Java tutorial
/* 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.server.openls.provider.services.map; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; import java.net.URL; import java.net.URLConnection; import java.util.ArrayList; import java.util.HashMap; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.http.HttpServletRequest; import javax.xml.xpath.XPath; import javax.xml.xpath.XPathConstants; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import org.w3c.dom.Node; import com.esri.gpt.server.csw.provider.components.OwsException; import com.esri.gpt.server.openls.provider.components.IOperationProvider; import com.esri.gpt.server.openls.provider.components.IProviderFactory; import com.esri.gpt.server.openls.provider.components.IResponseGenerator; import com.esri.gpt.server.openls.provider.components.OperationContext; /** * Provides the Openls GetPortrayMapCapabilities operation. */ public class GetPortrayMapCapabilitiesProvider implements IOperationProvider { /** class variables ========================================================= */ /** The Logger. */ private static Logger LOGGER = Logger.getLogger(GetPortrayMapCapabilitiesProvider.class.getName()); /** constructors ============================================================ */ /** Default constructor */ public GetPortrayMapCapabilitiesProvider() { super(); } /** methods ================================================================= */ /** * Executes a parsed operation request. * @param context the operation context * @throws Exception if a processing exception occurs */ private void generateResponse(OperationContext context) throws Exception { IProviderFactory factory = context.getProviderFactory(); IResponseGenerator generator = factory.makeResponseGenerator(context); if (generator == null) { String msg = "IProviderFactory.makeResponseGenerator: instantiation failed."; LOGGER.log(Level.SEVERE, msg); throw new OwsException(msg); } else { generator.generateResponse(context); } } /** * Handles a URL based request (HTTP GET). * @param context the operation context * @param request the HTTP request * @throws Exception if a processing exception occurs */ public void handleGet(OperationContext context, HttpServletRequest request) throws Exception { } /** * Handles an XML based request (normally HTTP POST). * @param context the operation context * @param root the root node * @param xpath an XPath to enable queries (properly configured with name spaces) * @throws Exception if a processing exception occurs */ public void handleXML(OperationContext context, Node root, XPath xpath) throws Exception { // initialize LOGGER.finer("Handling xls:GetPortrayMapCapabilitiesRequest request XML..."); String locator = "xls:GetPortrayMapCapabilitiesRequest"; Node ndReq = (Node) xpath.evaluate(locator, root, XPathConstants.NODE); if (ndReq != null) { // params = processRequest(context, root,ndReq, xpath); try { executeRequest(context); } catch (Throwable e) { e.printStackTrace(); } generateResponse(context); } } /** * Executes get capabilities request. * @param context * @throws Throwable */ public void executeRequest(OperationContext context) throws Throwable { long t1 = System.currentTimeMillis(); GetPortrayMapCapabilitiesParams params = context.getRequestOptions().getGetPortrayMapCapabilitiesOptions(); String srvCfg = context.getRequestContext().getApplicationConfiguration().getCatalogConfiguration() .getParameters().getValue("openls.portrayMap"); String sUrl = srvCfg + "?f=json&pretty=true"; URL url = new URL(sUrl); URLConnection conn = url.openConnection(); String line = ""; String sResponse = ""; InputStream is = conn.getInputStream(); InputStreamReader isr = new InputStreamReader(is); BufferedReader rd = new BufferedReader(isr); while ((line = rd.readLine()) != null) { sResponse += line; } rd.close(); parseResponse(params, sResponse); long t2 = System.currentTimeMillis(); LOGGER.info("PERFORMANCE: " + (t2 - t1) + " ms spent performing service"); } /** * Parse rest response. * @param params * @param sResponse * @throws JSONException */ private void parseResponse(GetPortrayMapCapabilitiesParams params, String sResponse) throws JSONException { HashMap<String, String> layerList = null; ArrayList<String> formatList = null; ArrayList<String> srsList = null; ArrayList<String> styleList = null; JSONObject jResponse = new JSONObject(sResponse); String xResponse = "<?xml version='1.0'?><response>" + org.json.XML.toString(jResponse) + "</response>"; LOGGER.info("XML from JSON = " + xResponse); JSONArray layers = jResponse.getJSONArray("layers"); if (layers != null) { layerList = new HashMap<String, String>(); for (int i = 0; i < layers.length(); i++) { JSONObject layer = layers.getJSONObject(i); layerList.put(layer.getString("name"), layer.getString("id")); } } JSONObject spatialReference = jResponse.getJSONObject("spatialReference"); if (spatialReference != null) { srsList = new ArrayList<String>(); srsList.add(spatialReference.optString("wkid")); } String supportedImageFormatTypes = jResponse.getString("supportedImageFormatTypes"); if (supportedImageFormatTypes != null) { formatList = new ArrayList<String>(); String[] formats = supportedImageFormatTypes.split(","); for (String format : formats) { formatList.add(format); } } params.setLayerMap(layerList); params.setFormatList(formatList); params.setSrsList(srsList); params.setStyleList(styleList); } }