Xin Jin | 313708b | 2015-07-09 13:43:04 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 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.net.flowobjective.impl.composition; |
| 17 | |
| 18 | import org.onlab.packet.IpPrefix; |
| 19 | import org.onosproject.net.flow.DefaultTrafficSelector; |
| 20 | import org.onosproject.net.flow.DefaultTrafficTreatment; |
| 21 | import org.onosproject.net.flow.TrafficSelector; |
| 22 | import org.onosproject.net.flow.TrafficTreatment; |
| 23 | import org.onosproject.net.flow.criteria.Criterion; |
Xin Jin | 313708b | 2015-07-09 13:43:04 -0700 | [diff] [blame] | 24 | import org.onosproject.net.flow.criteria.OchSignalCriterion; |
| 25 | import org.onosproject.net.flow.criteria.EthCriterion; |
| 26 | import org.onosproject.net.flow.criteria.VlanIdCriterion; |
| 27 | import org.onosproject.net.flow.criteria.VlanPcpCriterion; |
| 28 | import org.onosproject.net.flow.criteria.MplsCriterion; |
| 29 | import org.onosproject.net.flow.criteria.IPCriterion; |
HIGUCHI Yuta | d275afd | 2015-09-09 09:57:34 +0900 | [diff] [blame] | 30 | import org.onosproject.net.flow.criteria.IPv6FlowLabelCriterion; |
Yafit Hadar | 5796d97 | 2015-10-15 13:16:11 +0300 | [diff] [blame] | 31 | import org.onosproject.net.flow.criteria.OduSignalIdCriterion; |
Xin Jin | 313708b | 2015-07-09 13:43:04 -0700 | [diff] [blame] | 32 | import org.onosproject.net.flow.criteria.Criteria; |
| 33 | import org.onosproject.net.flow.instructions.Instruction; |
| 34 | import org.onosproject.net.flow.instructions.L0ModificationInstruction; |
Yafit Hadar | 5796d97 | 2015-10-15 13:16:11 +0300 | [diff] [blame] | 35 | import org.onosproject.net.flow.instructions.L1ModificationInstruction; |
Xin Jin | 313708b | 2015-07-09 13:43:04 -0700 | [diff] [blame] | 36 | import org.onosproject.net.flow.instructions.L2ModificationInstruction; |
| 37 | import org.onosproject.net.flow.instructions.L3ModificationInstruction; |
| 38 | import org.onosproject.net.flowobjective.DefaultForwardingObjective; |
| 39 | import org.onosproject.net.flowobjective.ForwardingObjective; |
| 40 | |
| 41 | import java.util.ArrayList; |
| 42 | import java.util.Collection; |
| 43 | import java.util.HashMap; |
| 44 | import java.util.HashSet; |
| 45 | import java.util.List; |
| 46 | import java.util.Map; |
| 47 | import java.util.Set; |
| 48 | import java.util.Stack; |
| 49 | |
| 50 | /** |
| 51 | * Provide util functions for FlowObjectiveComposition. |
| 52 | */ |
| 53 | public final class FlowObjectiveCompositionUtil { |
| 54 | |
| 55 | private FlowObjectiveCompositionUtil() {} |
| 56 | |
| 57 | // only work with VERSATILE |
| 58 | public static ForwardingObjective composeParallel(ForwardingObjective fo1, ForwardingObjective fo2) { |
| 59 | |
| 60 | TrafficSelector trafficSelector = intersectTrafficSelector(fo1.selector(), fo2.selector()); |
| 61 | if (trafficSelector == null) { |
| 62 | return null; |
| 63 | } |
| 64 | |
| 65 | TrafficTreatment trafficTreatment = unionTrafficTreatment(fo1.treatment(), fo2.treatment()); |
| 66 | |
| 67 | return DefaultForwardingObjective.builder() |
| 68 | .fromApp(fo1.appId()) |
| 69 | .makePermanent() |
| 70 | .withFlag(ForwardingObjective.Flag.VERSATILE) |
| 71 | .withPriority(fo1.priority() + fo2.priority()) |
