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This file is part of the Nepomuk KDE project.
Copyright (C) 2007-2010 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_SEARCH_TERM_H_
#define _NEPOMUK_SEARCH_TERM_H_
#include <QtCore/QList>
#include <QtCore/QUrl>
#include <QtCore/QSharedDataPointer>
#include <Soprano/LiteralValue>
#include "nepomukquery_export.h"
namespace Nepomuk {
class Variant;
namespace Types {
class Property;
}
namespace Query {
class LiteralTerm;
class ResourceTerm;
class NegationTerm;
class AndTerm;
class OrTerm;
class ComparisonTerm;
class ResourceTypeTerm;
class OptionalTerm;
class TermPrivate;
/**
* \class Term term.h Nepomuk/Query/Term
*
* \brief The base class for all term types.
*
* Queries are build from Term instances. A Term can have one of multiple
* types and subterms. See Term::Type for details on the different Term types.
*
* \author Sebastian Trueg <trueg@kde.org>
*
* \since 4.4
*/
class NEPOMUKQUERY_EXPORT Term
{
public:
/**
* The type of a term identifying its meaning.
*
* \sa type()
*/
enum Type {
/**
* An invalid term matching nothing
*/
Invalid,
/**
* A literal term is the simplest form of %Term. It simply contains a literal
* value.
*
* \sa LiteralTerm
*/
Literal,
/**
* A resource term matches one resource by URI.
*
* \sa ResourceTerm
*/
Resource,
/**
* Match all resources that match all sub terms.
*
* \sa AndTerm
*/
And,
/**
* Match all resources that match one of the sub terms.
*
* \sa OrTerm
*/
Or,
/**
* A comparison. The comparison operator needs to be specified in addition.
* A single subterm specifies the resource or value to match.
*
* \sa ComparisonTerm
*/
Comparison,
/**
* Matches all resources of a specific type.
*
* \sa ResourceTypeTerm
*/
ResourceType,
/**
* A negation term inverts the meaning of its sub term.
*
* \sa NegationTerm
*/
Negation,
/**
* An optional term which marks its sub term as optional.
*
* \sa OptionalTerm
*
* \since 4.5
*/
Optional
};
/**
* Constructs an invalid term.
*/
Term();
/**
* Copy constructor.
*/
Term( const Term& other );
/**
* Destructor
*/
~Term();
/**
* Copy operator.
*/
Term& operator=( const Term& other );
/**
* \return \p true if the term is valid. A valid
* term can be used to construct a Query.
*/
bool isValid() const;
/**
* \return the Term type.
*/
Type type() const;
/**
* Optimizes the term without changing its meaning. This removes
* redundant terms such as NegationTerm and OptionalTerm nestings and flattens
* AndTerm and OrTerm hierarchies.
*
* \return An optimized version of this term.
*
* \since 4.6
*
* \sa Query::optimized()
*/
Term optimized() const;
/**
* \return \p true if this term is a LiteralTerm.
*/
bool isLiteralTerm() const;
/**
* \return \p true if this term is a ResourceTerm.
*/
bool isResourceTerm() const;
/**
* \return \p true if this term is a NegationTerm.
*/
bool isNegationTerm() const;
/**
* \return \p true if this term is a OptionalTerm.
*
* \since 4.5
*/
bool isOptionalTerm() const;
/**
* \return \p true if this term is an AndTerm.
*/
bool isAndTerm() const;
/**
* \return \p true if this term is an OrTerm.
*/
bool isOrTerm() const;
/**
* \return \p true if this term is a ComparisonTerm.
*/
bool isComparisonTerm() const;
/**
* \return \p true if this term is a ResourceTypeTerm.
*/
bool isResourceTypeTerm() const;
/**
* Interpret this term as a LiteralTerm.
*
* \return A copy of this term if its type
* is Literal, a new LiteralTerm otherwise.
*/
LiteralTerm toLiteralTerm() const;
/**
* Interpret this term as a ResourceTerm.
*
* \return A copy of this term if its type
* is Resource, a new ResourceTerm otherwise.
*/
ResourceTerm toResourceTerm() const;
/**
* Interpret this term as a NegationTerm.
*
* \return A copy of this term if its type
* is Negation, a new NegationTerm otherwise.
*/
NegationTerm toNegationTerm() const;
/**
* Interpret this term as a OptionalTerm.
*
* \return A copy of this term if its type
* is Optional, a new OptionalTerm otherwise.
*
* \since 4.5
*/
OptionalTerm toOptionalTerm() const;
/**
* Interpret this term as a AndTerm.
