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.device.DeviceContext;
  18 import org.opendaylight.openflowplugin.api.openflow.registry.flow.FlowHash;
  19 import org.opendaylight.openflowplugin.impl.util.HashUtil;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.Flow;
  21
  22 /**
  23  * Created by Martin Bobak &lt;mbobak@cisco.com&gt; on 8.4.2015.
  24  */
  25 public class FlowHashFactory {
  26
  27
  28     public FlowHashFactory() {
  29     }
  30
  31     public static FlowHash create(Flow flow, DeviceContext deviceContext) {
  32         long hash = calculateHash(flow, deviceContext);
  33         return new FlowHashDto(hash, flow);
  34     }
  35
  36     private static long calculateHash(Flow flow, DeviceContext deviceContext) {
  37         return HashUtil.calculateMatchHash(flow.getMatch(), deviceContext);
  38     }
  39
  40
  41     private static final class FlowHashDto implements FlowHash {
  42
  43         private final long flowHash;
  44         private final int intHashCode;
  45
  46         private final short tableId;
  47         private final int priority;
  48         private final BigInteger cookie;
  49
  50         public FlowHashDto(final long flowHash, final Flow flow) {
  51             this.flowHash = flowHash;
  52             this.intHashCode = Longs.hashCode(flowHash);
  53             tableId = Preconditions.checkNotNull(flow.getTableId(), "flow tableId must not be null");
  54             priority = Preconditions.checkNotNull(flow.getPriority(), "flow priority must not be null");
  55             cookie = MoreObjects.firstNonNull(flow.getCookie(), OFConstants.DEFAULT_FLOW_COOKIE).getValue();
  56         }
  57
  58
  59         @Override
  60         public int hashCode() {
  61             return intHashCode;
  62         }
  63
  64         @Override
  65         public boolean equals(final Object obj) {
  66             if (null == obj) {
  67                 return false;
  68             }
  69             if (!(obj instanceof FlowHash)) {
  70                 return false;
  71             }
  72             FlowHash that = (FlowHash) obj;
  73             if (this.flowHash == that.getFlowHash()
  74                     && this.tableId == that.getTableId()
  75                     && this.priority == that.getPriority()
  76                     && Objects.equals(this.cookie, that.getCookie())) {
  77                 return true;
  78             }
  79             return false;
  80         }
  81
  82         @Override
  83         public long getFlowHash() {
  84             return flowHash;
  85         }
  86
  87         @Override
  88         public short getTableId() {
  89             return tableId;
  90         }
  91
  92         @Override
  93         public int getPriority() {
  94             return priority;
  95         }
  96
  97         @Override
  98         public BigInteger getCookie() {
  99             return cookie;
 100         }
 101     }
 102 }