| 72 | .withSelector(trafficSelector) |
| 73 | .withTreatment(trafficTreatment) |
| 74 | .add(); |
| 75 | } |
| 76 | |
| 77 | public static ForwardingObjective composeSequential(ForwardingObjective fo1, |
| 78 | ForwardingObjective fo2, |
| 79 | int priorityMultiplier) { |
| 80 | |
| 81 | TrafficSelector revertTrafficSelector = revertTreatmentSelector(fo1.treatment(), fo2.selector()); |
| 82 | if (revertTrafficSelector == null) { |
| 83 | return null; |
| 84 | } |
| 85 | |
| 86 | TrafficSelector trafficSelector = intersectTrafficSelector(fo1.selector(), revertTrafficSelector); |
| 87 | if (trafficSelector == null) { |
| 88 | return null; |
| 89 | } |
| 90 | |
| 91 | TrafficTreatment trafficTreatment = unionTrafficTreatment(fo1.treatment(), fo2.treatment()); |
| 92 | |
| 93 | return DefaultForwardingObjective.builder() |
| 94 | .fromApp(fo1.appId()) |
| 95 | .makePermanent() |
| 96 | .withFlag(ForwardingObjective.Flag.VERSATILE) |
| 97 | .withPriority(fo1.priority() * priorityMultiplier + fo2.priority()) |
| 98 | .withSelector(trafficSelector) |
| 99 | .withTreatment(trafficTreatment) |
| 100 | .add(); |
| 101 | } |
| 102 | |
| 103 | public static ForwardingObjective composeOverride(ForwardingObjective fo, int priorityAddend) { |
| 104 | return DefaultForwardingObjective.builder() |
| 105 | .fromApp(fo.appId()) |
| 106 | .makePermanent() |
| 107 | .withFlag(fo.flag()) |
| 108 | .withPriority(fo.priority() + priorityAddend) |
| 109 | .withSelector(fo.selector()) |
| 110 | .withTreatment(fo.treatment()) |
| 111 | .add(); |
| 112 | } |
| 113 | |
| 114 | public static TrafficSelector intersectTrafficSelector(TrafficSelector ts1, TrafficSelector ts2) { |
| 115 | |
| 116 | TrafficSelector.Builder selectorBuilder = DefaultTrafficSelector.builder(); |
| 117 | |
| 118 | Set<Criterion.Type> ts1IntersectTs2 = getTypeSet(ts1); |
| 119 | ts1IntersectTs2.retainAll(getTypeSet(ts2)); |
| 120 | for (Criterion.Type type : ts1IntersectTs2) { |
| 121 | Criterion criterion = intersectCriterion(ts1.getCriterion(type), ts2.getCriterion(type)); |
| 122 | if (criterion == null) { |
| 123 | return null; |
| 124 | } else { |
| 125 | selectorBuilder.add(criterion); |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | Set<Criterion.Type> ts1MinusTs2 = getTypeSet(ts1); |
| 130 | ts1MinusTs2.removeAll(getTypeSet(ts2)); |
| 131 | for (Criterion.Type type : ts1MinusTs2) { |
| 132 | selectorBuilder.add(ts1.getCriterion(type)); |
| 133 | } |
| 134 | |
| 135 | Set<Criterion.Type> ts2MinusTs1 = getTypeSet(ts2); |
| 136 | ts2MinusTs1.removeAll(getTypeSet(ts1)); |
| 137 | for (Criterion.Type type : ts2MinusTs1) { |
| 138 | selectorBuilder.add(ts2.getCriterion(type)); |
| 139 | } |
| 140 | |
| 141 | return selectorBuilder.build(); |
| 142 | } |
| 143 | |
| 144 | public static TrafficTreatment unionTrafficTreatment(TrafficTreatment tt1, TrafficTreatment tt2) { |
| 145 | |
| 146 | TrafficTreatment.Builder treatmentBuilder = DefaultTrafficTreatment.builder(); |
| 147 | |
| 148 | for (Instruction instruction : tt1.allInstructions()) { |
| 149 | treatmentBuilder.add(instruction); |
| 150 | } |
| 151 | |
| 152 | for (Instruction instruction : tt2.allInstructions()) { |
| 153 | treatmentBuilder.add(instruction); |
| 154 | } |
| 155 | |
