5ffafb256a9e7b1383bfbc87384f92fcb6365690
[bgpcep.git] / pcep / impl / src / main / java / org / opendaylight / protocol / pcep / impl / subobject / RROLabelSubobjectParser.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.subobject;
9
10 import java.util.Arrays;
11 import java.util.BitSet;
12
13 import org.opendaylight.protocol.pcep.spi.LabelHandlerRegistry;
14 import org.opendaylight.protocol.pcep.spi.LabelParser;
15 import org.opendaylight.protocol.pcep.spi.LabelSerializer;
16 import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException;
17 import org.opendaylight.protocol.pcep.spi.RROSubobjectParser;
18 import org.opendaylight.protocol.pcep.spi.RROSubobjectSerializer;
19 import org.opendaylight.protocol.util.ByteArray;
20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.reported.route.object.rro.Subobjects;
21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.reported.route.object.rro.SubobjectsBuilder;
22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.label.subobject.LabelType;
23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.record.route.subobjects.subobject.type.LabelCase;
24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.record.route.subobjects.subobject.type.LabelCaseBuilder;
25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.record.route.subobjects.subobject.type.label._case.Label;
26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.record.route.subobjects.subobject.type.label._case.LabelBuilder;
27
28 import com.google.common.base.Preconditions;
29 import com.google.common.primitives.UnsignedBytes;
30
31 public class RROLabelSubobjectParser implements RROSubobjectParser, RROSubobjectSerializer {
32
33         public static final int TYPE = 3;
34
35         public static final int RES_F_LENGTH = 1;
36
37         public static final int C_TYPE_F_LENGTH = 1;
38
39         public static final int RES_F_OFFSET = 0;
40
41         public static final int C_TYPE_F_OFFSET = RES_F_OFFSET + RES_F_LENGTH;
42
43         public static final int HEADER_LENGTH = C_TYPE_F_OFFSET + C_TYPE_F_LENGTH;
44
45         public static final int U_FLAG_OFFSET = 0;
46         public static final int G_FLAG_OFFSET = 7;
47
48         private final LabelHandlerRegistry registry;
49
50         public RROLabelSubobjectParser(final LabelHandlerRegistry labelReg) {
51                 this.registry = Preconditions.checkNotNull(labelReg);
52         }
53
54         @Override
55         public Subobjects parseSubobject(final byte[] buffer) throws PCEPDeserializerException {
56                 if (buffer == null || buffer.length == 0) {
57                         throw new IllegalArgumentException("Array of bytes is mandatory. Can't be null or empty.");
58                 }
59                 if (buffer.length < HEADER_LENGTH) {
60                         throw new PCEPDeserializerException("Wrong length of array of bytes. Passed: " + buffer.length + "; Expected: >"
61                                         + HEADER_LENGTH + ".");
62                 }
63                 final BitSet reserved = ByteArray.bytesToBitSet(Arrays.copyOfRange(buffer, RES_F_OFFSET, RES_F_LENGTH));
64
65                 final short cType = (short) UnsignedBytes.toInt(buffer[C_TYPE_F_OFFSET]);
66
67                 final LabelParser parser = this.registry.getLabelParser(cType);
68
69                 if (parser == null) {
70                         throw new PCEPDeserializerException("Unknown C-TYPE for ero label subobject. Passed: " + cType);
71                 }
72                 final LabelBuilder builder = new LabelBuilder();
73                 builder.setUniDirectional(reserved.get(U_FLAG_OFFSET));
74                 builder.setGlobal(reserved.get(G_FLAG_OFFSET));
75                 builder.setLabelType(parser.parseLabel(ByteArray.cutBytes(buffer, HEADER_LENGTH)));
76                 return new SubobjectsBuilder().setSubobjectType(new LabelCaseBuilder().setLabel(builder.build()).build()).build();
77         }
78
79         @Override
80         public byte[] serializeSubobject(final Subobjects subobject) {
81                 final Label label = ((LabelCase) subobject.getSubobjectType()).getLabel();
82                 final LabelType l = label.getLabelType();
83                 final LabelSerializer parser = this.registry.getLabelSerializer(l);
84                 if (parser == null) {
85                         throw new IllegalArgumentException("Unknown RROLabelSubobject instance. Passed " + subobject.getSubobjectType().getClass());
86                 }
87                 final byte[] labelbytes = parser.serializeLabel(l);
88                 final byte[] retBytes = new byte[labelbytes.length + HEADER_LENGTH];
89                 System.arraycopy(labelbytes, 0, retBytes, HEADER_LENGTH, labelbytes.length);
90
91                 final BitSet reserved = new BitSet();
92                 reserved.set(U_FLAG_OFFSET, label.isUniDirectional());
93                 reserved.set(G_FLAG_OFFSET, label.isGlobal());
94                 System.arraycopy(ByteArray.bitSetToBytes(reserved, RES_F_LENGTH), 0, retBytes, RES_F_OFFSET, RES_F_LENGTH);
95                 retBytes[C_TYPE_F_OFFSET] = UnsignedBytes.checkedCast(parser.getType());
96                 return retBytes;
97         }
98
99         @Override
100         public int getType() {
101                 return TYPE;
102         }
103 }