pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/subobject/EROExplicitExclusionRouteSubobjectParser.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.List;
  11
  12 import org.opendaylight.protocol.pcep.PCEPDeserializerException;
  13 import org.opendaylight.protocol.pcep.spi.EROSubobjectParser;
  14 import org.opendaylight.protocol.pcep.spi.EROSubobjectSerializer;
  15 import org.opendaylight.protocol.pcep.spi.XROSubobjectHandlerRegistry;
  16 import org.opendaylight.protocol.pcep.spi.XROSubobjectParser;
  17 import org.opendaylight.protocol.pcep.spi.XROSubobjectSerializer;
  18 import org.opendaylight.protocol.util.ByteArray;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.Subobjects;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.SubobjectsBuilder;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.Exrs;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.exrs.ExrsBuilder;
  23
  24 import com.google.common.collect.Lists;
  25 import com.google.common.primitives.UnsignedBytes;
  26
  27 public class EROExplicitExclusionRouteSubobjectParser implements EROSubobjectParser, EROSubobjectSerializer {
  28
  29         public static final int TYPE = 33;
  30
  31         private static final int SUB_TYPE_FLAG_F_LENGTH = 1;
  32         private static final int SUB_LENGTH_F_LENGTH = 1;
  33         private static final int SUB_HEADER_LENGTH = SUB_TYPE_FLAG_F_LENGTH + SUB_LENGTH_F_LENGTH;
  34
  35         private static final int TYPE_FLAG_F_OFFSET = 0;
  36         private static final int LENGTH_F_OFFSET = TYPE_FLAG_F_OFFSET + SUB_TYPE_FLAG_F_LENGTH;
  37         private static final int SO_CONTENTS_OFFSET = LENGTH_F_OFFSET + SUB_LENGTH_F_LENGTH;
  38
  39         private final XROSubobjectHandlerRegistry registry;
  40
  41         public EROExplicitExclusionRouteSubobjectParser(final XROSubobjectHandlerRegistry registry) {
  42                 this.registry = registry;
  43         }
  44
  45         @Override
  46         public Subobjects parseSubobject(final byte[] buffer, final boolean loose) throws PCEPDeserializerException {
  47                 if (buffer == null || buffer.length == 0) {
  48                         throw new IllegalArgumentException("Array of bytes is mandatory. Can't be null or empty.");
  49                 }
  50                 final SubobjectsBuilder builder = new SubobjectsBuilder();
  51                 builder.setLoose(loose);
  52                 final List<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.Subobjects> list = parseSubobjects(buffer);
  53                 final List<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.exrs.Exrs> exrss = Lists.newArrayList();
  54                 for (final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.Subobjects s : list) {
  55                         final ExrsBuilder b = new ExrsBuilder();
  56                         b.setAttribute(s.getAttribute());
  57                         b.setMandatory(s.isMandatory());
  58                         b.setSubobjectType(s.getSubobjectType());
  59                         exrss.add(b.build());
  60                 }
  61                 builder.setSubobjectType(new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.ExrsBuilder().setExrs(
  62                                 exrss).build());
  63                 return builder.build();
  64         }
  65
  66         @Override
  67         public byte[] serializeSubobject(final Subobjects subobject) {
  68                 if (!(subobject.getSubobjectType() instanceof Exrs)) {
  69                         throw new IllegalArgumentException("Unknown subobject instance. Passed " + subobject.getSubobjectType().getClass()
  70                                         + ". Needed Exrs.");
  71                 }
  72                 final Exrs e = (Exrs) subobject.getSubobjectType();
  73                 final List<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.Subobjects> list = Lists.newArrayList();
  74                 for (final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.exrs.Exrs ex : e.getExrs()) {
  75                         final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.SubobjectsBuilder b = new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.SubobjectsBuilder();
  76                         b.setAttribute(ex.getAttribute());
  77                         b.setMandatory(ex.isMandatory());
  78                         b.setSubobjectType(ex.getSubobjectType());
  79                         list.add(b.build());
  80                 }
  81                 return serializeSubobject(list);
  82         }
  83
  84         private List<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.Subobjects> parseSubobjects(
  85                         final byte[] bytes) throws PCEPDeserializerException {
  86                 if (bytes == null) {
  87                         throw new IllegalArgumentException("Byte array is mandatory.");
  88                 }
  89
  90                 int type;
  91
  92                 byte[] soContentsBytes;
  93                 int length;
  94                 int offset = 0;
  95
  96                 final List<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.Subobjects> subs = Lists.newArrayList();
  97
  98                 while (offset < bytes.length) {
  99
 100                         length = ByteArray.bytesToInt(ByteArray.subByte(bytes, offset + LENGTH_F_OFFSET, SUB_LENGTH_F_LENGTH));
 101
 102                         final boolean mandatory = ((bytes[offset + TYPE_FLAG_F_OFFSET] & (1 << 7)) != 0) ? true : false;
 103                         type = (bytes[offset + TYPE_FLAG_F_OFFSET] & 0xff) & ~(1 << 7);
 104                         if (length > bytes.length - offset) {
 105                                 throw new PCEPDeserializerException("Wrong length specified. Passed: " + length + "; Expected: <= "
 106                                                 + (bytes.length - offset));
 107                         }
 108
 109                         soContentsBytes = new byte[length - SO_CONTENTS_OFFSET];
 110                         System.arraycopy(bytes, offset + SO_CONTENTS_OFFSET, soContentsBytes, 0, length - SO_CONTENTS_OFFSET);
 111
 112                         final XROSubobjectParser parser = this.registry.getSubobjectParser(type);
 113
 114                         subs.add(parser.parseSubobject(soContentsBytes, mandatory));
 115
 116                         offset += length;
 117                 }
 118                 return subs;
 119         }
 120
 121         private byte[] serializeSubobject(
 122                         final List<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.Subobjects> subobjects) {
 123
 124                 final List<byte[]> result = Lists.newArrayList();
 125
 126                 int finalLength = 0;
 127
 128                 for (final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.Subobjects subobject : subobjects) {
 129
 130                         final XROSubobjectSerializer serializer = this.registry.getSubobjectSerializer(subobject.getSubobjectType());
 131
 132                         final byte[] valueBytes = serializer.serializeSubobject(subobject);
 133
 134                         final byte[] bytes = new byte[SUB_HEADER_LENGTH + valueBytes.length];
 135
 136                         final byte typeBytes = (byte) (ByteArray.cutBytes(ByteArray.intToBytes(serializer.getType()), (Integer.SIZE / 8) - 1)[0] | (subobject.isMandatory() ? 1 << 7
 137                                         : 0));
 138                         final byte lengthBytes = UnsignedBytes.checkedCast(valueBytes.length);
 139
 140                         bytes[0] = typeBytes;
 141                         bytes[1] = lengthBytes;
 142                         System.arraycopy(valueBytes, 0, bytes, SUB_HEADER_LENGTH, valueBytes.length);
 143
 144                         finalLength += bytes.length;
 145                         result.add(bytes);
 146                 }
 147
 148                 final byte[] resultBytes = new byte[finalLength];
 149                 int byteOffset = 0;
 150                 for (final byte[] b : result) {
 151                         System.arraycopy(b, 0, resultBytes, byteOffset, b.length);
 152                         byteOffset += b.length;
 153                 }
 154                 return resultBytes;
 155         }
 156
 157         @Override
 158         public int getType() {
 159                 return TYPE;
 160         }
 161 }