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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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package com.google.protobuf;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* An output target for raw bytes. This interface provides semantics that support two types of
* writing:
*
* Traditional write operations: (as defined by {@link java.io.OutputStream}) where the
* target method is responsible for either copying the data or completing the write before returning
* from the method call.
*
*
Lazy write operations: where the caller guarantees that it will never modify the
* provided buffer and it can therefore be considered immutable. The target method is free to
* maintain a reference to the buffer beyond the scope of the method call (e.g. until the write
* operation completes).
*/
@ExperimentalApi
public abstract class ByteOutput {
/**
* Writes a single byte.
*
* @param value the byte to be written
* @throws IOException thrown if an error occurred while writing
*/
public abstract void write(byte value) throws IOException;
/**
* Writes a sequence of bytes. The {@link ByteOutput} must copy {@code value} if it will not be
* processed prior to the return of this method call, since {@code value} may be reused/altered by
* the caller.
*
*
NOTE: This method MUST NOT modify the {@code value}. Doing so is a
* programming error and will lead to data corruption which will be difficult to debug.
*
* @param value the bytes to be written
* @param offset the offset of the start of the writable range
* @param length the number of bytes to write starting from {@code offset}
* @throws IOException thrown if an error occurred while writing
*/
public abstract void write(byte[] value, int offset, int length) throws IOException;
/**
* Writes a sequence of bytes. The {@link ByteOutput} is free to retain a reference to the value
* beyond the scope of this method call (e.g. write later) since it is considered immutable and is
* guaranteed not to change by the caller.
*
*
NOTE: This method MUST NOT modify the {@code value}. Doing so is a
* programming error and will lead to data corruption which will be difficult to debug.
*
* @param value the bytes to be written
* @param offset the offset of the start of the writable range
* @param length the number of bytes to write starting from {@code offset}
* @throws IOException thrown if an error occurred while writing
*/
public abstract void writeLazy(byte[] value, int offset, int length) throws IOException;
/**
* Writes a sequence of bytes. The {@link ByteOutput} must copy {@code value} if it will not be
* processed prior to the return of this method call, since {@code value} may be reused/altered by
* the caller.
*
*
NOTE: This method MUST NOT modify the {@code value}. Doing so is a
* programming error and will lead to data corruption which will be difficult to debug.
*
* @param value the bytes to be written. Upon returning from this call, the {@code position} of
* this buffer will be set to the {@code limit}
* @throws IOException thrown if an error occurred while writing
*/
public abstract void write(ByteBuffer value) throws IOException;
/**
* Writes a sequence of bytes. The {@link ByteOutput} is free to retain a reference to the value
* beyond the scope of this method call (e.g. write later) since it is considered immutable and is
* guaranteed not to change by the caller.
*
*
NOTE: This method MUST NOT modify the {@code value}. Doing so is a
* programming error and will lead to data corruption which will be difficult to debug.
*
* @param value the bytes to be written. Upon returning from this call, the {@code position} of
* this buffer will be set to the {@code limit}
* @throws IOException thrown if an error occurred while writing
*/
public abstract void writeLazy(ByteBuffer value) throws IOException;
}