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/*
* This file is part of Soprano 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 as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* 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.
*/
#include "sesame2queryresultiteratorbackend.h"
#include "sesame2iterator.h"
#include "sesame2utils.h"
#include "sesame2types.h"
#include "sesame2bindingset.h"
#include "sesame2model.h"
#include "jniwrapper.h"
#include "statement.h"
#include "node.h"
#include <QtCore/QDebug>
#include <QtCore/QStringList>
class Soprano::Sesame2::QueryResultIteratorBackend::Private
{
public:
Private( bool result )
: result( 0 ),
booleanResult( result ),
isTupleResult( false ),
isBooleanResult( true ) {
}
Private( const JObjectRef& result_ )
: result( new Iterator( result_ ) ),
booleanResult( false ),
isBooleanResult( false ) {
isTupleResult = JNIWrapper::instance()->env()->IsInstanceOf( result_,
JNIWrapper::instance()->env()->FindClass( ORG_OPENRDF_QUERY_TUPLEQUERYRESULT ) );
// cache the binding names, it is just simpler
if ( isTupleResult ) {
JObjectRef bindingList = result->callObjectMethod( result->getMethodID( "getBindingNames", "()L"JAVA_UTIL_LIST";" ) );
JNIObjectWrapper listWrapper( bindingList );
Iterator it( listWrapper.callObjectMethod( listWrapper.getMethodID( "iterator", "()L"JAVA_UTIL_ITERATOR";" ) ) );
while ( it.hasNext() ) {
bindingNames.append( JStringRef( it.next() ).toQString() );
}
}
}
Iterator* result;
bool booleanResult;
bool isTupleResult;
bool isBooleanResult;
Statement currentStatement;
BindingSet currentBindings;
QStringList bindingNames;
const Model* model;
};
Soprano::Sesame2::QueryResultIteratorBackend::QueryResultIteratorBackend( const JObjectRef& result, const Model* model )
: d( new Private( result ) )
{
d->model = model;
}
Soprano::Sesame2::QueryResultIteratorBackend::QueryResultIteratorBackend( bool result, const Model* model )
: d( new Private( result ) )
{
d->model = model;
}
Soprano::Sesame2::QueryResultIteratorBackend::~QueryResultIteratorBackend()
{
close();
delete d->result;
delete d;
}
bool Soprano::Sesame2::QueryResultIteratorBackend::next()
{
if ( d->isBooleanResult ) {
return false;
}
if ( d->result->hasNext() ) {
JObjectRef next = d->result->next();
if ( next ) {
if ( d->isTupleResult ) {
d->currentBindings.setObject( next );
}
else {
d->currentStatement = convertStatement( next );
}
return true;
}
}
// if there is an exception d->result returns false and it
// is sufficient to catch it once here
setError( JNIWrapper::instance()->convertAndClearException() );
return false;
}
Soprano::Statement Soprano::Sesame2::QueryResultIteratorBackend::currentStatement() const
{
return d->currentStatement;
}
Soprano::Node Soprano::Sesame2::QueryResultIteratorBackend::binding( const QString &name ) const
{
// make sure we do not crash
if ( d->currentBindings.object() ) {
JObjectRef node = d->currentBindings.getValue( JStringRef( name ) );
setError( JNIWrapper::instance()->convertAndClearException() );
return convertNode( node );
}
else {
setError( "Invalid iterator" );
return Node();
}
}
Soprano::Node Soprano::Sesame2::QueryResultIteratorBackend::binding( int offset ) const
{
return binding( d->bindingNames[offset] );
}
int Soprano::Sesame2::QueryResultIteratorBackend::bindingCount() const
{
return d->bindingNames.count();
}
QStringList Soprano::Sesame2::QueryResultIteratorBackend::bindingNames() const
{
return d->bindingNames;
}
bool Soprano::Sesame2::QueryResultIteratorBackend::isGraph() const
{
return !d->isTupleResult && !d->isBooleanResult;
}
bool Soprano::Sesame2::QueryResultIteratorBackend::isBinding() const
{
return d->isTupleResult;
}
bool Soprano::Sesame2::QueryResultIteratorBackend::isBool() const
{
return d->isBooleanResult;
}
bool Soprano::Sesame2::QueryResultIteratorBackend::boolValue() const
{
return d->booleanResult;
}
void Soprano::Sesame2::QueryResultIteratorBackend::close()
{
if ( d->model ) {
if ( d->result ) {
d->result->close();
}
setError( JNIWrapper::instance()->convertAndClearException() );
d->model->removeIterator( this );
d->model = 0;
}
}
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