BUG-64 : initial rewrite, EROSubobjectRegistry.
[bgpcep.git] / pcep / impl / src / main / java / org / opendaylight / protocol / pcep / impl / subobject / RROIpv4PrefixSubobjectParser.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.concepts.Ipv4Util;
14 import org.opendaylight.protocol.pcep.impl.object.RROSubobjectUtil;
15 import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException;
16 import org.opendaylight.protocol.pcep.spi.RROSubobjectParser;
17 import org.opendaylight.protocol.pcep.spi.RROSubobjectSerializer;
18 import org.opendaylight.protocol.util.ByteArray;
19 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpPrefix;
20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.reported.route.object.rro.Subobject;
21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.reported.route.object.rro.SubobjectBuilder;
22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.IpPrefixSubobject;
23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.record.route.subobjects.subobject.type.IpPrefixCase;
24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.record.route.subobjects.subobject.type.IpPrefixCaseBuilder;
25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.record.route.subobjects.subobject.type.ip.prefix._case.IpPrefixBuilder;
26
27 import com.google.common.primitives.UnsignedBytes;
28
29 /**
30  * Parser for {@link IpPrefixCase}
31  */
32 public class RROIpv4PrefixSubobjectParser implements RROSubobjectParser, RROSubobjectSerializer {
33
34         public static final int TYPE = 1;
35
36         private static final int IP4_F_LENGTH = 4;
37
38         private static final int PREFIX_F_LENGTH = 1;
39         private static final int FLAGS_F_LENGTH = 1;
40
41         private static final int IP_F_OFFSET = 0;
42
43         private static final int PREFIX4_F_OFFSET = IP_F_OFFSET + IP4_F_LENGTH;
44         private static final int FLAGS4_F_OFFSET = PREFIX4_F_OFFSET + PREFIX_F_LENGTH;
45
46         private static final int CONTENT4_LENGTH = IP4_F_LENGTH + PREFIX_F_LENGTH + FLAGS_F_LENGTH;
47
48         private static final int LPA_F_OFFSET = 7;
49         private static final int LPIU_F_OFFSET = 6;
50
51         @Override
52         public Subobject parseSubobject(final byte[] buffer) throws PCEPDeserializerException {
53                 if (buffer == null || buffer.length == 0) {
54                         throw new IllegalArgumentException("Array of bytes is mandatory. Can't be null or empty.");
55                 }
56                 if (buffer.length != CONTENT4_LENGTH) {
57                         throw new PCEPDeserializerException("Wrong length of array of bytes. Passed: " + buffer.length + ";");
58                 }
59                 final SubobjectBuilder builder = new SubobjectBuilder();
60                 final int length = UnsignedBytes.toInt(buffer[PREFIX4_F_OFFSET]);
61                 final BitSet flags = ByteArray.bytesToBitSet(Arrays.copyOfRange(buffer, FLAGS4_F_OFFSET, FLAGS4_F_OFFSET + FLAGS_F_LENGTH));
62                 builder.setProtectionAvailable(flags.get(LPA_F_OFFSET));
63                 builder.setProtectionInUse(flags.get(LPIU_F_OFFSET));
64                 builder.setSubobjectType(new IpPrefixCaseBuilder().setIpPrefix(
65                                 new IpPrefixBuilder().setIpPrefix(
66                                                 new IpPrefix(Ipv4Util.prefixForBytes(ByteArray.subByte(buffer, IP_F_OFFSET, IP4_F_LENGTH), length))).build()).build());
67                 return builder.build();
68         }
69
70         @Override
71         public byte[] serializeSubobject(final Subobject subobject) {
72                 if (!(subobject.getSubobjectType() instanceof IpPrefixCase)) {
73                         throw new IllegalArgumentException("Unknown ReportedRouteSubobject instance. Passed " + subobject.getClass()
74                                         + ". Needed IpPrefixCase.");
75                 }
76                 final IpPrefixSubobject specObj = ((IpPrefixCase) subobject.getSubobjectType()).getIpPrefix();
77                 final IpPrefix prefix = specObj.getIpPrefix();
78
79                 if (prefix.getIpv4Prefix() == null && prefix.getIpv6Prefix() == null) {
80                         throw new IllegalArgumentException("Unknown AbstractPrefix instance. Passed " + prefix.getClass() + ".");
81                 }
82                 final BitSet flags = new BitSet(FLAGS_F_LENGTH * Byte.SIZE);
83                 flags.set(LPA_F_OFFSET, subobject.isProtectionAvailable());
84                 flags.set(LPIU_F_OFFSET, subobject.isProtectionInUse());
85
86                 if (prefix.getIpv6Prefix() != null) {
87                         return new RROIpv6PrefixSubobjectParser().serializeSubobject(subobject);
88                 }
89                 final byte[] retBytes = new byte[CONTENT4_LENGTH];
90                 ByteArray.copyWhole(Ipv4Util.bytesForPrefix(prefix.getIpv4Prefix()), retBytes, IP_F_OFFSET);
91                 retBytes[PREFIX4_F_OFFSET] = UnsignedBytes.checkedCast(Ipv4Util.getPrefixLength(prefix));
92                 ByteArray.copyWhole(ByteArray.bitSetToBytes(flags, FLAGS_F_LENGTH), retBytes, FLAGS4_F_OFFSET);
93                 return RROSubobjectUtil.formatSubobject(TYPE, retBytes);
94         }
95
96         @Override
97         public int getType() {
98                 return TYPE;
99         }
100 }