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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 package org.chromium.mojo.system; | |
| 6 | |
| 7 import org.chromium.mojo.system.Core.HandleSignals; | |
| 8 import org.chromium.mojo.system.DataPipe.ConsumerHandle; | |
| 9 import org.chromium.mojo.system.DataPipe.ProducerHandle; | |
| 10 | |
| 11 import java.nio.ByteBuffer; | |
| 12 import java.util.List; | |
| 13 | |
| 14 /** | |
| 15 * A handle that will always be invalid. | |
| 16 */ | |
| 17 public class InvalidHandle implements UntypedHandle, MessagePipeHandle, Consumer
Handle, | |
| 18 ProducerHandle, SharedBufferHandle { | |
| 19 | |
| 20 /** | |
| 21 * Instance singleton. | |
| 22 */ | |
| 23 public static final InvalidHandle INSTANCE = new InvalidHandle(); | |
| 24 | |
| 25 /** | |
| 26 * Private constructor. | |
| 27 */ | |
| 28 private InvalidHandle() { | |
| 29 } | |
| 30 | |
| 31 /** | |
| 32 * @see Handle#close() | |
| 33 */ | |
| 34 @Override | |
| 35 public void close() { | |
| 36 // Do nothing. | |
| 37 } | |
| 38 | |
| 39 /** | |
| 40 * @see Handle#wait(Core.HandleSignals, long) | |
| 41 */ | |
| 42 @Override | |
| 43 public int wait(HandleSignals signals, long deadline) { | |
| 44 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 45 } | |
| 46 | |
| 47 /** | |
| 48 * @see Handle#isValid() | |
| 49 */ | |
| 50 @Override | |
| 51 public boolean isValid() { | |
| 52 return false; | |
| 53 } | |
| 54 | |
| 55 /** | |
| 56 * @see Handle#getCore() | |
| 57 */ | |
| 58 @Override | |
| 59 public Core getCore() { | |
| 60 return null; | |
| 61 } | |
| 62 | |
| 63 /** | |
| 64 * @see org.chromium.mojo.system.Handle#pass() | |
| 65 */ | |
| 66 @Override | |
| 67 public InvalidHandle pass() { | |
| 68 return this; | |
| 69 } | |
| 70 | |
| 71 | |
| 72 /** | |
| 73 * @see Handle#toUntypedHandle() | |
| 74 */ | |
| 75 @Override | |
| 76 public UntypedHandle toUntypedHandle() { | |
| 77 return this; | |
| 78 } | |
| 79 | |
| 80 /** | |
| 81 * @see UntypedHandle#toMessagePipeHandle() | |
| 82 */ | |
| 83 @Override | |
| 84 public MessagePipeHandle toMessagePipeHandle() { | |
| 85 return this; | |
| 86 } | |
| 87 | |
| 88 /** | |
| 89 * @see UntypedHandle#toDataPipeConsumerHandle() | |
| 90 */ | |
| 91 @Override | |
| 92 public ConsumerHandle toDataPipeConsumerHandle() { | |
| 93 return this; | |
| 94 } | |
| 95 | |
| 96 /** | |
| 97 * @see UntypedHandle#toDataPipeProducerHandle() | |
| 98 */ | |
| 99 @Override | |
| 100 public ProducerHandle toDataPipeProducerHandle() { | |
| 101 return this; | |
| 102 } | |
| 103 | |
| 104 /** | |
| 105 * @see UntypedHandle#toSharedBufferHandle() | |
| 106 */ | |
| 107 @Override | |
| 108 public SharedBufferHandle toSharedBufferHandle() { | |
| 109 return this; | |
| 110 } | |
| 111 | |
| 112 /** | |
| 113 * @see SharedBufferHandle#duplicate(SharedBufferHandle.DuplicateOptions) | |
| 114 */ | |
| 115 @Override | |
| 116 public SharedBufferHandle duplicate(DuplicateOptions options) { | |
| 117 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 118 } | |
| 119 | |
| 120 /** | |
| 121 * @see SharedBufferHandle#map(long, long, SharedBufferHandle.MapFlags) | |
| 122 */ | |
