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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_UNOTOOLS_CONFIGVALUECONTAINER_HXX
#define INCLUDED_UNOTOOLS_CONFIGVALUECONTAINER_HXX
#include <unotools/unotoolsdllapi.h>
#include <com/sun/star/uno/XComponentContext.hpp>
#include <osl/mutex.hxx>
#include <o3tl/typed_flags_set.hxx>
#include <memory>
enum class CVCFlags
{
LAZY_UPDATE = 0x0000,
UPDATE_ACCESS = 0x0001,
IMMEDIATE_UPDATE = 0x0002,
};
namespace o3tl
{
template<> struct typed_flags<CVCFlags> : is_typed_flags<CVCFlags, 0x03> {};
}
namespace utl
{
struct OConfigurationValueContainerImpl;
struct NodeValueAccessor;
//= OConfigurationValueContainer
/** allows simple access to static configuration structures.
<p>The basic idea of this class is that it's clients (usually derived classes) simply register an
address in memory and a node path, and upon explicit request, the configuration value and the memory
are synchronized.<br/>
This means that when calling <method>read</method>, the current configuration values are copied into
the memory registered for them, and upon calling <method>write</method> the current values in memory
are set in the configuration nodes.</p>
<p>This way, the usage of this class is pretty straight forward: derive your own class, spend some members
to it, and bind these members to configuration node (usually done in the ctor of the derived class).<br/>
In the dtor, simply call <method>write</method> and <method>commit</method>.</p>
<p>There is no auto-commit mechanism in the dtor: In the usual scenario, when you derive from this class
and bind some members of your derived class to config nodes, this means that your members will be destroyed
before your base class' dtor is called, so accessing the memory during such a theoretical auto-commit would
yield undefined behaviour.</p>
*/
class UNOTOOLS_DLLPUBLIC OConfigurationValueContainer
{
private:
std::unique_ptr<OConfigurationValueContainerImpl> m_pImpl;
protected:
// construction/destruction
/** constructs the object
@param _rxORB
specifies the service factory which should be used to access the configuration
@param _rAccessSafety
As this class is intended to manipulate objects it does not hold itself (see the various
registerXXX methods), it needs to guard these access for muti threading safety.<br/>
The mutex given here is locked whenever such an access occurs.
@param _pConfigLocation
is an ASCII string describing the configurations node path
@param _nAccessFlags
specifies different aspects of the configuration aspect to be created, e.g. it's update mode etc.<br/>
See the CVC_xxx constants for what you can use here.
@param _nLevels
specifies the number of levels to access under the node given by <arg>_pConfigLocation</arg>
*/
OConfigurationValueContainer(
const css::uno::Reference< css::uno::XComponentContext >& _rxORB,
::osl::Mutex& _rAccessSafety,
const sal_Char* _pConfigLocation,
const sal_Int32 _nLevels = -1
);
/// dtor
~OConfigurationValueContainer();
// registering data containers
/** registers a data accessor of an arbitrary type.
<p>Usually, in your derived class you simply add a member of the correct type of the configuration
value, and then call this method with the address of this member.</p>
@param _pRelativePathAscii
is a relative (ASCII) path of the node which should be "mirrored" into the accessor.
@param _pContainer
points to the accessors location in memory. Usually, this is simply an address of your derived class
@param _rValueType
is the type of your accessor. This type must be supported by the configuration.
*/
void registerExchangeLocation(
const sal_Char* _pRelativePathAscii,
void* _pContainer,
const css::uno::Type& _rValueType
);
public:
/** reads the configuration data
<p>The current values of the nodes bound (using the registerXXX methods) is copied into their
respective exchange locations.</p>
<p>Please note that any changes done to your exchange locations are overridden with the current config
values.</p>
@see write
*/
void read( );
/** updates the configuration data
<p>The current values in memory (your exchange locations registered using the registerXXX methods) is
forwarded to their respective configuration nodes.</p>
<p>Note that calling <method>write</method>(<sal_True/) is the same as calling <method>commit</method>(<TRUE/>).</p>
@precond
The access must have been created for update access
You must explicitly call <method>commit</method> to make your changes persistent.
@see read
@see commit
*/
void write();
/** commits any changes done
<p>Note that calling <method>write</method>(<sal_True/) is the same as calling <method>commit</method>(<TRUE/>).</p>
@precond
The access must have been created for update access
@param _bWrite
If <TRUE/>, the current values in the exchange locations are written to the configuration nodes
before the changes are committed.<br/>
If <FALSE/>, only the current values in the config nodes (as present since the last call to
<method>write</method>) are committed.
*/
void commit( bool _bWrite = true );
private:
/// implements the ctors
void implConstruct(
const OUString& _rConfigLocation,
const sal_Int32 _nLevels
);
/// registers a value container
void implRegisterExchangeLocation( const NodeValueAccessor& _rAccessor );
};
} // namespace utl
#endif // INCLUDED_UNOTOOLS_CONFIGVALUECONTAINER_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
