/* See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* Esri Inc. licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.esri.gpt.control.livedata;
import com.esri.gpt.control.livedata.selector.HttpRequestDefinition;
import com.esri.gpt.control.livedata.selector.IHttpResponseListener;
import com.esri.gpt.control.livedata.selector.IRegistry;
import com.esri.gpt.control.livedata.selector.ISetter;
import com.esri.gpt.framework.geometry.Envelope;
import com.esri.gpt.framework.http.ResponseInfo;
import com.esri.gpt.framework.util.Val;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* WMS renderer factory.
*/
/*packge*/ class WMSRendererFactory extends MapBasedRendererFactory {
/** get capabilities request */
private static String GET_CAPABILITIES_REQUEST = "service=WMS&request=GetCapabilities";
/** context path */
private String contextPath = "";
/** proxy URL */
private String proxyUrl = "";
@Override
public boolean isDefinitive() {
return true;
}
@Override
public void register(IRegistry reg, final ISetter setter, final String url) {
int qmark = url.lastIndexOf("?");
final String serviceUrl = qmark >= 0 ? url.substring(0, qmark) : url;
final String queryString = qmark >= 0 ? url.substring(qmark + 1) : "";
Query query = new Query(queryString);
if (query.containsKey("service") && !query.get("service").equalsIgnoreCase("WMS"))
return;
query = new Query(GET_CAPABILITIES_REQUEST).mixin(query);
final String getCapabilitiesUrl = serviceUrl + "?" + query;
reg.register(new HttpRequestDefinition(getCapabilitiesUrl), new IHttpResponseListener() {
public void onResponse(ResponseInfo info, String strContent, Document docContent) {
if (docContent != null) {
try {
XPathFactory xPathFactory = XPathFactory.newInstance();
XPath xPath = xPathFactory.newXPath();
Node ndWmsCapabilities = (Node) xPath.evaluate("/WMS_Capabilities", docContent, XPathConstants.NODE);
if (ndWmsCapabilities == null) {
ndWmsCapabilities = (Node) xPath.evaluate("/WMT_MS_Capabilities", docContent, XPathConstants.NODE);
}
if (ndWmsCapabilities != null) {
final Envelope extent = readExtent(xPath, ndWmsCapabilities);
setter.set(new WMSRenderer() {
@Override
protected Envelope getExtent() {
return extent;
}
@Override
protected String getUrl() {
return getCapabilitiesUrl;
}
@Override
protected String getProxyUrl() {
return contextPath + proxyUrl;
}
@Override
protected int getMapHeightAdjustment() {
return getProperties().getMapHeightAdjustment();
}
});
}
} catch (Exception ex) {
}
}
}
});
}
/**
* Creates instance of the factory.
* @param properties properties
* @param contextPath context path
* @param proxyUrl proxy URL
*/
public WMSRendererFactory(ILiveDataProperties properties, String contextPath, String proxyUrl) {
super(properties);
this.contextPath = Val.chkStr(contextPath);
this.proxyUrl = Val.chkStr(proxyUrl);
}
/**
* Reads extent from the capabilities node.
* @param xPath xpath
* @param ndWmsCapabilities capabilities node
* @return envelope or <code>null</code> if envelope can not be created
* @throws javax.xml.xpath.XPathExpressionException if using XPath fails
*/
private Envelope readExtent(XPath xPath, Node ndWmsCapabilities) throws XPathExpressionException {
String wkid = "4326";
Node EX_GeographicBoundingBox = (Node) xPath.evaluate("Capability/Layer/EX_GeographicBoundingBox", ndWmsCapabilities, XPathConstants.NODE);
if (EX_GeographicBoundingBox != null) {
return extractExtent(xPath, EX_GeographicBoundingBox, new String[]{"westBoundLongitude", "southBoundLatitude", "eastBoundLongitude", "northBoundLatitude"}, wkid);
} else {
NodeList nodes = (NodeList) xPath.evaluate("//EX_GeographicBoundingBox", ndWmsCapabilities, XPathConstants.NODESET);
if (nodes.getLength() > 0) {
Envelope envelope = new Envelope();
envelope.setWkid(wkid);
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
Envelope e = extractExtent(xPath, node, new String[]{"westBoundLongitude", "southBoundLatitude", "eastBoundLongitude", "northBoundLatitude"}, wkid);
if (e != null) {
envelope.merge(e);
}
}
if (envelope.hasSize())
return envelope;
}
}
Node LatLonBoundingBox = (Node) xPath.evaluate("Capability/Layer/LatLonBoundingBox", ndWmsCapabilities, XPathConstants.NODE);
if (LatLonBoundingBox != null) {
return extractExtent(xPath, LatLonBoundingBox, new String[]{"@minx", "@miny", "@maxx", "@maxy"}, wkid);
}
return null;
}
private Envelope extractExtent(XPath xPath, Node node, String[] names, String wkid) throws XPathExpressionException {
if (node != null && names != null && names.length == 4) {
String[] values = new String[4];
for (int i = 0; i < 4; i++) {
values[i] = Val.chkStr((String) xPath.evaluate(names[i], node, XPathConstants.STRING));
}
return makeExtent(values[0], values[1], values[2], values[3], wkid);
}
return null;
}
/**
* Creates envelope from string reprezentations of coordinates.
* @param sMinX minx
* @param sMinY miny
* @param sMaxX maxx
* @param sMaxY maxy
* @param wkid wkid
* @return envelope or <code>null</code> if envelope can not be created
*/
private Envelope makeExtent(String sMinX, String sMinY, String sMaxX, String sMaxY, String wkid) {
if (sMinX.length() > 0 && sMaxX.length() > 0 && sMinY.length() > 0 && sMaxY.length() > 0) {
double minx = Val.chkDbl(sMinX, -180.0);
double maxx = Val.chkDbl(sMaxX, 180.0);
double miny = Val.chkDbl(sMinY, -90.0);
double maxy = Val.chkDbl(sMaxY, 90.0);
Envelope envelope = new Envelope(minx, miny, maxx, maxy);
envelope.setWkid(wkid);
return envelope;
}
return null;
}
}