AbstractChartController.java

/*
 This file is part of Libresonic.

 Libresonic is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 Libresonic is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with Libresonic.  If not, see <http://www.gnu.org/licenses/>.

 Copyright 2016 (C) Libresonic Authors
 Based upon Subsonic, Copyright 2009 (C) Sindre Mehus
 */
package org.libresonic.player.controller;

import org.springframework.ui.context.Theme;
import org.springframework.web.servlet.support.RequestContextUtils;

import javax.servlet.http.HttpServletRequest;

import java.awt.*;
import java.util.Locale;

/**
 * Abstract super class for controllers which generate charts.
 *
 * @author Sindre Mehus
 */
public abstract class AbstractChartController {

    /**
     * Returns the chart background color for the current theme.
     * @param request The servlet request.
     * @return The chart background color.
     */
    protected Color getBackground(HttpServletRequest request) {
        return getColor("backgroundColor", request);
    }

    /**
     * Returns the chart foreground color for the current theme.
     * @param request The servlet request.
     * @return The chart foreground color.
     */
    protected Color getForeground(HttpServletRequest request) {
        return getColor("textColor", request);
    }

    private Color getColor(String code, HttpServletRequest request) {
        Theme theme = RequestContextUtils.getTheme(request);
        Locale locale = RequestContextUtils.getLocale(request);
        String colorHex = theme.getMessageSource().getMessage(code, new Object[0], locale);
        return new Color(Integer.parseInt(colorHex, 16));
    }
}