HIGUCHI Yuta | ea60e5f | 2013-06-12 11:10:21 -0700 | [diff] [blame] | 1 | package net.onrc.onos.ofcontroller.bgproute; |
pingping-lin | a2cbfad | 2013-03-07 08:39:21 +0800 | [diff] [blame] | 2 | |
| 3 | import java.net.InetAddress; |
| 4 | import java.net.UnknownHostException; |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 5 | import java.util.Arrays; |
pingping-lin | a2cbfad | 2013-03-07 08:39:21 +0800 | [diff] [blame] | 6 | |
| 7 | public class Prefix { |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 8 | private final int MAX_BYTES = 4; |
| 9 | |
| 10 | private final int prefixLength; |
| 11 | private final byte[] address; |
| 12 | |
| 13 | //For verifying the arguments and pretty printing |
| 14 | private final InetAddress inetAddress; |
| 15 | |
| 16 | public Prefix(byte[] addr, int prefixLength) { |
| 17 | if (addr == null || addr.length != MAX_BYTES || |
| 18 | prefixLength < 0 || prefixLength > MAX_BYTES * Byte.SIZE) { |
| 19 | throw new IllegalArgumentException(); |
| 20 | } |
pingping-lin | a2cbfad | 2013-03-07 08:39:21 +0800 | [diff] [blame] | 21 | |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 22 | address = canonicalizeAddress(addr, prefixLength); |
Jonathan Hart | d1b9d87 | 2013-07-23 12:17:21 +1200 | [diff] [blame] | 23 | this.prefixLength = prefixLength; |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 24 | |
| 25 | try { |
| 26 | inetAddress = InetAddress.getByAddress(address); |
| 27 | } catch (UnknownHostException e) { |
| 28 | throw new IllegalArgumentException(); |
| 29 | } |
pingping-lin | a2cbfad | 2013-03-07 08:39:21 +0800 | [diff] [blame] | 30 | } |
Jonathan Hart | 61ba937 | 2013-05-19 20:10:29 -0700 | [diff] [blame] | 31 | |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 32 | public Prefix(String strAddress, int prefixLength) { |
| 33 | byte[] addr = null; |
| 34 | try { |
| 35 | addr = InetAddress.getByName(strAddress).getAddress(); |
| 36 | } catch (UnknownHostException e) { |
| 37 | throw new IllegalArgumentException("Invalid IP inetAddress argument"); |
| 38 | } |
| 39 | |
| 40 | if (addr == null || addr.length != MAX_BYTES || |
| 41 | prefixLength < 0 || prefixLength > MAX_BYTES * Byte.SIZE) { |
| 42 | throw new IllegalArgumentException(); |
| 43 | } |
| 44 | |
| 45 | address = canonicalizeAddress(addr, prefixLength); |
Jonathan Hart | d1b9d87 | 2013-07-23 12:17:21 +1200 | [diff] [blame] | 46 | this.prefixLength = prefixLength; |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 47 | |
| 48 | try { |
| 49 | inetAddress = InetAddress.getByAddress(address); |
| 50 | } catch (UnknownHostException e) { |
| 51 | throw new IllegalArgumentException(); |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | private byte[] canonicalizeAddress(byte[] address, int prefixLength) { |
| 56 | byte[] result = new byte[address.length]; |
| 57 | |
| 58 | if (prefixLength == 0) { |
| 59 | for (int i = 0; i < MAX_BYTES; i++) { |
| 60 | result[i] = 0; |
| 61 | } |
| 62 | |
| 63 | return result; |
| 64 | } |
| 65 | |
| 66 | result = Arrays.copyOf(address, address.length); |
| 67 | |
| 68 | //Set all bytes after the end of the prefix to 0 |
| 69 | int lastByteIndex = (prefixLength - 1) / Byte.SIZE; |
