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| -rw-r--r-- | xmloff/source/chart/MultiPropertySetHandler.hxx | 244 |
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diff --git a/xmloff/source/chart/MultiPropertySetHandler.hxx b/xmloff/source/chart/MultiPropertySetHandler.hxx new file mode 100644 index 000000000..d47b942f0 --- /dev/null +++ b/xmloff/source/chart/MultiPropertySetHandler.hxx @@ -0,0 +1,244 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#pragma once + +#include <map> +#include <memory> +#include <string_view> + +#include <rtl/ustring.hxx> +#include <com/sun/star/beans/XPropertySet.hpp> +#include <com/sun/star/beans/XMultiPropertySet.hpp> + +/** @descr MultiPropertySetHandler handles the two slightly different + interfaces XPropertySet and XMultiPropertySet for accessing + properties of an object. + + It uses the classes PropertyWrapperBase and the template + PropertyWrapper for a type safe access to single properties. + + The function class OUStringComparison is used by a STL map to + sort the properties by names. +*/ + +/** @descr Base class for the templated property wrappers. + Having a common base class allows to set a variable to the + property's value without explicit knowledge of its type. +*/ +class PropertyWrapperBase +{ +public: + /** @descr Create a class instance and store the given name. + @param rName The name of the property. + */ + explicit PropertyWrapperBase (const OUString & rName) + : msName (rName) + {} + virtual ~PropertyWrapperBase() + {} + + /** @descr Abstract interface of a method for setting a variables + value to that of the property. + */ + virtual void SetValue (const css::uno::Any & rValue) = 0; + + const OUString msName; +}; + +/** @descr For every property type there will be one instantiation of this + template class with its own and type specific version of SetValue. +*/ +template<class T> class PropertyWrapper : public PropertyWrapperBase +{ +public: + /** @descr Create a wrapper for a property of type T. + */ + PropertyWrapper (const OUString & rName, T & rValue) + : PropertyWrapperBase (rName), + mrValue (rValue) + {} + + /** descr Set the given value inside an Any to the variable referenced + by the data member. + */ + virtual void SetValue (const css::uno::Any & rValue) override + { + rValue >>= mrValue; + } + +private: + /// Reference to a variable. Its value can be modified by a call to SetValue. + T & mrValue; +}; + +/** @descr Function object for comparing two OUStrings. +*/ +class OUStringComparison +{ +public: + /// Compare two strings. Returns true if the first is before the second. + bool operator() (std::u16string_view a, std::u16string_view b) const + { + return (a.compare (b) < 0); + } +}; + +/** @descr This class lets you get the values from an object that either + supports the interface XPropertySet or XMultiPropertySet. If it + supports both interfaces then XMultiPropertySet is preferred. + + Using it works in three steps. + 1. Create an instance and pass a reference to the object from which to + get the property values. + 2. Make all properties whose values you want to get known to the object + by using the Add method. This creates instances of a template class + that stores the properties name and a reference to the variable in + which to store its value. + 3. Finally call GetProperties to store the properties values into the + variables specified in step 2. This uses either the XPropertySet or + (preferred) the XMultiPropertySet interface. +*/ +class MultiPropertySetHandler +{ +public: + /** @descr Create a handler of the property set of the given + object. + @param xObject A reference to any of the object's interfaces. + not necessarily XPropertySet or XMultiPropertySet. It + is casted later to one of the two of them. + */ + explicit MultiPropertySetHandler (css::uno::Reference< + css::uno::XInterface> const & xObject); + /** @descr Add a property to handle. The type given implicitly by the + reference to a variable is used to create an instance of + the PropertyWrapper template class. + @param sName Name of the property. + @param rValue Reference to a variable whose value is set by the + call to GetProperties to the property's value. + */ + template<class T> void Add (const OUString & sName, T& rValue) + { + aPropertyList[sName] = std::make_unique<PropertyWrapper<T>>(sName, rValue); + } + + /** @descr Try to get the values for all properties added with the Add + method. If possible it uses the XMultiPropertySet. If that fails + (i.e. for an UnknownPropertyExcption) or if the interface is not + supported it uses the XPropertySet interface. + @return If none of the two interfaces is supported or using them both + fails then sal_False is returned. Else True is returned. + */ + inline bool GetProperties(); + +private: + /** @descr Try to use the XMultiPropertySet interface to get the property + values. + @param rNameList A precomputed and sorted sequence of OUStrings + containing the properties names. + @return True if values could be derived. + */ + inline bool MultiGet (const css::uno::Sequence< + OUString> & rNameList); + + /** @descr Try to use the XPropertySet interface to get the property + values. + @param rNameList A precomputed and sorted sequence of OUStrings + containing the properties names. + @return True if values could be derived. + */ + inline bool SingleGet (const css::uno::Sequence< + OUString> & rNameList); + + /** @descr STL map that maps from property names to polymorphic instances of + PropertyWrapper. It uses OUStringComparison for sorting + the property names. + */ + ::std::map< OUString, std::unique_ptr<PropertyWrapperBase>, OUStringComparison> aPropertyList; + + /// The object from which to get the property values. + css::uno::Reference< css::uno::XInterface> mxObject; +}; + +MultiPropertySetHandler::MultiPropertySetHandler (css::uno::Reference< + css::uno::XInterface> const & xObject) + : mxObject (xObject) +{ +} + +bool MultiPropertySetHandler::GetProperties() +{ + css::uno::Sequence< OUString> aNameList (aPropertyList.size()); + auto aNameListRange = asNonConstRange(aNameList); + int i = 0; + for (const auto& rProperty : aPropertyList) + aNameListRange[i++] = rProperty.second->msName; + if ( ! MultiGet(aNameList)) + if ( ! SingleGet(aNameList)) + return false; + return true; +} + +bool MultiPropertySetHandler::MultiGet (const css::uno::Sequence< + OUString> & rNameList) +{ + css::uno::Reference< css::beans::XMultiPropertySet> xMultiSet ( + mxObject, css::uno::UNO_QUERY); + if (xMultiSet.is()) + try + { + int i = 0; + css::uno::Sequence< css::uno::Any> aValueList = + xMultiSet->getPropertyValues (rNameList); + for (auto& rProperty : aPropertyList) + rProperty.second->SetValue (aValueList[i++]); + } + catch (const css::beans::UnknownPropertyException&) + { + return false; + } + else + return false; + + return true; +} + +bool MultiPropertySetHandler::SingleGet (const css::uno::Sequence< + OUString> & rNameList) +{ + css::uno::Reference< css::beans::XPropertySet> xSingleSet ( + mxObject, css::uno::UNO_QUERY); + if (xSingleSet.is()) + try + { + int i = 0; + for (auto& rProperty : aPropertyList) + rProperty.second->SetValue (xSingleSet->getPropertyValue (rNameList[i++])); + } + catch (const css::beans::UnknownPropertyException&) + { + return false; + } + else + return false; + + return true; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |