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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef __com_sun_star_io_XInputStream_idl__
#define __com_sun_star_io_XInputStream_idl__
#ifndef __com_sun_star_uno_XInterface_idl__
#include <com/sun/star/uno/XInterface.idl>
#endif
#ifndef __com_sun_star_io_NotConnectedException_idl__
#include <com/sun/star/io/NotConnectedException.idl>
#endif
#ifndef __com_sun_star_io_BufferSizeExceededException_idl__
#include <com/sun/star/io/BufferSizeExceededException.idl>
#endif
//=============================================================================
module com { module sun { module star { module io {
//=============================================================================
// DocMerge from xml: interface com::sun::star::io::XInputStream
/** This is the basic interface to read data from a stream.
<p>
See the <a href="http://udk.openoffice.org/common/man/concept/streams.html">
streaming document</a> for further information on chaining and piping streams.
*/
published interface XInputStream: com::sun::star::uno::XInterface
{
//-------------------------------------------------------------------------
// DocMerge from xml: method com::sun::star::io::XInputStream::readBytes
/** reads the specified number of bytes in the given sequence.
<p>The return value specifies the number of bytes which have been
put into the sequence. A difference between <var>nBytesToRead</var>
and the return value indicates that EOF has been reached. This means
that the method blocks until the specified number of bytes are
available or the EOF is reached. </p>
@param aData
after the call, the byte sequence contains the requested number
of bytes (or less as a sign of EOF).
<p>
C++ only : Note that for unbridged (e.g., in-process)
calls, using the same sequence for repetive readBytes()-calls
can bear a performance advantage. The callee can put the data
directly into the sequence so that no buffer reallocation is
necessary.
But this holds only when
<ol>
<li> neither caller nor callee keep a second reference to the same
sequence.
<li> the sequence is pre-allocated with the requested number of bytes.
<li> the same sequence is reused ( simply preallocationg a new
sequence for every call bears no advantage ).
<li> the call is not bridged (e.g., betweeen different compilers
or different processes ).
</ol>
If the same 'optimized' code runs against an interface in a different process,
there is an unnecessary memory allocation/deallocation (the out parameter
is of course NOT transported over the connection), but this should
be negligible compared to a synchron call.
@param nBytesToRead
the total number of bytes to read
*/
long readBytes( [out] sequence<byte> aData,
[in] long nBytesToRead )
raises( com::sun::star::io::NotConnectedException,
com::sun::star::io::BufferSizeExceededException,
com::sun::star::io::IOException);
//-------------------------------------------------------------------------
// DocMerge from xml: method com::sun::star::io::XInputStream::readSomeBytes
/** reads the available number of bytes, at maximum
<var>nMaxBytesToRead</var>.
<p>This method is very similar to the readBytes method, except that
it has different blocking behaviour.
The method blocks as long as at least 1 byte is available or
EOF has been reached. EOF has only been reached, when the method
returns 0 and the corresponding byte sequence is empty.
Otherwise, after the call, aData contains the available,
but no more than nMaxBytesToRead, bytes.
@param aData contains the data read from the stream.
@param nMaxBytesToRead The maximum number of bytes to be read from this
stream during the call.
@see com::sun::star::io::XInputStream::readBytes
*/
long readSomeBytes( [out] sequence<byte> aData,
[in] long nMaxBytesToRead )
raises( com::sun::star::io::NotConnectedException,
com::sun::star::io::BufferSizeExceededException,
com::sun::star::io::IOException );
//-------------------------------------------------------------------------
// DocMerge from xml: method com::sun::star::io::XInputStream::skipBytes
/** skips the next <var>nBytesToSkip</var> bytes (must be positive).
<p>It is up to the implementation whether this method is
blocking the thread or not. </p>
@param nBytesToSkip
number of bytes to skip
*/
void skipBytes( [in] long nBytesToSkip )
raises( com::sun::star::io::NotConnectedException,
com::sun::star::io::BufferSizeExceededException,
com::sun::star::io::IOException );
//-------------------------------------------------------------------------
// DocMerge from xml: method com::sun::star::io::XInputStream::available
/** states how many bytes can be read or skipped without blocking.
<p>Note: This method offers no information on whether the EOF
has been reached. </p>
*/
long available()
raises( com::sun::star::io::NotConnectedException,
com::sun::star::io::IOException
);
//-------------------------------------------------------------------------
// DocMerge from xml: method com::sun::star::io::XInputStream::closeInput
/** closes the stream.
<p>Users must close the stream explicitly when no further
reading should be done. (There may exist ring references to
chained objects that can only be released during this call.
Thus not calling this method would result in a leak of memory or
external resources.) </p>
*/
void closeInput()
raises( com::sun::star::io::NotConnectedException,
com::sun::star::io::IOException);
};
//=============================================================================
}; }; }; };
/*=============================================================================
=============================================================================*/
#endif
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