| 156 | return treatmentBuilder.build(); |
| 157 | } |
| 158 | |
Yafit Hadar | 5796d97 | 2015-10-15 13:16:11 +0300 | [diff] [blame] | 159 | //CHECKSTYLE:OFF |
Xin Jin | 313708b | 2015-07-09 13:43:04 -0700 | [diff] [blame] | 160 | public static TrafficSelector revertTreatmentSelector(TrafficTreatment trafficTreatment, |
| 161 | TrafficSelector trafficSelector) { |
| 162 | |
| 163 | TrafficSelector.Builder selectorBuilder = DefaultTrafficSelector.builder(); |
| 164 | |
| 165 | Map<Criterion.Type, Criterion> criterionMap = new HashMap<>(); |
| 166 | for (Criterion criterion : trafficSelector.criteria()) { |
| 167 | criterionMap.put(criterion.type(), criterion); |
| 168 | } |
| 169 | |
| 170 | for (Instruction instruction : trafficTreatment.allInstructions()) { |
| 171 | switch (instruction.type()) { |
Xin Jin | 313708b | 2015-07-09 13:43:04 -0700 | [diff] [blame] | 172 | case OUTPUT: |
| 173 | break; |
| 174 | case GROUP: |
| 175 | break; |
| 176 | case L0MODIFICATION: { |
| 177 | L0ModificationInstruction l0 = (L0ModificationInstruction) instruction; |
| 178 | switch (l0.subtype()) { |
Xin Jin | 313708b | 2015-07-09 13:43:04 -0700 | [diff] [blame] | 179 | case OCH: |
| 180 | if (criterionMap.containsKey(Criterion.Type.OCH_SIGID)) { |
| 181 | if (((OchSignalCriterion) criterionMap.get((Criterion.Type.OCH_SIGID))).lambda() |
| 182 | .equals(((L0ModificationInstruction.ModOchSignalInstruction) l0).lambda())) { |
| 183 | criterionMap.remove(Criterion.Type.OCH_SIGID); |
| 184 | } else { |
| 185 | return null; |
| 186 | } |
Xin Jin | 313708b | 2015-07-09 13:43:04 -0700 | [diff] [blame] | 187 | } |
| 188 | default: |
| 189 | break; |
| 190 | } |
| 191 | break; |
| 192 | } |
Yafit Hadar | 5796d97 | 2015-10-15 13:16:11 +0300 | [diff] [blame] | 193 | case L1MODIFICATION: { |
| 194 | L1ModificationInstruction l1 = (L1ModificationInstruction) instruction; |
| 195 | switch (l1.subtype()) { |
| 196 | case ODU_SIGID: |
| 197 | if (criterionMap.containsKey(Criterion.Type.ODU_SIGID)) { |
| 198 | if (((OduSignalIdCriterion) criterionMap.get((Criterion.Type.ODU_SIGID))).oduSignalId() |
| 199 | .equals(((L1ModificationInstruction.ModOduSignalIdInstruction) l1) |
| 200 | .oduSignalId())) { |
| 201 | criterionMap.remove(Criterion.Type.ODU_SIGID); |
| 202 | } else { |
| 203 | return null; |
| 204 | } |
Ray Milkey | 125572b | 2016-02-22 16:48:17 -0800 | [diff] [blame] | 205 | } |
Yafit Hadar | 5796d97 | 2015-10-15 13:16:11 +0300 | [diff] [blame] | 206 | default: |
| 207 | break; |
| 208 | } |
| 209 | break; |
| 210 | } |
Xin Jin | 313708b | 2015-07-09 13:43:04 -0700 | [diff] [blame] | 211 | case L2MODIFICATION: { |
| 212 | L2ModificationInstruction l2 = (L2ModificationInstruction) instruction; |
| 213 | switch (l2.subtype()) { |
| 214 | case ETH_SRC: |
| 215 | if (criterionMap.containsKey(Criterion.Type.ETH_SRC)) { |
| 216 | if (((EthCriterion) criterionMap.get((Criterion.Type.ETH_SRC))).mac() |
| 217 | .equals(((L2ModificationInstruction.ModEtherInstruction) l2).mac())) { |
| 218 | criterionMap.remove(Criterion.Type.ETH_SRC); |
| 219 | } else { |
| 220 | return null; |
| 221 | } |
| 222 | } else { |
| 223 | break; |
| 224 | } |
| 225 | case ETH_DST: |
| 226 | if (criterionMap.containsKey(Criterion.Type.ETH_DST)) { |
