/* 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.webharvest.client.atom;
import java.io.IOException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import com.esri.gpt.framework.geometry.Envelope;
import com.esri.gpt.framework.http.HttpClientRequest;
import com.esri.gpt.framework.http.XmlHandler;
import com.esri.gpt.framework.util.Val;
import com.esri.gpt.framework.xml.DomUtil;
import com.esri.gpt.framework.xml.NodeListAdapter;
import com.esri.gpt.framework.xml.XmlIoUtil;
/**
* Implements IEntryProcessor.extractMetadata() to process entry node
* and extract metadata xml.
*/
public class AGPEntryProcessor implements IEntryProcessor{
/**
* Extracts xml of entry node and returns xml string.
* @param info the BaseAtomInfo object
* @param entry the entry node
* @return the metadata xml string
*/
@Override
public String extractMetadata(BaseAtomInfo info,Node entry) {
String mdText = "";
try {
Document mdDoc = DomUtil.newDocument();
mdDoc.appendChild(mdDoc.importNode(entry, true));
mdText = XmlIoUtil.domToString(mdDoc);
String id = "";
try {
id = parseId(mdDoc);
} catch (XPathExpressionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String georssBox = readBbox(info,id);
mdText = mdText.replace("</entry>", georssBox + "</entry>");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return mdText;
}
/**
* Parses Id from atom entry
* @param doc the feed
* @return the id
* @throws XPathExpressionException
*/
protected String parseId(Document doc) throws XPathExpressionException{
XPath xPath = AtomNamespaceUtil.makeXPath(true);
String id = (String) xPath.evaluate("/atom:entry/atom:id/text()", doc, XPathConstants.STRING);
if(id != null) return id;
return null;
}
/**
* Makes http request to json endpoint and returns georss box string.
* @param info the base atom info
* @param id the item id
* @return the georss box string.
* @throws IOException if the http request fails due to i/o exception
* @throws JSONException if json parsing fails
*/
protected String readBbox(BaseAtomInfo info,String id) throws IOException, JSONException {
String url = info.getUrl();
String georssBox = "<georss:box>";
if(url.length() > 0){
url = url.substring(0,url.indexOf("?"));
String params = "&id="+id+"f=json";
url = url + params;
HttpClientRequest cr = new HttpClientRequest();
cr.setUrl(url);
String response = Val.chkStr(cr.readResponseAsCharacters());
if(response.length() > 0){
JSONObject jso = new JSONObject(response);
if(jso.has("results")){
JSONArray results = jso.getJSONArray("results");
for(int i=0; i < results.length(); i++){
JSONObject result = results.getJSONObject(i);
String idJso = result.getString("id");
if(idJso != id) continue;
JSONArray extentArray = result.getJSONArray("extent");
if (extentArray!=null && extentArray.length()==2) {
String [] lowerCorner = Val.chkStr(extentArray.getJSONArray(0).toString()).replaceAll("^\\[|\\]$", "").split(",");
String [] upperCorner = Val.chkStr(extentArray.getJSONArray(1).toString()).replaceAll("^\\[|\\]$", "").split(",");
double minx = -180, miny = -90, maxx = 180, maxy = 90;
if (lowerCorner!=null && lowerCorner.length==2) {
minx = Val.chkDbl(lowerCorner[0], minx);
miny = Val.chkDbl(lowerCorner[1], miny);
}
if (upperCorner!=null && upperCorner.length==2) {
maxx = Val.chkDbl(upperCorner[0], maxx);
maxy = Val.chkDbl(upperCorner[1], maxy);
}
georssBox += miny + " " + minx + " " + maxy + " " + maxx + "</georss:box>";
}
}
}
}
}
return georssBox;
}
}