1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the QtXmlPatterns module of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    27 **

    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

    30 **

    31 **

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    34 **

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    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include <QVariant>

    43 #include <QStringList>

    44 

    45 #include "qanyuri_p.h"

    46 #include "qatomicstring_p.h"

    47 #include "qbuiltintypes_p.h"

    48 #include "qcommonsequencetypes_p.h"

    49 #include "qgenericsequencetype_p.h"

    50 #include "qinteger_p.h"

    51 #include "qitem_p.h"

    52 #include "qsequencetype_p.h"

    53 #include "qvariableloader_p.h"

    54 #include "qxmlquery_p.h"

    55 

    56 QT_BEGIN_NAMESPACE

    57 

    58 namespace QPatternist

    59 {

    60 

    61     class VariantListIterator : public ListIteratorPlatform<QVariant, Item, VariantListIterator>

    62     {

    63     public:

    64         inline VariantListIterator(const QVariantList &list) : ListIteratorPlatform<QVariant, Item, VariantListIterator>(list)

    65         {

    66         }

    67 

    68     private:

    69         friend class ListIteratorPlatform<QVariant, Item, VariantListIterator>;

    70 

    71         inline Item inputToOutputItem(const QVariant &inputType) const

    72         {

    73             return AtomicValue::toXDM(inputType);

    74         }

    75     };

    76 

    77     class StringListIterator : public ListIteratorPlatform<QString, Item, StringListIterator>

    78     {

    79     public:

    80         inline StringListIterator(const QStringList &list) : ListIteratorPlatform<QString, Item, StringListIterator>(list)

    81         {

    82         }

    83 

    84     private:

    85         friend class ListIteratorPlatform<QString, Item, StringListIterator>;

    86 

    87         static inline Item inputToOutputItem(const QString &inputType)

    88         {

    89             return AtomicString::fromValue(inputType);

    90         }

    91     };

    92 

    93     /**

    94      * Takes two DynamicContext instances, and redirects the storage of temporary trees

    95      * to one of them.

    96      *

    97      * @since 4.5

    98      */

    99     class TemporaryTreesRedirectingContext : public DelegatingDynamicContext

   100     {

   101     public:

   102         TemporaryTreesRedirectingContext(const DynamicContext::Ptr &other,

   103                                          const DynamicContext::Ptr &modelStorage) : DelegatingDynamicContext(other)

   104                                                                                   , m_modelStorage(modelStorage)

   105         {

   106             Q_ASSERT(m_modelStorage);

   107         }

   108 

   109         virtual void addNodeModel(const QAbstractXmlNodeModel::Ptr &nodeModel)

   110         {

   111             m_modelStorage->addNodeModel(nodeModel);

   112         }

   113 

   114     private:

   115         const DynamicContext::Ptr m_modelStorage;

   116     };

   117 }

   118 

   119 using namespace QPatternist;

   120 

   121 SequenceType::Ptr VariableLoader::announceExternalVariable(const QXmlName name,

   122                                                            const SequenceType::Ptr &declaredType)

   123 {

   124     Q_UNUSED(declaredType);

   125     const QVariant &variant = m_bindingHash.value(name);

   126 

   127 

   128     if(variant.isNull())

   129         return SequenceType::Ptr();

   130     else if(variant.userType() == qMetaTypeId<QIODevice *>())

   131         return CommonSequenceTypes::ExactlyOneAnyURI;

   132     else if(variant.userType() == qMetaTypeId<QXmlQuery>())

   133     {

   134         const QXmlQuery variableQuery(qVariantValue<QXmlQuery>(variant));

   135         return variableQuery.d->expression()->staticType();

   136     }

   137     else

   138     {

   139         return makeGenericSequenceType(AtomicValue::qtToXDMType(qVariantValue<QXmlItem>(variant)),

   140                                        Cardinality::exactlyOne());

   141     }

   142 }

   143 

   144 Item::Iterator::Ptr VariableLoader::evaluateSequence(const QXmlName name,

   145                                                      const DynamicContext::Ptr &context)

   146 {

   147 

   148     const QVariant &variant = m_bindingHash.value(name);

   149     Q_ASSERT_X(!variant.isNull(), Q_FUNC_INFO,

   150                "We assume that we have a binding.");

   151 

   152     /* Same code as in the default clause below. */

   153     if(variant.userType() == qMetaTypeId<QIODevice *>())

   154         return makeSingletonIterator(itemForName(name));

