bharat saraswal | f7364db | 2015-08-11 13:39:31 +0530 | [diff] [blame] | 1 | /*
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| 2 | * Copyright 2015 Open Networking Laboratory
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| 3 | *
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 5 | * you may not use this file except in compliance with the License.
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| 6 | * You may obtain a copy of the License at
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| 7 | *
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0
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| 9 | *
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| 10 | * Unless required by applicable law or agreed to in writing, software
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | * See the License for the specific language governing permissions and
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| 14 | * limitations under the License.
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| 15 | */
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| 16 |
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| 17 | package org.onosproject.pcepio.protocol.ver1;
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| 18 |
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| 19 | import java.util.LinkedList;
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| 20 | import java.util.ListIterator;
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| 21 |
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| 22 | import org.jboss.netty.buffer.ChannelBuffer;
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| 23 | import org.onosproject.pcepio.exceptions.PcepParseException;
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| 24 | import org.onosproject.pcepio.protocol.PcepEroObject;
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| 25 | import org.onosproject.pcepio.types.AutonomousSystemTlv;
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| 26 | import org.onosproject.pcepio.types.IPv4SubObject;
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| 27 | import org.onosproject.pcepio.types.IPv6SubObject;
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| 28 | import org.onosproject.pcepio.types.PathKeySubObject;
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| 29 | import org.onosproject.pcepio.types.PcepErrorDetailInfo;
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| 30 | import org.onosproject.pcepio.types.PcepObjectHeader;
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| 31 | import org.onosproject.pcepio.types.PcepValueType;
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| 32 | import org.onosproject.pcepio.types.SrEroSubObject;
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| 33 | import org.slf4j.Logger;
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| 34 | import org.slf4j.LoggerFactory;
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| 35 |
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| 36 | import com.google.common.base.MoreObjects;
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| 37 |
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| 38 | /*
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| 39 | * rfc3209
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| 40 | 0 1 2 3
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| 41 | 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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| 42 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 43 | | Object-Class | OT |Res|P|I| Object Length (bytes) |
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| 44 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 45 | | |
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| 46 | // (Subobjects) //
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| 47 | | |
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| 48 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 49 |
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| 50 | If a Path message contains multiple EXPLICIT_ROUTE objects, only the
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| 51 | first object is meaningful. Subsequent EXPLICIT_ROUTE objects MAY be
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| 52 | ignored and SHOULD NOT be propagated.
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| 53 |
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| 54 | In current implementation, only strict hops are supported. So,
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| 55 | empty ERO with no sub-objects is considered illegal.
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| 56 |
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| 57 | Subobjects:
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| 58 | 0 1
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| 59 | 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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| 60 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-------------//----------------+
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| 61 | |L| Type | Length | (Subobject contents) |
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| 62 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-------------//----------------+
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| 63 |
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| 64 | L
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| 65 |
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| 66 | The L bit is an attribute of the subobject. The L bit is set
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| 67 | if the subobject represents a loose hop in the explicit route.
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| 68 | If the bit is not set, the subobject represents a strict hop in
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| 69 | the explicit route.
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| 70 |
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| 71 | Type
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| 72 |
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| 73 | The Type indicates the type of contents of the subobject.
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| 74 |
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| 75 |
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| 76 | Subobject 1: IPv4 address
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| 77 |
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| 78 | 0 1 2 3
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| 79 | 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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| 80 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 81 | |L| Type | Length | IPv4 address (4 bytes) |
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| 82 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 83 | | IPv4 address (continued) | Prefix Length | Resvd |
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| 84 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 85 |
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| 86 | Subobject 2: IPv6 Prefix
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| 87 |
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| 88 | 0 1 2 3
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| 89 | 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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| 90 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 91 | |L| Type | Length | IPv6 address (16 bytes) |
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| 92 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 93 | | IPv6 address (continued) |
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| 94 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 95 | | IPv6 address (continued) |
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| 96 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 97 | | IPv6 address (continued) |
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| 98 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 99 | | IPv6 address (continued) | Prefix Length | Resvd |
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| 100 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 101 |
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| 102 | Subobject 3: Autonomous System Number
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| 103 |
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| 104 | The contents of an Autonomous System (AS) number subobject are a 2-
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| 105 | octet AS number. The abstract node represented by this subobject is
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| 106 | the set of nodes belonging to the autonomous system.
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| 107 |
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| 108 | The length of the AS number subobject is 4 octets.
