Sean Condon | fae8e66 | 2016-12-15 10:25:13 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017-present Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.drivers.microsemi.yang.utils; |
| 17 | |
| 18 | import java.util.Arrays; |
| 19 | import java.util.Set; |
| 20 | import java.util.TreeSet; |
| 21 | |
| 22 | import org.apache.commons.lang.ArrayUtils; |
| 23 | |
| 24 | /** |
| 25 | * A set of static utilities that allow a ce-vlan-map to be decomposed. |
| 26 | * |
| 27 | * This is an implementation specific to Microsemi that encodes ce-vlan-map |
| 28 | * in a similar way to Section 7.9 in the MEF 10.2 specification. That specification |
| 29 | * suggests comma delimited lists of VIDs - this implementation adds on colons to |
| 30 | * specify a contiguous range of IDs |
| 31 | */ |
| 32 | public final class CeVlanMapUtils { |
| 33 | |
| 34 | private CeVlanMapUtils() { |
| 35 | //Do not allow this utility class to be instantiated |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * Calculate the ceVlanMap in to a Set of values. |
| 40 | * |
| 41 | * From Yang description |
| 42 | * "This object indicates the CE-VLANs associated with the specific |
| 43 | * EVC on a UNI. CE-VLAN IDs have value of 0 to 4095. The CE-VLAN ID |
| 44 | * list can be a single value or multiple values separated by a delimiter. |
| 45 | * Some valid values are: '100', '1:10', '10,20,30', '1:4095'. In the |
| 46 | * first example only CE-VLAN ID 100 is associated with the VLAN map. |
| 47 | * In the second example the CE-VLAN map includes CE-VLAN IDs 1 through |
| 48 | * 10 (range of values). The third example indicates three separate values |
| 49 | * that make up the CE-VLAN map. The last example indicates all CE-VLAN IDs |
| 50 | * are included in the map (range of values). "; |
| 51 | * reference |
| 52 | * "[MEF 6.1] 6.1; [MEF 7.2] 6.2.1.3"; |
| 53 | * @param ceVlanMap A list of vlan id's in the format described above |
| 54 | * @return A set of vlan ids |
| 55 | */ |
| 56 | public static Short[] getVlanSet(String ceVlanMap) { |
| 57 | if (ceVlanMap == null || ceVlanMap.isEmpty()) { |
| 58 | return new Short[0]; |
| 59 | } |
| 60 | Set<Short> ceVlanSet = new TreeSet<Short>(); |
| 61 | |
| 62 | String[] ceVlanMapCommas = ceVlanMap.split(","); |
| 63 | for (String ceVlanMapComma:ceVlanMapCommas) { |
| 64 | String[] ceVlanMapColon = ceVlanMapComma.split(":"); |
| 65 | if (ceVlanMapColon.length == 1) { |
| 66 | ceVlanSet.add(Short.decode(ceVlanMapColon[0])); |
| 67 | } else { |
| 68 | short start = Short.decode(ceVlanMapColon[0]); |
| 69 | short end = Short.decode(ceVlanMapColon[1]); |
| 70 | if ((start < 0 || end > 4095)) { |
| 71 | return null; |
| 72 | } else { |
| 73 | for (short i = start; i <= end; i++) { |
| 74 | ceVlanSet.add(i); |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | return ceVlanSet.toArray(new Short[ceVlanSet.size()]); |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Convert an array of vlan ids in to a string representation. |
| 85 | * @param vlanArray An array of vlan ids |
| 86 | * @return A string representation delimited by commas and colons |
| 87 | */ |
| 88 | public static String vlanListAsString(Short[] vlanArray) { |
| 89 | boolean colonPending = false; |
| 90 | StringBuilder ceVlanMapBuilder = new StringBuilder(); |
| 91 | if (vlanArray.length == 0) { |
| 92 | return ""; |
| 93 | } else if (vlanArray.length == 1 && vlanArray[0] == 0) { |
| 94 | return "0"; |
| 95 | } |
| 96 | |
| 97 | //To ensure that there are no repeated or out-of-order elements we must convert to TreeSet |
| 98 | TreeSet<Short> vlanSet = new TreeSet<>(Arrays.asList(vlanArray)); |
| 99 | |
| 100 | if (vlanSet.first() == 0) { |
| 101 | vlanSet.remove(vlanSet.first()); |
| 102 | } |
| 103 | short prev = vlanSet.first(); |
