PortMixer.java 文件源码

void implOpen() throws LineUnavailableException {
    if (Printer.trace) Printer.trace(">> PortMixerPort: implOpen().");
    long newID = ((PortMixer) mixer).getID();
    if ((id == 0) || (newID != id) || (controls.length == 0)) {
        id = newID;
        Vector<Control> vector = new Vector<>();
        synchronized (vector) {
            nGetControls(id, portIndex, vector);
            controls = new Control[vector.size()];
            for (int i = 0; i < controls.length; i++) {
                controls[i] = vector.elementAt(i);
            }
        }
    } else {
        enableControls(controls, true);
    }
    if (Printer.trace) Printer.trace("<< PortMixerPort: implOpen() succeeded");
}