kicad/common/settings/nested_settings.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2020 Jon Evans <jon@craftyjon.com>
* Copyright (C) 2020 KiCad Developers, see AUTHORS.txt for contributors.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <wx/log.h>
#include <settings/nested_settings.h>
extern const char* traceSettings;
NESTED_SETTINGS::NESTED_SETTINGS( const std::string& aName, int aVersion, JSON_SETTINGS* aParent,
const std::string& aPath ) :
JSON_SETTINGS( aName, SETTINGS_LOC::NESTED, aVersion ),
m_parent( aParent ), m_path( aPath )
{
SetParent( aParent );
}
NESTED_SETTINGS::~NESTED_SETTINGS()
{
if( m_parent )
m_parent->ReleaseNestedSettings( this );
}
bool NESTED_SETTINGS::LoadFromFile( const wxString& aDirectory )
{
clear();
bool success = false;
if( m_parent )
{
nlohmann::json::json_pointer ptr = PointerFromString( m_path );
if( m_parent->contains( ptr ) )
{
try
{
update( ( *m_parent )[ptr] );
wxLogTrace( traceSettings, "Loaded NESTED_SETTINGS %s with schema %d",
GetFilename(), m_schemaVersion );
success = true;
}
catch( ... )
{
wxLogTrace( traceSettings, "NESTED_SETTINGS %s: Could not load from %s at %s",
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m_filename, m_parent->GetFilename(), m_path );
}
}
}
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if( success )
{
int filever = -1;
if( count( PointerFromString( "meta.version" ) ) )
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{
try
{
filever = at( PointerFromString( "meta.version" ) ).get<int>();
}
catch( ... )
{
wxLogTrace( traceSettings, "%s: nested settings version could not be read!",
m_filename );
success = false;
}
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}
else
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{
success = false;
}
if( filever >= 0 && filever < m_schemaVersion )
{
wxLogTrace( traceSettings, "%s: attempting migration from version %d to %d",
m_filename, filever, m_schemaVersion );
if( !Migrate() )
{
wxLogTrace( traceSettings, "%s: migration failed!", GetFullFilename() );
success = false;
}
}
else if( filever > m_schemaVersion )
{
wxLogTrace( traceSettings,
"%s: warning: nested settings version %d is newer than latest (%d)",
m_filename, filever, m_schemaVersion );
}
}
Load();
return success;
}
bool NESTED_SETTINGS::SaveToFile( const wxString& aDirectory, bool aForce )
{
if( !m_parent )
return false;
bool modified = Store();
try
{
nlohmann::json patch =
nlohmann::json::diff( *this, ( *m_parent )[PointerFromString( m_path )] );
modified |= !patch.empty();
}
catch( ... )
{
modified = true;
}
if( !modified && !aForce )
return false;
try
{
( *m_parent )[PointerFromString( m_path ) ].update( *this );
wxLogTrace( traceSettings, "Stored NESTED_SETTINGS %s with schema %d",
GetFilename(), m_schemaVersion );
}
catch( ... )
{
wxLogTrace( traceSettings, "NESTED_SETTINGS %s: Could not store to %s at %s",
m_filename, m_parent->GetFilename(), m_path );
}
return modified;
}
void NESTED_SETTINGS::SetParent( JSON_SETTINGS* aParent )
{
m_parent = aParent;
if( m_parent )
{
m_parent->AddNestedSettings( this );
// In case we were created after the parent's ctor
LoadFromFile();
}
}