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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org. If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef _COMPHELPER_OPTIONALVALUE_HXX
+#define _COMPHELPER_OPTIONALVALUE_HXX
+
+#include <com/sun/star/uno/Any.hxx>
+
+namespace comphelper
+{
+
+/** @deprecated
+ Use boost/optional.hpp instead.
+*/
+
+
+
+ /* Definition of OptionalValue template */
+
+ /** This template provides 'optionality' for the given value type.
+
+ Especially for PODs, optionality either needs to be achieved
+ by special 'magic' values (i.e. an int value is not set when
+ -1 etc.), or an additional bool denoting value
+ validity. This template encapsulates the latter into an atomic
+ data type.
+
+ @tpl Element
+ The value type that should be made optional
+ */
+ template< typename Element > class OptionalValue
+ {
+ public:
+ typedef Element ValueType;
+
+ /** Default-construct the value.
+
+ A default-constructed value is not valid. You have to
+ explicitely set a value.
+ */
+ OptionalValue() :
+ maValue(),
+ mbValid( false )
+ {
+ }
+
+ /** Construct the value.
+
+ An explicitely constructed value is valid. To create an
+ invalid value, you have to default-construct it.
+ */
+ OptionalValue( const Element& rValue ) :
+ maValue( rValue ),
+ mbValid( true )
+ {
+ }
+
+ // default copy/assignment operators are okay here
+ //OptionalValue(const OptionalValue&);
+ //OptionalValue& operator=( const OptionalValue& );
+
+ /** Query whether the value is valid
+
+ @return true, if this object contains a valid value.
+ */
+ bool isValid() const
+ {
+ return mbValid;
+ }
+
+ /** Set a value.
+
+ After this call, the object contains a valid value.
+ */
+ void setValue( const Element& rValue )
+ {
+ maValue = rValue;
+ mbValid = true;
+ }
+
+ /** Get the value.
+
+ The return value of this method is undefined, if the
+ object does not contain a valid value.
+ */
+ Element getValue() const
+ {
+ return maValue;
+ }
+
+ /** Clear the value.
+
+ After this call, the object no longer contains a valid
+ value.
+ */
+ void clearValue()
+ {
+ mbValid = false;
+ }
+
+ // NOTE: The following two methods would optimally have been
+ // implemented as operator>>=/operator<<=
+ // overloads. Unfortunately, there's already a templatized
+ // version for those two methods, namely for UNO interface
+ // types. Adding a second would lead to ambiguities.
+
+ /** Export the value into an Any.
+
+ This method extracts the value into an Any. If the value
+ is invalid, the Any will be cleared.
+
+ @return true, if the value has been successfully
+ transferred to the Any. Clearing the Any from an invalid
+ object is also considered a successful operation.
+ */
+ bool exportValue( ::com::sun::star::uno::Any& o_rAny )
+ {
+ o_rAny.clear();
+
+ if( isValid() )
+ {
+ if( !(o_rAny <<= getValue()) )
+ return false;
+ }
+
+ return true;
+ }
+
+ /** Import the value from an Any.
+
+ This method imports the value from an Any. If the Any
+ is invalid, the object will get an invalid value.
+
+ @return true, if the value has been successfully
+ transferred from the Any. Setting the value to invalid
+ from an empty Any is also considered a successful
+ operation.
+ */
+ bool importValue( const ::com::sun::star::uno::Any& rAny )
+ {
+ clearValue();
+
+ if( rAny.hasValue() )
+ {
+ Element tmp;
+
+ if( !(rAny >>= tmp) )
+ return false;
+
+ setValue( tmp );
+ }
+
+ return true;
+ }
+
+ private:
+ Element maValue;
+ bool mbValid;
+ };
+
+}
+
+#endif /* _COMPHELPER_OPTIONALVALUE_HXX */