| 1 | // Copyright (C) 2015 basysKom GmbH, opensource@basyskom.com |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | |
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| 4 | #include "qopcuaelementoperand.h" |
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| 5 | |
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| 6 | QT_BEGIN_NAMESPACE |
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| 7 | |
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| 8 | /*! |
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| 9 | \class QOpcUaElementOperand |
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| 10 | \inmodule QtOpcUa |
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| 11 | \brief The OPC UA ElementOperand type. |
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| 12 | |
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| 13 | The ElementOperand is defined in OPC-UA part 4, 7.4.4.2. |
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| 14 | It is used to identify another element in the filter by its index |
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| 15 | (the first element has the index 0). |
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| 16 | |
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| 17 | This is required to create complex filters, for example to reference |
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| 18 | the two operands of the AND operation in ((Severity > 500) AND (Message == "TestString")). |
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| 19 | The first step is to create content filter elements for the two conditions (Severity > 500) |
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| 20 | and (Message == "TestString"). A third content filter element is required to create an AND |
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| 21 | combination of the two conditions. It consists of the AND operator and two element operands |
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| 22 | with the indices of the two conditions created before: |
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| 23 | |
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| 24 | \code |
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| 25 | QOpcUaMonitoringParameters::EventFilter filter; |
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| 26 | ... |
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| 27 | // setup select clauses |
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| 28 | ... |
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| 29 | QOpcUaContentFilterElement condition1; |
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| 30 | QOpcUaContentFilterElement condition2; |
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| 31 | QOpcUaContentFilterElement condition3; |
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| 32 | condition1 << QOpcUaContentFilterElement::FilterOperator::GreaterThan << QOpcUaSimpleAttributeOperand("Severity") << |
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| 33 | QOpcUaLiteralOperand(quint16(500), QOpcUa::Types::UInt16); |
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| 34 | condition2 << QOpcUaContentFilterElement::FilterOperator::Equals << QOpcUaSimpleAttributeOperand("Message") << |
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| 35 | QOpcUaLiteralOperand("TestString", QOpcUa::Types::String); |
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| 36 | condition3 << QOpcUaContentFilterElement::FilterOperator::And << QOpcUaElementOperand(0) << QOpcUaElementOperand(1); |
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| 37 | filter << condition1 << condition2 << condition3; |
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| 38 | \endcode |
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| 39 | */ |
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| 40 | |
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| 41 | class QOpcUaElementOperandData : public QSharedData |
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| 42 | { |
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| 43 | public: |
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| 44 | quint32 index{0}; |
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| 45 | }; |
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| 46 | |
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| 47 | QOpcUaElementOperand::QOpcUaElementOperand() |
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| 48 | : data(new QOpcUaElementOperandData) |
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| 49 | { |
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| 50 | } |
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| 51 | |
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| 52 | /*! |
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| 53 | Constructs an element operand from \a rhs. |
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| 54 | */ |
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| 55 | QOpcUaElementOperand::QOpcUaElementOperand(const QOpcUaElementOperand &rhs) |
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| 56 | : data(rhs.data) |
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| 57 | { |
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| 58 | } |
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| 59 | |
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| 60 | /*! |
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| 61 | Constructs an element operand with index \a index. |
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| 62 | */ |
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| 63 | QOpcUaElementOperand::QOpcUaElementOperand(quint32 index) |
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| 64 | : data(new QOpcUaElementOperandData) |
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| 65 | { |
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| 66 | setIndex(index); |
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| 67 | } |
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| 68 | |
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| 69 | /*! |
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| 70 | Sets the values from \a rhs in this element operand. |
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| 71 | */ |
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| 72 | QOpcUaElementOperand &QOpcUaElementOperand::operator=(const QOpcUaElementOperand &rhs) |
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| 73 | { |
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| 74 | if (this != &rhs) |
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| 75 | data.operator=(o: rhs.data); |
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| 76 | return *this; |
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| 77 | } |
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| 78 | |
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| 79 | /*! |
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| 80 | Converts this element operand to \l QVariant. |
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| 81 | */ |
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| 82 | QOpcUaElementOperand::operator QVariant() const |
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| 83 | { |
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| 84 | return QVariant::fromValue(value: *this); |
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| 85 | } |
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| 86 | |
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| 87 | QOpcUaElementOperand::~QOpcUaElementOperand() |
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| 88 | { |
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| 89 | } |
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| 90 | |
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| 91 | /*! |
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| 92 | Returns the index of the filter element that is going to be used as operand. |
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| 93 | */ |
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| 94 | quint32 QOpcUaElementOperand::index() const |
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| 95 | { |
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| 96 | return data->index; |
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| 97 | } |
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| 98 | |
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| 99 | /*! |
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| 100 | Sets the index of the filter element that is going to be used as operand to \a index. |
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| 101 | */ |
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| 102 | void QOpcUaElementOperand::setIndex(quint32 index) |
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| 103 | { |
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| 104 | data->index = index; |
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| 105 | } |
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| 106 | |
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| 107 | QT_END_NAMESPACE |
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| 108 | |
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