   155     else if(variant.userType() == qMetaTypeId<QXmlQuery>())

   156     {

   157         const QXmlQuery variableQuery(qVariantValue<QXmlQuery>(variant));

   158 

   159         return variableQuery.d->expression()->evaluateSequence(DynamicContext::Ptr(new TemporaryTreesRedirectingContext(variableQuery.d->dynamicContext(), context)));

   160     }

   161 

   162     const QVariant v(qVariantValue<QXmlItem>(variant).toAtomicValue());

   163 

   164     switch(v.type())

   165     {

   166         case QVariant::StringList:

   167             return Item::Iterator::Ptr(new StringListIterator(v.toStringList()));

   168         case QVariant::List:

   169             return Item::Iterator::Ptr(new VariantListIterator(v.toList()));

   170         default:

   171             return makeSingletonIterator(itemForName(name));

   172     }

   173 }

   174 

   175 Item VariableLoader::itemForName(const QXmlName &name) const

   176 {

   177     const QVariant &variant = m_bindingHash.value(name);

   178 

   179     if(variant.userType() == qMetaTypeId<QIODevice *>())

   180         return Item(AnyURI::fromValue(QLatin1String("tag:trolltech.com,2007:QtXmlPatterns:QIODeviceVariable:") + m_namePool->stringForLocalName(name.localName())));

   181 

   182     const QXmlItem item(qVariantValue<QXmlItem>(variant));

   183 

   184     if(item.isNode())

   185         return Item::fromPublic(item);

   186     else

   187     {

   188         const QVariant atomicValue(item.toAtomicValue());

   189         /* If the atomicValue is null it means it doesn't exist in m_bindingHash, and therefore it must

   190          * be a QIODevice, since Patternist guarantees to only ask for variables that announceExternalVariable()

   191          * has accepted. */

   192         if(atomicValue.isNull())

   193             return Item(AnyURI::fromValue(QLatin1String("tag:trolltech.com,2007:QtXmlPatterns:QIODeviceVariable:") + m_namePool->stringForLocalName(name.localName())));

   194         else

   195             return AtomicValue::toXDM(atomicValue);

   196     }

   197 }

   198 

   199 Item VariableLoader::evaluateSingleton(const QXmlName name,

   200                                        const DynamicContext::Ptr &)

   201 {

   202     return itemForName(name);

   203 }

   204 

   205 bool VariableLoader::isSameType(const QVariant &v1,

   206                                 const QVariant &v2) const

   207 {

   208     /* Are both of type QIODevice *? */

   209     if(v1.userType() == qMetaTypeId<QIODevice *>() && v1.userType() == v2.userType())

   210         return true;

   211 

   212     /* Ok, we have two QXmlItems. */

   213     const QXmlItem i1(qVariantValue<QXmlItem>(v1));

   214     const QXmlItem i2(qVariantValue<QXmlItem>(v2));

   215 

   216     if(i1.isNode())

   217     {

   218         Q_ASSERT(false);

   219         return false;

   220     }

   221     else if(i2.isAtomicValue())

   222         return i1.toAtomicValue().type() == i2.toAtomicValue().type();

   223     else

   224     {

   225         /* One is an atomic, the other is a node or they are null. */

   226         return false;

   227     }

   228 }

   229 

   230 void VariableLoader::removeBinding(const QXmlName &name)

   231 {

   232     m_bindingHash.remove(name);

   233 }

   234 

   235 bool VariableLoader::hasBinding(const QXmlName &name) const

   236 {

   237     return m_bindingHash.contains(name)

   238         || (m_previousLoader && m_previousLoader->hasBinding(name));

   239 }

   240 

   241 QVariant VariableLoader::valueFor(const QXmlName &name) const

   242 {

   243     if(m_bindingHash.contains(name))

   244         return m_bindingHash.value(name);

   245     else if(m_previousLoader)

   246         return m_previousLoader->valueFor(name);

   247     else

   248         return QVariant();

   249 }

   250 

   251 void VariableLoader::addBinding(const QXmlName &name,

   252                                 const QVariant &value)

   253 {

   254     m_bindingHash.insert(name, value);

   255 }

   256 

   257 bool VariableLoader::invalidationRequired(const QXmlName &name,

   258                                           const QVariant &variant) const

   259 {

   260     return hasBinding(name) && !isSameType(valueFor(name), variant);

   261 }

   262 

   263 QT_END_NAMESPACE

   264