LineControlGroup.java 文件源码

public LineControlGroup(final Line underlying) throws LineUnavailableException, Exception
{
    if (!underlying.isOpen())
        underlying.open();

    final FloatControl volumeInput=(FloatControl)new ControlLocator(FloatControl.Type.VOLUME).find(underlying);
    if (volumeInput==null)
        throw new Exception("Could not find volume control for line \""+underlying.getLineInfo().toString()+"\".");
    volume=new FloatControlAdapter(volumeInput);

    final StringBuilder log=new StringBuilder();
    if (logger.isDebugEnabled())
    {
        log.append("Instantiated for line \"");
        log.append(underlying.getLineInfo().toString());
        log.append("\". ");
    }

    final BooleanControl muteInput=(BooleanControl)new ControlLocator(BooleanControl.Type.MUTE).find(underlying);
    if (muteInput==null)
    {
        mute=null;
        if (logger.isDebugEnabled())
            log.append("Found volume control but no mute control.");
    }
    else
    {
        mute=new BooleanControlAdapter(muteInput);
        if (logger.isDebugEnabled())
            log.append("Found volume and mute controls.");
    }
    logger.debug(log.toString());
}