Package org.gnome.gio

Class OutputStream

java.lang.Object

io.github.jwharm.javagi.base.ProxyInstance

org.gnome.gobject.TypeInstance

org.gnome.gobject.GObject

org.gnome.gio.OutputStream

All Implemented Interfaces:

Proxy, AutoCloseable, AutoCloseable

Direct Known Subclasses:

FileOutputStream, FilterOutputStream, MemoryOutputStream, OutputStream.OutputStreamImpl, PollableOutputStream.PollableOutputStreamImpl, UnixOutputStream, Win32OutputStream

@Generated("io.github.jwharm.JavaGI")
public abstract class OutputStream
extends GObject
implements AutoCloseable

GOutputStream is a base class for implementing streaming output.

It has functions to write to a stream (write(byte[], org.gnome.gio.Cancellable)), to close a stream (close(org.gnome.gio.Cancellable)) and to flush pending writes (flush(org.gnome.gio.Cancellable)).

To copy the content of an input stream to an output stream without manually handling the reads and writes, use splice(org.gnome.gio.InputStream, java.util.Set<org.gnome.gio.OutputStreamSpliceFlags>, org.gnome.gio.Cancellable).

See the documentation for IOStream for details of thread safety of streaming APIs.

All of these functions have async variants too.

All classes derived from GOutputStream should implement synchronous writing, splicing, flushing and closing streams, but may implement asynchronous versions.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	OutputStream.Builder<B extends OutputStream.Builder<B>>	Inner class implementing a builder pattern to construct a GObject with properties.
static class	OutputStream.OutputStreamClass
static class	OutputStream.OutputStreamImpl	The OutputStreamImpl type represents a native instance of the abstract OutputStream class.

Nested classes/interfaces inherited from class org.gnome.gobject.GObject

GObject.NotifyCallback, GObject.ObjectClass

Constructor Summary

Constructors

Constructor	Description
OutputStream(MemorySegment address)	Create a OutputStream proxy instance for the provided memory address.