*
* \return A copy of this term if its type
* is And, a new AndTerm otherwise.
*/
AndTerm toAndTerm() const;
/**
* Interpret this term as a OrTerm.
*
* \return A copy of this term if its type
* is Or, a new OrTerm otherwise.
*/
OrTerm toOrTerm() const;
/**
* Interpret this term as a ComparisonTerm.
*
* \return A copy of this term if its type
* is Comparison, a new ComparisonTerm otherwise.
*/
ComparisonTerm toComparisonTerm() const;
/**
* Interpret this term as a ResourceTypeTerm.
*
* \return A copy of this term if its type
* is ClassType, a new ResourceTypeTerm otherwise.
*/
ResourceTypeTerm toResourceTypeTerm() const;
/**
* Convert this term into a LiteralTerm.
* If type is not Literal it will be changed
* and the result is a new LiteralTerm.
*
* \return A reference to this term as a LiteralTerm.
*/
LiteralTerm& toLiteralTerm();
/**
* Convert this term into a ResourceTerm.
* If type is not Resource it will be changed
* and the result is a new ResourceTerm.
*
* \return A reference to this term as a ResourceTerm.
*/
ResourceTerm& toResourceTerm();
/**
* Convert this term into a NegationTerm.
* If type is not Negation it will be changed
* and the result is a new NegationTerm.
*
* \return A reference to this term as a NegationTerm.
*/
NegationTerm& toNegationTerm();
/**
* Convert this term into a OptionalTerm.
* If type is not Optional it will be changed
* and the result is a new OptionalTerm.
*
* \return A reference to this term as a OptionalTerm.
*
* \since 4.5
*/
OptionalTerm& toOptionalTerm();
/**
* Convert this term into a AndTerm.
* If type is not And it will be changed
* and the result is a new AndTerm.
*
* \return A reference to this term as a AndTerm.
*/
AndTerm& toAndTerm();
/**
* Convert this term into a OrTerm.
* If type is not Or it will be changed
* and the result is a new OrTerm.
*
* \return A reference to this term as a OrTerm.
*/
OrTerm& toOrTerm();
/**
* Convert this term into a ComparisonTerm.
* If type is not Comparison it will be changed
* and the result is a new ComparisonTerm.
*
* \return A reference to this term as a ComparisonTerm.
*/
ComparisonTerm& toComparisonTerm();
/**
* Convert this term into a ResourceTypeTerm.
* If type is not ClassType it will be changed
* and the result is a new ResourceTypeTerm.
*
* \return A reference to this term as a ResourceTypeTerm.
*/
ResourceTypeTerm& toResourceTypeTerm();
/**
* Encode the Term in a string. Be aware that this does NOT create a SPARQL
* query. The returned string can be used to serialize terms that can later
* be read via fromString().
*
* \sa fromString()
*
* \since 4.5
*/
QString toString() const;
/**
* Parse a Term that has been encoded as a string via toString().
*
* \warning This method can NOT parse SPARQL syntax.
*
* \sa toString()
*
* \since 4.5
*/
static Term fromString( const QString& s );
/**
* Construct a Term from a Variant value. This is a convenience method
* that simplifies handling Nepomuk values. However, list variants are
* not supported and will result in an invalid Term.
*
* \return A ResourceTerm in case \p variant is a resource, a LiteralTerm
* if \p variant is a supported literal value, or an invalid Term if \p
* variant is invalid or a list.
*
* \since 4.6
*/
static Term fromVariant( const Variant& variant );
/**
* Create a term using a Types::Property and a Variant. Sadly this cannot be modelled
* as an operator since it would clash with Entity::operator==().
*
* \param property The property to be used in the ComparisonTerm.
* \param variant The value to be compared to. Either ResourceTerm or LiteralTerm is used. List
* variants (Variant::isList()) are handled via an AndTerm meaning all values need to match.
*
* \since 4.6
*
* \relates ComparisonTerm
*/
static Term fromProperty( const Types::Property& property, const Variant& variant );
/**
* Comparison operator.
*
* \return \p true if this term is equal to \p term.
*/
bool operator==( const Term& term ) const;
/**
* Comparison operator.
*
* \return \p true if this term differs from \p term.
*
* \since 4.6
*/
bool operator!=( const Term& term ) const;
// FIXME: the compiler does not find this operator!
