import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class ResourceApi {

    public String getFileFromResourceAsString(String fileName) throws IOException {
        InputStream inputStream = getFileFromResourceAsStream(fileName);
        return getStringFromInputStream(inputStream);
    }

    public InputStream getFileFromResourceAsStream(String fileName) {
        //ClassLoader classLoader = getClass().getClassLoader();
        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        InputStream inputStream = classLoader.getResourceAsStream(fileName);

        if (inputStream == null) {
            throw new IllegalArgumentException("file not found! " + fileName);
        } else {
            return inputStream;
        }
    }

    public String getStringFromInputStream(InputStream inputStream) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(inputStream));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine + "\n");
        }
        in.close();

        return response.toString();
    }
}