Method Summary

Modifier and Type	Method	Description
protected OutputStream	asParent()	Returns this instance as if it were its parent type.
static OutputStream.Builder<? extends OutputStream.Builder>	builder()	A OutputStream.Builder object constructs a OutputStream with the specified properties.
void	clearPending()	Clears the pending flag on this OutputStream.
boolean	close(@Nullable Cancellable cancellable)	Closes the stream, releasing resources related to it.
void	closeAsync(int ioPriority, @Nullable Cancellable cancellable, @Nullable AsyncReadyCallback callback)	Requests an asynchronous close of the stream, releasing resources related to it.
boolean	closeFinish(AsyncResult result)	Closes an output stream.
protected boolean	closeFn(@Nullable Cancellable cancellable)
boolean	flush(@Nullable Cancellable cancellable)	Forces a write of all user-space buffered data for the given this OutputStream.
void	flushAsync(int ioPriority, @Nullable Cancellable cancellable, @Nullable AsyncReadyCallback callback)	Forces an asynchronous write of all user-space buffered data for the given this OutputStream.
boolean	flushFinish(AsyncResult result)	Finishes flushing an output stream.
static MemoryLayout	getMemoryLayout()	The memory layout of the native struct.
static Type	getType()	Get the GType of the OutputStream class
boolean	hasPending()	Checks if an output stream has pending actions.
boolean	isClosed()	Checks if an output stream has already been closed.
boolean	isClosing()	Checks if an output stream is being closed.
boolean	printf(@Nullable Out<Long> bytesWritten, @Nullable Cancellable cancellable, GError[] error, String format, Object... varargs)	This is a utility function around g_output_stream_write_all().
boolean	setPending()	Sets this OutputStream to have actions pending.
long	splice(InputStream source, Set<OutputStreamSpliceFlags> flags, @Nullable Cancellable cancellable)	Splices an input stream into an output stream.
long	splice(InputStream source, OutputStreamSpliceFlags flags, @Nullable Cancellable cancellable)	Splices an input stream into an output stream.
void	spliceAsync(InputStream source, Set<OutputStreamSpliceFlags> flags, int ioPriority, @Nullable Cancellable cancellable, @Nullable AsyncReadyCallback callback)	Splices a stream asynchronously.
void	spliceAsync(InputStream source, OutputStreamSpliceFlags flags, int ioPriority, @Nullable Cancellable cancellable, @Nullable AsyncReadyCallback callback)	Splices a stream asynchronously.
long	spliceFinish(AsyncResult result)	Finishes an asynchronous stream splice operation.
long	write(byte[] buffer, @Nullable Cancellable cancellable)	Tries to write count bytes from buffer into the stream.
boolean	writeAll(byte[] buffer, @Nullable Out<Long> bytesWritten, @Nullable Cancellable cancellable)	Tries to write count bytes from buffer into the stream.
void	writeAllAsync(byte[] buffer, int ioPriority, @Nullable Cancellable cancellable, @Nullable AsyncReadyCallback callback)	Request an asynchronous write of count bytes from buffer into the stream.
boolean	writeAllFinish(AsyncResult result, @Nullable Out<Long> bytesWritten)	Finishes an asynchronous stream write operation started with g_output_stream_write_all_async().
void	writeAsync(byte[] buffer, int ioPriority, @Nullable Cancellable cancellable, @Nullable AsyncReadyCallback callback)	Request an asynchronous write of count bytes from buffer into the stream.
long	writeBytes(Bytes bytes, @Nullable Cancellable cancellable)	A wrapper function for g_output_stream_write() which takes a GBytes as input.
void	writeBytesAsync(Bytes bytes, int ioPriority, @Nullable Cancellable cancellable, @Nullable AsyncReadyCallback callback)	This function is similar to g_output_stream_write_async(), but takes a GBytes as input.
long	writeBytesFinish(AsyncResult result)	Finishes a stream write-from-GBytes operation.
long	writeFinish(AsyncResult result)	Finishes a stream write operation.
boolean	writev(OutputVector[] vectors, @Nullable Out<Long> bytesWritten, @Nullable Cancellable cancellable)	Tries to write the bytes contained in the nVectors vectors into the stream.
boolean	writevAll(OutputVector[] vectors, @Nullable Out<Long> bytesWritten, @Nullable Cancellable cancellable)	Tries to write the bytes contained in the nVectors vectors into the stream.
void	writevAllAsync(OutputVector[] vectors, int ioPriority, @Nullable Cancellable cancellable, @Nullable AsyncReadyCallback callback)	Request an asynchronous write of the bytes contained in the nVectors vectors into the stream.
boolean	writevAllFinish(AsyncResult result, @Nullable Out<Long> bytesWritten)	Finishes an asynchronous stream write operation started with g_output_stream_writev_all_async().
void	writevAsync(OutputVector[] vectors, int ioPriority, @Nullable Cancellable cancellable, @Nullable AsyncReadyCallback callback)	Request an asynchronous write of the bytes contained in nVectors vectors into the stream.
boolean	writevFinish(AsyncResult result, @Nullable Out<Long> bytesWritten)	Finishes a stream writev operation.

Methods inherited from class org.gnome.gobject.GObject

addToggleRef, addWeakPointer, bindProperty, bindProperty, bindProperty, bindPropertyFull, bindPropertyFull, bindPropertyWithClosures, bindPropertyWithClosures, compatControl, connect, connect, connect, constructed, disconnect, dispatchPropertiesChanged, dispose, dupData, dupQdata, emit, emitNotify, finalize_, forceFloating, freezeNotify, get, getData, getProperty, getProperty, getProperty, getQdata, getv, interfaceFindProperty, interfaceInstallProperty, interfaceListProperties, isFloating, newInstance, newInstance, newInstance, newInstance, newv, notify_, notify_, notifyByPspec, onNotify, ref, refSink, removeToggleRef, removeWeakPointer, replaceData, replaceQdata, runDispose, set, setData, setDataFull, setProperty, setProperty, setProperty, setQdata, setQdataFull, setv, stealData, stealQdata, takeRef, thawNotify, unref, watchClosure, weakRef, weakUnref, withProperties

Methods inherited from class org.gnome.gobject.TypeInstance

callParent, callParent, getPrivate, readGClass, writeGClass

Methods inherited from class io.github.jwharm.javagi.base.ProxyInstance

equals, handle, hashCode

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.github.jwharm.javagi.gio.AutoCloseable

close

Constructor Details

OutputStream

public OutputStream(MemorySegment address)

Create a OutputStream proxy instance for the provided memory address.