| 227 | if (((EthCriterion) criterionMap.get((Criterion.Type.ETH_DST))).mac() |
| 228 | .equals(((L2ModificationInstruction.ModEtherInstruction) l2).mac())) { |
| 229 | criterionMap.remove(Criterion.Type.ETH_DST); |
| 230 | } else { |
| 231 | return null; |
| 232 | } |
| 233 | } else { |
| 234 | break; |
| 235 | } |
| 236 | case VLAN_ID: |
| 237 | if (criterionMap.containsKey(Criterion.Type.VLAN_VID)) { |
| 238 | if (((VlanIdCriterion) criterionMap.get((Criterion.Type.VLAN_VID))).vlanId() |
| 239 | .equals(((L2ModificationInstruction.ModVlanIdInstruction) l2).vlanId())) { |
| 240 | criterionMap.remove(Criterion.Type.VLAN_VID); |
| 241 | } else { |
| 242 | return null; |
| 243 | } |
| 244 | } else { |
| 245 | break; |
| 246 | } |
| 247 | case VLAN_PCP: |
| 248 | if (criterionMap.containsKey(Criterion.Type.VLAN_PCP)) { |
| 249 | if (((VlanPcpCriterion) criterionMap.get((Criterion.Type.VLAN_PCP))).priority() |
| 250 | == ((L2ModificationInstruction.ModVlanPcpInstruction) l2).vlanPcp()) { |
| 251 | criterionMap.remove(Criterion.Type.VLAN_PCP); |
| 252 | } else { |
| 253 | return null; |
| 254 | } |
| 255 | } else { |
| 256 | break; |
| 257 | } |
| 258 | case MPLS_LABEL: |
| 259 | if (criterionMap.containsKey(Criterion.Type.MPLS_LABEL)) { |
| 260 | if (((MplsCriterion) criterionMap.get((Criterion.Type.MPLS_LABEL))).label() |
Ray Milkey | 125572b | 2016-02-22 16:48:17 -0800 | [diff] [blame] | 261 | .equals(((L2ModificationInstruction.ModMplsLabelInstruction) l2).label())) { |
Xin Jin | 313708b | 2015-07-09 13:43:04 -0700 | [diff] [blame] | 262 | criterionMap.remove(Criterion.Type.ETH_DST); |
| 263 | } else { |
| 264 | return null; |
| 265 | } |
| 266 | } else { |
| 267 | break; |
| 268 | } |
| 269 | default: |
| 270 | break; |
| 271 | } |
| 272 | break; |
| 273 | } |
| 274 | case TABLE: |
| 275 | break; |
| 276 | case L3MODIFICATION: { |
| 277 | L3ModificationInstruction l3 = (L3ModificationInstruction) instruction; |
| 278 | switch (l3.subtype()) { |
| 279 | case IPV4_SRC: |
| 280 | if (criterionMap.containsKey(Criterion.Type.IPV4_SRC)) { |
| 281 | if (((IPCriterion) criterionMap.get(Criterion.Type.IPV4_SRC)).ip() |
| 282 | .contains(((L3ModificationInstruction.ModIPInstruction) l3).ip())) { |
| 283 | criterionMap.remove(Criterion.Type.IPV4_SRC); |
| 284 | } else { |
| 285 | return null; |
| 286 | } |
| 287 | } else { |
| 288 | break; |
| 289 | } |
| 290 | case IPV4_DST: |
| 291 | if (criterionMap.containsKey(Criterion.Type.IPV4_DST)) { |
| 292 | if (((IPCriterion) criterionMap.get(Criterion.Type.IPV4_DST)).ip() |
| 293 | .contains(((L3ModificationInstruction.ModIPInstruction) l3).ip())) { |
| 294 | criterionMap.remove(Criterion.Type.IPV4_DST); |
| 295 | } else { |
| 296 | return null; |
| 297 | } |
| 298 | } else { |
| 299 | break; |
| 300 | } |
| 301 | case IPV6_SRC: |
| 302 | if (criterionMap.containsKey(Criterion.Type.IPV6_SRC)) { |
| 303 | if (((IPCriterion) criterionMap.get(Criterion.Type.IPV6_SRC)).ip() |
| 304 | .contains(((L3ModificationInstruction.ModIPInstruction) l3).ip())) { |
| 305 | criterionMap.remove(Criterion.Type.IPV6_SRC); |
| 306 | } else { |
| 307 | return null; |
| 308 | } |
| 309 | } else { |
| 310 | break; |
| 311 | } |
| 312 | case IPV6_DST: |
