Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 187 insertions, 0 deletions

diff --git a/xmloff/inc/MultiPropertySetHelper.hxx b/xmloff/inc/MultiPropertySetHelper.hxx
new file mode 100644
index 000000000..ee996422e
--- /dev/null
+++ b/xmloff/inc/MultiPropertySetHelper.hxx
@@ -0,0 +1,187 @@
+/* -*- 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 .
+ */
+#ifndef INCLUDED_XMLOFF_INC_MULTIPROPERTYSETHELPER_HXX
+#define INCLUDED_XMLOFF_INC_MULTIPROPERTYSETHELPER_HXX
+
+#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;
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */