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.impl.object.EROSubobjectUtil;
  13 import org.opendaylight.protocol.pcep.spi.EROSubobjectParser;
  14 import org.opendaylight.protocol.pcep.spi.EROSubobjectSerializer;
  15 import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException;
  16 import org.opendaylight.protocol.pcep.spi.XROSubobjectHandlerRegistry;
  17 import org.opendaylight.protocol.pcep.spi.XROSubobjectParser;
  18 import org.opendaylight.protocol.pcep.spi.XROSubobjectSerializer;
  19 import org.opendaylight.protocol.util.ByteArray;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.ero.Subobjects;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.ero.SubobjectsBuilder;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.ExrsCase;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.ExrsCaseBuilder;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.exrs._case.Exrs;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.exrs._case.ExrsBuilder;
  26
  27 import com.google.common.collect.Lists;
  28 import com.google.common.primitives.UnsignedBytes;
  29
  30 public class EROExplicitExclusionRouteSubobjectParser implements EROSubobjectParser, EROSubobjectSerializer {
  31
  32         public static final int TYPE = 33;
  33
  34         private static final int SUB_TYPE_FLAG_F_LENGTH = 1;
  35         private static final int SUB_LENGTH_F_LENGTH = 1;
  36         private static final int SUB_HEADER_LENGTH = SUB_TYPE_FLAG_F_LENGTH + SUB_LENGTH_F_LENGTH;
  37
  38         private static final int TYPE_FLAG_F_OFFSET = 0;
  39         private static final int LENGTH_F_OFFSET = TYPE_FLAG_F_OFFSET + SUB_TYPE_FLAG_F_LENGTH;
  40         private static final int SO_CONTENTS_OFFSET = LENGTH_F_OFFSET + SUB_LENGTH_F_LENGTH;
  41
  42         private final XROSubobjectHandlerRegistry registry;
  43
  44         public EROExplicitExclusionRouteSubobjectParser(final XROSubobjectHandlerRegistry registry) {
  45                 this.registry = registry;
  46         }
  47
  48         @Override
  49         public Subobjects parseSubobject(final byte[] buffer, final boolean loose) throws PCEPDeserializerException {
  50                 if (buffer == null || buffer.length == 0) {
  51                         throw new IllegalArgumentException("Array of bytes is mandatory. Can't be null or empty.");
  52                 }
  53                 final SubobjectsBuilder builder = new SubobjectsBuilder();
  54                 builder.setLoose(loose);
  55                 final List<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.xro.Subobjects> list = parseSubobjects(buffer);
  56                 final List<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.exrs._case.exrs.Exrs> exrss = Lists.newArrayList();
  57                 for (final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.xro.Subobjects s : list) {
  58                         final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.exrs._case.exrs.ExrsBuilder b = new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.exrs._case.exrs.ExrsBuilder();
  59                         b.setAttribute(s.getAttribute());
  60                         b.setMandatory(s.isMandatory());
  61                         b.setSubobjectType(s.getSubobjectType());
  62                         exrss.add(b.build());
  63                 }
  64                 builder.setSubobjectType(new ExrsCaseBuilder().setExrs(new ExrsBuilder().setExrs(exrss).build()).build());
  65                 return builder.build();
  66         }
  67
  68         @Override
  69         public byte[] serializeSubobject(final Subobjects subobject) {
  70                 if (!(subobject.getSubobjectType() instanceof ExrsCase)) {
  71                         throw new IllegalArgumentException("Unknown subobject instance. Passed " + subobject.getSubobjectType().getClass()
  72                                         + ". Needed Exrs.");
  73                 }
  74                 final Exrs e = ((ExrsCase) subobject.getSubobjectType()).getExrs();
  75                 final List<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.xro.Subobjects> list = Lists.newArrayList();
  76                 for (final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.explicit.route.subobjects.subobject.type.exrs._case.exrs.Exrs ex : e.getExrs()) {