| 313 | if (criterionMap.containsKey(Criterion.Type.IPV6_DST)) { |
| 314 | if (((IPCriterion) criterionMap.get(Criterion.Type.IPV6_DST)).ip() |
| 315 | .contains(((L3ModificationInstruction.ModIPInstruction) l3).ip())) { |
| 316 | criterionMap.remove(Criterion.Type.IPV6_DST); |
| 317 | } else { |
| 318 | return null; |
| 319 | } |
| 320 | } else { |
| 321 | break; |
| 322 | } |
| 323 | case IPV6_FLABEL: |
| 324 | if (criterionMap.containsKey(Criterion.Type.IPV6_FLABEL)) { |
HIGUCHI Yuta | d275afd | 2015-09-09 09:57:34 +0900 | [diff] [blame] | 325 | if (((IPv6FlowLabelCriterion) criterionMap.get(Criterion.Type.IPV6_FLABEL)).flowLabel() |
| 326 | == (((L3ModificationInstruction.ModIPv6FlowLabelInstruction) l3).flowLabel())) { |
Xin Jin | 313708b | 2015-07-09 13:43:04 -0700 | [diff] [blame] | 327 | criterionMap.remove(Criterion.Type.IPV4_SRC); |
| 328 | } else { |
| 329 | return null; |
| 330 | } |
| 331 | } else { |
| 332 | break; |
| 333 | } |
| 334 | default: |
| 335 | break; |
| 336 | } |
| 337 | break; |
| 338 | } |
| 339 | case METADATA: |
| 340 | break; |
| 341 | default: |
| 342 | break; |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | for (Criterion criterion : criterionMap.values()) { |
| 347 | selectorBuilder.add(criterion); |
| 348 | } |
| 349 | |
| 350 | return selectorBuilder.build(); |
| 351 | } |
Yafit Hadar | 5796d97 | 2015-10-15 13:16:11 +0300 | [diff] [blame] | 352 | //CHECKSTYLE:ON |
Xin Jin | 313708b | 2015-07-09 13:43:04 -0700 | [diff] [blame] | 353 | |
| 354 | public static Set<Criterion.Type> getTypeSet(TrafficSelector trafficSelector) { |
| 355 | Set<Criterion.Type> typeSet = new HashSet<>(); |
| 356 | for (Criterion criterion : trafficSelector.criteria()) { |
| 357 | typeSet.add(criterion.type()); |
| 358 | } |
| 359 | return typeSet; |
| 360 | } |
| 361 | |
| 362 | public static Criterion intersectCriterion(Criterion c1, Criterion c2) { |
| 363 | switch (c1.type()) { |
| 364 | case IPV4_SRC: { |
| 365 | IpPrefix ipPrefix = intersectIpPrefix(((IPCriterion) c1).ip(), ((IPCriterion) c2).ip()); |
| 366 | if (ipPrefix == null) { |
| 367 | return null; |
| 368 | } else { |
| 369 | return Criteria.matchIPSrc(ipPrefix); |
| 370 | } |
| 371 | } |
| 372 | case IPV4_DST: { |
| 373 | IpPrefix ipPrefix = intersectIpPrefix(((IPCriterion) c1).ip(), ((IPCriterion) c2).ip()); |
| 374 | if (ipPrefix == null) { |
| 375 | return null; |
| 376 | } else { |
| 377 | return Criteria.matchIPDst(ipPrefix); |
| 378 | } |
| 379 | } |
| 380 | case IPV6_SRC: { |
| 381 | IpPrefix ipPrefix = intersectIpPrefix(((IPCriterion) c1).ip(), ((IPCriterion) c2).ip()); |
| 382 | if (ipPrefix == null) { |
| 383 | return null; |
| 384 | } else { |
| 385 | return Criteria.matchIPv6Src(ipPrefix); |
| 386 | } |
| 387 | } |
| 388 | case IPV6_DST: { |
| 389 | IpPrefix ipPrefix = intersectIpPrefix(((IPCriterion) c1).ip(), ((IPCriterion) c2).ip()); |
| 390 | if (ipPrefix == null) { |
| 391 | return null; |
| 392 | } else { |
| 393 | return Criteria.matchIPv6Dst(ipPrefix); |
| 394 | } |
| 395 | } |
| 396 | default: |
| 397 | if (!c1.equals(c2)) { |
| 398 | return null; |
| 399 | } else { |
| 400 | return c1; |
| 401 | } |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | public static IpPrefix intersectIpPrefix(IpPrefix ip1, IpPrefix ip2) { |