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| 109 |
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| 110 | Subobject 4: PATH_KEY_32_BIT_SUB_OBJ_TYPE:
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| 111 |
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| 112 | Pathkey subobject(RFC 5520):
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| 113 | 0 1 2 3
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| 114 | 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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| 115 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 116 | |L| Type | Length | Path-Key |
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| 117 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 118 | | PCE ID (4 bytes) |
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| 119 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 120 |
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| 121 | Subobject 5: SR_ERO_SUB_OBJ_TYPE:
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| 122 |
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| 123 | SR-ERO subobject: (draft-ietf-pce-segment-routing-00)
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| 124 | 0 1 2 3
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| 125 | 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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| 126 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 127 | |L| Type | Length | ST | Flags |F|S|C|M|
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| 128 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 129 | | SID |
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| 130 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 131 | // NAI (variable) //
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| 132 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 133 | */
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| 134 | public class PcepEroObjectVer1 implements PcepEroObject {
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| 135 |
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| 136 | protected static final Logger log = LoggerFactory.getLogger(PcepEroObjectVer1.class);
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| 137 |
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| 138 | public static final byte ERO_OBJ_TYPE = 1;
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| 139 | public static final byte ERO_OBJ_CLASS = 7;
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| 140 | public static final byte ERO_OBJECT_VERSION = 1;
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| 141 | public static final short ERO_OBJ_MINIMUM_LENGTH = 12;
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| 142 | public static final byte IPV4_TYPE = 1;
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| 143 | public static final byte PATH_KEY_32_BIT_SUB_OBJ_TYPE = 64;
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| 144 | public static final int LABEL_SUB_OBJ_TYPE = 3;
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| 145 | public static final int SR_ERO_SUB_OBJ_TYPE = 96;
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| 146 | public static final int OBJECT_HEADER_LENGTH = 4;
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| 147 | public static final int YTYPE_SHIFT_VALUE = 0x7F;
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| 148 |
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| 149 | static final PcepObjectHeader DEFAULT_ERO_OBJECT_HEADER = new PcepObjectHeader(ERO_OBJ_CLASS, ERO_OBJ_TYPE,
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| 150 | PcepObjectHeader.REQ_OBJ_OPTIONAL_PROCESS, PcepObjectHeader.RSP_OBJ_PROCESSED, ERO_OBJ_MINIMUM_LENGTH);
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| 151 |
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| 152 | private PcepObjectHeader eroObjHeader;
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| 153 | private LinkedList<PcepValueType> llSubObjects = new LinkedList<PcepValueType>();
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| 154 |
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| 155 | /**
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| 156 | * reset variables.
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| 157 | */
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| 158 | public PcepEroObjectVer1() {
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| 159 | this.eroObjHeader = null;
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| 160 | this.llSubObjects = null;
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| 161 | }
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| 162 |
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| 163 | /**
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| 164 | * Constructor to initialize parameters of ERO object.
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| 165 | *
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| 166 | * @param eroObjHeader ERO object header
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| 167 | * @param llSubObjects list of sub objects.
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| 168 | */
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| 169 | public PcepEroObjectVer1(PcepObjectHeader eroObjHeader, LinkedList<PcepValueType> llSubObjects) {
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| 170 |
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| 171 | this.eroObjHeader = eroObjHeader;
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| 172 | this.llSubObjects = llSubObjects;
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| 173 | }
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| 174 |
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| 175 | /**
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| 176 | * Returns ERO object header.
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| 177 | *
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| 178 | * @return eroObjHeader ERO object header
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| 179 | */
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| 180 | public PcepObjectHeader getEroObjHeader() {
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| 181 | return this.eroObjHeader;
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| 182 | }
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| 183 |
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| 184 | /**
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| 185 | * Sets Object Header.
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| 186 | *
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| 187 | * @param obj ERO object header
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| 188 | */
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| 189 | public void setEroObjHeader(PcepObjectHeader obj) {
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| 190 | this.eroObjHeader = obj;
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| 191 | }
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| 192 |
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| 193 | @Override
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| 194 | public LinkedList<PcepValueType> getSubObjects() {
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| 195 | return this.llSubObjects;
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| 196 | }
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| 197 |
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| 198 | @Override
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| 199 | public void setSubObjects(LinkedList<PcepValueType> llSubObjects) {
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| 200 | this.llSubObjects = llSubObjects;
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| 201 | }
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| 202 |
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| 203 | /**
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| 204 | * Reads from channel buffer and returns object of PcepEroObject.
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| 205 | *
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| 206 | * @param cb channel buffer.