Parameters:

address - the memory address of the native object

Method Details

getType

public static Type getType()

Get the GType of the OutputStream class

Returns:

the GType

getMemoryLayout

public static MemoryLayout getMemoryLayout()

The memory layout of the native struct.

Returns:

the memory layout

asParent

protected OutputStream asParent()

Returns this instance as if it were its parent type. This is mostly synonymous to the Java super keyword, but will set the native typeclass function pointers to the parent type. When overriding a native virtual method in Java, "chaining up" with super.methodName() doesn't work, because it invokes the overridden function pointer again. To chain up, call asParent().methodName(). This will call the native function pointer of this virtual method in the typeclass of the parent type.

Overrides:

asParent in class GObject

clearPending

public void clearPending()

Clears the pending flag on this OutputStream.

close

public boolean close(@Nullable
 @Nullable Cancellable cancellable)
              throws GErrorException

Closes the stream, releasing resources related to it.

Once the stream is closed, all other operations will return IOErrorEnum.CLOSED. Closing a stream multiple times will not return an error.

Closing a stream will automatically flush any outstanding buffers in the stream.

Streams will be automatically closed when the last reference is dropped, but you might want to call this function to make sure resources are released as early as possible.

Some streams might keep the backing store of the stream (e.g. a file descriptor) open after the stream is closed. See the documentation for the individual stream for details.

On failure the first error that happened will be reported, but the close operation will finish as much as possible. A stream that failed to close will still return IOErrorEnum.CLOSED for all operations. Still, it is important to check and report the error to the user, otherwise there might be a loss of data as all data might not be written.

If cancellable is not null, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error IOErrorEnum.CANCELLED will be returned. Cancelling a close will still leave the stream closed, but there some streams can use a faster close that doesn't block to e.g. check errors. On cancellation (as with any error) there is no guarantee that all written data will reach the target.

Specified by:

close in interface AutoCloseable

Parameters:

cancellable - optional cancellable object

Returns:

true on success, false on failure

Throws:

GErrorException - see GError

closeAsync

public void closeAsync(int ioPriority,
 @Nullable
 @Nullable Cancellable cancellable,
 @Nullable
 @Nullable AsyncReadyCallback callback)

Requests an asynchronous close of the stream, releasing resources related to it. When the operation is finished callback will be called. You can then call g_output_stream_close_finish() to get the result of the operation.

For behaviour details see g_output_stream_close().

The asynchronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

Parameters:

ioPriority - the io priority of the request.

cancellable - optional cancellable object

callback - a GAsyncReadyCallback to call when the request is satisfied

closeFinish

public boolean closeFinish(AsyncResult result)
                    throws GErrorException

Closes an output stream.

Parameters:

result - a GAsyncResult.

Returns:

true if stream was successfully closed, false otherwise.

Throws:

GErrorException - see GError

flush

public boolean flush(@Nullable
 @Nullable Cancellable cancellable)
              throws GErrorException

Forces a write of all user-space buffered data for the given this OutputStream. Will block during the operation. Closing the stream will implicitly cause a flush.

This function is optional for inherited classes.

If cancellable is not null, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error IOErrorEnum.CANCELLED will be returned.

Parameters:

cancellable - optional cancellable object

Returns:

true on success, false on error

Throws:

GErrorException - see GError

flushAsync

public void flushAsync(int ioPriority,
 @Nullable
 @Nullable Cancellable cancellable,
 @Nullable
 @Nullable AsyncReadyCallback callback)

Forces an asynchronous write of all user-space buffered data for the given this OutputStream. For behaviour details see g_output_stream_flush().

When the operation is finished callback will be called. You can then call g_output_stream_flush_finish() to get the result of the operation.

Parameters:

ioPriority - the io priority of the request.

cancellable - optional GCancellable object, null to ignore.

callback - a GAsyncReadyCallback to call when the request is satisfied

flushFinish

public boolean flushFinish(AsyncResult result)
                    throws GErrorException

Finishes flushing an output stream.

Parameters:

result - a GAsyncResult.

Returns:

true if flush operation succeeded, false otherwise.

Throws:

GErrorException - see GError

hasPending

public boolean hasPending()

Checks if an output stream has pending actions.

Returns:

true if this OutputStream has pending actions.

isClosed

public boolean isClosed()

Checks if an output stream has already been closed.

Returns:

true if this OutputStream is closed. false otherwise.

isClosing

public boolean isClosing()

Checks if an output stream is being closed. This can be used inside e.g. a flush implementation to see if the flush (or other i/o operation) is called from within the closing operation.

