source: trunk/src/xmlpatterns/expr/qcastingplatform.cpp@ 651

Last change on this file since 651 was 651, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.6.2 sources.
File size: 8.7 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation ([email protected])
6**
7** This file is part of the QtXmlPatterns module of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
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12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in
14** a written agreement between you and Nokia.
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
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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.
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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, static_cast<const TSubClass *>(this), targetType()));
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, static_cast<const TSubClass *>(this), targetType());
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,
124 const SourceLocationReflection *const location,
125 const ItemType::Ptr &targetType)
126{
127 Q_ASSERT(sourceType);
128 Q_ASSERT(targetType);
129
130 const AtomicCasterLocator::Ptr locator(static_cast<AtomicType *>(
131 targetType.data())->casterLocator());
132 if(!locator)
133 {
134 if(issueError)
135 {
136 context->error(QtXmlPatterns::tr("No casting is possible with %1 as the target type.")
137 .arg(formatType(context->namePool(), targetType)),
138 ReportContext::XPTY0004, location);
139 }
140 else
141 castImpossible = true;
142
143 return AtomicCaster::Ptr();
144 }
145
146 const AtomicCaster::Ptr caster(static_cast<const AtomicType *>(sourceType.data())->accept(locator, location));
147 if(!caster)
148 {
149 if(issueError)
150 {
151 context->error(QtXmlPatterns::tr("It is not possible to cast from %1 to %2.")
152 .arg(formatType(context->namePool(), sourceType))
153 .arg(formatType(context->namePool(), targetType)),
154 ReportContext::XPTY0004, location);
155 }
156 else
157 castImpossible = true;
158
159 return AtomicCaster::Ptr();
160 }
161
162 return caster;
163}
164
165template <typename TSubClass, const bool issueError>
166void CastingPlatform<TSubClass, issueError>::checkTargetType(const ReportContext::Ptr &context) const
167{
168 Q_ASSERT(context);
169
170 const ItemType::Ptr tType(targetType());
171 Q_ASSERT(tType);
172 Q_ASSERT(tType->isAtomicType());
173 const AtomicType::Ptr asAtomic(tType);
174
175 /* This catches casting to xs:NOTATION and xs:anyAtomicType. */
176 if(asAtomic->isAbstract())
177 {
178 context->error(QtXmlPatterns::tr("Casting to %1 is not possible because it "
179 "is an abstract type, and can therefore never be instantiated.")
180 .arg(formatType(context->namePool(), tType)),
181 ReportContext::XPST0080,
182 static_cast<const TSubClass*>(this));
183 }
184}
185
186template <typename TSubClass, const bool issueError>
187void CastingPlatform<TSubClass, issueError>::issueCastError(const Item &validationError,
188 const Item &sourceValue,
189 const ReportContext::Ptr &context) const
190{
191 Q_ASSERT(validationError);
192 Q_ASSERT(context);
193 Q_ASSERT(validationError.isAtomicValue());
194 Q_ASSERT(validationError.template as<AtomicValue>()->hasError());
195
196 const ValidationError::Ptr err(validationError.template as<ValidationError>());
197 QString msg(err->message());
198
199 if(msg.isNull())
200 {
201 msg = QtXmlPatterns::tr("It's not possible to cast the value %1 of type %2 to %3")
202 .arg(formatData(sourceValue.stringValue()))
203 .arg(formatType(context->namePool(), sourceValue.type()))
204 .arg(formatType(context->namePool(), targetType()));
205 }
206 else
207 {
208 Q_ASSERT(!msg.isEmpty());
209 msg = QtXmlPatterns::tr("Failure when casting from %1 to %2: %3")
210 .arg(formatType(context->namePool(), sourceValue.type()))
211 .arg(formatType(context->namePool(), targetType()))
212 .arg(msg);
213 }
214
215 /* If m_errorCode is FORG0001, we assume our sub-classer doesn't have a
216 * special wish about error code, so then we use the error object's code.
217 */
218 context->error(msg, m_errorCode == ReportContext::FORG0001 ? err->errorCode() : m_errorCode,
219 static_cast<const TSubClass*>(this));
220}
221
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