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This file is part of the Nepomuk KDE project.
Copyright (C) 2008-2010 Sebastian Trueg <trueg@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef _NEPOMUK_QUERY_QUERY_H_
#define _NEPOMUK_QUERY_QUERY_H_
#include <QtCore/QSharedDataPointer>
#include <QtCore/QList>
#include <QtCore/QPair>
#include <QtCore/QDebug>
#include <kurl.h>
#include "property.h"
#include "nepomukquery_export.h"
class QTextStream;
namespace Nepomuk {
namespace Query {
class Term;
class QueryPrivate;
class FileQuery;
/**
* \brief Convinience definition for request property mappings as used in
* QueryServiceClient::sparqlQuery() and QueryServiceClient::blockingSparqlQuery().
*/
typedef QHash<QString, Nepomuk::Types::Property> RequestPropertyMap;
/**
* \class Query query.h Nepomuk/Query/Query
*
* \brief A Nepomuk desktop query.
*
* A Query consists or a combination of Terms that can be optionally
* restricted via a limit (setLimit()) or folder filters (setIncludeFolders() and
* setExcludeFolders()).
*
* Additionally setRequestProperties() allows to retrieve additional information
* about the results.
*
* Queries can be easily converted to SPARQL via the toSparqlQuery() method or to
* search URLs ready for KIO::DirLister using toSearchUrl().
*
* The typical usage of a Query instance would be QueryServiceClient::query().
* However one can also use toSparqlQuery() to convert it into a SPARQL query
* string and use that string in QueryServiceClient::sparqlQuery() or even
* directly in Soprano::Model::executeQuery() via \p ResourceManager::instance()->mainModel()
* or in a custom Model.
*
* \sa QueryParser, FileQuery
*
* \author Sebastian Trueg <trueg@kde.org>
*
* \since 4.4
*/
class NEPOMUKQUERY_EXPORT Query
{
public:
/**
* Create an empty invalid query object.
*/
Query();
/**
* Create a query with root term \a term.
*/
explicit Query( const Term& term );
/**
* Copy constructor.
*/
Query( const Query& );
/**
* Destructor
*/
~Query();
/**
* Assignment operator
*/
Query& operator=( const Query& );
/**
* Assignment operator. Assigns \p term to
* this query without changing any other
* properties.
*
* \since 4.5
*/
Query& operator=( const Term& term );
/**
* \return \p true if the query is valid, i.e.
* it has a valid term().
*/
bool isValid() const;
/**
* \return \p true if this is a file query that will
* only return files and folders.
*
* \sa FileQuery
*
* \since 4.5
*/
bool isFileQuery() const;
/**
* \return A copy of this query which is restricted to files.
*
* \since 4.6
*/
FileQuery toFileQuery() const;
/**
* The root term of the query.
* This can be any type of term.
*
* \sa setTerm()
*/
Term term() const;
/**
* The maximum number of results that this query should yield.
*
* \sa setLimit()
*/
int limit() const;
/**
* The first result that should be retrieved.
*
* \sa setOffset()
*
* \since 4.5
*/
int offset() const;
/**
* Set the root term of the query.
*
* \sa term
*/
void setTerm( const Term& );
/**
* Set the maximum number of results this query
* should yield.
*
* \sa limit
*/
void setLimit( int );
/**
* The first result that should be retrieved. This can be combined
* with setLimit() to do paged results.
*
* \since 4.5
*/
void setOffset( int offset );
/**
* %Nepomuk supports scoring the results based on any full text matching
* used in the query (full text matching is done via ComparisonTerm with
* the ComparisonTerm::Contains comperator) and sorting the results based
* on that score.
*
* By default full text scoring is disabled since it can mean a serious
* impact on query performance.
*
* \sa setFullTextScoringSortOrder(), Result::score()
*
* \since 4.6
*/
void setFullTextScoringEnabled( bool enabled );
/**
* Set the full text scoring sort order. Ignored if full text scoring is
* disabled.
*
* By default the sort order is Qt::DescendingOrder.
*
* \sa setFullTextScoringEnabled()
*
* \since 4.6
*/
void setFullTextScoringSortOrder( Qt::SortOrder order );
/**
* \return \p true if full text scoring has been enabled.
*
* \sa setFullTextScoringEnabled()
*
* \since 4.6
*/
bool fullTextScoringEnabled() const;
/**
* \return The full text scoring sort order as set via setFullTextScoringSortOrder()
*
* \since 4.6
*/
Qt::SortOrder fullTextScoringSortOrder() const;
/**
* A set of flags that influence the result of the query.
*
* \sa setQueryFlags(), SparqlFlags
*
* \since 4.6
*/
enum QueryFlag {
/**
* No flags set. This is the default.
*/
NoQueryFlags = 0x0,
/**
* By default queries that will only return results which are intended for
* the user's eyes. In situations where an application needs to work on
* internal or statistical data this restriction is not desireable.
* This flag disables the restriction and returns the full set of results.
