mayo.edu.server.JsonServiceImpl.java Source code

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Here is the source code for mayo.edu.server.JsonServiceImpl.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF 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 mayo.edu.server;

import java.io.BufferedReader;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpSession;

import mayo.edu.client.JsonService;
import mayo.edu.shared.XmlJsonResponse;

import org.json.XMLToJson;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;

/**
 * The server side implementation of the RPC service.
 */
@SuppressWarnings("serial")
public class JsonServiceImpl extends RemoteServiceServlet implements JsonService {

    public String getBasePath() {
        String dataPath;

        HttpSession httpSession = getThreadLocalRequest().getSession(true);
        ServletContext context = httpSession.getServletContext();

        String realContextPath = context.getRealPath(getThreadLocalRequest().getContextPath());

        if (isDevelopmentMode()) {
            dataPath = realContextPath;
        } else {
            dataPath = realContextPath + "/../";
        }

        return dataPath;
    }

    /**
      * Determine if the app is in development mode. To do this get the request
      * URL and if it contains 127.0.0.1, then it is in development mode.
      * 
      * @return
      */
    private boolean isDevelopmentMode() {
        return getThreadLocalRequest().getHeader("Referer").contains("127.0.0.1");
    }

    @Override
    public String getJsonFromXml(String xml) throws IllegalArgumentException {
        return new XMLToJson(getBasePath()).toJson(xml);
    }

    @Override
    public XmlJsonResponse getJsonFromRestService(String restUrl) throws IllegalArgumentException {

        String xml = makeRestCall(restUrl);
        String json = new XMLToJson(getBasePath()).toJson(xml);

        XmlJsonResponse response = new XmlJsonResponse();
        response.setJson(json);
        response.setXml(xml);

        return response;
    }

    /**
     * Make a REST call to retrieve XML response
     * @param endpoint
     * @return
     */
    private String makeRestCall(String endpoint) {

        HttpURLConnection request = null;
        BufferedReader rd = null;
        StringBuilder response = null;

        try {

            java.net.URL endpointUrl = new java.net.URL(endpoint);
            request = (java.net.HttpURLConnection) endpointUrl.openConnection();
            request.setRequestMethod("GET");

            rd = new java.io.BufferedReader(new java.io.InputStreamReader(request.getInputStream()));

            request.connect();

            // read the response
            response = new StringBuilder();
            String line = null;
            while ((line = rd.readLine()) != null) {
                response.append(line + '\n');
            }

            // Finally, the connection is released and the response is processed
            request.disconnect();
            rd.close();
            System.out.println((response != null) ? response.toString() : "No Response");

        } catch (MalformedURLException e) {
            System.out.println("Exception: " + e.getMessage());
            // e.printStackTrace();
        } catch (ProtocolException e) {
            System.out.println("Exception: " + e.getMessage());
            // e.printStackTrace();
        } catch (IOException e) {
            System.out.println("Exception: " + e.getMessage());
            // e.printStackTrace();
        } catch (Exception e) {
            System.out.println("Exception: " + e.getMessage());
            // e.printStackTrace();
        } finally {
            try {
                request.disconnect();
            } catch (Exception e) {
            }

            if (rd != null) {
                try {
                    rd.close();
                } catch (IOException ex) {
                }
                rd = null;
            }
        }

        return response.toString();
    }

}