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598 lines
20 KiB
C++
598 lines
20 KiB
C++
/***************************************************************************
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qgsgrassprovider.h - Data provider for GRASS format
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-------------------
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begin : March, 2004
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copyright : (C) 2004 by Gary E.Sherman, Radim Blazek
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email : sherman@mrcc.com, blazek@itc.it
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef QGSGRASSPROVIDER_H
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#define QGSGRASSPROVIDER_H
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class QgsFeature;
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class QgsField;
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#include <qdatetime.h>
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#include "../../src/qgsvectordataprovider.h"
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/* Update.
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* Vectors are updated (reloaded) if:
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* 1) Vector was find to be outdated on some occasion. Currently the only occasion is the beginning
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* of QgsGrassProvider::select()
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* Note that if the vector was rewritten by GRASS module and it was not yet updated in QGIS,
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* it should read without problems from old (deleted file), at least on local disk on *nix system.
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* (NFS - cache, Cygwin?)
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*
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* 2) Editing is closed by closeEdit
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*
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* Member variables which must be updated after updateMap() are marked !UPDATE! in this file.
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*/
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/* Editing.
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* If editing is started by startEdit, vector map is reopened in update mode, and GMAP.update
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* is set to true. All data loaded from the map to QgsGrassProvider remain unchanged
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* untill closeEdit is called.
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* During editing:
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* getNextFeature() and getFirstFeature() returns 0
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* featureCount() returns 0
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* fieldCount() returns original (old) number of fields
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*/
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/* Attributes. Cache of database attributes (because selection from database is slow). */
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struct GATT
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{
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int cat; // category
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char **values; // pointer to array of pointers to values
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};
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/* Grass layer (unique vector+field). */
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struct GLAYER
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{
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QString path; // path to the layer gisdbase+location+mapset+mapName
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int field; // field number
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bool valid; // valid is true if layer is opened, once the layer is closed,
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// valid is set to false and no more used
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int mapId; // map ID in maps vector
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struct Map_info *map; // map header
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struct field_info *fieldInfo; // field info
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int nColumns; // number of columns in database table, if 0, attributes are not available
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// and category (column name 'cat') is used instead
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int keyColumn; // number of key column
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std::vector<QgsField> fields; // description of layer fields
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int nAttributes; // number of attributes read to the memory (may be < nRecords)
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GATT *attributes; // vector of attributes
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double (*minmax)[2]; // minimum and maximum values of attributes
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int nUsers; // number of instances using this layer, increased by open(),
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// decreased by close()
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};
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/* Grass vector map. */
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struct GMAP
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{
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QString gisdbase; // map gisdabase
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QString location; // map location name (not path!)
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QString mapset; // map mapset
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QString mapName; // map name
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QString path; // path to the layer gisdbase+location+mapset+mapName
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bool valid; // true if map is opened, once the map is closed,
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// valid is set to false and no more used
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struct Map_info *map; // map header
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int nUsers; // number layers using this map
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int update; // true if the map is opened in update mode -> disabled standard reading
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// through getNextFeature(), featureCount() returns 0
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QDateTime lastModified; // last modified time of the vector directory, when the map was opened
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QDateTime lastAttributesModified; // last modified time of the vector 'dbln' file, when the map was opened
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// or attributes were updated. The 'dbln' file is updated by v.to.db etc.
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// when attributes are changed
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int version; // version, increased by each closeEdit() and updateMap()
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};
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/**
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\class QgsGrassProvider
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\brief Data provider for GRASS vectors
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*/
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class QgsGrassProvider : public QgsVectorDataProvider
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{
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public:
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QgsGrassProvider(QString uri=0);
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virtual ~QgsGrassProvider();
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/** Used to ask the layer for its projection as a WKT string. Implements
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* virtual method of same name in QgsDataProvider. */
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QString getProjectionWKT(void);
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/* Following functions work only until first edit operation! (category index used) */
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/**
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* Get the first feature resulting from a select operation
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* @return QgsFeature
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*/
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QgsFeature * getFirstFeature(bool fetchAttributes=false);
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/**
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* Get the next feature resutling from a select operation
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* @return QgsFeature
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*/
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QgsFeature * getNextFeature(bool fetchAttributes=false);
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bool getNextFeature(QgsFeature &feature, bool fetchAttributes=false);
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QgsFeature* getNextFeature(std::list<int> const & attlist);
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/**
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* Get the feature type as defined in WKBTYPE (qgis.h).
