvpRequestReader extends WmsKvpRequestReader {
/** package's logger */
private static final Logger LOGGER = org.geotools.util.logging.Logging
.getLogger(DescribeLayerKvpRequestReader.class.getPackage().getName());
private WMS wms;
/**
* Constructs a new DescribeLayer request parser.
*
* @param params
* @param service
* The wms service config.
*/
public DescribeLayerKvpRequestReader(Map params, WMS wms) {
super(params, wms);
this.wms = wms;
}
/**
* Does the request parsing and constructs a <code>DescribeLayerRequest</code>, wich holds the
* requiered layers as <code>FeatureTypeInfo</code> references.
*
* @param request
* the original request.
*
* @return the parsed and validated <code>DescribeLayerRequest</code>
*
* @throws ServiceException
* see "throws WmsException"...
* @throws WmsException
* if no layers has been requested, or one of the requested layers does not exists
* on this server instance, or the version parameter was not provided.
*/
public Request getRequest(HttpServletRequest request) throws ServiceException {
if (request == null) {
throw new NullPointerException("request");
}
DescribeLayerRequest req = new DescribeLayerRequest(wms);
req.setHttpServletRequest(request);
final String version = getValue("VERSION");
if (null == version) {
// spec allows to use custom exception codes, so we'll use
// NoVersionInfo here. No need to define it as a DTD extension
// though
throw new WmsException("Version parameter not provided for DescribeLayer operation",
"NoVersionInfo", getClass().getSimpleName());
}
if (!wms.getVersion().equals(version)) {
// spec allows to use custom exception codes, so we'll use
// InvalidVersion here. No need to define it as a DTD extension
// though
throw new WmsException("Wrong value for version parameter: " + version
+ ". This server accetps version " + getWMS().getVersion(), "InvalidVersion",
getClass().getSimpleName());
}
req.setVersion(version);
String layersParam = getValue("LAYERS");
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine(layersParam);
}
List<String> layers = readFlat(layersParam, INNER_DELIMETER);
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine(layers.toString());
}
int layerCount = layers.size();
if (layerCount == 0) {
throw new WmsException("No LAYERS has been requested", "NoLayerRequested", getClass()
.getName());
}
String layerName = null;
MapLayerInfo layer = null;
for (int i = 0; i < layerCount; i++) {
layerName = (String) layers.get(i);
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine(new StringBuffer("Looking for layer ").append(layerName).toString());
}
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine("looking featuretypeinfos");
}
LayerInfo layerInfo = wms.getLayerByName(layerName);
if (layerInfo == null) {
throw new WmsException(layerName + ": no such layer on this server",
"LayerNotDefined", getClass().getSimpleName());
}
layer = new MapLayerInfo(layerInfo);
req.addLayer(layer);
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine(new StringBuffer(layerName).append(" found").toString());
}
}
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine(new StringBuffer("parsed request ").append(req).toString());
}
return req;
}
}