com.sri.save.FloraHttpServlet.java Source code

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Here is the source code for com.sri.save.FloraHttpServlet.java

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/*
 * Copyright 2016 SRI International
 *
 * Licensed 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.sri.save;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Properties;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

public class FloraHttpServlet extends HttpServlet {

    private FloraJsonServer florajson;

    /** 
     *  
     */
    private static final long serialVersionUID = 1L;

    @Override
    public void init() throws ServletException {
        Properties properties = new Properties();
        try {
            ServletContext context = getServletContext();
            properties.load(context.getResourceAsStream("/WEB-INF/config.properties"));
        } catch (IOException e) {
            throw new ServletException("Could not open config.properties!");
        }
        String xsb = properties.getProperty("xsb");
        String floradir = properties.getProperty("flora.dir");
        String content_dir = properties.getProperty("ontology.dir"); // base dir for imported files

        // Initialize the server
        try {
            florajson = new FloraJsonServer(new File(xsb), new File(floradir), new File(content_dir));
        } catch (FloraJsonServerException ex) {
            throw new ServletException(ex);
        }
    }

    @Override
    public void destroy() {
        System.out.println("Shutting down Flora Server");
        try {
            florajson.shutdown();
        } catch (FloraJsonServerException ex) {
            ex.printStackTrace();
        }
    }

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException {
        System.out.println(request);
        PrintWriter out = response.getWriter();
        response.setContentType("application/json");
        response.setHeader("Access-Control-Allow-Origin", "*"); // allows CORS

        // Dispatch the call to the Flora JSON server
        String method = request.getParameter("method");
        if (method.equals("loadFile")) { // perhaps this should be done using POST
            String filename = request.getParameter("filename");
            try {
                florajson.loadFile(filename);
            } catch (FloraJsonServerException ex) {
                throw new ServletException(ex.getMessage());
            }
        } else if (method.equals("getTaxonomyRoots")) {
            try {
                ArrayNode result = florajson.getRootClasses();
                out.print(result.toString());
            } catch (FloraJsonServerException ex) {
                throw new ServletException(ex.getMessage());
            }
        } else if (method.equals("getSubClasses")) {
            String id = request.getParameter("id");
            try {
                ObjectNode result = florajson.getSubClasses(id);
                out.print(result.toString());
            } catch (FloraJsonServerException ex) {
                throw new ServletException(ex.getMessage());
            }
        } else if (method.equals("getClassDetails")) {
            String id = request.getParameter("id");
            try {
                ObjectNode result = florajson.getClassDetails(id);
                out.print(result.toString());
            } catch (FloraJsonServerException ex) {
                throw new ServletException(ex.getMessage());
            }
        } else if (method.equals("query")) {
            String qstring = request.getParameter("queryString");
            try {
                ObjectNode result = florajson.query(qstring);
                out.print(result.toString());
            } catch (FloraJsonServerException ex) {
                throw new ServletException(ex.getMessage());
            }
        } else
            throw new ServletException("Unrecognized method: " + method);
    }
}