ScanRange.java

package io.evercam.network.discovery;

public class ScanRange {
    private long routerIp;
    private String routerIpString;
    private long scanStart;
    private long scanEnd;
    private int cidr;

    public ScanRange(String routerIp, String subnetMask) throws Exception {
	this.routerIp = IpTranslator.getUnsignedLongFromIp(routerIp);
	this.routerIpString = routerIp;

	cidr = IpTranslator.maskIpToCidr(subnetMask);
	setUpStartAndEnd(cidr);
    }

    // TODO: Temporary disabled this because get cidr from interface is not
    // working sometimes
    // public ScanRange(NetworkInterface networkInterface) throws Exception
    // {
    // scanIp = IpTranslator.getUnsignedLongFromIp(NetworkInfo
    // .getIpFromInterface(networkInterface));
    // int cidr = NetworkInfo.getCidrFromInterface(networkInterface);
    // setUpStartAndEnd(cidr);
    // }

    private void setUpStartAndEnd(int cidr) {
	int shift = (32 - cidr);
	if (cidr < 31) {
	    scanStart = (routerIp >> shift << shift) + 1;
	    scanEnd = (scanStart | ((1 << shift) - 1)) - 1;
	} else {
	    scanStart = (routerIp >> shift << shift);
	    scanEnd = (scanStart | ((1 << shift) - 1));
	}
    }

    /**
     * @return true if the given IP is in this scan range
     */
    public boolean containIp(String ip) throws Exception {
	int shift = (32 - cidr);
	long ipLong = IpTranslator.getUnsignedLongFromIp(ip);
	return scanStart == ((ipLong >> shift << shift) + 1);
    }

    public int size() {
	return (int) (scanEnd - scanStart + 1);
    }

    protected long getRouterIp() {
	return routerIp;
    }

    public String getRouterIpString() {
	return routerIpString;
    }

    protected long getScanStart() {
	return scanStart;
    }

    protected long getScanEnd() {
	return scanEnd;
    }

    protected void setScanIp(long scanIp) {
	this.routerIp = scanIp;
    }

    protected void setScanStart(long scanStart) {
	this.scanStart = scanStart;
    }

    protected void setScanEnd(long scanEnd) {
	this.scanEnd = scanEnd;
    }

}