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* @return int representing the feature type
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*/
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int geometryType() const;
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/**
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* Get the number of features in the layer
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*/
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long featureCount() const;
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/**
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* Get the number of fields in the layer
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*/
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int fieldCount() const;
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/**
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* Select features based on a bounding rectangle. Features can be retrieved
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* with calls to getFirstFeature and getNextFeature.
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* @param mbr QgsRect containing the extent to use in selecting features
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*/
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void select(QgsRect *mbr, bool useIntersect=false);
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/**
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* Set the data source specification. This may be a path or database
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* connection string
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* @uri data source specification
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*/
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void setDataSourceUri(QString uri);
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/**
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* Get the data source specification. This may be a path or database
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* connection string
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* @return data source specification
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*/
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QString getDataSourceUri();
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/**
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* Identify features within the search radius specified by rect
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* @param rect Bounding rectangle of search radius
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* @return std::vector containing QgsFeature objects that intersect rect
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*/
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virtual std::vector<QgsFeature>& identify(QgsRect *rect);
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/** Return the extent for this data layer
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*/
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virtual QgsRect *extent();
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/**
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* Get the field information for the layer
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*/
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std::vector<QgsField> const& fields() const;
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/* Reset the layer - for an OGRLayer, this means clearing the
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* spatial filter and calling ResetReading
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*/
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void reset();
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/**Returns the minimum value of an attribut
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@param position the number of the attribute*/
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QString minValue(int position);
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/**Returns the maximum value of an attribut
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@param position the number of the attribute*/
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QString maxValue(int position);
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/** Update (reload) non static members (marked !UPDATE!) from the static layer and the map.
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* This method MUST be called whenever lastUpdate of the map is later then mapLastUpdate
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* of the instance.
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*/
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void update();
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/**Returns true if this is a valid layer
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*/
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bool isValid();
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// ----------------------------------- Edit ----------------------------------
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/** Is the layer editable? I.e. the layer is valid and current user is owner of the mapset
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* @return true the layer editable
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* @return false the is not editable
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*/
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bool isGrassEditable();
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/** Returns true if the layer is currently edited (opened in update mode)
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* @return true in update mode
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* @return false not edited
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*/
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bool isEdited();
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/** Start editing. Reopen the vector for update and set GMAP.update = true
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* @return true success
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* @return false failed to reopen success
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*/
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bool startEdit();
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/** Close editing. Rebuild topology, GMAP.update = false
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* @return true success
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* @return false failed to close vector or vector was not in update mode
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*/
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bool closeEdit();
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/** Get current number of lines.
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* @return number of lines
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*/
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int numLines ( void );
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/** Get current number of nodes.
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* @return number of nodes
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*/
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int numNodes ( void );
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/** Read line
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* @param Points pointer to existing structure or NULL
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* @param Cats pointer to existing structure or NULL
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* @param line line number
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* @return line type
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* @return <0 deadline or error
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*/
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int readLine ( struct line_pnts * Points, struct line_cats * Cats, int line );
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/** Read node coordinates
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* @param line line number
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* @return true node is alive
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* @return false node is dead
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*/
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bool nodeCoor ( int node, double *x, double *y );
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/** Read line nodes
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* @param line line number
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* @return true line is alive
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* @return false line is dead
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*/
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bool lineNodes ( int line, int *node1, int *node2 );
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/** Read boundary areas
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* @param line line number
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* @return true line is alive
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* @return false line is dead
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*/
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bool lineAreas ( int line, int *left, int *right );
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/** Get centroid area
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* @param centroid line number
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* @return area number (negative for island)
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*/
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int centroidArea ( int centroid );
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/** Get number of lines at node
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* @param node node number
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* @return number of lines at node (including dead lines)
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*/
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int nodeNLines ( int node );
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/** Get line number of line at node for given line index
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* @param node node number
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* @param idx line index
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* @return line number
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*/
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int nodeLine ( int node, int idx );
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/** True if line is alive
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* @param line line number
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* @return true alive
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* @return false dead
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*/
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int lineAlive ( int line );
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/** True if node is alive
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* @param node node number
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* @return true alive
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* @return false dead
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*/
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int nodeAlive ( int node );
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/** Write a new line into vector.
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* @return line number
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* @return -1 error
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*/
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int writeLine ( int type, struct line_pnts *Points, struct line_cats *Cats );
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/** Rewrite line.
