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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
/**
* @file
* @short This file is included by qcastingplatform_p.h.
* If you need includes in this file, put them in CasttingPlatform.h, outside of the namespace.
*/
template <typename TSubClass, const bool issueError>
Item CastingPlatform<TSubClass, issueError>::castWithCaster(const Item &sourceValue,
const AtomicCaster::Ptr &caster,
const ReportContext::Ptr &context) const
{
Q_ASSERT(sourceValue);
Q_ASSERT(caster);
Q_ASSERT(context);
const Item retval(caster->castFrom(sourceValue, context));
if(issueError)
{
if(retval.template as<AtomicValue>()->hasError())
{
issueCastError(retval, sourceValue, context);
return Item();
}
else
return retval;
}
else
return retval;
}
template <typename TSubClass, const bool issueError>
Item CastingPlatform<TSubClass, issueError>::cast(const Item &sourceValue,
const ReportContext::Ptr &context) const
{
Q_ASSERT(sourceValue);
Q_ASSERT(context);
Q_ASSERT(targetType());
if(m_caster)
return castWithCaster(sourceValue, m_caster, context);
else
{
bool castImpossible = false;
const AtomicCaster::Ptr caster(locateCaster(sourceValue.type(), context, castImpossible));
if(!issueError && castImpossible)
{
/* If we're supposed to issue an error(issueError) then this
* line will never be reached, because locateCaster() will in
* that case throw. */
return ValidationError::createError();
}
else
return castWithCaster(sourceValue, caster, context);
}
}
template <typename TSubClass, const bool issueError>
bool CastingPlatform<TSubClass, issueError>::prepareCasting(const ReportContext::Ptr &context,
const ItemType::Ptr &sourceType)
{
Q_ASSERT(sourceType);
Q_ASSERT(context);
if(*sourceType == *BuiltinTypes::xsAnyAtomicType ||
*sourceType == *BuiltinTypes::item ||
*sourceType == *CommonSequenceTypes::Empty ||
*sourceType == *BuiltinTypes::numeric)
return true; /* The type could not be narrowed better than xs:anyAtomicType
or numeric at compile time. We'll do lookup at runtime instead. */
bool castImpossible = false;
m_caster = locateCaster(sourceType, context, castImpossible);
return !castImpossible;
}
template <typename TSubClass, const bool issueError>
AtomicCaster::Ptr CastingPlatform<TSubClass, issueError>::locateCaster(const ItemType::Ptr &sourceType,
const ReportContext::Ptr &context,
bool &castImpossible) const
{
Q_ASSERT(sourceType);
Q_ASSERT(targetType());
const AtomicCasterLocator::Ptr locator(static_cast<AtomicType *>(
targetType().data())->casterLocator());
if(!locator)
{
if(issueError)
{
context->error(QtXmlPatterns::tr("No casting is possible with %1 as the target type.")
.arg(formatType(context->namePool(), targetType())),
ReportContext::XPTY0004, static_cast<const TSubClass *>(this));
}
else
castImpossible = true;
return AtomicCaster::Ptr();
}
const AtomicCaster::Ptr caster(static_cast<const AtomicType *>(sourceType.data())->accept(locator, static_cast<const TSubClass *>(this)));
if(!caster)
{
if(issueError)
{
context->error(QtXmlPatterns::tr("It is not possible to cast from %1 to %2.")
.arg(formatType(context->namePool(), sourceType))
.arg(formatType(context->namePool(), targetType())),
ReportContext::XPTY0004, static_cast<const TSubClass *>(this));
}
else
castImpossible = true;
return AtomicCaster::Ptr();
}
return caster;
}
template <typename TSubClass, const bool issueError>
void CastingPlatform<TSubClass, issueError>::checkTargetType(const ReportContext::Ptr &context) const
{
Q_ASSERT(context);
const ItemType::Ptr tType(targetType());
Q_ASSERT(tType);
Q_ASSERT(tType->isAtomicType());
const AtomicType::Ptr asAtomic(tType);
/* This catches casting to xs:NOTATION and xs:anyAtomicType. */
if(asAtomic->isAbstract())
{
context->error(QtXmlPatterns::tr("Casting to %1 is not possible because it "
"is an abstract type, and can therefore never be instantiated.")
.arg(formatType(context->namePool(), tType)),
ReportContext::XPST0080,
static_cast<const TSubClass*>(this));
}
}
template <typename TSubClass, const bool issueError>
void CastingPlatform<TSubClass, issueError>::issueCastError(const Item &validationError,
const Item &sourceValue,
const ReportContext::Ptr &context) const
{
Q_ASSERT(validationError);
Q_ASSERT(context);
Q_ASSERT(validationError.isAtomicValue());
Q_ASSERT(validationError.template as<AtomicValue>()->hasError());
const ValidationError::Ptr err(validationError.template as<ValidationError>());
QString msg(err->message());
if(msg.isNull())
{
msg = QtXmlPatterns::tr("It's not possible to cast the value %1 of type %2 to %3")
.arg(formatData(sourceValue.stringValue()))
.arg(formatType(context->namePool(), sourceValue.type()))
.arg(formatType(context->namePool(), targetType()));
}
else
{
Q_ASSERT(!msg.isEmpty());
msg = QtXmlPatterns::tr("Failure when casting from %1 to %2: %3")
.arg(formatType(context->namePool(), sourceValue.type()))
.arg(formatType(context->namePool(), targetType()))
.arg(msg);
}
/* If m_errorCode is FORG0001, we assume our sub-classer doesn't have a
* special wish about error code, so then we use the error object's code.
*/
context->error(msg, m_errorCode == ReportContext::FORG0001 ? err->errorCode() : m_errorCode,
static_cast<const TSubClass*>(this));
}
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