1 /* 2 * Copyright (c) 2009, 2013, 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 java.lang.annotation.Native; 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 public class ResultContainer { 34 /* static final ints so that they can be referenced from native */ 35 @Native static final int NOTHING = 0; 36 @Native static final int MESSAGE = 1; 37 @Native static final int SEND_FAILED = 2; 38 @Native static final int ASSOCIATION_CHANGED = 3; 39 @Native static final int PEER_ADDRESS_CHANGED = 4; 40 @Native static final int SHUTDOWN = 5; 41 42 private Object value; 43 private int type; 44 45 int type() { 46 return type; 47 } 48 49 boolean hasSomething() { 50 return type() != NOTHING; 51 } 52 53 boolean isNotification() { 54 return type() != MESSAGE && type() != NOTHING ? true : false; 55 } 56 57 void clear() { 58 type = NOTHING; 59 value = null; 60 } 61 62 SctpNotification notification() { 63 assert type() != MESSAGE && type() != NOTHING; 64 65 return (SctpNotification) value; 66 } 67 68 MessageInfoImpl getMessageInfo() { 69 assert type() == MESSAGE; 70 71 if (value instanceof MessageInfoImpl) 72 return (MessageInfoImpl) value; 73 74 return null; 75 } 76 77 SendFailed getSendFailed() { 78 assert type() == SEND_FAILED; 79 80 if (value instanceof SendFailed) 81 return (SendFailed) value; 82 83 return null; 84 } 85 86 AssociationChange getAssociationChanged() { 87 assert type() == ASSOCIATION_CHANGED; 88 89 if (value instanceof AssociationChange) 90 return (AssociationChange) value; 91 92 return null; 93 } 94 95 PeerAddrChange getPeerAddressChanged() { 96 assert type() == PEER_ADDRESS_CHANGED; 97 98 if (value instanceof PeerAddrChange) 99 return (PeerAddrChange) value; 100 101 return null; 102 } 103 104 Shutdown getShutdown() { 105 assert type() == SHUTDOWN; 106 107 if (value instanceof Shutdown) 108 return (Shutdown) value; 109 110 return null; 111 } 112 113 @Override 114 public String toString() { 115 StringBuilder sb = new StringBuilder(); 116 sb.append("Type: "); 117 switch (type) { 118 case NOTHING: sb.append("NOTHING"); break; 119 case MESSAGE: sb.append("MESSAGE"); break; 120 case SEND_FAILED: sb.append("SEND FAILED"); break; 121 case ASSOCIATION_CHANGED: sb.append("ASSOCIATION CHANGE"); break; 122 case PEER_ADDRESS_CHANGED: sb.append("PEER ADDRESS CHANGE"); break; 123 case SHUTDOWN: sb.append("SHUTDOWN"); break; 124 default : sb.append("Unknown result type"); 125 } 126 sb.append(", Value: "); 127 sb.append((value == null) ? "null" : value.toString()); 128 return sb.toString(); 129 } 130 }