/usr/include/qgis/qgscacheindex.h is in libqgis-dev 2.4.0-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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qgscacheindex.h
--------------------------------------
Date : 13.2.2013
Copyright : (C) 2013 Matthias Kuhn
Email : matthias dot kuhn at gmx 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. *
* *
***************************************************************************/
#ifndef QGSCACHEINDEX_H
#define QGSCACHEINDEX_H
#include "qgsfeature.h" // QgsFeatureIds
class QgsFeatureRequest;
class QgsFeatureIterator;
/**
* @brief
* Abstract base class for cache indices
*/
class CORE_EXPORT QgsAbstractCacheIndex
{
public:
QgsAbstractCacheIndex();
virtual ~QgsAbstractCacheIndex();
/**
* Is called, whenever a feature is removed from the cache. You should update your indexes, so
* they become invalid in case this feature was required to successfuly answer a request.
*/
virtual void flushFeature( const QgsFeatureId fid ) = 0;
/**
* Sometimes, the whole cache changes its state and its easier to just withdraw everything.
* In this case, this method is issued. Be sure to clear all cache information in here.
*/
virtual void flush() = 0;
/**
* @brief
* Implement this method to update the the indices, in case you need information contained by the request
* to properly index. (E.g. spatial index)
* Does nothing by default
*
* @param featureRequest The feature request that was answered
* @param fids The feature ids that have been returned
*/
virtual void requestCompleted( QgsFeatureRequest featureRequest, QgsFeatureIds fids );
/**
* Is called, when a feature request is issued on a cached layer.
* If this cache index is able to completely answer the feature request, it will return true
* and write the list of feature ids of cached features to cachedFeatures. If it is not able
* it will return false and the cachedFeatures state is undefined.
*
* @param featureIterator A reference to a {@link QgsFeatureIterator}. A valid featureIterator will
* be assigned in case this index is able to answer the request and the return
* value is true.
* @param featureRequest The feature request, for which this index is queried.
*
* @return True, if this index holds the information to answer the request.
*
*/
virtual bool getCacheIterator( QgsFeatureIterator& featureIterator, const QgsFeatureRequest& featureRequest ) = 0;
};
#endif // QGSCACHEINDEX_H
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