com.sri.save.florahttp.FloraHttpServlet.java Source code

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Here is the source code for com.sri.save.florahttp.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.florahttp;

import java.io.IOException;
import java.io.PrintWriter;
import java.net.URL;

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

import com.sri.save.backend.http.HttpUtil;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;

import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.sri.floralib.ext.interprolog.FlrException;
import com.sri.save.backend.FloraWrapper;

public class FloraHttpServlet extends AbstractHandler {
    private final FloraJsonServer florajson;

    public FloraHttpServlet(FloraWrapper floraWrapper, URL ontBase) throws IOException, FlrException {
        florajson = new FloraJsonServer(floraWrapper, ontBase);
    }

    @Override
    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException {
        if (request.getMethod().equals("OPTIONS")) {
            baseRequest.setHandled(true);
            HttpUtil.corsOptions(request, response, true);
            return;
        }

        baseRequest.setHandled(true);
        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 == null) {
            throw new ServletException("Missing method parameter");
        } else if (method.equals("loadFile")) { // perhaps this should be done using POST
            String filename = request.getParameter("filename");
            try {
                florajson.loadFile(filename);
                out.print("true");
            } 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);
    }
}