2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.protocol.pcep.spi;
10 import com.google.common.base.Optional;
11 import com.google.common.base.Preconditions;
12 import com.google.common.primitives.UnsignedBytes;
13 import io.netty.buffer.ByteBuf;
14 import java.util.ArrayList;
15 import java.util.Arrays;
16 import java.util.Collections;
17 import java.util.List;
18 import javax.annotation.Nullable;
19 import org.opendaylight.protocol.util.BitArray;
20 import org.opendaylight.protocol.util.ByteArray;
21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.iana.rev130816.EnterpriseNumber;
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.ObjectHeader;
26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcep.error.object.ErrorObjectBuilder;
27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.PcerrMessageBuilder;
28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.ErrorsBuilder;
29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.error.type.RequestCaseBuilder;
30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.error.type.request._case.RequestBuilder;
31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.pcerr.message.pcerr.message.error.type.request._case.request.RpsBuilder;
32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.rp.object.Rp;
33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.vendor.information.objects.VendorInformationObject;
35 public abstract class AbstractMessageParser implements MessageParser, MessageSerializer {
37 private static final int COMMON_OBJECT_HEADER_LENGTH = 4;
39 private static final int OT_SF_LENGTH = 4;
41 * offsets of fields inside of multi-field in bits
43 private static final int OT_SF_OFFSET = 0;
45 * flags offsets inside multi-filed
47 private static final int PROCESSED = 6;
48 private static final int IGNORED = 7;
50 private final ObjectRegistry registry;
51 private final VendorInformationObjectRegistry viRegistry;
53 protected AbstractMessageParser(final ObjectRegistry registry) {
54 this.registry = Preconditions.checkNotNull(registry);
55 this.viRegistry = null;
58 protected AbstractMessageParser(final ObjectRegistry registry, final VendorInformationObjectRegistry viRegistry) {
59 this.registry = Preconditions.checkNotNull(registry);
60 this.viRegistry = Preconditions.checkNotNull(viRegistry);
64 * Calls registry to pick up specific object serializer for given object.
65 * Checks if the object is not null.
66 * @param object Object to be serialized, may be null
67 * @param buffer ByteBuf where the object should be serialized
69 protected void serializeObject(@Nullable final Object object, final ByteBuf buffer) {
73 this.registry.serializeObject(object, buffer);
76 private List<Object> parseObjects(final ByteBuf bytes) throws PCEPDeserializerException {
77 final List<Object> objs = new ArrayList<>();
78 while (bytes.isReadable()) {
79 if (bytes.readableBytes() < COMMON_OBJECT_HEADER_LENGTH) {
80 throw new PCEPDeserializerException("Too few bytes in passed array. Passed: " + bytes.readableBytes() + " Expected: >= "
81 + COMMON_OBJECT_HEADER_LENGTH + ".");
83 final int objClass = bytes.readUnsignedByte();
85 final byte flagsByte = bytes.readByte();
86 final BitArray flags = BitArray.valueOf(flagsByte);
87 final int objType = UnsignedBytes.toInt(ByteArray.copyBitsRange(flagsByte, OT_SF_OFFSET, OT_SF_LENGTH));
88 final int objLength = bytes.readUnsignedShort();
90 if (bytes.readableBytes() < objLength - COMMON_OBJECT_HEADER_LENGTH) {
91 throw new PCEPDeserializerException("Too few bytes in passed array. Passed: " + bytes.readableBytes() + " Expected: >= "
94 // copy bytes for deeper parsing
95 final ByteBuf bytesToPass = bytes.readSlice(objLength - COMMON_OBJECT_HEADER_LENGTH);
97 final ObjectHeader header = new ObjectHeaderImpl(flags.get(PROCESSED), flags.get(IGNORED));
99 if (VendorInformationUtil.isVendorInformationObject(objClass, objType)) {
100 Preconditions.checkState(this.viRegistry != null);
101 final EnterpriseNumber enterpriseNumber = new EnterpriseNumber(bytesToPass.readUnsignedInt());
102 final Optional<? extends Object> obj = this.viRegistry.parseVendorInformationObject(enterpriseNumber, header, bytesToPass);
103 if (obj.isPresent()) {
107 // parseObject is required to return null for P=0 errored objects
108 final Object o = this.registry.parseObject(objClass, objType, header, bytesToPass);
118 public static Message createErrorMsg(final PCEPErrors e, final Optional<Rp> rp) {
119 final PcerrMessageBuilder msgBuilder = new PcerrMessageBuilder();
120 if (rp.isPresent()) {
121 new RequestCaseBuilder().setRequest(new RequestBuilder().setRps(Collections.singletonList(new RpsBuilder().setRp(
122 rp.get()).build())).build()).build();
124 return new PcerrBuilder().setPcerrMessage(
125 msgBuilder.setErrors(Arrays.asList(new ErrorsBuilder().setErrorObject(
126 new ErrorObjectBuilder().setType(e.getErrorType()).setValue(
127 e.getErrorValue()).build()).build())).build()).build();
130 protected abstract Message validate(final List<Object> objects, final List<Message> errors) throws PCEPDeserializerException;
133 public final Message parseMessage(final ByteBuf buffer, final List<Message> errors) throws PCEPDeserializerException {
134 Preconditions.checkNotNull(buffer, "Buffer may not be null");
136 // Parse objects first
137 final List<Object> objs = parseObjects(buffer);
140 return validate(objs, errors);
143 protected final void serializeVendorInformationObjects(final List<VendorInformationObject> viObjects, final ByteBuf buffer) {
144 if (viObjects != null) {
145 for (final VendorInformationObject viObject : viObjects) {
146 this.viRegistry.serializeVendorInformationObject(viObject, buffer);
151 protected final List<VendorInformationObject> addVendorInformationObjects(final List<Object> objects) {
152 final List<VendorInformationObject> vendorInfo = new ArrayList<>();
153 while (!objects.isEmpty() && objects.get(0) instanceof VendorInformationObject) {
154 final VendorInformationObject viObject = (VendorInformationObject) objects.get(0);
155 vendorInfo.add(viObject);