*/
NoResultRestrictions = 0x1,
/**
* Disables the return of full text search excerpts for ComparisonTerm::Contains
* terms which are normally reported through Result::excerpt(). It might make sense
* to set this flag in case one has no need for excerpts and does not want to suffer
* the small performance penalty that comes from querying them
*/
WithoutFullTextExcerpt = 0x2
};
Q_DECLARE_FLAGS( QueryFlags, QueryFlag )
/**
* Set the query flags to configure this query.
*
* \sa queryFlags()
*
* \since 4.6
*/
void setQueryFlags( QueryFlags flags );
/**
* Get the query flags to configure this query.
*
* \sa setQueryFlags()
*
* \since 4.6
*/
QueryFlags queryFlags() const;
/**
* \class RequestProperty query.h Nepomuk/Query/Query
*
* \brief A request property can be added to a Query to retrieve
* additional information about the results.
*
* Normally a query would simply yield a list of resources,
* ie. URIs. Using RequestProperty one can request additional
* fields such as the modification time or the label or whatever
* is of interest in the current context.
*
* \sa addRequestProperty, setRequestProperties
*/
class NEPOMUKQUERY_EXPORT RequestProperty {
public:
/**
* Create a new request property.
* \param property The requested %property.
* \param optional if \p true the requested property will
* be %optional, ie. marked as OPTIONAL in SPARQL queries.
*/
RequestProperty( const Nepomuk::Types::Property& property,
bool optional = true );
/**
* Copy constructor.
*/
RequestProperty( const RequestProperty& );
/**
* Destructor.
*/
~RequestProperty();
/**
* Copy operator.
*/
RequestProperty& operator=( const RequestProperty& );
/**
* Comparison operator. Two RequestProperty instances
* are equal if their property() and value of optional()
* are equal.
*/
bool operator==( const RequestProperty& other ) const;
/**
* \return The property set in the constructor.
*/
Nepomuk::Types::Property property() const;
/**
* \return The optional value set in the constructor.
*/
bool optional() const;
private:
class Private;
QSharedDataPointer<Private> d;
};
/**
* Add a property that should be reported with each search result.
*
* \param property The requested property.
*
* ComparisonTerm::setVariableName() provides a more flexible (but also
* slightly more complicated) way to select additional results.
*
* \sa setRequestProperties, requestProperties, ComparisonTerm::setVariableName()
*/
void addRequestProperty( const RequestProperty& property );
/**
* Set the properties that should be reported with each search result.
*
* \param properties The requested properties.
*
* ComparisonTerm::setVariableName() provides a more flexible (but also
* slightly more complicated) way to select additional results.
*
* \sa addRequestProperty, requestProperties, ComparisonTerm::setVariableName()
*/
void setRequestProperties( const QList<RequestProperty>& properties );
/**
* \return The list of RequestProperty instances set via addRequestProperty
* and setRequestProperties.
*/
QList<RequestProperty> requestProperties() const;
/**
* \brief Aditional flags modifying the behaviour of toSparqlQuery() and toSearchUrl().
*/
enum SparqlFlag {
/**
* No flags, i.e. create a default query.
*/
NoFlags = 0x0,
/**
* Create a SPARQL count query which will return the number
* of results rather than the results themselves. The resuling query will have
* a single binding called \p 'cnt'.
*/
CreateCountQuery = 0x1,
/**
* Automatically handle inverse properties, consider for example nie:isPartOf
* and nie:hasPart at the same time and even if only one of both is
* defined.
*/
HandleInverseProperties = 0x2,
/**
* Create a SPARQL ask query which will simply check if a matching result exists.
* Use Soprano::QueryResultIterator::boolValue() to check the result.
*
* \since 4.6
*/
CreateAskQuery = 0x4
};
Q_DECLARE_FLAGS( SparqlFlags, SparqlFlag )
/**
* Convert the query into a SPARQL query which can be used with the
* Nepomuk query service or directly in Soprano::Model::executeQuery.
*
* It is recommended to use QueryServiceClient instead of creating
* the SPARQL query this way.
*
* The resulting query will bind the results to variable \p 'r'. Request
* properties will be bound to variables \p 'reqProp1' through \p 'reqPropN'
* (the only exception is a count query created via the CreateCountQuery flag).
*
* If you are looking for a serialization of a Query which can be parsed again
* use toString() instead.
*
* \warning The SPARQL queries created by this method contain SPARQL extensions
* from Virtuoso and will not work with other RDF storage solutions!
*
* \param flags Optional flags to change the query.
*
* \return The SPARQL representation of this query or an empty string
* if the query could not be converted (invalid query.)
*
* \sa toString(), toSearchUrl(), SparqlFlag
*/
QString toSparqlQuery( SparqlFlags flags = NoFlags ) const;
/**
* Convert the query into a URL which can be listed using KIO::DirLister.
* The URL will use the \p nepomuksearch:/ KIO protocol to handle the listing
* of search results.
*
* \param flags Optional flags to change the query. Query::CreateCountQuery is not
* supported and will silently be dropped from \p flags.
