opendaylight/netconf/netconf-mapping-api/src/main/java/org/opendaylight/controller/netconf/mapping/api/HandlingPriority.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
   9 package org.opendaylight.controller.netconf.mapping.api;
  10
  11 import com.google.common.base.Optional;
  12
  13 public class HandlingPriority implements Comparable<HandlingPriority> {
  14
  15     public static final HandlingPriority CANNOT_HANDLE = new HandlingPriority();
  16     public static final HandlingPriority HANDLE_WITH_DEFAULT_PRIORITY = new HandlingPriority(Integer.MIN_VALUE);
  17     public static final HandlingPriority HANDLE_WITH_MAX_PRIORITY = new HandlingPriority(Integer.MAX_VALUE);
  18
  19     private Integer priority;
  20
  21     public static HandlingPriority getHandlingPriority(int priority) {
  22         return new HandlingPriority(priority);
  23     }
  24
  25     private HandlingPriority(int priority) {
  26         this.priority = priority;
  27     }
  28
  29     private HandlingPriority() {
  30     }
  31
  32     /**
  33      * @return priority number or Optional.absent otherwise
  34      */
  35     public Optional<Integer> getPriority() {
  36         return Optional.of(priority).or(Optional.<Integer> absent());
  37     }
  38
  39     @Override
  40     public int compareTo(HandlingPriority o) {
  41         if (this == o)
  42             return 0;
  43         if (this == CANNOT_HANDLE)
  44             return -1;
  45         if (o == CANNOT_HANDLE)
  46             return 1;
  47
  48         if (priority > o.priority)
  49             return 1;
  50         if (priority == o.priority)
  51             return 0;
  52         if (priority < o.priority)
  53             return -1;
  54
  55         throw new IllegalStateException("Unexpected state");
  56     }
  57
  58     @Override
  59     public boolean equals(Object o) {
  60         if (this == o)
  61             return true;
  62         if (!(o instanceof HandlingPriority))
  63             return false;
  64
  65         HandlingPriority that = (HandlingPriority) o;
  66
  67         if (priority != null ? !priority.equals(that.priority) : that.priority != null)
  68             return false;
  69
  70         return true;
  71     }
  72
  73     @Override
  74     public int hashCode() {
  75         return priority != null ? priority.hashCode() : 0;
  76     }
  77 }