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/*
* Copyright 2014-2015 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onlab.packet;
/**
* The class representing an IPv4 network address.
* This class is immutable.
*/
public final class Ip4Prefix extends IpPrefix {
public static final IpAddress.Version VERSION = IpAddress.Version.INET;
// Maximum network mask length
public static final int MAX_MASK_LENGTH = IpPrefix.MAX_INET_MASK_LENGTH;
/**
* Constructor for given IPv4 address, and a prefix length.
*
* @param address the IPv4 address
* @param prefixLength the prefix length
* @throws IllegalArgumentException if the prefix length value is invalid
*/
private Ip4Prefix(Ip4Address address, int prefixLength) {
super(address, prefixLength);
}
/**
* Returns the IPv4 address value of the prefix.
*
* @return the IPv4 address value of the prefix
*/
public Ip4Address address() {
IpAddress a = super.address();
return (Ip4Address) a;
}
/**
* Converts an integer and a prefix length into an IPv4 prefix.
*
* @param address an integer representing the IPv4 address
* @param prefixLength the prefix length
* @return an IPv4 prefix
* @throws IllegalArgumentException if the prefix length value is invalid
*/
public static Ip4Prefix valueOf(int address, int prefixLength) {
return new Ip4Prefix(Ip4Address.valueOf(address), prefixLength);
}
/**
* Converts a byte array and a prefix length into an IPv4 prefix.
*
* @param address the IPv4 address value stored in network byte order
* @param prefixLength the prefix length
* @return an IPv4 prefix
* @throws IllegalArgumentException if the prefix length value is invalid
*/
public static Ip4Prefix valueOf(byte[] address, int prefixLength) {
return new Ip4Prefix(Ip4Address.valueOf(address), prefixLength);
}
/**
* Converts an IPv4 address and a prefix length into an IPv4 prefix.
*
* @param address the IPv4 address
* @param prefixLength the prefix length
* @return an IPv4 prefix
* @throws IllegalArgumentException if the prefix length value is invalid
*/
public static Ip4Prefix valueOf(Ip4Address address, int prefixLength) {
return new Ip4Prefix(address, prefixLength);
}
/**
* Converts a CIDR (slash) notation string (e.g., "10.1.0.0/16")
* into an IPv4 prefix.
*
* @param address an IP prefix in string form (e.g., "10.1.0.0/16")
* @return an IPv4 prefix
* @throws IllegalArgumentException if the arguments are invalid
*/
public static Ip4Prefix valueOf(String address) {
final String[] parts = address.split("/");
if (parts.length != 2) {
String msg = "Malformed IPv4 prefix string: " + address + ". " +
"Address must take form \"x.x.x.x/y\"";
throw new IllegalArgumentException(msg);
}
Ip4Address ipAddress = Ip4Address.valueOf(parts[0]);
int prefixLength = Integer.parseInt(parts[1]);
return new Ip4Prefix(ipAddress, prefixLength);
}
}
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