class PowerShellVmsResource {

    enum Method { GET, ADD };

    enum Detail {
        DISKS("$_.getmemorystatistics(); $_.getcpustatistics(); "),
        STATISTICS("$_.getdiskimages(); ");

        public final String powershell;

        Detail(String powershell) {
            this.powershell = powershell;
        }
    }

    static String getProcess(Method method, Set<Detail> details) {
        StringBuilder buf = new StringBuilder();
        if (details != null) {
            for (Detail detail : details) {
                buf.append(detail.powershell);
            }
        }
        return MessageFormat.format(PROCESS_VMS, method == Method.ADD ? " " : "$_; ", buf);
    }

    private String getProcess(Method method) {
        return getProcess(method, getDetails());
    }

    private Set<Detail> getDetails() {
        Set<Detail> details = new EnumSet<Detail>();
        for (Detail detail : Detail.class.getEnumConstants()) {
            if (include(getHttpHeaders(), detail.name().toLowerCase())) {
                details.add(detail);
            }
        }
        return details;
    }
}