source: trunk/src/xmlpatterns/expr/qcastingplatform.cpp@ 395

Last change on this file since 395 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 8.5 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information ([email protected])
5**
6** This file is part of the QtXmlPatterns module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial Usage
10** Licensees holding valid Qt Commercial licenses may use this file in
11** accordance with the Qt Commercial License Agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Nokia.
14**
15** GNU Lesser General Public License Usage
16** Alternatively, this file may be used under the terms of the GNU Lesser
17** General Public License version 2.1 as published by the Free Software
18** Foundation and appearing in the file LICENSE.LGPL included in the
19** packaging of this file. Please review the following information to
20** ensure the GNU Lesser General Public License version 2.1 requirements
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22**
23** In addition, as a special exception, Nokia gives you certain
24** additional rights. These rights are described in the Nokia Qt LGPL
25** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
26** package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
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40****************************************************************************/
41
42/**
43 * @file
44 * @short This file is included by qcastingplatform_p.h.
45 * If you need includes in this file, put them in CasttingPlatform.h, outside of the namespace.
46 */
47
48template <typename TSubClass, const bool issueError>
49Item CastingPlatform<TSubClass, issueError>::castWithCaster(const Item &sourceValue,
50 const AtomicCaster::Ptr &caster,
51 const ReportContext::Ptr &context) const
52{
53 Q_ASSERT(sourceValue);
54 Q_ASSERT(caster);
55 Q_ASSERT(context);
56
57 const Item retval(caster->castFrom(sourceValue, context));
58
59 if(issueError)
60 {
61 if(retval.template as<AtomicValue>()->hasError())
62 {
63 issueCastError(retval, sourceValue, context);
64 return Item();
65 }
66 else
67 return retval;
68 }
69 else
70 return retval;
71}
72
73template <typename TSubClass, const bool issueError>
74Item CastingPlatform<TSubClass, issueError>::cast(const Item &sourceValue,
75 const ReportContext::Ptr &context) const
76{
77 Q_ASSERT(sourceValue);
78 Q_ASSERT(context);
79 Q_ASSERT(targetType());
80
81 if(m_caster)
82 return castWithCaster(sourceValue, m_caster, context);
83 else
84 {
85 bool castImpossible = false;
86 const AtomicCaster::Ptr caster(locateCaster(sourceValue.type(), context, castImpossible));
87
88 if(!issueError && castImpossible)
89 {
90 /* If we're supposed to issue an error(issueError) then this
91 * line will never be reached, because locateCaster() will in
92 * that case throw. */
93 return ValidationError::createError();
94 }
95 else
96 return castWithCaster(sourceValue, caster, context);
97 }
98}
99
100template <typename TSubClass, const bool issueError>
101bool CastingPlatform<TSubClass, issueError>::prepareCasting(const ReportContext::Ptr &context,
102 const ItemType::Ptr &sourceType)
103{
104 Q_ASSERT(sourceType);
105 Q_ASSERT(context);
106
107 if(*sourceType == *BuiltinTypes::xsAnyAtomicType ||
108 *sourceType == *BuiltinTypes::item ||
109 *sourceType == *CommonSequenceTypes::Empty ||
110 *sourceType == *BuiltinTypes::numeric)
111 return true; /* The type could not be narrowed better than xs:anyAtomicType
112 or numeric at compile time. We'll do lookup at runtime instead. */
113
114 bool castImpossible = false;
115 m_caster = locateCaster(sourceType, context, castImpossible);
116
117 return !castImpossible;
118}
119
120template <typename TSubClass, const bool issueError>
121AtomicCaster::Ptr CastingPlatform<TSubClass, issueError>::locateCaster(const ItemType::Ptr &sourceType,
122 const ReportContext::Ptr &context,
123 bool &castImpossible) const
124{
125 Q_ASSERT(sourceType);
126 Q_ASSERT(targetType());
127
128 const AtomicCasterLocator::Ptr locator(static_cast<AtomicType *>(
129 targetType().data())->casterLocator());
130 if(!locator)
131 {
132 if(issueError)
133 {
134 context->error(QtXmlPatterns::tr("No casting is possible with %1 as the target type.")
135 .arg(formatType(context->namePool(), targetType())),
136 ReportContext::XPTY0004, static_cast<const TSubClass *>(this));
137 }
138 else
139 castImpossible = true;
140
141 return AtomicCaster::Ptr();
142 }
143
144 const AtomicCaster::Ptr caster(static_cast<const AtomicType *>(sourceType.data())->accept(locator, static_cast<const TSubClass *>(this)));
145 if(!caster)
146 {
147 if(issueError)
148 {
149 context->error(QtXmlPatterns::tr("It is not possible to cast from %1 to %2.")
150 .arg(formatType(context->namePool(), sourceType))
151 .arg(formatType(context->namePool(), targetType())),
152 ReportContext::XPTY0004, static_cast<const TSubClass *>(this));
153 }
154 else
155 castImpossible = true;
156
157 return AtomicCaster::Ptr();
158 }
159
160 return caster;
161}
162
163template <typename TSubClass, const bool issueError>
164void CastingPlatform<TSubClass, issueError>::checkTargetType(const ReportContext::Ptr &context) const
165{
166 Q_ASSERT(context);
167
168 const ItemType::Ptr tType(targetType());
169 Q_ASSERT(tType);
170 Q_ASSERT(tType->isAtomicType());
171 const AtomicType::Ptr asAtomic(tType);
172
173 /* This catches casting to xs:NOTATION and xs:anyAtomicType. */
174 if(asAtomic->isAbstract())
175 {
176 context->error(QtXmlPatterns::tr("Casting to %1 is not possible because it "
177 "is an abstract type, and can therefore never be instantiated.")
178 .arg(formatType(context->namePool(), tType)),
179 ReportContext::XPST0080,
180 static_cast<const TSubClass*>(this));
181 }
182}
183
184template <typename TSubClass, const bool issueError>
185void CastingPlatform<TSubClass, issueError>::issueCastError(const Item &validationError,
186 const Item &sourceValue,
187 const ReportContext::Ptr &context) const
188{
189 Q_ASSERT(validationError);
190 Q_ASSERT(context);
191 Q_ASSERT(validationError.isAtomicValue());
192 Q_ASSERT(validationError.template as<AtomicValue>()->hasError());
193
194 const ValidationError::Ptr err(validationError.template as<ValidationError>());
195 QString msg(err->message());
196
197 if(msg.isNull())
198 {
199 msg = QtXmlPatterns::tr("It's not possible to cast the value %1 of type %2 to %3")
200 .arg(formatData(sourceValue.stringValue()))
201 .arg(formatType(context->namePool(), sourceValue.type()))
202 .arg(formatType(context->namePool(), targetType()));
203 }
204 else
205 {
206 Q_ASSERT(!msg.isEmpty());
207 msg = QtXmlPatterns::tr("Failure when casting from %1 to %2: %3")
208 .arg(formatType(context->namePool(), sourceValue.type()))
209 .arg(formatType(context->namePool(), targetType()))
210 .arg(msg);
211 }
212
213 /* If m_errorCode is FORG0001, we assume our sub-classer doesn't have a
214 * special wish about error code, so then we use the error object's code.
215 */
216 context->error(msg, m_errorCode == ReportContext::FORG0001 ? err->errorCode() : m_errorCode,
217 static_cast<const TSubClass*>(this));
218}
219
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