1 /*
   2  * Copyright (c) 2009, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package sun.nio.ch.sctp;
  26 
  27 import javax.tools.annotation.GenerateNativeHeader;
  28 
  29 /**
  30  * Wraps the actual message or notification so that it can be
  31  * set and returned from the native receive implementation.
  32  */
  33 /* No native methods here, but the constants are needed in the supporting JNI code */
  34 @GenerateNativeHeader
  35 public class ResultContainer {
  36     /* static final ints so that they can be referenced from native */
  37     static final int NOTHING = 0;
  38     static final int MESSAGE = 1;
  39     static final int SEND_FAILED = 2;
  40     static final int ASSOCIATION_CHANGED = 3;
  41     static final int PEER_ADDRESS_CHANGED = 4;
  42     static final int SHUTDOWN = 5;
  43 
  44     private Object value;
  45     private int type;
  46 
  47     int type() {
  48         return type;
  49     }
  50 
  51     boolean hasSomething() {
  52         return type() != NOTHING;
  53     }
  54 
  55     boolean isNotification() {
  56         return type() != MESSAGE && type() != NOTHING ? true : false;
  57     }
  58 
  59     void clear() {
  60         type = NOTHING;
  61         value = null;
  62     }
  63 
  64     SctpNotification notification() {
  65         assert type() != MESSAGE && type() != NOTHING;
  66 
  67         return (SctpNotification) value;
  68     }
  69 
  70     MessageInfoImpl getMessageInfo() {
  71         assert type() == MESSAGE;
  72 
  73         if (value instanceof MessageInfoImpl)
  74             return (MessageInfoImpl) value;
  75 
  76         return null;
  77     }
  78 
  79     SendFailed getSendFailed() {
  80         assert type() == SEND_FAILED;
  81 
  82         if (value instanceof SendFailed)
  83             return (SendFailed) value;
  84 
  85         return null;
  86     }
  87 
  88     AssociationChange getAssociationChanged() {
  89         assert type() == ASSOCIATION_CHANGED;
  90 
  91         if (value instanceof AssociationChange)
  92             return (AssociationChange) value;
  93 
  94         return null;
  95     }
  96 
  97     PeerAddrChange getPeerAddressChanged() {
  98         assert type() == PEER_ADDRESS_CHANGED;
  99 
 100         if (value instanceof PeerAddrChange)
 101             return (PeerAddrChange) value;
 102 
 103         return null;
 104     }
 105 
 106     Shutdown getShutdown() {
 107         assert type() == SHUTDOWN;
 108 
 109         if (value instanceof Shutdown)
 110             return (Shutdown) value;
 111 
 112         return null;
 113     }
 114 
 115     @Override
 116     public String toString() {
 117         StringBuilder sb = new StringBuilder();
 118         sb.append("Type: ");
 119         switch (type) {
 120             case NOTHING:              sb.append("NOTHING");             break;
 121             case MESSAGE:              sb.append("MESSAGE");             break;
 122             case SEND_FAILED:          sb.append("SEND FAILED");         break;
 123             case ASSOCIATION_CHANGED:  sb.append("ASSOCIATION CHANGE");  break;
 124             case PEER_ADDRESS_CHANGED: sb.append("PEER ADDRESS CHANGE"); break;
 125             case SHUTDOWN:             sb.append("SHUTDOWN");            break;
 126             default :                  sb.append("Unknown result type");
 127         }
 128         sb.append(", Value: ");
 129         sb.append((value == null) ? "null" : value.toString());
 130         return sb.toString();
 131     }
 132 }