com.Assignment4.Assign.java Source code

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Here is the source code for com.Assignment4.Assign.java

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/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.Assignment4;

import java.io.StringReader;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.json.Json;
import javax.json.stream.JsonParser;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.UriInfo;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import static javax.ws.rs.HttpMethod.POST;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PUT;
import javax.ws.rs.core.MediaType;
import org.json.simple.JSONArray;

/**
 * REST Web Service
 *
 * @author Pratha JAin
 */
@Path("products")
public class Assign {
    Dataconnection dataconn = new Dataconnection();
    Connection connected = null;
    @Context
    private UriInfo context;

    /**
     * Creates a new instance of ProductResource
     */
    public Assign() {
        connected = dataconn.getConnection();
    }

    /**
     * Retrieves representation of an instance of com.oracle.products.ProductResource
     * @return an instance of java.lang.String
     */
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public String getAllProducts() throws SQLException {
        if (connected == null) {
            return "not connected";
        } else {
            String query = "Select * from product";
            PreparedStatement ps = connected.prepareStatement(query);
            ResultSet rs = ps.executeQuery();
            String res = "";
            JSONArray productArr = new JSONArray();
            while (rs.next()) {
                Map proMap = new LinkedHashMap();
                proMap.put("productID", rs.getInt("product_id"));
                proMap.put("name", rs.getString("name"));
                proMap.put("description", rs.getString("description"));
                proMap.put("quantity", rs.getInt("quantity"));
                productArr.add(proMap);
            }
            res = productArr.toString();
            return res.replace("},", "},\n");
        }

    }

    @GET
    @Path("{id}")
    @Produces(MediaType.APPLICATION_JSON)
    public String getproduct(@PathParam("id") int id) throws SQLException {

        if (connected == null) {
            return "not connected";
        } else {
            String query = "Select * from product where product_id = ?";
            PreparedStatement pstmt = connected.prepareStatement(query);
            pstmt.setInt(1, id);
            ResultSet rs = pstmt.executeQuery();
            String res = "";
            JSONArray productArr = new JSONArray();
            while (rs.next()) {
                Map proMap = new LinkedHashMap();
                proMap.put("productID", rs.getInt("product_id"));
                proMap.put("name", rs.getString("name"));
                proMap.put("description", rs.getString("description"));
                proMap.put("quantity", rs.getInt("quantity"));
                productArr.add(proMap);
            }
            res = productArr.toString();

            return res;
        }

    }

    @POST
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.TEXT_PLAIN)
    public String postProduct(String str) throws SQLException {
        JsonParser parser = Json.createParser(new StringReader(str));
        Map<String, String> proMap = new LinkedHashMap<String, String>();
        String key = "";
        String val = "";

        while (parser.hasNext()) {
            JsonParser.Event event = parser.next();
            switch (event) {
            case KEY_NAME:
                key = parser.getString();
                break;
            case VALUE_STRING:
                val = parser.getString();
                proMap.put(key, val);
                break;
            case VALUE_NUMBER:
                val = parser.getString();
                proMap.put(key, val);
                break;
            default:
                break;
            }
        }
        if (connected == null) {
            return "Not connected";
        } else {
            String query = "INSERT INTO product (product_id,name,description,quantity) VALUES (?,?,?,?)";
            PreparedStatement pst = connected.prepareStatement(query);
            pst.setInt(1, Integer.parseInt(proMap.get("product_id")));
            pst.setString(2, proMap.get("name"));
            pst.setString(3, proMap.get("description"));
            pst.setInt(4, Integer.parseInt(proMap.get("quantity")));
            pst.executeUpdate();
            return "row has been inserted into the database";
        }

    }

    @PUT
    @Path("{id}")
    @Consumes(MediaType.APPLICATION_JSON)
    public String putProduct(@PathParam("id") int id, String str) throws SQLException {
        JsonParser parser = Json.createParser(new StringReader(str));
        Map<String, String> proMap = new LinkedHashMap<>();
        String key = "";
        String val = "";

        while (parser.hasNext()) {
            JsonParser.Event event = parser.next();
            switch (event) {
            case KEY_NAME:
                key = parser.getString();
                break;
            case VALUE_STRING:
                val = parser.getString();
                proMap.put(key, val);
                break;
            case VALUE_NUMBER:
                val = parser.getString();
                proMap.put(key, val);
                break;
            default:
                break;
            }
        }
        if (connected == null) {
            return "Not connected";
        } else {
            String query = "UPDATE product SET  name = ?, description = ?, quantity = ? WHERE product_id =?";
            PreparedStatement pstmt = connected.prepareStatement(query);
            pstmt.setString(1, proMap.get("name"));
            pstmt.setString(2, proMap.get("description"));
            pstmt.setInt(3, Integer.parseInt(proMap.get("quantity")));
            pstmt.setInt(4, id);
            pstmt.executeUpdate();
            return "row has been updated into the database";
        }

    }

    @DELETE
    @Path("{id}")
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.TEXT_PLAIN)
    public String deleteProduct(@PathParam("id") int id) throws SQLException {

        if (connected == null) {
            return "not connected";
        } else {
            String query = "DELETE FROM product WHERE product_id = ?";
            PreparedStatement pstmt = connected.prepareStatement(query);
            pstmt.setInt(1, id);
            pstmt.executeUpdate();
            return "The specified row is deleted";

        }

    }
}