| 104 | for (short s:vlanSet) { |
| 105 | if (s == prev) { |
| 106 | ceVlanMapBuilder.append(Short.valueOf(s)); |
| 107 | continue; |
| 108 | } else if (prev == (s - 1)) { |
| 109 | colonPending = true; |
| 110 | } else { |
| 111 | if (colonPending) { |
| 112 | ceVlanMapBuilder.append(":" + Short.valueOf(prev)); |
| 113 | colonPending = false; |
| 114 | } |
| 115 | ceVlanMapBuilder.append("," + Short.valueOf(s)); |
| 116 | } |
| 117 | prev = s; |
| 118 | } |
| 119 | if (colonPending) { |
| 120 | ceVlanMapBuilder.append(":" + Short.valueOf(prev)); |
| 121 | } |
| 122 | |
| 123 | return ceVlanMapBuilder.toString(); |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * Add an additional vlan id to an existing string representation. |
| 128 | * @param existingMap An array of vlan ids |
| 129 | * @param newVlan The new vlan ID to add |
| 130 | * @return A string representation delimited by commas and colons |
| 131 | */ |
| 132 | public static String addtoCeVlanMap(String existingMap, Short newVlan) { |
| 133 | Short[] vlanArray = getVlanSet(existingMap); |
| 134 | TreeSet<Short> vlanSet = new TreeSet<>(); |
| 135 | for (Short vlan:vlanArray) { |
| 136 | vlanSet.add(vlan); |
| 137 | } |
| 138 | |
| 139 | vlanSet.add(newVlan); |
| 140 | |
| 141 | return vlanListAsString(vlanSet.toArray(new Short[vlanSet.size()])); |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * If a string representation contains a '0' then remove it. |
| 146 | * |
| 147 | * Zero is an invalid VLAN id, and is used here as a place holder for null. Null can't |
| 148 | * be used in the EA1000 device. Once any other vlan ids are added then the zero should |
| 149 | * be removed. It is safe to call this method even if no zero is present - the method will |
| 150 | * make no change in that case. |
| 151 | * |
| 152 | * @param existingMap An string representation of vlan ids, possibly containing a zero |
| 153 | * @return A string representation delimited by commas and colons without zero |
| 154 | */ |
| 155 | public static String removeZeroIfPossible(String existingMap) { |
| 156 | if (existingMap == null || existingMap.isEmpty()) { |
| 157 | return "0"; |
| 158 | } else if (existingMap == "0") { |
| 159 | return existingMap; |
| 160 | } |
| 161 | return removeFromCeVlanMap(existingMap, (short) 0); |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * Remove a vlan id from an existing string representation. |
| 166 | * @param existingMap An array of vlan ids |
| 167 | * @param vlanRemove The vlan ID to remove |
| 168 | * @return A string representation delimited by commas and colons |
| 169 | */ |
| 170 | public static String removeFromCeVlanMap(String existingMap, Short vlanRemove) { |
| 171 | Short[] vlanArray = getVlanSet(existingMap); |
| 172 | TreeSet<Short> vlanSet = new TreeSet<>(); |
| 173 | for (Short vlan:vlanArray) { |
| 174 | if (vlan.shortValue() != vlanRemove.shortValue()) { |
| 175 | vlanSet.add(vlan); |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | return vlanListAsString(vlanSet.toArray(new Short[vlanSet.size()])); |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * Combine vlan ids from two existing string representations. |
| 184 | * |
| 185 | * If there are overlapping elements and ranges, these are consolidated in to one. |
| 186 | * |
| 187 | * @param set1 A string containing a set of vlan ids |
| 188 | * @param set2 A string containing a set of vlan ids |
| 189 | * @return A string representation delimited by commas and colons |
| 190 | */ |
| 191 | public static String combineVlanSets(String set1, String set2) { |
| 192 | Short[] set1Array = getVlanSet(set1); |
| 193 | Short[] set2Array = getVlanSet(set2); |
| 194 | return vlanListAsString((Short[]) ArrayUtils.addAll(set1Array, set2Array)); |
| 195 | } |
| 196 | } |