  77                         final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.xro.SubobjectsBuilder b = new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.xro.SubobjectsBuilder();
  78                         b.setAttribute(ex.getAttribute());
  79                         b.setMandatory(ex.isMandatory());
  80                         b.setSubobjectType(ex.getSubobjectType());
  81                         list.add(b.build());
  82                 }
  83                 return EROSubobjectUtil.formatSubobject(TYPE, subobject.isLoose(), serializeSubobject(list));
  84         }
  85
  86         private List<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.xro.Subobjects> parseSubobjects(
  87                         final byte[] bytes) throws PCEPDeserializerException {
  88                 if (bytes == null) {
  89                         throw new IllegalArgumentException("Byte array is mandatory.");
  90                 }
  91
  92                 int type;
  93
  94                 byte[] soContentsBytes;
  95                 int length;
  96                 int offset = 0;
  97
  98                 final List<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.xro.Subobjects> subs = Lists.newArrayList();
  99
 100                 while (offset < bytes.length) {
 101
 102                         length = ByteArray.bytesToInt(ByteArray.subByte(bytes, offset + LENGTH_F_OFFSET, SUB_LENGTH_F_LENGTH));
 103
 104                         final boolean mandatory = ((bytes[offset + TYPE_FLAG_F_OFFSET] & (1 << 7)) != 0) ? true : false;
 105                         type = (bytes[offset + TYPE_FLAG_F_OFFSET] & 0xff) & ~(1 << 7);
 106                         if (length > bytes.length - offset) {
 107                                 throw new PCEPDeserializerException("Wrong length specified. Passed: " + length + "; Expected: <= "
 108                                                 + (bytes.length - offset));
 109                         }
 110
 111                         soContentsBytes = new byte[length - SO_CONTENTS_OFFSET];
 112                         System.arraycopy(bytes, offset + SO_CONTENTS_OFFSET, soContentsBytes, 0, length - SO_CONTENTS_OFFSET);
 113
 114                         final XROSubobjectParser parser = this.registry.getSubobjectParser(type);
 115
 116                         subs.add(parser.parseSubobject(soContentsBytes, mandatory));
 117
 118                         offset += length;
 119                 }
 120                 return subs;
 121         }
 122
 123         private byte[] serializeSubobject(
 124                         final List<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.xro.Subobjects> subobjects) {
 125
 126                 final List<byte[]> result = Lists.newArrayList();
 127
 128                 int finalLength = 0;
 129
 130                 for (final org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.exclude.route.object.xro.Subobjects subobject : subobjects) {
 131
 132                         final XROSubobjectSerializer serializer = this.registry.getSubobjectSerializer(subobject.getSubobjectType());
 133
 134                         final byte[] valueBytes = serializer.serializeSubobject(subobject);
 135
 136                         final byte[] bytes = new byte[SUB_HEADER_LENGTH + valueBytes.length];
 137
 138                         final byte typeBytes = (byte) (UnsignedBytes.checkedCast(serializer.getType()) | (subobject.isMandatory() ? 1 << 7 : 0));
 139
 140                         final byte lengthBytes = UnsignedBytes.checkedCast(valueBytes.length + SUB_HEADER_LENGTH);
 141
 142                         bytes[0] = typeBytes;
 143                         bytes[1] = lengthBytes;
 144                         System.arraycopy(valueBytes, 0, bytes, SUB_HEADER_LENGTH, valueBytes.length);
 145
 146                         finalLength += bytes.length;
 147                         result.add(bytes);
 148                 }
 149
 150                 final byte[] resultBytes = new byte[finalLength];
 151                 int byteOffset = 0;
 152                 for (final byte[] b : result) {
 153                         System.arraycopy(b, 0, resultBytes, byteOffset, b.length);
 154                         byteOffset += b.length;
 155                 }
 156                 return resultBytes;
 157         }
 158
 159         @Override
 160         public int getType() {
 161                 return TYPE;
 162         }
 163 }