*
* \return A URL which will list a virtual folder containing all search results
* from this query or an invalid URL in case this query is invalid.
*
* \sa toSparqlQuery(), SparqlFlag
*/
KUrl toSearchUrl( SparqlFlags flags = NoFlags ) const;
/**
* Convert the query into a URL which can be listed using KIO::DirLister.
* The URL will use the \p nepomuksearch:/ KIO protocol to handle the listing
* of search results.
*
* This is the perfect method for listing results in file managers or file
* dialogs.
*
* \param customTitle An optional custom title that will be used for the listing
* of the results. This is achieved by setting the KIO::UDSEntry::UDS_DISPLAY_NAME to
* the customTitle value.
* \param flags Optional flags to change the query. Query::CreateCountQuery is not
* supported and will silently be dropped from \p flags.
*
* \return A URL which will list a virtual folder containing all search results
* from this query or an invalid URL in case this query is invalid.
*
* \sa toSparqlQuery(), SparqlFlag
*
* \since 4.5
*/
KUrl toSearchUrl( const QString& customTitle, SparqlFlags flags = NoFlags ) const;
/**
* Build a request property map as used in QueryServiceClient::sparqlQuery()
* from the request properties set via addRequestProperty() and setRequestProperties().
*
* Be aware that in most situations it is much simpler to use QueryServiceClient::query().
*/
RequestPropertyMap requestPropertyMap() const;
/**
* Comparison operator.
*
* \return \p true if this query is equal to \p query.
*/
bool operator==( const Query& query ) const;
/**
* Comparison operator.
*
* \return \p true if this query differs from \p query.
*
* \since 4.6
*/
bool operator!=( const Query& query ) const;
/**
* Optimizes the query without chaning its meaning. This removes
* redundant terms such as NegationTerm and OptionalTerm nestings and flattens
* AndTerm and OrTerm hierarchies.
*
* \return An optimized version of this query.
*
* \since 4.6
*
* \sa Term::optimized()
*/
Query optimized() const;
/**
* Encode the Query in a string. Be aware that this does NOT create a SPARQL
* query. The returned string can be used to serialize queries that can later
* be read via fromString().
*
* \sa fromString(), toSparqlQuery()
*
* \since 4.5
*/
QString toString() const;
/**
* Parse a Query that has been encoded as a string via toString().
*
* \warning This method can NOT parse SPARQL syntax.
*
* \sa toString()
*
* \since 4.5
*/
static Query fromString( const QString& queryString );
/**
* Extract a query from a nepomuksearch:/ query URL.
*
* \return The query that was encoded in \p url or an invalid query if
* either \p url is not a nepomuksearch:/ URL or if it contains a pure SPARQL
* query. In the latter case sparqlFromQueryUrl() can be used to extract that
* query.
*
* \sa sparqlFromQueryUrl()
*
* \since 4.5
*/
static Query fromQueryUrl( const KUrl& url );
/**
* Extract the SPARQL query from a nepomuksearch:/ query URL. All kinds of
* nepomuksearch:/ URLs are supported.
*
* \return The SPARQL query string representing the query encoded
* in \p url.
*
* \sa fromQueryUrl()
*
* \since 4.5
*/
static QString sparqlFromQueryUrl( const KUrl& url );
/**
* Extact the title from a nepomuksearch:/ query URL. The title
* is either a custom title which has been specified in
* toSearchUrl(const QString&, SparqlFlags) or the user query string
* in case of nepomuksearch:/myquery URLs.
*
* \return A title for the query \p url or an empty string
* in case \p url is not a nepomuksearch:/ URL or a useful title
* cannot be extracted.
*
* \since 4.5
*/
static QString titleFromQueryUrl( const KUrl& url );
protected:
/** \cond protected_query_members */
QSharedDataPointer<QueryPrivate> d;
/** \endcond */
};
/**
* Logical and operator which combines \p term into the term
* of \p query to match both.
*
* \sa AndTerm
*
* \since 4.6
*/
NEPOMUKQUERY_EXPORT Query operator&&( const Query& query, const Term& term );
/**
* Logical or operator which combines \p term into the term
* of \p query to match either one.
*
* \sa OrTerm
*
* \since 4.6
*/
NEPOMUKQUERY_EXPORT Query operator||( const Query& query, const Term& term );
/**
* Logical negation operator which negates the meaning of
* a query.
*
* \sa NegationTerm::negateTerm()
*
* \since 4.6
*/
NEPOMUKQUERY_EXPORT Query operator!( const Query& query );
NEPOMUKQUERY_EXPORT uint qHash( const Nepomuk::Query::Query& );
}
}
Q_DECLARE_OPERATORS_FOR_FLAGS( Nepomuk::Query::Query::SparqlFlags )
Q_DECLARE_OPERATORS_FOR_FLAGS( Nepomuk::Query::Query::QueryFlags )
NEPOMUKQUERY_EXPORT QDebug operator<<( QDebug, const Nepomuk::Query::Query& );
#endif
|