content: /**
   *   Copyright 2012-2019 Wicked Charts (http://github.com/adessoAG/wicked-charts)
   *
   *   Licensed under the Apache License, Version 2.0 (the "License");
   *   you may not use this file except in compliance with the License.
   *   You may obtain a copy of the License at
   *        http://www.apache.org/licenses/LICENSE-2.0
   *
   *   Unless required by applicable law or agreed to in writing, software
   *   distributed under the License is distributed on an "AS IS" BASIS,
   *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *   See the License for the specific language governing permissions and
   *   limitations under the License.
   */
  package de.adesso.wickedcharts.highcharts.options.color;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Abstract parent class for Gradient ColorReferences.
   * 
   * @author Tom Hombergs (tom.hombergs@gmail.com)
   * 
   */
  public abstract class Gradient extends ColorReference {
  
  	private static final long serialVersionUID = 1L;
  
  	private final List<List<Object>> stops = new ArrayList<List<Object>>();
  
  	public Gradient() {
  		super();
  	}
  
  	public Gradient addStop(final Number percentage, final ColorReference color) {
  		List<Object> stopList = new ArrayList<Object>();
  		stopList.add(percentage);
  		stopList.add(color);
  		this.getStops().add(stopList);
  		return this;
  	}
  
  	protected Gradient addStopsInternal(final List<List<Object>> stops) {
  		this.getStops().addAll(stops);
  		return this;
  	}
  
  	@Override
  	public ColorReference brighten(final Float brightness) {
  		Gradient copy = (Gradient) copy();
  		for (List<Object> stop : copy.stops) {
  			ColorReference color = (ColorReference) stop.get(1);
  			Float newBrightness = color.getBrightness();
  			if (newBrightness == null) {
  				newBrightness = brightness;
  			} else {
  				newBrightness += brightness;
  			}
  			color.setBrightness(newBrightness);
  		}
  		return copy;
  	}
  
  	public List<List<Object>> getStops() {
  		return this.stops;
  	}
  
  }