pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/message/PCEPErrorMessageParser.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.protocol.pcep.impl.message;
   9
  10 import io.netty.buffer.ByteBuf;
  11
  12 import java.util.Arrays;
  13 import java.util.List;
  14
  15 import org.opendaylight.protocol.pcep.PCEPDeserializerException;
  16 import org.opendaylight.protocol.pcep.PCEPDocumentedException;
  17 import org.opendaylight.protocol.pcep.PCEPErrorMapping;
  18 import org.opendaylight.protocol.pcep.PCEPErrors;
  19 import org.opendaylight.protocol.pcep.UnknownObject;
  20 import org.opendaylight.protocol.pcep.spi.AbstractMessageParser;
  21 import org.opendaylight.protocol.pcep.spi.ObjectHandlerRegistry;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.message.rev131007.PcerrBuilder;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Message;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Object;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.OpenObject;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.PcepErrorObject;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.PcerrMessage;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.RpObject;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.PcerrMessageBuilder;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.Errors;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.ErrorsBuilder;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.error.type.Request;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.error.type.RequestBuilder;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.error.type.Session;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.error.type.SessionBuilder;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.error.type.request.Rps;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.error.type.session.Open;
  38
  39 import com.google.common.collect.Lists;
  40
  41 /**
  42  * Parser for {@link PcerrMessage}
  43  */
  44 public class PCEPErrorMessageParser extends AbstractMessageParser {
  45
  46         public final int TYPE = 6;
  47
  48         public PCEPErrorMessageParser(final ObjectHandlerRegistry registry) {
  49                 super(registry);
  50         }
  51
  52         @Override
  53         public void serializeMessage(final Message message, final ByteBuf buffer) {
  54                 if (!(message instanceof PcerrMessage)) {
  55                         throw new IllegalArgumentException("Wrong instance of Message. Passed instance " + message.getClass()
  56                                         + ". Nedded ErrorMessage.");
  57                 }
  58                 final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.PcerrMessage err = ((PcerrMessage) message).getPcerrMessage();
  59
  60                 if (err.getErrors() == null || err.getErrors().isEmpty()) {
  61                         throw new IllegalArgumentException("Errors should not be empty.");
  62                 }
  63
  64                 if (err.getErrorType() instanceof Request) {
  65                         final List<Rps> rps = ((Request) err.getErrorType()).getRps();
  66                         for (final Rps r : rps) {
  67                                 buffer.writeBytes(serializeObject(r));
  68                         }
  69                 }
  70
  71                 for (final Errors e : err.getErrors()) {
  72                         buffer.writeBytes(serializeObject(e));
  73                 }
  74
  75                 if (err.getErrorType() instanceof Session) {
  76                         buffer.writeBytes(serializeObject(((Session) err.getErrorType()).getOpen()));
  77                 }
  78         }
  79
  80         @Override
  81         public PcerrMessage parseMessage(final byte[] buffer) throws PCEPDeserializerException, PCEPDocumentedException {
  82                 if (buffer == null || buffer.length == 0) {
  83                         throw new PCEPDeserializerException("Error message is empty.");
  84                 }
  85                 final List<Object> objs = parseObjects(buffer);
  86                 PcerrMessage m = null;
  87                 try {
  88                         m = validate(objs);
  89                 } catch (final PCEPDocumentedException e) {
  90                         final PCEPErrorMapping maping = PCEPErrorMapping.getInstance();
  91                         return new PcerrBuilder().setPcerrMessage(
  92                                         new PcerrMessageBuilder().setErrors(
  93                                                         Arrays.asList(new ErrorsBuilder().setType(maping.getFromErrorsEnum(e.getError()).type).setValue(
  94                                                                         maping.getFromErrorsEnum(e.getError()).value).build())).build()).build();
  95                 }
  96                 return m;
  97         }
  98
  99         private PcerrMessage validate(final List<Object> objects) throws PCEPDeserializerException, PCEPDocumentedException {
 100                 if (objects == null) {
 101                         throw new IllegalArgumentException("Passed list can't be null.");
 102                 }
 103
 104                 Open openObj = null;
 105                 final List<Rps> requestParameters = Lists.newArrayList();
 106                 final List<Errors> errorObjects = Lists.newArrayList();
 107                 final PcerrMessageBuilder b = new PcerrMessageBuilder();
 108
 109                 Object obj;
 110                 int state = 1;
 111                 while (!objects.isEmpty()) {
 112                         obj = objects.get(0);
 113
 114                         if (obj instanceof UnknownObject) {
 115                                 return new PcerrBuilder().setPcerrMessage(b.setErrors(((UnknownObject) obj).getErrors()).build()).build();
 116                         }
 117
 118                         switch (state) {
 119                         case 1:
 120                                 if (obj instanceof PcepErrorObject) {
 121                                         final PcepErrorObject o = (PcepErrorObject) obj;
 122                                         errorObjects.add((Errors) o);
 123                                         break;
 124                                 }
 125                                 state = 2;
 126                         case 2:
 127                                 state = 3;
 128                                 if (obj instanceof OpenObject) {
 129                                         openObj = (Open) obj;
 130                                         break;
 131                                 }
 132                         case 3:
 133                                 while (!objects.isEmpty()) {
 134                                         switch (state) {
 135                                         case 1:
 136                                                 state = 2;
 137                                                 if (obj instanceof RpObject) {
 138                                                         final RpObject o = ((RpObject) obj);
 139                                                         if (o.isProcessingRule()) {
 140                                                                 throw new PCEPDocumentedException("Invalid setting of P flag.", PCEPErrors.P_FLAG_NOT_SET);
 141                                                         }
 142                                                         requestParameters.add((Rps) o);
 143                                                         state = 1;
 144                                                         break;
 145                                                 }
 146                                         case 2:
 147                                                 if (obj instanceof PcepErrorObject) {
 148                                                         final PcepErrorObject o = (PcepErrorObject) obj;
 149                                                         errorObjects.add((Errors) o);
 150                                                         state = 2;
 151                                                         break;
 152                                                 }
 153                                                 state = 3;
 154                                         }
 155
 156                                         if (state == 3) {
 157                                                 break;
 158                                         }
 159
 160                                         objects.remove(0);
 161                                 }
 162
 163                                 state = 4;
 164                                 break;
 165                         }
 166
 167                         if (state == 4) {
 168                                 break;
 169                         }
 170
 171                         objects.remove(0);
 172                 }
 173
 174                 if (errorObjects.isEmpty() && errorObjects.isEmpty()) {
 175                         throw new PCEPDeserializerException("At least one PCEPErrorObject is mandatory.");
 176                 }
 177
 178                 if (!objects.isEmpty()) {
 179                         throw new PCEPDeserializerException("Unprocessed Objects: " + objects);
 180                 }
 181                 if (requestParameters != null) {
 182                         b.setErrorType(new RequestBuilder().setRps(requestParameters).build());
 183                 }
 184                 if (openObj != null) {
 185                         b.setErrorType(new SessionBuilder().setOpen(openObj).build());
 186                 }
 187
 188                 return new PcerrBuilder().setPcerrMessage(b.setErrors(errorObjects).build()).build();
 189         }
 190
 191         @Override
 192         public int getMessageType() {
 193                 return this.TYPE;
 194         }
 195 }