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| 207 | * @return object of PcepEroObject
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| 208 | * @throws PcepParseException when ERO object is not present in channel buffer
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| 209 | */
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| 210 | public static PcepEroObject read(ChannelBuffer cb) throws PcepParseException {
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| 211 |
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| 212 | PcepObjectHeader eroObjHeader;
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| 213 | LinkedList<PcepValueType> llSubObjects = new LinkedList<PcepValueType>();
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| 214 |
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| 215 | eroObjHeader = PcepObjectHeader.read(cb);
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| 216 |
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| 217 | if (eroObjHeader.getObjClass() != PcepEroObjectVer1.ERO_OBJ_CLASS) {
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| 218 | log.debug("ErrorType:" + PcepErrorDetailInfo.ERROR_TYPE_6 + " ErrorValue:"
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| 219 | + PcepErrorDetailInfo.ERROR_VALUE_9);
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| 220 | throw new PcepParseException(PcepErrorDetailInfo.ERROR_TYPE_6, PcepErrorDetailInfo.ERROR_VALUE_9);
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| 221 | }
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| 222 |
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| 223 | if (eroObjHeader.getObjLen() > OBJECT_HEADER_LENGTH) {
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| 224 | ChannelBuffer tempCb = cb.readBytes(eroObjHeader.getObjLen() - OBJECT_HEADER_LENGTH);
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| 225 | llSubObjects = parseSubObjects(tempCb);
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| 226 | }
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| 227 | return new PcepEroObjectVer1(eroObjHeader, llSubObjects);
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| 228 | }
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| 229 |
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| 230 | /**
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| 231 | * Parse list of Sub Objects.
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| 232 | *
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| 233 | * @param cb channel buffer
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| 234 | * @return list of Sub Objects
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| 235 | * @throws PcepParseException when fails to parse sub object list
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| 236 | */
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| 237 | protected static LinkedList<PcepValueType> parseSubObjects(ChannelBuffer cb) throws PcepParseException {
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| 238 |
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| 239 | LinkedList<PcepValueType> llSubObjects = new LinkedList<PcepValueType>();
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| 240 |
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| 241 | while (0 < cb.readableBytes()) {
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| 242 |
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| 243 | //check the Type of the TLV
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| 244 | byte yType = cb.readByte();
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| 245 | yType = (byte) (yType & (YTYPE_SHIFT_VALUE));
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| 246 | byte hLength = cb.readByte();
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| 247 |
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| 248 | PcepValueType subObj;
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| 249 |
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| 250 | switch (yType) {
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| 251 |
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| 252 | case IPv4SubObject.TYPE:
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| 253 | subObj = IPv4SubObject.read(cb);
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| 254 | break;
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| 255 | case IPv6SubObject.TYPE:
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| 256 | byte[] ipv6Value = new byte[IPv6SubObject.VALUE_LENGTH];
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| 257 | cb.readBytes(ipv6Value, 0, IPv6SubObject.VALUE_LENGTH);
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| 258 | subObj = new IPv6SubObject(ipv6Value);
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| 259 | break;
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| 260 | case AutonomousSystemTlv.TYPE:
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| 261 | subObj = AutonomousSystemTlv.read(cb);
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| 262 | break;
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| 263 | case PathKeySubObject.TYPE:
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| 264 | subObj = PathKeySubObject.read(cb);
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| 265 | break;
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| 266 | case SrEroSubObject.TYPE:
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| 267 | subObj = SrEroSubObject.read(cb);
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| 268 | break;
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| 269 | default:
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| 270 | throw new PcepParseException("Unexpected sub object. Type: " + (int) yType);
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| 271 | }
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| 272 | // Check for the padding
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| 273 | int pad = hLength % 4;
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| 274 | if (0 < pad) {
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| 275 | pad = 4 - pad;
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| 276 | if (pad <= cb.readableBytes()) {
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| 277 | cb.skipBytes(pad);
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| 278 | }
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| 279 | }
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| 280 |
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| 281 | llSubObjects.add(subObj);
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| 282 | }
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| 283 | if (0 < cb.readableBytes()) {
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| 284 | throw new PcepParseException("Subobject parsing error. Extra bytes received.");
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| 285 | }
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| 286 | return llSubObjects;
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| 287 | }
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| 288 |
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| 289 | @Override
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| 290 | public int write(ChannelBuffer cb) throws PcepParseException {
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| 291 |
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| 292 | //write Object header
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| 293 | int objStartIndex = cb.writerIndex();
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| 294 |
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| 295 | int objLenIndex = eroObjHeader.write(cb);
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| 296 |
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| 297 | if (objLenIndex <= 0) {
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| 298 | throw new PcepParseException("Failed to write ERO object header. Index " + objLenIndex);
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| 299 | }
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| 300 |
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| 301 | ListIterator<PcepValueType> listIterator = llSubObjects.listIterator();
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| 302 |
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| 303 | while (listIterator.hasNext()) {
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| 304 | listIterator.next().write(cb);
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| 305 | }
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| 306 |
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| 307 | //Update object length now
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| 308 | int length = cb.writerIndex() - objStartIndex;
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| 309 | cb.setShort(objLenIndex, (short) length);
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| 310 | //will be helpful during print().
