pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/subobject/EROLabelSubobjectParser.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.impl.object.EROSubobjectUtil;
  14 import org.opendaylight.protocol.pcep.spi.EROSubobjectParser;
  15 import org.opendaylight.protocol.pcep.spi.EROSubobjectSerializer;
  16 import org.opendaylight.protocol.pcep.spi.LabelHandlerRegistry;
  17 import org.opendaylight.protocol.pcep.spi.LabelParser;
  18 import org.opendaylight.protocol.pcep.spi.LabelSerializer;
  19 import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException;
  20 import org.opendaylight.protocol.util.ByteArray;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.ero.Subobject;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.ero.SubobjectBuilder;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.basic.explicit.route.subobjects.subobject.type.LabelCase;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.basic.explicit.route.subobjects.subobject.type.LabelCaseBuilder;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.basic.explicit.route.subobjects.subobject.type.label._case.Label;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.basic.explicit.route.subobjects.subobject.type.label._case.LabelBuilder;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.label.subobject.LabelType;
  28
  29 import com.google.common.base.Preconditions;
  30 import com.google.common.primitives.UnsignedBytes;
  31
  32 public class EROLabelSubobjectParser implements EROSubobjectParser, EROSubobjectSerializer {
  33
  34         public static final int TYPE = 3;
  35
  36         private static final int RES_F_LENGTH = 1;
  37
  38         private static final int C_TYPE_F_LENGTH = 1;
  39
  40         private static final int RES_F_OFFSET = 0;
  41
  42         private static final int C_TYPE_F_OFFSET = RES_F_OFFSET + RES_F_LENGTH;
  43
  44         private static final int HEADER_LENGTH = C_TYPE_F_OFFSET + C_TYPE_F_LENGTH;
  45
  46         private static final int U_FLAG_OFFSET = 0;
  47
  48         private final LabelHandlerRegistry registry;
  49
  50         public EROLabelSubobjectParser(final LabelHandlerRegistry labelReg) {
  51                 this.registry = Preconditions.checkNotNull(labelReg);
  52         }
  53
  54         @Override
  55         public Subobject parseSubobject(final byte[] buffer, final boolean loose) 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.setLabelType(parser.parseLabel(ByteArray.cutBytes(buffer, HEADER_LENGTH)));
  75                 return new SubobjectBuilder().setLoose(loose).setSubobjectType(new LabelCaseBuilder().setLabel(builder.build()).build()).build();
  76         }
  77
  78         @Override
  79         public byte[] serializeSubobject(final Subobject subobject) {
  80                 Preconditions.checkNotNull(subobject.getSubobjectType(), "Subobject type cannot be empty.");
  81
  82                 final Label label = ((LabelCase) subobject.getSubobjectType()).getLabel();
  83                 final LabelType l = label.getLabelType();
  84
  85                 final LabelSerializer serializer = this.registry.getLabelSerializer(l);
  86
  87                 if (serializer == null) {
  88                         throw new IllegalArgumentException("Unknown EROLabelSubobject instance. Passed "
  89                                         + label.getLabelType().getImplementedInterface());
  90                 }
  91                 final byte[] labelbytes = serializer.serializeLabel(l);
  92                 final byte[] retBytes = new byte[labelbytes.length + HEADER_LENGTH];
  93
  94                 System.arraycopy(labelbytes, 0, retBytes, HEADER_LENGTH, labelbytes.length);
  95
  96                 final BitSet reserved = new BitSet();
  97                 reserved.set(U_FLAG_OFFSET, label.isUniDirectional());
  98                 System.arraycopy(ByteArray.bitSetToBytes(reserved, RES_F_LENGTH), 0, retBytes, RES_F_OFFSET, RES_F_LENGTH);
  99                 retBytes[C_TYPE_F_OFFSET] = UnsignedBytes.checkedCast(serializer.getType());
 100                 return EROSubobjectUtil.formatSubobject(TYPE, subobject.isLoose(), retBytes);
 101         }
 102
 103         @Override
 104         public int getType() {
 105                 return TYPE;
 106         }
 107 }