1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/***************************************************************************
qgsvectorlayerjoinbuffer.cpp
----------------------------
begin : Feb 09, 2011
copyright : (C) 2011 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 "qgsvectorlayerjoinbuffer.h"
#include "qgsmaplayerregistry.h"
#include "qgsvectordataprovider.h"
#include <QDomElement>
QgsVectorLayerJoinBuffer::QgsVectorLayerJoinBuffer()
{
}
QgsVectorLayerJoinBuffer::~QgsVectorLayerJoinBuffer()
{
}
void QgsVectorLayerJoinBuffer::addJoin( const QgsVectorJoinInfo& joinInfo )
{
mVectorJoins.push_back( joinInfo );
//cache joined layer to virtual memory if specified by user
if ( joinInfo.memoryCache )
{
cacheJoinLayer( mVectorJoins.last() );
}
}
void QgsVectorLayerJoinBuffer::removeJoin( const QString& joinLayerId )
{
for ( int i = 0; i < mVectorJoins.size(); ++i )
{
if ( mVectorJoins.at( i ).joinLayerId == joinLayerId )
{
mVectorJoins.removeAt( i );
}
}
}
void QgsVectorLayerJoinBuffer::cacheJoinLayer( QgsVectorJoinInfo& joinInfo )
{
//memory cache not required or already done
if ( !joinInfo.memoryCache || joinInfo.cachedAttributes.size() > 0 )
{
return;
}
QgsVectorLayer* cacheLayer = dynamic_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( joinInfo.joinLayerId ) );
if ( cacheLayer )
{
int joinFieldIndex;
if ( joinInfo.joinFieldName.isEmpty() )
joinFieldIndex = joinInfo.joinFieldIndex; //for compatibility with 1.x
else
joinFieldIndex = cacheLayer->pendingFields().indexFromName( joinInfo.joinFieldName );
if ( joinFieldIndex < 0 || joinFieldIndex >= cacheLayer->pendingFields().count() )
return;
joinInfo.cachedAttributes.clear();
QgsFeatureIterator fit = cacheLayer->getFeatures( QgsFeatureRequest().setFlags( QgsFeatureRequest::NoGeometry ) );
QgsFeature f;
while ( fit.nextFeature( f ) )
{
const QgsAttributes& attrs = f.attributes();
joinInfo.cachedAttributes.insert( attrs[joinFieldIndex].toString(), attrs );
}
}
}
void QgsVectorLayerJoinBuffer::updateFields( QgsFields& fields )
{
QList< QgsVectorJoinInfo>::const_iterator joinIt = mVectorJoins.constBegin();
for ( int joinIdx = 0 ; joinIt != mVectorJoins.constEnd(); ++joinIt, ++joinIdx )
{
QgsVectorLayer* joinLayer = qobject_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( joinIt->joinLayerId ) );
if ( !joinLayer )
{
continue;
}
const QgsFields& joinFields = joinLayer->pendingFields();
QString joinFieldName;
if ( joinIt->joinFieldName.isEmpty() && joinIt->joinFieldIndex >= 0 && joinIt->joinFieldIndex < joinFields.count() )
joinFieldName = joinFields.field( joinIt->joinFieldIndex ).name(); //for compatibility with 1.x
else
joinFieldName = joinIt->joinFieldName;
for ( int idx = 0; idx < joinFields.count(); ++idx )
{
//skip the join field to avoid double field names (fields often have the same name)
if ( joinFields[idx].name() != joinFieldName )
{
QgsField f = joinFields[idx];
f.setName( joinLayer->name() + "_" + f.name() );
fields.append( f, QgsFields::OriginJoin, idx + ( joinIdx*1000 ) );
}
}
}
}
void QgsVectorLayerJoinBuffer::createJoinCaches()
{
QList< QgsVectorJoinInfo >::iterator joinIt = mVectorJoins.begin();
for ( ; joinIt != mVectorJoins.end(); ++joinIt )
{
cacheJoinLayer( *joinIt );
}
}
void QgsVectorLayerJoinBuffer::writeXml( QDomNode& layer_node, QDomDocument& document ) const
{
QDomElement vectorJoinsElem = document.createElement( "vectorjoins" );
layer_node.appendChild( vectorJoinsElem );
QList< QgsVectorJoinInfo >::const_iterator joinIt = mVectorJoins.constBegin();
for ( ; joinIt != mVectorJoins.constEnd(); ++joinIt )
{
QDomElement joinElem = document.createElement( "join" );
if ( joinIt->targetFieldName.isEmpty() )
joinElem.setAttribute( "targetField", joinIt->targetFieldIndex ); //for compatibility with 1.x
else
joinElem.setAttribute( "targetFieldName", joinIt->targetFieldName );
joinElem.setAttribute( "joinLayerId", joinIt->joinLayerId );
if ( joinIt->joinFieldName.isEmpty() )
joinElem.setAttribute( "joinField", joinIt->joinFieldIndex ); //for compatibility with 1.x
else
joinElem.setAttribute( "joinFieldName", joinIt->joinFieldName );
joinElem.setAttribute( "memoryCache", !joinIt->cachedAttributes.isEmpty() );
vectorJoinsElem.appendChild( joinElem );
}
}
void QgsVectorLayerJoinBuffer::readXml( const QDomNode& layer_node )
{
mVectorJoins.clear();
QDomElement vectorJoinsElem = layer_node.firstChildElement( "vectorjoins" );
if ( !vectorJoinsElem.isNull() )
{
QDomNodeList joinList = vectorJoinsElem.elementsByTagName( "join" );
for ( int i = 0; i < joinList.size(); ++i )
{
QDomElement infoElem = joinList.at( i ).toElement();
QgsVectorJoinInfo info;
info.joinFieldName = infoElem.attribute( "joinFieldName" );
info.joinLayerId = infoElem.attribute( "joinLayerId" );
info.targetFieldName = infoElem.attribute( "targetFieldName" );
info.memoryCache = infoElem.attribute( "memoryCache" ).toInt();
info.joinFieldIndex = infoElem.attribute( "joinField" ).toInt(); //for compatibility with 1.x
info.targetFieldIndex = infoElem.attribute( "targetField" ).toInt(); //for compatibility with 1.x
addJoin( info );
}
}
}
const QgsVectorJoinInfo* QgsVectorLayerJoinBuffer::joinForFieldIndex( int index, const QgsFields& fields, int& sourceFieldIndex ) const
{
if ( fields.fieldOrigin( index ) != QgsFields::OriginJoin )
return 0;
int originIndex = fields.fieldOriginIndex( index );
int sourceJoinIndex = originIndex / 1000;
sourceFieldIndex = originIndex % 1000;
if ( sourceJoinIndex < 0 || sourceJoinIndex >= mVectorJoins.count() )
return 0;
return &( mVectorJoins[sourceJoinIndex] );
}
|