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* @return line number
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* @return -1 error
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*/
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int rewriteLine ( int line, int type, struct line_pnts *Points, struct line_cats *Cats );
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/** Delete line
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* @return 0 OK
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* @return -1 error
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*/
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int deleteLine ( int line );
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/** Number of updated lines
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*/
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int numUpdatedLines ( void );
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/** Number of updated nodes
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*/
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int numUpdatedNodes ( void );
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/** Get updated line
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*/
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int updatedLine ( int idx );
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/** Get updated node
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*/
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int updatedNode ( int idx );
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/** Find nearest line
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* @param threshold maximum distance
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* @return line number
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* @return 0 nothing found
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*/
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int findLine ( double x, double y, int type, double threshold );
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/** Find nearest node
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* @param threshold maximum distance
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* @return node number
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* @return 0 nothing found
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*/
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int findNode ( double x, double y, double threshold );
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/** Get columns' definitions
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* @param field
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* @param cat
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* @return vector of attributes
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*/
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std::vector<QgsField> *columns ( int field );
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/** Read attributes from DB
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* @param field
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* @param cat
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* @return vector of attributes
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*/
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std::vector<QgsFeatureAttribute> *attributes ( int field, int cat );
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/** Key (cat) column name
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* @param field
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* @return Key column name or empty string
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*/
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QString *key ( int field );
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/** Get number of db links
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* @return number of links
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*/
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int numDbLinks ( void );
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/** Get db link field
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* @param link
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* @return field number or 0
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*/
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int dbLinkField ( int link );
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/** Update attributes
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* @param field
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* @param cat
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* @param update comma separated update string, e.g.: col1 = 5, col2 = 'Val d''Aosta'
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* @return empty string or error message
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*/
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QString *updateAttributes ( int field, int cat, const QString &values );
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/** Insert new attributes to the table (it does not check if attributes already exists)
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* @param field
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* @param cat
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* @return empty string or error message
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*/
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QString *insertAttributes ( int field, int cat );
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/** Create table and link vector to this table
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* @param field
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* @param columns SQL definition for columns, e.g. cat integer, label varchar(10)
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* @return empty string or error message
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*/
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QString *createTable ( int field, const QString &key, const QString &columns );
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/** Add column to table
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* @param field
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* @param column SQL definition for columns, e.g. label varchar(10)
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* @return empty string or error message
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*/
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QString *addColumn ( int field, const QString &column );
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/* Following functions work only until first edit operation! (category index used) */
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/** Get number of fields in category index */
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int cidxGetNumFields ( void );
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/** Get field number for index */
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int cidxGetFieldNumber ( int idx );
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/** Get maximum category for field index */
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int cidxGetMaxCat ( int idx );
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/** get data source uri (not implemented) */
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QgsDataSourceURI * getURI(){ return 0;};
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private:
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// Layer type (layerType)
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enum TYPE { // layer name:
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POINT = 1, // <field>_point
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LINE, // <field>_line
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POLYGON, // <field>_polygon
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BOUNDARY, // boundary (currently not used)
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CENTROID // centroid (currently not used)
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};
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QString mGisdbase; // map gisdabase
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QString mLocation; // map location name (not path!)
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QString mMapset; // map mapset
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QString mMapName; // map name
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QString mLayer; // layer name
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int mLayerField; // field part of layer or -1 if no field specified
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int mLayerType; // layer type POINT, LINE, ...
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int mGrassType; // grass feature type: GV_POINT, GV_LINE | GV_BOUNDARY, GV_AREA,
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// ( GV_BOUNDARY, GV_CENTROID )
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int mQgisType; // WKBPoint, WKBLineString, ...
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int mLayerId; // ID used in layers
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struct Map_info *mMap; // vector header pointer
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int mMapVersion; // The version of the map for which the instance was last time updated
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struct line_pnts *mPoints; // points structure
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struct line_cats *mCats; // cats structure
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struct ilist *mList;
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int mCidxFieldIndex; // !UPDATE! Index for layerField in category index or -1 if no such field
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int mCidxFieldNumCats; // !UPDATE! Number of records in field index
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int mNextCidx; // !UPDATE! Next index in cidxFieldIndex to be read, used to find nextFeature
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// selection: array of size nlines or nareas + 1, set to 1 - selected or 0 - not selected, 2 - read
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// Code 2 means that the line was already read in this cycle, all 2 must be reset to 1
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// if getFirstFeature() or select() is calles.
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// Distinction between 1 and 2 is used if attribute table exists, in that case attributes are
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// read from the table and geometry is append and selection set to 2.
