org.apache.commons.net.util: public class: SubnetUtils

org.apache.commons.net.util
public class: SubnetUtils [javadoc | source]

java.lang.Object
   org.apache.commons.net.util.SubnetUtils

A class that performs some subnet calculations given a network address and a subnet mask.

Also see:

http://www.faqs.org/rfcs/rfc1519.html

author:

 - @apache.org>

since: 2.0 -










    
Nested Class Summary:
public final class   SubnetUtils.SubnetInfo   Convenience container for subnet summary information. 






    












    Constructor:
 public SubnetUtils(String cidrNotation) {
        calculate(cidrNotation);
}
Constructor that takes a CIDR-notation string, e.g. "192.168.0.1/16"
Parameters:
cidrNotation -  A CIDR-notation string, e.g. "192.168.0.1/16"
 public SubnetUtils(String address,
    String mask) {
        calculate(toCidrNotation(address, mask));
}
Constructor that takes two dotted decimal addresses.
Parameters:
address -  An IP address, e.g. "192.168.0.1"
mask -  A dotted decimal netmask e.g. "255.255.0.0"










    Method from org.apache.commons.net.util.SubnetUtils Summary:

getInfo,   pop
Methods from java.lang.Object:

clone,   equals,   finalize,   getClass,   hashCode,   notify,   notifyAll,   toString,   wait,   wait,   wait
Method from org.apache.commons.net.util.SubnetUtils Detail:
 public final SubnetInfo getInfo() {
 return new SubnetInfo();
}
Return a SubnetInfo  instance that contains subnet-specific statistics
 int pop(int x) {
        x = x - ((x  > > > 1) & 0x55555555); 
        x = (x & 0x33333333) + ((x  > > > 2) & 0x33333333); 
        x = (x + (x  > > > 4)) & 0x0F0F0F0F; 
        x = x + (x  > > > 8); 
        x = x + (x  > > > 16); 
        return x & 0x0000003F;
}