QDebug operator<<( QDebug ) const;
/** \cond protected_term_members */
protected:
Term( TermPrivate* );
QSharedDataPointer<TermPrivate> d_ptr;
friend class TermPrivate;
friend class GroupTermPrivate;
friend class AndTermPrivate;
friend class OrTermPrivate;
friend class ComparisonTermPrivate;
friend class NegationTermPrivate;
friend class OptionalTermPrivate;
friend class Query;
friend class QueryPrivate;
/** \endcond */
};
/**
* Logical and operator which combines two terms into
* one term matching both \p term1 and \p term2.
*
* \relates AndTerm
*
* \since 4.6
*/
NEPOMUKQUERY_EXPORT Term operator&&( const Term& term1, const Term& term2 );
/**
* Logical or operator which combines two terms into
* one term matching either \p term1 or \p term2.
*
* \relates OrTerm
*
* \since 4.6
*/
NEPOMUKQUERY_EXPORT Term operator||( const Term& term1, const Term& term2 );
/**
* Logical negation operator which negates the meaning of
* one term.
*
* \sa NegationTerm::negateTerm()
* \relates NegationTerm
*
* \since 4.6
*/
NEPOMUKQUERY_EXPORT Term operator!( const Term& term );
/**
* Comparision operator for simple creation of ComparisonTerm objects using the
* ComparisonTerm::Smaller comparator.
*
* \return A ComparisonTerm equvalent to:
*
* \code
* ComparisonTerm( property, term, ComparisonTerm::Smaller );
* \endcode
*
* \since 4.6
*
* \relates ComparisonTerm
*/
NEPOMUKQUERY_EXPORT ComparisonTerm operator<( const Types::Property& property, const Term& term );
/**
* Comparision operator for simple creation of ComparisonTerm objects using the
* ComparisonTerm::Greater comparator.
*
* \return A ComparisonTerm equvalent to:
*
* \code
* ComparisonTerm( property, term, ComparisonTerm::Greater );
* \endcode
*
* \since 4.6
*
* \relates ComparisonTerm
*/
NEPOMUKQUERY_EXPORT ComparisonTerm operator>( const Types::Property& property, const Term& term );
/**
* Comparision operator for simple creation of ComparisonTerm objects using the
* ComparisonTerm::SmallerOrEqual comparator.
*
* \return A ComparisonTerm equvalent to:
*
* \code
* ComparisonTerm( property, term, ComparisonTerm::SmallerOrEqual );
* \endcode
*
* \since 4.6
*
* \relates ComparisonTerm
*/
NEPOMUKQUERY_EXPORT ComparisonTerm operator<=( const Types::Property& property, const Term& term );
/**
* Comparision operator for simple creation of ComparisonTerm objects using the
* ComparisonTerm::GreaterOrEqual comparator.
*
* \return A ComparisonTerm equvalent to:
*
* \code
* ComparisonTerm( property, term, ComparisonTerm::GreaterOrEqual );
* \endcode
*
* \since 4.6
*
* \relates ComparisonTerm
*/
NEPOMUKQUERY_EXPORT ComparisonTerm operator>=( const Types::Property& property, const Term& term );
/**
* Comparision operator for simple creation of ComparisonTerm objects using the
* ComparisonTerm::Equal comparator.
*
* \return A ComparisonTerm equvalent to:
*
* \code
* ComparisonTerm( property, term, ComparisonTerm::Equal );
* \endcode
*
* \since 4.6
*
* \relates ComparisonTerm
*/
NEPOMUKQUERY_EXPORT ComparisonTerm operator==( const Types::Property& property, const Term& term );
/**
* Comparision operator for simple creation of negated ComparisionTerm objects using the
* ComparisonTerm::Equal comparator.
*
* \since 4.6
*
* \return A Term equvalent to:
*
* \code
* NegationTerm::negateTerm( ComparisonTerm( property, term, ComparisonTerm::Equal ) );
* \endcode
*
* \relates ComparisonTerm
*
* \sa NegationTerm
*/
NEPOMUKQUERY_EXPORT Term operator!=( const Types::Property& property, const Term& term );
NEPOMUKQUERY_EXPORT uint qHash( const Nepomuk::Query::Term& );
}
}
/** \cond hide_nepomuk_term_clone_from_doxygen */
// there is a hand written instantiation of clone()
template<> Nepomuk::Query::TermPrivate* QSharedDataPointer<Nepomuk::Query::TermPrivate>::clone();
/** \endcond */
// FIXME: the compiler does not find the operator in the class
NEPOMUKQUERY_EXPORT QDebug operator<<( QDebug, const Nepomuk::Query::Term& );
#endif
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