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qgspluginlayerregistry.cpp
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1 /***************************************************************************
2  qgspluginlayerregistry.cpp - class for
3  registering plugin layer creators
4  -------------------
5  begin : Mon Nov 30 2009
6  copyright : (C) 2009 by Mathias Walker, Sourcepole
7  email : mwa at sourcepole.ch
8  ***************************************************************************/
9 
10 /***************************************************************************
11  * *
12  * This program is free software; you can redistribute it and/or modify *
13  * it under the terms of the GNU General Public License as published by *
14  * the Free Software Foundation; either version 2 of the License, or *
15  * (at your option) any later version. *
16  * *
17  ***************************************************************************/
18 /* $Id$ */
19 
20 #include "qgspluginlayerregistry.h"
21 #include "qgslogger.h"
22 #include "qgspluginlayer.h"
23 #include "qgsmaplayerregistry.h"
24 
26  : mName( name )
27 {
28 }
29 
31 {
32 }
33 
35 {
36  return mName;
37 }
38 
40 {
41  return NULL;
42 }
43 
45 {
46  return false;
47 }
48 
49 //=============================================================================
50 
54 {
55  if ( _instance == NULL )
56  {
58  }
59  return _instance;
60 }
61 
62 
64 {
65 }
66 
68 {
69  if ( !mPluginLayerTypes.isEmpty() )
70  {
71  QgsDebugMsg( "QgsPluginLayerRegistry::~QgsPluginLayerRegistry(): creator list not empty" );
72  foreach( QString typeName, mPluginLayerTypes.keys() )
73  removePluginLayerType( typeName );
74  }
75 }
76 
78 {
79  if ( type == NULL )
80  return false;
81  if ( mPluginLayerTypes.contains( type->name() ) )
82  return false;
83 
84  mPluginLayerTypes[type->name()] = type;
85  return true;
86 }
87 
88 
90 {
91  if ( !mPluginLayerTypes.contains( typeName ) )
92  return false;
93 
94  // remove all remaining layers of this type - to avoid invalid behaviour
95  QList<QgsMapLayer*> layers = QgsMapLayerRegistry::instance()->mapLayers().values();
96  foreach( QgsMapLayer* layer, layers )
97  {
98  if ( layer->type() == QgsMapLayer::PluginLayer )
99  {
100  QgsPluginLayer* pl = qobject_cast<QgsPluginLayer*>( layer );
101  if ( pl->pluginLayerType() == typeName )
102  {
103  QgsMapLayerRegistry::instance()->removeMapLayer( layer->id() );
104  }
105  }
106  }
107 
108  delete mPluginLayerTypes.take( typeName );
109  return true;
110 }
111 
113 {
114  return mPluginLayerTypes.value( typeName, NULL );
115 }
116 
117 
119 {
120  QgsPluginLayerType* type = pluginLayerType( typeName );
121  if ( !type )
122  {
123  QgsDebugMsg( "Unknown plugin layer type: " + typeName );
124  return NULL;
125  }
126 
127  return type->createLayer();
128 }