openflowplugin-impl/src/main/java/org/opendaylight/openflowplugin/impl/registry/flow/FlowHashFactory.java

   1 /*
   2  * Copyright (c) 2015 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
   9 package org.opendaylight.openflowplugin.impl.registry.flow;
  10
  11 import com.google.common.base.MoreObjects;
  12 import com.google.common.base.Preconditions;
  13 import com.google.common.primitives.Longs;
  14 import java.math.BigInteger;
  15 import java.util.Objects;
  16 import org.opendaylight.openflowplugin.api.OFConstants;
  17 import org.opendaylight.openflowplugin.api.openflow.registry.flow.FlowHash;
  18 import org.opendaylight.openflowplugin.impl.util.HashUtil;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.Flow;
  20
  21 /**
  22  * Created by Martin Bobak &lt;mbobak@cisco.com&gt; on 8.4.2015.
  23  */
  24 public class FlowHashFactory {
  25
  26
  27     public FlowHashFactory() {
  28     }
  29
  30     public static FlowHash create(Flow flow, short version) {
  31         long hash = calculateHash(flow, version);
  32         return new FlowHashDto(hash, flow);
  33     }
  34
  35     private static long calculateHash(Flow flow, short version) {
  36         return HashUtil.calculateMatchHash(flow.getMatch(), version);
  37     }
  38
  39
  40     private static final class FlowHashDto implements FlowHash {
  41
  42         private final long flowHash;
  43         private final int intHashCode;
  44
  45         private final short tableId;
  46         private final int priority;
  47         private final BigInteger cookie;
  48
  49         public FlowHashDto(final long flowHash, final Flow flow) {
  50             this.flowHash = flowHash;
  51             this.intHashCode = Longs.hashCode(flowHash);
  52             tableId = Preconditions.checkNotNull(flow.getTableId(), "flow tableId must not be null");
  53             priority = Preconditions.checkNotNull(flow.getPriority(), "flow priority must not be null");
  54             cookie = MoreObjects.firstNonNull(flow.getCookie(), OFConstants.DEFAULT_FLOW_COOKIE).getValue();
  55         }
  56
  57
  58         @Override
  59         public int hashCode() {
  60             return intHashCode;
  61         }
  62
  63         @Override
  64         public boolean equals(final Object obj) {
  65             if (null == obj) {
  66                 return false;
  67             }
  68             if (!(obj instanceof FlowHash)) {
  69                 return false;
  70             }
  71             FlowHash that = (FlowHash) obj;
  72             if (this.flowHash == that.getFlowHash()
  73                     && this.tableId == that.getTableId()
  74                     && this.priority == that.getPriority()
  75                     && Objects.equals(this.cookie, that.getCookie())) {
  76                 return true;
  77             }
  78             return false;
  79         }
  80
  81         @Override
  82         public long getFlowHash() {
  83             return flowHash;
  84         }
  85
  86         @Override
  87         public short getTableId() {
  88             return tableId;
  89         }
  90
  91         @Override
  92         public int getPriority() {
  93             return priority;
  94         }
  95
  96         @Override
  97         public BigInteger getCookie() {
  98             return cookie;
  99         }
 100     }
 101 }