Grand Exchange Price Class

package com.reiddacosta.ge;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;

/**
 * GrandExchange Price Class
 *
 * @author Reid
 *
 */
public class GrandExchange {

    private static final String BASE = "https://api.rsbuddy.com/grandExchange?a=guidePrice&i=";
    private String choice;

    /**
     * Default Constructor
     *
     */
    public GrandExchange() {

    }

    /**
     * Gets the overall price of an item.
     *
     * @param itemID
     * @return itemPrice
     * @throws IOException
     */
    public int getOverallPrice(final int itemID) throws IOException {
        choice = "overall";
        return parse(itemID);
    }


    /**
     * Gets the buying price of an item.
     *
     * @param itemID
     * @return itemPrice
     * @throws IOException
     */
    public int getBuyingPrice(final int itemID) throws IOException {
        choice = "buying";
        return parse(itemID);
    }

    /**
     * Gets the selling price of an item.
     *
     * @param itemID
     * @return itemPrice
     * @throws IOException
     */
    public int getSellingPrice(final int itemID) throws IOException {
        choice = "selling";
        return parse(itemID);
    }


    /**
     * Retrieves the price of an item.
     *
     * @param itemID
     * @return itemPrice
     * @throws IOException
     */
    private int parse(final int itemID) throws IOException {
        final URL url = new URL(BASE + itemID);
        BufferedReader file = new BufferedReader(new InputStreamReader(url.openStream()));
        String line;
        String price = null;
        while ((line = file.readLine()) != null) {
            if (line.contains("{")) {
                price = (line).trim();
            }
        }
        if (choice.equals("buying")){
            price = price.substring(price.indexOf(",") + 11, price.lastIndexOf(",") - 1).trim();
        } else if(choice.equals("selling")) {
            price = price.substring(price.lastIndexOf(",") + 12, price.indexOf("}") - 1).trim();
        } else {
            price = price.substring(price.indexOf("{") + 12, price.indexOf(",") - 1).trim();
        }
        file.close();
        return Integer.parseInt(price);
    }
}