qgsfeature.h

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/***************************************************************************
                      qgsfeature.h - Spatial Feature Class
                     --------------------------------------
Date                 : 09-Sep-2003
Copyright            : (C) 2003 by Gary E.Sherman
email                : sherman at mrcc.com
 ***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef QGSFEATURE_H
#define QGSFEATURE_H

#include <QMap>
#include <QString>
#include <QVariant>
#include <QList>
#include <QHash>
#include <QVector>
#include <QSet>

class QgsGeometry;
class QgsRectangle;
class QgsFeature;
class QgsFields;

// feature id class (currently 64 bit)
#if 0
#include <limits>

class QgsFeatureId
{
  public:
    QgsFeatureId( qint64 id = 0 ) : mId( id ) {}
    QgsFeatureId( QString str ) : mId( str.toLongLong() ) {}
    QgsFeatureId &operator=( const QgsFeatureId &other ) { mId = other.mId; return *this; }
    QgsFeatureId &operator++() { mId++; return *this; }
    QgsFeatureId operator++( int ) { QgsFeatureId pId = mId; ++( *this ); return pId; }

    bool operator==( const QgsFeatureId &id ) const { return mId == id.mId; }
    bool operator!=( const QgsFeatureId &id ) const { return mId != id.mId; }
    bool operator<( const QgsFeatureId &id ) const { return mId < id.mId; }
    bool operator>( const QgsFeatureId &id ) const { return mId > id.mId; }
    operator QString() const { return QString::number( mId ); }

    bool isNew() const
    {
      return mId < 0;
    }

    qint64 toLongLong() const
    {
      return mId;
    }

  private:
    qint64 mId;

    friend uint qHash( const QgsFeatureId &id );
};

inline uint qHash( const QgsFeatureId &id )
{
  return qHash( id.mId );
}

#define FID_IS_NEW(fid)     (fid).isNew()
#define FID_TO_NUMBER(fid)  (fid).toLongLong()
#define FID_TO_STRING(fid)  static_cast<QString>(fid)
#define STRING_TO_FID(str)  QgsFeatureId(str)
#endif

// 64 bit feature ids
#if 1
typedef qint64 QgsFeatureId;
#define FID_IS_NEW(fid)     (fid<0)
#define FID_TO_NUMBER(fid)  static_cast<qint64>(fid)
#define FID_TO_STRING(fid)  QString::number( fid )
#define STRING_TO_FID(str)  (str).toLongLong()
#endif

// 32 bit feature ids
#if 0
typedef int QgsFeatureId;
#define FID_IS_NEW(fid)     (fid<0)
#define FID_TO_NUMBER(fid)  static_cast<int>(fid)
#define FID_TO_STRING(fid)  QString::number( fid )
#define STRING_TO_FID(str)  (str).toLong()
#endif


// key = field index, value = field value
typedef QMap<int, QVariant> QgsAttributeMap;

typedef QVector<QVariant> QgsAttributes;

class QgsField;
typedef QMap<int, QgsField> QgsFieldMap;




class CORE_EXPORT QgsFeature
{
  public:
    QgsFeature( QgsFeatureId id = QgsFeatureId() );

    QgsFeature( const QgsFields& fields, QgsFeatureId id = QgsFeatureId() );

    QgsFeature( const QgsFeature & rhs );

    QgsFeature & operator=( QgsFeature const & rhs );

    ~QgsFeature();

    QgsFeatureId id() const;

    void setFeatureId( QgsFeatureId id );

    const QgsAttributes& attributes() const { return mAttributes; }
    QgsAttributes& attributes() { return mAttributes; }
    void setAttributes( const QgsAttributes& attrs ) { mAttributes = attrs; }

    bool setAttribute( int field, const QVariant& attr );

    void initAttributes( int fieldCount );

    void deleteAttribute( int field );

    bool isValid() const;

    void setValid( bool validity );

    QgsGeometry *geometry() const;

    QgsGeometry *geometryAndOwnership();

    void setGeometry( const QgsGeometry& geom );

    void setGeometry( QgsGeometry* geom );

    void setGeometryAndOwnership( unsigned char * geom, size_t length );

    void setFields( const QgsFields* fields, bool initAttributes = false );

    const QgsFields* fields() const { return mFields; }

    bool setAttribute( const QString& name, QVariant value );

    bool deleteAttribute( const QString& name );

    QVariant attribute( const QString& name ) const;

    QVariant attribute( int fieldIdx ) const;

    int fieldNameIndex( const QString& fieldName ) const;

  private:

    QgsFeatureId mFid;

    QgsAttributes mAttributes;

    QgsGeometry *mGeometry;

    bool mOwnsGeometry;

    bool mValid;

    const QgsFields* mFields;

}; // class QgsFeature

// key = feature id, value = changed attributes
typedef QMap<QgsFeatureId, QgsAttributeMap> QgsChangedAttributesMap;

// key = feature id, value = changed geometry
typedef QMap<QgsFeatureId, QgsGeometry> QgsGeometryMap;

typedef QSet<QgsFeatureId> QgsFeatureIds;

// key = field index, value = field name
typedef QMap<int, QString> QgsFieldNameMap;

typedef QList<QgsFeature> QgsFeatureList;

Q_DECLARE_METATYPE( QgsFeatureList );

#endif