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// In the end the selection array is scanned for 1 (attributes missing), and the geometry
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// is returned without attributes
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char *mSelection; // !UPDATE!
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int mSelectionSize; // !UPDATE! Size of selection array
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QString mDataSourceUri;
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bool mValid; // !UPDATE!
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long mNumberFeatures; // !UPDATE!
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void resetSelection(bool sel); // reset selection
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// -----------------------------------------------------------------------------------------
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/* Static variables and methods.
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* These methods opens GRASS vectors and loads some parts of vectors to the memory.
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* it maintains the list of opened layers so that sources are not duplicated in the memory.
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* Layers are identified by layer ID.
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* The layers have unique URI, if next layer of the same URI is requested,
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* nUsers is increased and ID of the layer which is already opened is returned.
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* Attributes are loaded from DB and stored in the memory when layer is opened.
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*/
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/*! Open layer. Layer for QgsGrassVector means Map+field
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* @param gisdbase
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* @param location
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* @param mapset
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* @param mapName
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* @param field
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* @return layer ID
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* @return -1 cannot open
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*/
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static int openLayer(QString gisdbase, QString location, QString mapset, QString mapName, int field);
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/*! Load sources from the map.
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* Must be set: layer.mapId, layer.map, layer.field
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* Updates: layer.fieldInfo, layer.nColumns, layer.nAttributes, layer.attributes, layer.keyColumn
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* Unchanged: layer.valid
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*
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* Old sources are released, namely: layer.fields and layer.attributes
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*
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* layer.attributes must be pointer to existing array or 0
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*/
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static void loadLayerSourcesFromMap ( GLAYER &layer );
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/*! Load attributes from database table.
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* Must be set: layer.mapId, layer.map, layer.field
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* Updates: layer.fieldInfo, layer.nColumns, layer.nAttributes, layer.attributes, layer.keyColumn
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* Unchanged: layer.valid
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*
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* Old sources are released, namely: layer.attributes
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*
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* layer.attributes must be pointer to existing array or 0
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*/
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static void loadAttributes ( GLAYER &layer );
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/*! Close layer.
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* @param layerId
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*/
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static void closeLayer( int layerId );
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/*! Open map.
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* @param gisdbase
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* @param location
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* @param mapset
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* @param mapName
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* @return map ID
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* @return -1 cannot open
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*/
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static int openMap(QString gisdbase, QString location, QString mapset, QString mapName);
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/*! Close map.
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* @param mapId
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*/
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static void closeMap( int mapId );
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/*! Update map. Close and reopen vector, all layers in mLayers using this map are also updated.
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* Instances of QgsGrassProvider are not updated and should call update() method.
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* @param mapId
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*/
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static void updateMap( int mapId );
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/*! The map is outdated. The map was for example rewritten by GRASS module outside QGIS.
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* This function checks internal timestamp stored in QGIS.
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* @param mapId
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*/
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static bool mapOutdated( int mapId );
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/*! The attributes are outdated. The table was for example updated by GRASS module outside QGIS.
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* This function checks internal timestamp stored in QGIS.
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* @param mapId
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*/
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static bool attributesOutdated( int mapId );
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/*! Allocate sellection array for given map id. The array is large enough for lines or areas
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* (bigger from num lines and num areas)
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* Possible old selection array is not released.
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* @param map pointer to map structure
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* @param selection pointer to pointer to char array
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* @return selection size
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*/
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static int allocateSelection( struct Map_info *map, char **selection );
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/*! Get layer map.
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* @param layerId
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* @return pointer to Map_info structure
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*/
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static struct Map_info *layerMap( int layerId );
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/*! Get attribute by category(key) and attribute number.
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* @param layerId
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* @param category (key)
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* @param column column number ( < nColumns )
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* @return pointer to string representation of the value or NULL, this value must not be changed
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*/
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static char *attribute( int layerId, int cat, int column );
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/*! Set feature attributes.
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* @param layerId
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* @param feature
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* @param cat category number
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*/
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void setFeatureAttributes ( int layerId, int cat, QgsFeature *feature);
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/*! Set feature attributes.
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* @param layerId
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* @param feature
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* @param cat category number
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* @param attlist a list containing the index number of the fields to set
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*/
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void setFeatureAttributes ( int layerId, int cat, QgsFeature *feature, std::list<int> const & attlist);
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/* Static arrays of opened layers and vectors */
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static std::vector<GLAYER> mLayers; // Map + field/attributes
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static std::vector<GMAP> mMaps; // Map
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};
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#endif // QGSGRASSPROVIDER_H
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