Conditional.java 文件源码

public Conditional(final Command ifTrue,final Command ifFalse) {
    super("Condition?" + (ifTrue  == null ? "" : ifTrue .getName()) +
                   ":" + (ifFalse == null ? "" : ifFalse.getName()));
    // Wrap the Commands to expose protected methods
    if(ifTrue != null) {
        _ifTrue  = new PublicCommand(ifTrue);
        for(Enumeration e = _ifTrue.getRequirements();e.hasMoreElements();) {
            requires((Subsystem) e.nextElement());
        }
    } else {
        _ifTrue = null;
    }
    if(ifFalse != null) {
        _ifFalse  = new PublicCommand(ifFalse);
        for(Enumeration e = _ifFalse.getRequirements();e.hasMoreElements();) {
            requires((Subsystem) e.nextElement());
        }
    } else {
        _ifFalse = null;
    }
}