| 406 | if (ip1.contains(ip2)) { |
| 407 | return ip1; |
| 408 | } else if (ip2.contains(ip1)) { |
| 409 | return ip2; |
| 410 | } else { |
| 411 | return null; |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | public static FlowObjectiveCompositionTree parsePolicyString(String policy) { |
| 416 | List<FlowObjectiveCompositionTree> postfix = transformToPostfixForm(policy); |
| 417 | return buildPolicyTree(postfix); |
| 418 | } |
| 419 | |
| 420 | private static List<FlowObjectiveCompositionTree> transformToPostfixForm(String policy) { |
| 421 | Stack<Character> stack = new Stack<>(); |
| 422 | List<FlowObjectiveCompositionTree> postfix = new ArrayList<>(); |
| 423 | |
| 424 | for (int i = 0; i < policy.length(); i++) { |
| 425 | Character ch = policy.charAt(i); |
| 426 | if (Character.isDigit(ch)) { |
| 427 | |
| 428 | int applicationId = ch - '0'; |
| 429 | while (i + 1 < policy.length() && Character.isDigit(policy.charAt(i + 1))) { |
| 430 | i++; |
| 431 | applicationId = applicationId * 10 + policy.charAt(i) - '0'; |
| 432 | } |
| 433 | |
| 434 | postfix.add(new FlowObjectiveCompositionTree((short) applicationId)); |
| 435 | } else if (ch == '(') { |
| 436 | stack.push(ch); |
| 437 | } else if (ch == ')') { |
| 438 | while (stack.peek() != '(') { |
| 439 | postfix.add(new FlowObjectiveCompositionTree(stack.pop())); |
| 440 | } |
| 441 | stack.pop(); |
| 442 | } else { |
| 443 | while (!stack.isEmpty() && compareOperatorPriority(stack.peek(), ch)) { |
| 444 | postfix.add(new FlowObjectiveCompositionTree(stack.pop())); |
| 445 | } |
| 446 | stack.push(ch); |
| 447 | } |
| 448 | } |
| 449 | while (!stack.isEmpty()) { |
| 450 | postfix.add(new FlowObjectiveCompositionTree(stack.pop())); |
| 451 | } |
| 452 | |
| 453 | return postfix; |
| 454 | } |
| 455 | |
| 456 | private static boolean compareOperatorPriority(char peek, char cur) { |
| 457 | if (peek == '/' && (cur == '+' || cur == '>' || cur == '/')) { |
| 458 | return true; |
| 459 | } else if (peek == '>' && (cur == '+' || cur == '>')) { |
| 460 | return true; |
| 461 | } else if (peek == '+' && cur == '+') { |
| 462 | return true; |
| 463 | } |
| 464 | return false; |
| 465 | } |
| 466 | |
| 467 | private static FlowObjectiveCompositionTree buildPolicyTree(List<FlowObjectiveCompositionTree> postfix) { |
| 468 | Stack<FlowObjectiveCompositionTree> stack = new Stack<>(); |
| 469 | for (FlowObjectiveCompositionTree node : postfix) { |
| 470 | if (node.operator == FlowObjectiveCompositionManager.PolicyOperator.Application) { |
| 471 | stack.push(node); |
| 472 | } else { |
| 473 | node.rightChild = stack.pop(); |
| 474 | node.leftChild = stack.pop(); |
| 475 | stack.push(node); |
| 476 | } |
| 477 | } |
| 478 | return stack.pop(); |
| 479 | } |
| 480 | |
| 481 | public static Collection<ForwardingObjective> minusForwardingObjectives(Collection<ForwardingObjective> fo1, |
| 482 | Collection<ForwardingObjective> fo2) { |
| 483 | Map<Integer, ForwardingObjective> map = new HashMap<>(); |
| 484 | for (ForwardingObjective fo : fo1) { |
| 485 | map.put(fo.id(), fo); |
| 486 | } |
| 487 | for (ForwardingObjective fo : fo2) { |
| 488 | map.remove(fo.id()); |
| 489 | } |
| 490 | return map.values(); |
| 491 | } |
| 492 | |
| 493 | |
| 494 | } |