| 70 | for (int i = lastByteIndex; i < MAX_BYTES; i++) { |
| 71 | result[i] = 0; |
| 72 | } |
| 73 | |
| 74 | byte lastByte = address[lastByteIndex]; |
| 75 | byte mask = 0; |
Jonathan Hart | 9ea3121 | 2013-08-12 21:40:34 +1200 | [diff] [blame] | 76 | byte msb = (byte) 0x80; |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 77 | int lastBit = (prefixLength - 1) % Byte.SIZE; |
| 78 | for (int i = 0; i < Byte.SIZE; i++) { |
Jonathan Hart | 9ea3121 | 2013-08-12 21:40:34 +1200 | [diff] [blame] | 79 | if (i <= lastBit) { |
| 80 | mask |= (msb >> i); |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 81 | } |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | result[lastByteIndex] = (byte) (lastByte & mask); |
| 85 | |
| 86 | return result; |
pingping-lin | a2cbfad | 2013-03-07 08:39:21 +0800 | [diff] [blame] | 87 | } |
Jonathan Hart | 61ba937 | 2013-05-19 20:10:29 -0700 | [diff] [blame] | 88 | |
Jonathan Hart | d1b9d87 | 2013-07-23 12:17:21 +1200 | [diff] [blame] | 89 | public int getPrefixLength() { |
| 90 | return prefixLength; |
| 91 | } |
| 92 | |
| 93 | public byte[] getAddress() { |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 94 | return address; |
pingping-lin | a2cbfad | 2013-03-07 08:39:21 +0800 | [diff] [blame] | 95 | } |
Jonathan Hart | d1b9d87 | 2013-07-23 12:17:21 +1200 | [diff] [blame] | 96 | |
| 97 | @Override |
Jonathan Hart | 0ee0f02 | 2013-08-03 22:21:54 +1200 | [diff] [blame] | 98 | public boolean equals(Object other) { |
| 99 | if (other == null || !(other instanceof Prefix)) { |
| 100 | return false; |
| 101 | } |
| 102 | |
| 103 | Prefix otherPrefix = (Prefix) other; |
| 104 | |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 105 | return (Arrays.equals(address, otherPrefix.address)) && |
Jonathan Hart | 0ee0f02 | 2013-08-03 22:21:54 +1200 | [diff] [blame] | 106 | (prefixLength == otherPrefix.prefixLength); |
| 107 | } |
| 108 | |
| 109 | @Override |
| 110 | public int hashCode() { |
| 111 | int hash = 17; |
| 112 | hash = 31 * hash + prefixLength; |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 113 | hash = 31 * hash + Arrays.hashCode(address); |
Jonathan Hart | 0ee0f02 | 2013-08-03 22:21:54 +1200 | [diff] [blame] | 114 | return hash; |
| 115 | } |
| 116 | |
| 117 | @Override |
Jonathan Hart | d1b9d87 | 2013-07-23 12:17:21 +1200 | [diff] [blame] | 118 | public String toString() { |
Jonathan Hart | 32e1822 | 2013-08-07 22:05:42 +1200 | [diff] [blame] | 119 | return inetAddress.getHostAddress() + "/" + prefixLength; |
| 120 | } |
| 121 | |
| 122 | public String printAsBits() { |
| 123 | String result = ""; |
| 124 | for (int i = 0; i < address.length; i++) { |
| 125 | byte b = address[i]; |
| 126 | for (int j = 0; j < Byte.SIZE; j++) { |
| 127 | byte mask = (byte) (0x80 >>> j); |
| 128 | result += ((b & mask) == 0)? "0" : "1"; |
| 129 | if (i*Byte.SIZE+j == prefixLength-1) { |
| 130 | return result; |
| 131 | } |
| 132 | } |
| 133 | result += " "; |
| 134 | } |
| 135 | return result.substring(0, result.length() - 1); |
Jonathan Hart | d1b9d87 | 2013-07-23 12:17:21 +1200 | [diff] [blame] | 136 | } |
pingping-lin | a2cbfad | 2013-03-07 08:39:21 +0800 | [diff] [blame] | 137 | } |