ca.drusk.investment_tracker.data_retrieval.HistoricalDataServlet.java Source code

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Here is the source code for ca.drusk.investment_tracker.data_retrieval.HistoricalDataServlet.java

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/******************************************************************************
 * Copyright (C) 2012 David Rusk
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *****************************************************************************/
package ca.drusk.investment_tracker.data_retrieval;

import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.Type;
import java.text.ParseException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

/**
 * Servlet implementation class HistoricalDataLookup
 * 
 * Retrieves historical data for a specified symbol.
 * 
 * @author drusk
 * 
 */
@WebServlet("/HistoricalData")
public class HistoricalDataServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    private YahooHistoricalDataFetcher dataFetcher = new YahooHistoricalDataFetcher();

    private Gson gson = new Gson();

    /**
     * @see HttpServlet#HttpServlet()
     */
    public HistoricalDataServlet() {
        super();
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String queriedSymbol = request.getParameter("symbol");
        assert queriedSymbol != null : "query symbol was null!";

        response.setContentType("application/json");

        try {
            List<YahooDataBean> beans = dataFetcher.fetchDataForSymbol(queriedSymbol);
            Type type = new TypeToken<List<YahooDataBean>>() {
            }.getType();
            PrintWriter out = response.getWriter();
            out.write(gson.toJson(beans, type));

        } catch (ParseException e) {
            e.printStackTrace();
            // TODO return an error code
        }
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        /* Does nothing */
    }

}