Returns:

true if this OutputStream is being closed. false otherwise.

printf

public boolean printf(@Nullable
 @Nullable Out<Long> bytesWritten,
 @Nullable
 @Nullable Cancellable cancellable,
 GError[] error,
 String format,
 Object... varargs)

This is a utility function around g_output_stream_write_all(). It uses g_strdup_vprintf() to turn format and ... into a string that is then written to this OutputStream.

See the documentation of g_output_stream_write_all() about the behavior of the actual write operation.

Note that partial writes cannot be properly checked with this function due to the variable length of the written string, if you need precise control over partial write failures, you need to create you own printf()-like wrapper around g_output_stream_write() or g_output_stream_write_all().

Parameters:

bytesWritten - location to store the number of bytes that was written to the stream

cancellable - optional GCancellable object, null to ignore.

error - location to store the error occurring, or null to ignore

format - the format string. See the printf() documentation

varargs - the parameters to insert into the format string

Returns:

true on success, false if there was an error

setPending

public boolean setPending()
                   throws GErrorException

Sets this OutputStream to have actions pending. If the pending flag is already set or this OutputStream is closed, it will return false and set error.

Returns:

true if pending was previously unset and is now set.

Throws:

GErrorException - see GError

splice

public long splice(InputStream source,
 Set<OutputStreamSpliceFlags> flags,
 @Nullable
 @Nullable Cancellable cancellable)
            throws GErrorException

Splices an input stream into an output stream.

Parameters:

source - a GInputStream.

flags - a set of GOutputStreamSpliceFlags.

cancellable - optional GCancellable object, null to ignore.

Returns:

a gssize containing the size of the data spliced, or -1 if an error occurred. Note that if the number of bytes spliced is greater than G_MAXSSIZE, then that will be returned, and there is no way to determine the actual number of bytes spliced.

Throws:

GErrorException - see GError

splice

public long splice(InputStream source,
 OutputStreamSpliceFlags flags,
 @Nullable
 @Nullable Cancellable cancellable)
            throws GErrorException

Splices an input stream into an output stream.

Parameters:

source - a GInputStream.

flags - a set of GOutputStreamSpliceFlags.

cancellable - optional GCancellable object, null to ignore.

Returns:

a gssize containing the size of the data spliced, or -1 if an error occurred. Note that if the number of bytes spliced is greater than G_MAXSSIZE, then that will be returned, and there is no way to determine the actual number of bytes spliced.

Throws:

GErrorException - see GError

spliceAsync

public void spliceAsync(InputStream source,
 Set<OutputStreamSpliceFlags> flags,
 int ioPriority,
 @Nullable
 @Nullable Cancellable cancellable,
 @Nullable
 @Nullable AsyncReadyCallback callback)

Splices a stream asynchronously. When the operation is finished callback will be called. You can then call g_output_stream_splice_finish() to get the result of the operation.

For the synchronous, blocking version of this function, see g_output_stream_splice().

Parameters:

source - a GInputStream.

flags - a set of GOutputStreamSpliceFlags.

ioPriority - the io priority of the request.

cancellable - optional GCancellable object, null to ignore.

callback - a GAsyncReadyCallback to call when the request is satisfied

spliceAsync

public void spliceAsync(InputStream source,
 OutputStreamSpliceFlags flags,
 int ioPriority,
 @Nullable
 @Nullable Cancellable cancellable,
 @Nullable
 @Nullable AsyncReadyCallback callback)

Splices a stream asynchronously. When the operation is finished callback will be called. You can then call g_output_stream_splice_finish() to get the result of the operation.

For the synchronous, blocking version of this function, see g_output_stream_splice().

Parameters:

source - a GInputStream.

flags - a set of GOutputStreamSpliceFlags.

ioPriority - the io priority of the request.

cancellable - optional GCancellable object, null to ignore.

callback - a GAsyncReadyCallback to call when the request is satisfied

spliceFinish

public long spliceFinish(AsyncResult result)
                  throws GErrorException

Finishes an asynchronous stream splice operation.

Parameters:

result - a GAsyncResult.

Returns:

a gssize of the number of bytes spliced. Note that if the number of bytes spliced is greater than G_MAXSSIZE, then that will be returned, and there is no way to determine the actual number of bytes spliced.

