Package com.google.protobuf

Class ByteOutput

java.lang.Object

com.google.protobuf.ByteOutput

Direct Known Subclasses:

CodedOutputStream

@ExperimentalApi
public abstract class ByteOutput
extends Object

An output target for raw bytes. This interface provides semantics that support two types of writing:

Traditional write operations: (as defined by 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).

Constructor Summary

Constructors

Constructor	Description
ByteOutput()

Method Summary

Modifier and Type	Method	Description
abstract void	write(byte value)	Writes a single byte.
abstract void	write(byte[] value, int offset, int length)	Writes a sequence of bytes.
abstract void	write(ByteBuffer value)	Writes a sequence of bytes.
abstract void	writeLazy(byte[] value, int offset, int length)	Writes a sequence of bytes.
abstract void	writeLazy(ByteBuffer value)	Writes a sequence of bytes.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ByteOutput

public ByteOutput()

Method Details

write

public abstract void write(byte value)
                    throws IOException

Writes a single byte.

Parameters:

value - the byte to be written

Throws:

IOException - thrown if an error occurred while writing

write

public abstract void write(byte[] value,
 int offset,
 int length)
                    throws IOException

Writes a sequence of bytes. The ByteOutput must copy value if it will not be processed prior to the return of this method call, since value may be reused/altered by the caller.

NOTE: This method MUST NOT modify the value. Doing so is a programming error and will lead to data corruption which will be difficult to debug.

Parameters:

value - the bytes to be written

offset - the offset of the start of the writable range

length - the number of bytes to write starting from offset

Throws:

IOException - thrown if an error occurred while writing

writeLazy

public abstract void writeLazy(byte[] value,
 int offset,
 int length)
                        throws IOException

Writes a sequence of bytes. The 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 value. Doing so is a programming error and will lead to data corruption which will be difficult to debug.

Parameters:

value - the bytes to be written

offset - the offset of the start of the writable range

length - the number of bytes to write starting from offset

Throws:

IOException - thrown if an error occurred while writing

write

public abstract void write(ByteBuffer value)
                    throws IOException

Writes a sequence of bytes. The ByteOutput must copy value if it will not be processed prior to the return of this method call, since value may be reused/altered by the caller.

NOTE: This method MUST NOT modify the value. Doing so is a programming error and will lead to data corruption which will be difficult to debug.

Parameters:

value - the bytes to be written. Upon returning from this call, the position of this buffer will be set to the limit

Throws:

IOException - thrown if an error occurred while writing

writeLazy

public abstract void writeLazy(ByteBuffer value)
                        throws IOException

Writes a sequence of bytes. The 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 value. Doing so is a programming error and will lead to data corruption which will be difficult to debug.

Parameters:

value - the bytes to be written. Upon returning from this call, the position of this buffer will be set to the limit

Throws:

IOException - thrown if an error occurred while writing