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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.mojo.system;
import org.chromium.mojo.system.Core.HandleSignalsState;
import org.chromium.mojo.system.DataPipe.ConsumerHandle;
import org.chromium.mojo.system.DataPipe.ProducerHandle;
import java.nio.ByteBuffer;
import java.util.List;
/**
* A handle that will always be invalid.
*/
public class InvalidHandle implements UntypedHandle, MessagePipeHandle, ConsumerHandle,
ProducerHandle, SharedBufferHandle {
/**
* Instance singleton.
*/
public static final InvalidHandle INSTANCE = new InvalidHandle();
/**
* Private constructor.
*/
private InvalidHandle() {
}
/**
* @see Handle#close()
*/
@Override
public void close() {
// Do nothing.
}
/**
* @see Handle#querySignalsState()
*/
@Override
public HandleSignalsState querySignalsState() {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
/**
* @see Handle#isValid()
*/
@Override
public boolean isValid() {
return false;
}
/**
* @see Handle#getCore()
*/
@Override
public Core getCore() {
return null;
}
/**
* @see org.chromium.mojo.system.Handle#pass()
*/
@Override
public InvalidHandle pass() {
return this;
}
/**
* @see Handle#toUntypedHandle()
*/
@Override
public UntypedHandle toUntypedHandle() {
return this;
}
/**
* @see Handle#releaseNativeHandle()
*/
@Override
public int releaseNativeHandle() {
return 0;
}
/**
* @see UntypedHandle#toMessagePipeHandle()
*/
@Override
public MessagePipeHandle toMessagePipeHandle() {
return this;
}
/**
* @see UntypedHandle#toDataPipeConsumerHandle()
*/
@Override
public ConsumerHandle toDataPipeConsumerHandle() {
return this;
}
/**
* @see UntypedHandle#toDataPipeProducerHandle()
*/
@Override
public ProducerHandle toDataPipeProducerHandle() {
return this;
}
/**
* @see UntypedHandle#toSharedBufferHandle()
*/
@Override
public SharedBufferHandle toSharedBufferHandle() {
return this;
}
/**
* @see SharedBufferHandle#duplicate(SharedBufferHandle.DuplicateOptions)
*/
@Override
public SharedBufferHandle duplicate(DuplicateOptions options) {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
/**
* @see SharedBufferHandle#map(long, long, SharedBufferHandle.MapFlags)
*/
@Override
public ByteBuffer map(long offset, long numBytes, MapFlags flags) {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
/**
* @see SharedBufferHandle#unmap(java.nio.ByteBuffer)
*/
@Override
public void unmap(ByteBuffer buffer) {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
/**
* @see DataPipe.ProducerHandle#writeData(java.nio.ByteBuffer, DataPipe.WriteFlags)
*/
@Override
public ResultAnd<Integer> writeData(ByteBuffer elements, DataPipe.WriteFlags flags) {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
/**
* @see DataPipe.ProducerHandle#beginWriteData(int, DataPipe.WriteFlags)
*/
@Override
public ByteBuffer beginWriteData(int numBytes,
DataPipe.WriteFlags flags) {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
/**
* @see DataPipe.ProducerHandle#endWriteData(int)
*/
@Override
public void endWriteData(int numBytesWritten) {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
/**
* @see DataPipe.ConsumerHandle#discardData(int, DataPipe.ReadFlags)
*/
@Override
public int discardData(int numBytes, DataPipe.ReadFlags flags) {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
/**
* @see DataPipe.ConsumerHandle#readData(java.nio.ByteBuffer, DataPipe.ReadFlags)
*/
@Override
public ResultAnd<Integer> readData(ByteBuffer elements, DataPipe.ReadFlags flags) {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
/**
* @see DataPipe.ConsumerHandle#beginReadData(int, DataPipe.ReadFlags)
*/
@Override
public ByteBuffer beginReadData(int numBytes,
DataPipe.ReadFlags flags) {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
/**
* @see DataPipe.ConsumerHandle#endReadData(int)
*/
@Override
public void endReadData(int numBytesRead) {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
/**
* @see MessagePipeHandle#writeMessage(java.nio.ByteBuffer, java.util.List,
* MessagePipeHandle.WriteFlags)
*/
@Override
public void writeMessage(ByteBuffer bytes, List<? extends Handle> handles, WriteFlags flags) {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
/**
* @see MessagePipeHandle#readMessage(java.nio.ByteBuffer, int, MessagePipeHandle.ReadFlags)
*/
@Override
public ResultAnd<ReadMessageResult> readMessage(
ByteBuffer bytes, int maxNumberOfHandles, ReadFlags flags) {
throw new MojoException(MojoResult.INVALID_ARGUMENT);
}
}
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