/**
    * Copyright By Grandsoft Company Limited.  
    * 2012-9-26 上午10:26:16
    */
   package gboat2.attachment.watermark;
   
   /**
    * 策略工厂类 
    * @author tanxw
   * @since jdk1.6
   * @date 2012-9-26
   *  
   */
  
  public abstract class WatermarkFactory {
  	
  	/**
  	 * 打水印，尽最大努力调用多种策略使得水印打成功
  	 * @param srcImg
  	 * @param targetImg
  	 * @param watermarkImg
  	 * @throws Exception
  	 */
  	public static void watermark(String srcImg, String targetImg, String watermarkImg) throws Exception {
  		WatermarkStrategy strategy = new IM4JavaWatermarkStrategy();
  		try {
  			strategy.watermark(srcImg, targetImg, watermarkImg);
  		} catch (Throwable e) {//必须捕获Throwable类型，下层有可能抛出Error
  			strategy = new JMagickWatermarkStrategy();
  			strategy.watermark(srcImg, targetImg, watermarkImg);
  		}
  	}
  	
  }