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+/* -*- 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 <rtl/ustring.hxx>
+#include <com/sun/star/uno/Sequence.hxx>
+#include <memory>
+
+namespace com::sun::star
+{
+namespace beans
+{
+class XMultiPropertySet;
+}
+namespace beans
+{
+class XPropertySet;
+}
+namespace beans
+{
+class XPropertySetInfo;
+}
+}
+
+/**
+ * The MultiPropertySetHelper performs the following functions:
+ *
+ * Given a list of property names (as char** or OUString*), it can
+ * query an XMultiPropertySet (or XPropertySet) which of these properties
+ * it supports (method hasProperties(...)). The properties *MUST* be
+ * sorted alphabetically.
+ *
+ * Then, the X(Multi)PropertySet can be queried for values, and only
+ * the supported properties are queried. (method getValues(...)) The
+ * values are stored in the helper itself.
+ *
+ * Finally, each property can be queried for existence
+ * (method hasProperty(...)) or its value (method (getValue(...))).
+ *
+ * After some initial preparation (hasProperties, getValues) the
+ * MultiPropertySetHelper can be used similarly to an
+ * XPropertySet in that you can query the values in the places where you
+ * need them. However, if an XMultiPropertySet is supplied, the queries
+ * are more efficient, often significantly so.
+ */
+class MultiPropertySetHelper
+{
+ /// names of all properties
+ std::unique_ptr<OUString[]> pPropertyNames;
+
+ /// length of pPropertyNames array
+ sal_Int16 nLength;
+
+ /// the sequence of property names that the current (multi)
+ /// property set implementation supports
+ css::uno::Sequence<OUString> aPropertySequence;
+
+ /// an array of indices that maps from pPropertyNames indices to
+ /// aPropertySequence indices
+ std::unique_ptr<sal_Int16[]> pSequenceIndex;
+
+ /// the last set of values retrieved by getValues
+ css::uno::Sequence<css::uno::Any> aValues;
+
+ /// result of aValues.getConstArray()
+ const css::uno::Any* pValues;
+
+ /// an empty Any
+ css::uno::Any aEmptyAny;
+
+public:
+ MultiPropertySetHelper(const char** pNames);
+
+ ~MultiPropertySetHelper();
+
+ /**
+ * Call hasPropertiesByName for the provided XPropertySetInfo and build
+ * list of allowed properties.
+ */
+ void hasProperties(const css::uno::Reference<css::beans::XPropertySetInfo>&);
+
+ /**
+ * Return whether hasProperties was called
+ * (i.e. if we are ready to call getValues)
+ */
+ bool checkedProperties();
+
+ /**
+ * Get values from the XMultiPropertySet.
+ *
+ * May only be called after hasProperties() was called for the
+ * appropriate XPropertySetInfo.
+ */
+ void getValues(const css::uno::Reference<css::beans::XMultiPropertySet>&);
+
+ /**
+ * Get values from the XPropertySet. This can be much slower than
+ * getValues( const Reference<XMultiPropertySet& ) and hence
+ * should be avoided.
+ *
+ * May only be called after hasProperties() was called for the
+ * appropriate XPropertySetInfo.
+ */
+ void getValues(const css::uno::Reference<css::beans::XPropertySet>&);
+
+ /**
+ * Get a value from the values array.
+ *
+ * May only be called after getValues() was called.
+ */
+ inline const css::uno::Any& getValue(sal_Int16 nIndex);
+
+ /**
+ * Find out if this property is supported.
+ *
+ * May only be called after hasProperties() was called.
+ */
+ inline bool hasProperty(sal_Int16 nIndex);
+
+ /**
+ * Get a value from the XPropertySet on demand.
+ *
+ * If neither getValues nor getValueOnDemand has been called already
+ * after the last call to resetValues, the values are retrieved
+ * using getValues. Otherwise the value already retrieved is returned.
+ * In case XMultiPropertySet is supported by the XPropertySet and
+ * bTryMult is set, the XMultiPropertySet is used to get the values.
+ *
+ */
+ const css::uno::Any& getValue(sal_Int16 nIndex,
+ const css::uno::Reference<css::beans::XPropertySet>&,
+ bool bTryMulti = false);
+
+ /**
+ * Get a value from the XMultiPropertySet on demand.
+ *
+ * If neither getValues nor getValueOnDemand has been called already
+ * after the last call to resetValues, the values are retrieved
+ * using getValues. Otherwise the value already retrieved is returned.
+ * In case XMultiPropertySet is supported by the XPropertySet,
+ * XMultiPropertySet is used to get the values.
+ *
+ */
+ const css::uno::Any& getValue(sal_Int16 nIndex,
+ const css::uno::Reference<css::beans::XMultiPropertySet>&);
+
+ void resetValues() { pValues = nullptr; }
+};
+
+// inline implementations of the often-called methods getValue and hasProperty:
+
+const css::uno::Any& MultiPropertySetHelper::getValue(sal_Int16 nValueNo)
+{
+ assert(pValues && "called getValue() without calling getValues()");
+ assert(pSequenceIndex && "called getValue() without calling hasProperties()");
+ assert(nValueNo < nLength);
+
+ sal_Int16 nIndex = pSequenceIndex[nValueNo];
+ return (nIndex != -1) ? pValues[nIndex] : aEmptyAny;
+}
+
+bool MultiPropertySetHelper::hasProperty(sal_Int16 nValueNo)
+{
+ assert(pSequenceIndex && "called hasProperty() without calling hasProperties()");
+ assert(nValueNo < nLength);
+
+ return pSequenceIndex[nValueNo] != -1;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */