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qgsgml.h
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1 /***************************************************************************
2  qgsgml.h
3  ---------------------
4  begin : February 2013
5  copyright : (C) 2013 by Radim Blazek
6  email : radim dot blazek at gmail dot com
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
15 #ifndef QGSGML_H
16 #define QGSGML_H
17 
18 #include <expat.h>
19 #include "qgis.h"
20 #include "qgsapplication.h"
21 #include "qgsdataprovider.h"
22 #include "qgsfeature.h"
23 #include "qgsfield.h"
24 #include "qgslogger.h"
25 #include "qgspoint.h"
26 #include "qgsrectangle.h"
27 
28 #include <QPair>
29 #include <QByteArray>
30 #include <QDomElement>
31 #include <QStringList>
32 #include <QStack>
33 
34 class QgsRectangle;
35 class QgsCoordinateReferenceSystem;
36 
41 class CORE_EXPORT QgsGml : public QObject
42 {
43  Q_OBJECT
44  public:
45  QgsGml(
46  const QString& typeName,
47  const QString& geometryAttribute,
48  const QgsFields & fields );
49 
50  ~QgsGml();
51 
58  int getFeatures( const QString& uri, QGis::WkbType* wkbType, QgsRectangle* extent = 0 );
59 
61  int getFeatures( const QByteArray &data, QGis::WkbType* wkbType, QgsRectangle* extent = 0 );
62 
64  QMap<QgsFeatureId, QgsFeature* > featuresMap() const { return mFeatures; }
65 
67  QMap<QgsFeatureId, QString > idsMap() const { return mIdMap; }
68 
69  private slots:
70 
71  void setFinished();
72 
74  void handleProgressEvent( qint64 progress, qint64 totalSteps );
75 
76  signals:
77  void dataReadProgress( int progress );
78  void totalStepsUpdate( int totalSteps );
79  //also emit signal with progress and totalSteps together (this is better for the status message)
80  void dataProgressAndSteps( int progress, int totalSteps );
81 
82  private:
83 
84  enum ParseMode
85  {
86  none,
87  boundingBox,
88  feature, // feature element containing attrs and geo (inside gml:featureMember)
89  attribute,
90  geometry,
91  coordinate,
92  multiPoint,
93  multiLine,
94  multiPolygon
95  };
96 
98  void startElement( const XML_Char* el, const XML_Char** attr );
99  void endElement( const XML_Char* el );
100  void characters( const XML_Char* chars, int len );
101  static void start( void* data, const XML_Char* el, const XML_Char** attr )
102  {
103  static_cast<QgsGml*>( data )->startElement( el, attr );
104  }
105  static void end( void* data, const XML_Char* el )
106  {
107  static_cast<QgsGml*>( data )->endElement( el );
108  }
109  static void chars( void* data, const XML_Char* chars, int len )
110  {
111  static_cast<QgsGml*>( data )->characters( chars, len );
112  }
113 
114  //helper routines
115 
121  int readEpsgFromAttribute( int& epsgNr, const XML_Char** attr ) const;
127  QString readAttribute( const QString& attributeName, const XML_Char** attr ) const;
130  int createBBoxFromCoordinateString( QgsRectangle &bb, const QString& coordString ) const;
136  int pointsFromCoordinateString( QList<QgsPoint>& points, const QString& coordString ) const;
137 
138  int getPointWKB( unsigned char** wkb, int* size, const QgsPoint& ) const;
139  int getLineWKB( unsigned char** wkb, int* size, const QList<QgsPoint>& lineCoordinates ) const;
140  int getRingWKB( unsigned char** wkb, int* size, const QList<QgsPoint>& ringCoordinates ) const;
146  int createMultiLineFromFragments();
147  int createMultiPointFromFragments();
148  int createPolygonFromFragments();
149  int createMultiPolygonFromFragments();
151  int totalWKBFragmentSize() const;
152 
154  QWidget* findMainWindow() const;
160  void calculateExtentFromFeatures();
161 
163  ParseMode modeStackTop() { return mParseModeStack.isEmpty() ? none : mParseModeStack.top(); }
164 
166  ParseMode modeStackPop() { return mParseModeStack.isEmpty() ? none : mParseModeStack.pop(); }
167 
168  QString mTypeName;
169  QString mUri;
170  //results are members such that handler routines are able to manipulate them
172  QgsRectangle mExtent;
174  //QMap<QgsFeatureId, QgsFeature* > &mFeatures;
175  QMap<QgsFeatureId, QgsFeature* > mFeatures;
176  //QMap<QString, QMap<QgsFeatureId, QgsFeature* > > mFeatures;
177 
179  //QMap<QgsFeatureId, QString > &mIdMap;
180  QMap<QgsFeatureId, QString > mIdMap;
181  //QMap<QString, QMap<QgsFeatureId, QString > > mIdMap;
183  QString mGeometryAttribute;
184  //const QMap<QString, QPair<int, QgsField> > &mThematicAttributes;
185  QMap<QString, QPair<int, QgsField> > mThematicAttributes;
186  QGis::WkbType* mWkbType;
188  bool mFinished;
190  QStack<ParseMode> mParseModeStack;
192  QString mStringCash;
193  QgsFeature* mCurrentFeature;
194  QVector<QVariant> mCurrentAttributes; //attributes of current feature
195  QString mCurrentFeatureId;
196  int mFeatureCount;
198  unsigned char* mCurrentWKB;
200  int mCurrentWKBSize;
201  QgsRectangle mCurrentExtent;
206  QList< QList<unsigned char*> > mCurrentWKBFragments;
208  QList< QList<int> > mCurrentWKBFragmentSizes;
209  QString mAttributeName;
210  QgsApplication::endian_t mEndian;
212  QString mCoordinateSeparator;
214  QString mTupleSeparator;
215 };
216 
217 #endif
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