Throws:

GErrorException - see GError

write

public long write(byte[] buffer,
 @Nullable
 @Nullable Cancellable cancellable)
           throws GErrorException

Tries to write count bytes from buffer into the stream. Will block during the operation.

If count is 0, returns 0 and does nothing. A value of count larger than G_MAXSSIZE will cause a IOErrorEnum.INVALID_ARGUMENT error.

On success, the number of bytes written to the stream is returned. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, or if there is not enough storage in the stream. All writes block until at least one byte is written or an error occurs; 0 is never returned (unless count is 0).

If cancellable is not null, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error IOErrorEnum.CANCELLED will be returned. If an operation was partially finished when the operation was cancelled the partial result will be returned, without an error.

On error -1 is returned and error is set accordingly.

Parameters:

buffer - the buffer containing the data to write.

cancellable - optional cancellable object

Returns:

Number of bytes written, or -1 on error

Throws:

GErrorException - see GError

writeAll

public boolean writeAll(byte[] buffer,
 @Nullable
 @Nullable Out<Long> bytesWritten,
 @Nullable
 @Nullable Cancellable cancellable)
                 throws GErrorException

Tries to write count bytes from buffer into the stream. Will block during the operation.

This function is similar to g_output_stream_write(), except it tries to write as many bytes as requested, only stopping on an error.

On a successful write of count bytes, true is returned, and bytesWritten is set to count.

If there is an error during the operation false is returned and error is set to indicate the error status.

As a special exception to the normal conventions for functions that use GError, if this function returns false (and sets error) then bytesWritten will be set to the number of bytes that were successfully written before the error was encountered. This functionality is only available from C. If you need it from another language then you must write your own loop around g_output_stream_write().

Parameters:

buffer - the buffer containing the data to write.

bytesWritten - location to store the number of bytes that was written to the stream

cancellable - optional GCancellable object, null to ignore.

Returns:

true on success, false if there was an error

Throws:

GErrorException - see GError

writeAllAsync

public void writeAllAsync(byte[] buffer,
 int ioPriority,
 @Nullable
 @Nullable Cancellable cancellable,
 @Nullable
 @Nullable AsyncReadyCallback callback)

Request an asynchronous write of count bytes from buffer into the stream. When the operation is finished callback will be called. You can then call g_output_stream_write_all_finish() to get the result of the operation.

This is the asynchronous version of g_output_stream_write_all().

Call g_output_stream_write_all_finish() to collect the result.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_PRIORITY_DEFAULT.

Note that no copy of buffer will be made, so it must stay valid until callback is called.

Parameters:

buffer - the buffer containing the data to write

ioPriority - the io priority of the request

cancellable - optional GCancellable object, null to ignore

callback - a GAsyncReadyCallback to call when the request is satisfied

writeAllFinish

public boolean writeAllFinish(AsyncResult result,
 @Nullable
 @Nullable Out<Long> bytesWritten)
                       throws GErrorException

Finishes an asynchronous stream write operation started with g_output_stream_write_all_async().

As a special exception to the normal conventions for functions that use GError, if this function returns false (and sets error) then bytesWritten will be set to the number of bytes that were successfully written before the error was encountered. This functionality is only available from C. If you need it from another language then you must write your own loop around g_output_stream_write_async().

Parameters:

result - a GAsyncResult

bytesWritten - location to store the number of bytes that was written to the stream

Returns:

true on success, false if there was an error

Throws:

GErrorException - see GError

writeAsync

public void writeAsync(byte[] buffer,
 int ioPriority,
 @Nullable
 @Nullable Cancellable cancellable,
 @Nullable
 @Nullable AsyncReadyCallback callback)

Request an asynchronous write of count bytes from buffer into the stream. When the operation is finished callback will be called. You can then call g_output_stream_write_finish() to get the result of the operation.

During an async request no other sync and async calls are allowed, and will result in IOErrorEnum.PENDING errors.

A value of count larger than G_MAXSSIZE will cause a IOErrorEnum.INVALID_ARGUMENT error.

On success, the number of bytes written will be passed to the callback. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, but generally we try to write as many bytes as requested.

You are guaranteed that this method will never fail with IOErrorEnum.WOULD_BLOCK - if this OutputStream can't accept more data, the method will just wait until this changes.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_PRIORITY_DEFAULT.

The asynchronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

For the synchronous, blocking version of this function, see g_output_stream_write().

Note that no copy of buffer will be made, so it must stay valid until callback is called. See g_output_stream_write_bytes_async() for a GBytes version that will automatically hold a reference to the contents (without copying) for the duration of the call.

Parameters:

buffer - the buffer containing the data to write.

ioPriority - the io priority of the request.

cancellable - optional GCancellable object, null to ignore.

callback - a GAsyncReadyCallback to call when the request is satisfied

writeBytes

public long writeBytes(Bytes bytes,
 @Nullable
 @Nullable Cancellable cancellable)
                throws GErrorException

A wrapper function for g_output_stream_write() which takes a GBytes as input. This can be more convenient for use by language bindings or in other cases where the refcounted nature of GBytes is helpful over a bare pointer interface.

However, note that this function may still perform partial writes, just like g_output_stream_write(). If that occurs, to continue writing, you will need to create a new GBytes containing just the remaining bytes, using g_bytes_new_from_bytes(). Passing the same GBytes instance multiple times potentially can result in duplicated data in the output stream.

Parameters:

bytes - the GBytes to write

cancellable - optional cancellable object

Returns:

Number of bytes written, or -1 on error

Throws:

GErrorException - see GError

writeBytesAsync

public void writeBytesAsync(Bytes bytes,
 int ioPriority,
 @Nullable
 @Nullable Cancellable cancellable,
 @Nullable
 @Nullable AsyncReadyCallback callback)

This function is similar to g_output_stream_write_async(), but takes a GBytes as input. Due to the refcounted nature of GBytes, this allows the stream to avoid taking a copy of the data.

However, note that this function may still perform partial writes, just like g_output_stream_write_async(). If that occurs, to continue writing, you will need to create a new GBytes containing just the remaining bytes, using g_bytes_new_from_bytes(). Passing the same GBytes instance multiple times potentially can result in duplicated data in the output stream.

For the synchronous, blocking version of this function, see g_output_stream_write_bytes().

Parameters:

bytes - The bytes to write

ioPriority - the io priority of the request.

cancellable - optional GCancellable object, null to ignore.

callback - a GAsyncReadyCallback to call when the request is satisfied

writeBytesFinish

public long writeBytesFinish(AsyncResult result)
                      throws GErrorException

Finishes a stream write-from-GBytes operation.

Parameters:

result - a GAsyncResult.

Returns:

a gssize containing the number of bytes written to the stream.

Throws:

GErrorException - see GError

writeFinish

public long writeFinish(AsyncResult result)
                 throws GErrorException

Finishes a stream write operation.

Parameters:

result - a GAsyncResult.

Returns:

a gssize containing the number of bytes written to the stream.

Throws:

GErrorException - see GError

writev

public boolean writev(OutputVector[] vectors,
 @Nullable
 @Nullable Out<Long> bytesWritten,
 @Nullable
 @Nullable Cancellable cancellable)
               throws GErrorException

Tries to write the bytes contained in the nVectors vectors into the stream. Will block during the operation.

If nVectors is 0 or the sum of all bytes in vectors is 0, returns 0 and does nothing.

On success, the number of bytes written to the stream is returned. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, or if there is not enough storage in the stream. All writes block until at least one byte is written or an error occurs; 0 is never returned (unless nVectors is 0 or the sum of all bytes in vectors is 0).

If cancellable is not null, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error IOErrorEnum.CANCELLED will be returned. If an operation was partially finished when the operation was cancelled the partial result will be returned, without an error.

Some implementations of g_output_stream_writev() may have limitations on the aggregate buffer size, and will return IOErrorEnum.INVALID_ARGUMENT if these are exceeded. For example, when writing to a local file on UNIX platforms, the aggregate buffer size must not exceed G_MAXSSIZE bytes.

Parameters:

vectors - the buffer containing the GOutputVectors to write.

bytesWritten - location to store the number of bytes that were written to the stream

cancellable - optional cancellable object

Returns:

true on success, false if there was an error

Throws:

GErrorException - see GError

writevAll

public boolean writevAll(OutputVector[] vectors,
 @Nullable
 @Nullable Out<Long> bytesWritten,
 @Nullable
 @Nullable Cancellable cancellable)
                  throws GErrorException

Tries to write the bytes contained in the nVectors vectors into the stream. Will block during the operation.