| 123 @Override | |
| 124 public ByteBuffer map(long offset, long numBytes, MapFlags flags) { | |
| 125 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 126 } | |
| 127 | |
| 128 /** | |
| 129 * @see SharedBufferHandle#unmap(java.nio.ByteBuffer) | |
| 130 */ | |
| 131 @Override | |
| 132 public void unmap(ByteBuffer buffer) { | |
| 133 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 134 } | |
| 135 | |
| 136 /** | |
| 137 * @see DataPipe.ProducerHandle#writeData(java.nio.ByteBuffer, DataPipe.Writ
eFlags) | |
| 138 */ | |
| 139 @Override | |
| 140 public int writeData(ByteBuffer elements, DataPipe.WriteFlags flags) { | |
| 141 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 142 } | |
| 143 | |
| 144 /** | |
| 145 * @see DataPipe.ProducerHandle#beginWriteData(int, DataPipe.WriteFlags) | |
| 146 */ | |
| 147 @Override | |
| 148 public ByteBuffer beginWriteData(int numBytes, | |
| 149 DataPipe.WriteFlags flags) { | |
| 150 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 151 } | |
| 152 | |
| 153 /** | |
| 154 * @see DataPipe.ProducerHandle#endWriteData(int) | |
| 155 */ | |
| 156 @Override | |
| 157 public void endWriteData(int numBytesWritten) { | |
| 158 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 159 } | |
| 160 | |
| 161 /** | |
| 162 * @see DataPipe.ConsumerHandle#discardData(int, DataPipe.ReadFlags) | |
| 163 */ | |
| 164 @Override | |
| 165 public int discardData(int numBytes, DataPipe.ReadFlags flags) { | |
| 166 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 167 } | |
| 168 | |
| 169 /** | |
| 170 * @see DataPipe.ConsumerHandle#readData(java.nio.ByteBuffer, DataPipe.ReadF
lags) | |
| 171 */ | |
| 172 @Override | |
| 173 public int readData(ByteBuffer elements, DataPipe.ReadFlags flags) { | |
| 174 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 175 } | |
| 176 | |
| 177 /** | |
| 178 * @see DataPipe.ConsumerHandle#beginReadData(int, DataPipe.ReadFlags) | |
| 179 */ | |
| 180 @Override | |
| 181 public ByteBuffer beginReadData(int numBytes, | |
| 182 DataPipe.ReadFlags flags) { | |
| 183 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 184 } | |
| 185 | |
| 186 /** | |
| 187 * @see DataPipe.ConsumerHandle#endReadData(int) | |
| 188 */ | |
| 189 @Override | |
| 190 public void endReadData(int numBytesRead) { | |
| 191 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 192 } | |
| 193 | |
| 194 /** | |
| 195 * @see MessagePipeHandle#writeMessage(java.nio.ByteBuffer, java.util.List, | |
| 196 * MessagePipeHandle.WriteFlags) | |
| 197 */ | |
| 198 @Override | |
| 199 public void writeMessage(ByteBuffer bytes, List<? extends Handle> handles, W
riteFlags flags) { | |
| 200 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 201 } | |
| 202 | |
| 203 /** | |
| 204 * @see MessagePipeHandle#readMessage(java.nio.ByteBuffer, int, MessagePipeH
andle.ReadFlags) | |
| 205 */ | |
| 206 @Override | |
| 207 public ReadMessageResult readMessage(ByteBuffer bytes, int maxNumberOfHandle
s, | |
| 208 ReadFlags flags) { | |
| 209 throw new MojoException(MojoResult.INVALID_ARGUMENT); | |
| 210 } | |
| 211 | |
| 212 } | |
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