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| 311 | eroObjHeader.setObjLen((short) length);
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| 312 |
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| 313 | //As per RFC the length of object should be multiples of 4
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| 314 | int pad = length % 4;
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| 315 |
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| 316 | if (pad != 0) {
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| 317 | pad = 4 - pad;
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| 318 | for (int i = 0; i < pad; i++) {
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| 319 | cb.writeByte((byte) 0);
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| 320 | }
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| 321 | length = length + pad;
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| 322 | }
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| 323 |
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| 324 | objLenIndex = cb.writerIndex();
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| 325 | return objLenIndex;
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| 326 | }
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| 327 |
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| 328 | /**
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| 329 | * Builder class for PCEP ERO object.
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| 330 | */
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| 331 | public static class Builder implements PcepEroObject.Builder {
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| 332 |
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| 333 | private boolean bIsHeaderSet = false;
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| 334 |
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| 335 | private boolean bIsPFlagSet = false;
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| 336 | private boolean bPFlag;
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| 337 |
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| 338 | private boolean bIsIFlagSet = false;
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| 339 | private boolean bIFlag;
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| 340 |
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| 341 | private PcepObjectHeader eroObjHeader;
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| 342 | LinkedList<PcepValueType> llSubObjects = new LinkedList<PcepValueType>();
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| 343 |
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| 344 | @Override
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| 345 | public PcepEroObject build() {
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| 346 |
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| 347 | PcepObjectHeader eroObjHeader = this.bIsHeaderSet ? this.eroObjHeader : DEFAULT_ERO_OBJECT_HEADER;
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| 348 |
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| 349 | if (bIsPFlagSet) {
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| 350 | eroObjHeader.setPFlag(bPFlag);
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| 351 | }
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| 352 |
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| 353 | if (bIsIFlagSet) {
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| 354 | eroObjHeader.setIFlag(bIFlag);
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| 355 | }
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| 356 |
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| 357 | return new PcepEroObjectVer1(eroObjHeader, this.llSubObjects);
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| 358 | }
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| 359 |
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| 360 | @Override
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| 361 | public PcepObjectHeader getEroObjHeader() {
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| 362 | return this.eroObjHeader;
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| 363 | }
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| 364 |
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| 365 | @Override
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| 366 | public Builder setEroObjHeader(PcepObjectHeader obj) {
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| 367 | this.eroObjHeader = obj;
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| 368 | this.bIsHeaderSet = true;
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| 369 | return this;
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| 370 | }
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| 371 |
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| 372 | @Override
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| 373 | public LinkedList<PcepValueType> getSubObjects() {
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| 374 | return this.llSubObjects;
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| 375 | }
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| 376 |
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| 377 | @Override
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| 378 | public Builder setSubObjects(LinkedList<PcepValueType> llSubObjects) {
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| 379 | this.llSubObjects = llSubObjects;
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| 380 | return this;
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| 381 | }
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| 382 |
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| 383 | @Override
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| 384 | public Builder setPFlag(boolean value) {
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| 385 | this.bPFlag = value;
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| 386 | this.bIsPFlagSet = true;
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| 387 | return this;
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| 388 | }
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| 389 |
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| 390 | @Override
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| 391 | public Builder setIFlag(boolean value) {
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| 392 | this.bIFlag = value;
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| 393 | this.bIsIFlagSet = true;
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| 394 | return this;
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| 395 | }
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bharat saraswal | f7364db | 2015-08-11 13:39:31 +0530 | [diff] [blame] | 396 | }
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| 397 |
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| 398 | @Override
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| 399 | public String toString() {
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bharat saraswal | e180630 | 2015-08-21 12:16:46 +0530 | [diff] [blame^] | 400 | return MoreObjects.toStringHelper(getClass()).add("EroObjHeader", eroObjHeader).add("SubObjects", llSubObjects)
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bharat saraswal | f7364db | 2015-08-11 13:39:31 +0530 | [diff] [blame] | 401 | .toString();
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| 402 | }
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| 403 | }
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