| /* |
| * Copyright 2017-present Open Networking Foundation |
| * |
| * 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.onosproject.routeservice; |
| |
| import org.onlab.packet.IpPrefix; |
| |
| /** |
| * Routing tools. |
| */ |
| public final class RouteTools { |
| |
| private RouteTools() { |
| } |
| |
| /** |
| * Creates a binary string representation of an IP prefix. |
| * |
| * For each string, we put a extra "0" in the front. The purpose of |
| * doing this is to store the default route inside InvertedRadixTree. |
| * |
| * @param ipPrefix the IP prefix to use |
| * @return the binary string representation |
| */ |
| public static String createBinaryString(IpPrefix ipPrefix) { |
| byte[] octets = ipPrefix.address().toOctets(); |
| StringBuilder result = new StringBuilder(ipPrefix.prefixLength()); |
| result.append("0"); |
| for (int i = 0; i < ipPrefix.prefixLength(); i++) { |
| int byteOffset = i / Byte.SIZE; |
| int bitOffset = i % Byte.SIZE; |
| int mask = 1 << (Byte.SIZE - 1 - bitOffset); |
| byte value = octets[byteOffset]; |
| boolean isSet = ((value & mask) != 0); |
| result.append(isSet ? "1" : "0"); |
| } |
| return result.toString(); |
| } |
| } |