QGIS API Documentation 3.27.0-Master (f261cc1f8b)
qgsprojectbadlayerhandler.cpp
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1/***************************************************************************
2 qgsprojectbadlayerhandler.cpp - QgsProjectBadLayerHandler
3
4 ---------------------
5 begin : 22.10.2016
6 copyright : (C) 2016 by Matthias Kuhn
8 ***************************************************************************
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. *
14 * *
15 ***************************************************************************/
17#include "qgslogger.h"
18#include "qgsmessagelog.h"
19#include "qgsapplication.h"
20
21#include <QFileInfo>
22
23void QgsProjectBadLayerHandler::handleBadLayers( const QList<QDomNode> &layers )
24{
25 if ( !layers.empty() )
26 QgsMessageLog::logMessage( QObject::tr( "%n unavailable layer(s) found:", nullptr, layers.size() ) );
27
28 for ( const QDomNode &layer : layers )
29 {
30 QgsMessageLog::logMessage( QObject::tr( " * %1" ).arg( dataSource( layer ) ) );
31 }
32}
33
35{
36 const QString type = layerNode.toElement().attribute( QStringLiteral( "type" ) );
37
38 if ( type.isNull() )
39 {
40 QgsDebugMsg( QStringLiteral( "cannot find ``type'' attribute" ) );
41
42 return IS_BOGUS;
43 }
44
45 if ( "raster" == type )
46 {
47 QgsDebugMsgLevel( QStringLiteral( "is a raster" ), 2 );
48
49 return IS_RASTER;
50 }
51 else if ( "vector" == type )
52 {
53 QgsDebugMsgLevel( QStringLiteral( "is a vector" ), 2 );
54
55 return IS_VECTOR;
56 }
57
58 QgsDebugMsgLevel( "is unknown type " + type, 2 );
59
60 return IS_BOGUS;
61}
62
63QString QgsProjectBadLayerHandler::dataSource( const QDomNode &layerNode )
64{
65 const QDomNode dataSourceNode = layerNode.namedItem( QStringLiteral( "datasource" ) );
66
67 if ( dataSourceNode.isNull() )
68 {
69 QgsDebugMsg( QStringLiteral( "cannot find datasource node" ) );
70
71 return QString();
72 }
73
74 return dataSourceNode.toElement().text();
75}
76
78{
79 // XXX but what about rasters that can be URLs? _Can_ they be URLs?
80
81 switch ( dataType( layerNode ) )
82 {
83 case IS_VECTOR:
84 {
85 const QString ds = dataSource( layerNode );
86
87 QgsDebugMsgLevel( "datasource is " + ds, 2 );
88
89 if ( ds.contains( QLatin1String( "host=" ) ) )
90 {
91 return IS_URL;
92 }
93 else if ( ds.contains( QLatin1String( "dbname=" ) ) )
94 {
95 return IS_DATABASE;
96 }
97 // be default, then, this should be a file based layer data source
98 // XXX is this a reasonable assumption?
99
100 return IS_FILE;
101 }
102
103 case IS_RASTER: // rasters are currently only accessed as
104 // physical files
105 return IS_FILE;
106
107 default:
108 QgsDebugMsg( QStringLiteral( "unknown ``type'' attribute" ) );
109 }
110
111 return IS_Unknown;
112}
113
114void QgsProjectBadLayerHandler::setDataSource( QDomNode &layerNode, const QString &dataSource )
115{
116 const QDomNode dataSourceNode = layerNode.namedItem( QStringLiteral( "datasource" ) );
117 const QDomElement dataSourceElement = dataSourceNode.toElement();
118 QDomText dataSourceText = dataSourceElement.firstChild().toText();
119
120 QgsDebugMsgLevel( "datasource changed from " + dataSourceText.data(), 2 );
121
122 dataSourceText.setData( dataSource );
123
124 QgsDebugMsgLevel( "to " + dataSourceText.data(), 2 );
125}
static void logMessage(const QString &message, const QString &tag=QString(), Qgis::MessageLevel level=Qgis::MessageLevel::Warning, bool notifyUser=true)
Adds a message to the log instance (and creates it if necessary).
void setDataSource(QDomNode &layerNode, const QString &dataSource)
Set the datasource element to the new value.
ProviderType
the flavors for data storage
virtual void handleBadLayers(const QList< QDomNode > &layers)
This method will be called whenever the project tries to load layers which cannot be accessed.
ProviderType providerType(const QDomNode &layerNode)
Returns the physical storage type associated with the given layer.
QString dataSource(const QDomNode &layerNode)
Returns the data source for the given layer.
DataType dataType(const QDomNode &layerNode)
Returns data type associated with the given QgsProject file Dom node.
DataType
file data representation
#define QgsDebugMsgLevel(str, level)
Definition: qgslogger.h:39
#define QgsDebugMsg(str)
Definition: qgslogger.h:38