This function is similar to g_output_stream_writev(), except it tries to write as many bytes as requested, only stopping on an error.

On a successful write of all nVectors vectors, true is returned, and bytesWritten is set to the sum of all the sizes of vectors.

If there is an error during the operation false is returned and error is set to indicate the error status.

As a special exception to the normal conventions for functions that use GError, if this function returns false (and sets error) then bytesWritten will be set to the number of bytes that were successfully written before the error was encountered. This functionality is only available from C. If you need it from another language then you must write your own loop around g_output_stream_write().

The content of the individual elements of vectors might be changed by this function.

Parameters:

vectors - the buffer containing the GOutputVectors to write.

bytesWritten - location to store the number of bytes that were written to the stream

cancellable - optional GCancellable object, null to ignore.

Returns:

true on success, false if there was an error

Throws:

GErrorException - see GError

writevAllAsync

public void writevAllAsync(OutputVector[] vectors,
 int ioPriority,
 @Nullable
 @Nullable Cancellable cancellable,
 @Nullable
 @Nullable AsyncReadyCallback callback)

Request an asynchronous write of the bytes contained in the nVectors vectors into the stream. When the operation is finished callback will be called. You can then call g_output_stream_writev_all_finish() to get the result of the operation.

This is the asynchronous version of g_output_stream_writev_all().

Call g_output_stream_writev_all_finish() to collect the result.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_PRIORITY_DEFAULT.

Note that no copy of vectors will be made, so it must stay valid until callback is called. The content of the individual elements of vectors might be changed by this function.

Parameters:

vectors - the buffer containing the GOutputVectors to write.

ioPriority - the I/O priority of the request

cancellable - optional GCancellable object, null to ignore

callback - a GAsyncReadyCallback to call when the request is satisfied

writevAllFinish

public boolean writevAllFinish(AsyncResult result,
 @Nullable
 @Nullable Out<Long> bytesWritten)
                        throws GErrorException

Finishes an asynchronous stream write operation started with g_output_stream_writev_all_async().

As a special exception to the normal conventions for functions that use GError, if this function returns false (and sets error) then bytesWritten will be set to the number of bytes that were successfully written before the error was encountered. This functionality is only available from C. If you need it from another language then you must write your own loop around g_output_stream_writev_async().

Parameters:

result - a GAsyncResult

bytesWritten - location to store the number of bytes that were written to the stream

Returns:

true on success, false if there was an error

Throws:

GErrorException - see GError

writevAsync

public void writevAsync(OutputVector[] vectors,
 int ioPriority,
 @Nullable
 @Nullable Cancellable cancellable,
 @Nullable
 @Nullable AsyncReadyCallback callback)

Request an asynchronous write of the bytes contained in nVectors vectors into the stream. When the operation is finished callback will be called. You can then call g_output_stream_writev_finish() to get the result of the operation.

During an async request no other sync and async calls are allowed, and will result in IOErrorEnum.PENDING errors.

On success, the number of bytes written will be passed to the callback. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, but generally we try to write as many bytes as requested.

You are guaranteed that this method will never fail with IOErrorEnum.WOULD_BLOCK — if this OutputStream can't accept more data, the method will just wait until this changes.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_PRIORITY_DEFAULT.

The asynchronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

For the synchronous, blocking version of this function, see g_output_stream_writev().

Note that no copy of vectors will be made, so it must stay valid until callback is called.

Parameters:

vectors - the buffer containing the GOutputVectors to write.

ioPriority - the I/O priority of the request.

cancellable - optional GCancellable object, null to ignore.

callback - a GAsyncReadyCallback to call when the request is satisfied

writevFinish

public boolean writevFinish(AsyncResult result,
 @Nullable
 @Nullable Out<Long> bytesWritten)
                     throws GErrorException

Finishes a stream writev operation.

Parameters:

result - a GAsyncResult.

bytesWritten - location to store the number of bytes that were written to the stream

Returns:

true on success, false if there was an error

Throws:

GErrorException - see GError

closeFn

protected boolean closeFn(@Nullable
 @Nullable Cancellable cancellable)
                   throws GErrorException

Throws:

GErrorException

builder

public static OutputStream.Builder<? extends OutputStream.Builder> builder()

A OutputStream.Builder object constructs a OutputStream with the specified properties. Use the various set...() methods to set properties, and finish construction with OutputStream.Builder.build().