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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// 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.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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; }





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