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qgsconfigcache.cpp
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qgsconfigcache.cpp
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/***************************************************************************
qgsconfigcache.cpp
------------------
begin : July 24th, 2010
copyright : (C) 2010 by Marco Hugentobler
email : marco dot hugentobler at sourcepole dot ch
***************************************************************************/
/***************************************************************************
* *
* 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 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsconfigcache.h"
#include "qgsmapserverlogger.h"
#include "qgsmslayercache.h"
#include "qgsprojectparser.h"
#include "qgssldparser.h"
QgsConfigCache::QgsConfigCache()
{
}
QgsConfigCache::~QgsConfigCache()
{
QMap<QString, QgsConfigParser*>::iterator configIt = mCachedConfigurations.begin();
for ( ; configIt != mCachedConfigurations.end(); ++configIt )
{
delete configIt.value();
}
}
QgsConfigParser* QgsConfigCache::searchConfiguration( const QString& filePath )
{
QgsConfigParser* p = 0;
QMap<QString, QgsConfigParser*>::const_iterator configIt = mCachedConfigurations.find( filePath );
if ( configIt == mCachedConfigurations.constEnd() )
{
QgsMSDebugMsg( "Create new configuration" );
p = insertConfiguration( filePath );
}
else
{
QgsMSDebugMsg( "Return configuration from cache" );
p = configIt.value();
}
if ( p )
{
//there could be more layers in a project than allowed by the cache per default
QgsMSLayerCache::instance()->setProjectMaxLayers( p->numberOfLayers() );
}
return p;
}
QgsConfigParser* QgsConfigCache::insertConfiguration( const QString& filePath )
{
if ( mCachedConfigurations.size() > 40 )
{
//remove 10 elements to avoid memory problems
QMap<QString, QgsConfigParser*>::iterator configIt = mCachedConfigurations.begin();
for ( int i = 0; i < 10; ++i )
{
configIt = mCachedConfigurations.erase( configIt );
}
}
//first open file
QFile* configFile = new QFile( filePath );
if ( !configFile->exists() || !configFile->open( QIODevice::ReadOnly ) )
{
delete configFile;
return 0;
}
//then create xml document
QDomDocument* configDoc = new QDomDocument();
if ( !configDoc->setContent( configFile, true ) )
{
delete configFile;
delete configDoc;
return 0;
}
//is it an sld document or a qgis project file?
QDomElement documentElem = configDoc->documentElement();
QgsConfigParser* configParser = 0;
if ( documentElem.tagName() == "StyledLayerDescriptor" )
{
configParser = new QgsSLDParser( configDoc );
}
else if ( documentElem.tagName() == "qgis" )
{
configParser = new QgsProjectParser( configDoc, filePath );
}
else
{
delete configDoc;
return 0;
}
mCachedConfigurations.insert( filePath, configParser );
delete configFile;
return configParser;
}