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+/****************************************************************************
+**
+** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the $MODULE$ of the Qt Toolkit.
+**
+** $TROLLTECH_DUAL_LICENSE$
+**
+****************************************************************************/
+
+//
+// W A R N I N G
+// -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+
+#ifndef Patternist_XsdIdcHelper_H
+#define Patternist_XsdIdcHelper_H
+
+#include "qreportcontext_p.h"
+#include "qschematype_p.h"
+
+#include <QtXmlPatterns/QXmlItem>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+
+ /**
+ * @short A helper class for validating identity constraints.
+ *
+ * This class represents a field node from the key-sequence as defined in
+ * the validation rules at http://www.w3.org/TR/xmlschema11-1/#d0e32243.
+ */
+ class FieldNode
+ {
+ public:
+ /**
+ * Creates an empty field node.
+ */
+ FieldNode();
+
+ /**
+ * Creates a field node that is bound to a xml node.
+ *
+ * @param item The xml node the field is bound to.
+ * @param data The string content of that field.
+ * @param type The type that is bound to that field.
+ */
+ FieldNode(const QXmlItem &item, const QString &data, const SchemaType::Ptr &type);
+
+ /**
+ * Returns whether this field is empty.
+ *
+ * A field can be empty, if the xpath expression selects an absent attribute
+ * or element.
+ */
+ bool isEmpty() const;
+
+ /**
+ * Returns whether this field is equal to the @p other field.
+ *
+ * Equal means that both have the same type and there content is equal in the
+ * types value space.
+ */
+ bool isEqualTo(const FieldNode &other, const NamePool::Ptr &namePool, const ReportContext::Ptr &context, const SourceLocationReflection *const reflection) const;
+
+ /**
+ * Returns the xml node item the field is bound to.
+ */
+ QXmlItem item() const;
+
+ private:
+ QXmlItem m_item;
+ QString m_data;
+ SchemaType::Ptr m_type;
+ };
+
+ /**
+ * @short A helper class for validating identity constraints.
+ *
+ * This class represents a target or qualified node from the target or qualified
+ * node set as defined in the validation rules at http://www.w3.org/TR/xmlschema11-1/#d0e32243.
+ *
+ * A target node is part of the qualified node set, if all of its fields are not empty.
+ */
+ class TargetNode
+ {
+ public:
+ /**
+ * Defines a set of target nodes.
+ */
+ typedef QSet<TargetNode> Set;
+
+ /**
+ * Creates a new target node that is bound to the xml node @p item.
+ */
+ explicit TargetNode(const QXmlItem &item);
+
+ /**
+ * Returns the xml node item the target node is bound to.
+ */
+ QXmlItem item() const;
+
+ /**
+ * Returns all xml node items, the fields of that target node are bound to.
+ */
+ QVector<QXmlItem> fieldItems() const;
+
+ /**
+ * Returns the number of fields that are empty.
+ */
+ int emptyFieldsCount() const;
+
+ /**
+ * Returns whether the target node has the same fields as the @p other target node.
+ */
+ bool fieldsAreEqual(const TargetNode &other, const NamePool::Ptr &namePool, const ReportContext::Ptr &context, const SourceLocationReflection *const reflection) const;
+
+ /**
+ * Adds a new field to the target node with the given values.
+ */
+ void addField(const QXmlItem &item, const QString &data, const SchemaType::Ptr &type);
+
+ /**
+ * Returns whether the target node is equal to the @p other target node.
+ */
+ bool operator==(const TargetNode &other) const;
+
+ private:
+ QXmlItem m_item;
+ QVector<FieldNode> m_fields;
+ };
+
+ /**
+ * Creates a hash value for the given target @p node.
+ */
+ inline uint qHash(const QPatternist::TargetNode &node)
+ {
+ return qHash(node.item().toNodeModelIndex());
+ }
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif