aparler/RosettaCodeData
1
0
Fork 0
Code Issues 12 Pull requests 3 Projects Releases Packages Wiki Activity Actions

Data commit

Browse source
This commit is contained in:
Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
199093 changed files with 3378972 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

66
Task/Canonicalize-CIDR/Java/canonicalize-cidr.java Normal file
View file

@ -0,0 +1,66 @@
import java.text.MessageFormat;
import java.text.ParseException;
public class CanonicalizeCIDR {
public static void main(String[] args) {
for (String test : TESTS) {
try {
CIDR cidr = new CIDR(test);
System.out.printf("%-18s -> %s\n", test, cidr.toString());
} catch (Exception ex) {
System.err.printf("Error parsing '%s': %s\n", test, ex.getLocalizedMessage());
}
}
}
private static class CIDR {
private CIDR(int address, int maskLength) {
this.address = address;
this.maskLength = maskLength;
}
private CIDR(String str) throws Exception {
Object[] args = new MessageFormat(FORMAT).parse(str);
int address = 0;
for (int i = 0; i < 4; ++i) {
int a = ((Number)args[i]).intValue();
if (a < 0 || a > 255)
throw new Exception("Invalid IP address");
address <<= 8;
address += a;
}
int maskLength = ((Number)args[4]).intValue();
if (maskLength < 1 || maskLength > 32)
throw new Exception("Invalid mask length");
int mask = ~((1 << (32 - maskLength)) - 1);
this.address = address & mask;
this.maskLength = maskLength;
}
public String toString() {
int address = this.address;
int d = address & 0xFF;
address >>= 8;
int c = address & 0xFF;
address >>= 8;
int b = address & 0xFF;
address >>= 8;
int a = address & 0xFF;
Object[] args = { a, b, c, d, maskLength };
return new MessageFormat(FORMAT).format(args);
}
private int address;
private int maskLength;
private static final String FORMAT = "{0,number,integer}.{1,number,integer}.{2,number,integer}.{3,number,integer}/{4,number,integer}";
};
private static final String[] TESTS = {
"87.70.141.1/22",
"36.18.154.103/12",
"62.62.197.11/29",
"67.137.119.181/4",
"161.214.74.21/24",
"184.232.176.184/18"
};
}