/* -*- 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 __FRAMEWORK_CLASSES_CHECKEDITERATOR_HXX_ #define __FRAMEWORK_CLASSES_CHECKEDITERATOR_HXX_ #include #include #include //_________________________________________________________________________________________________________________ // namespace //_________________________________________________________________________________________________________________ namespace framework{ //_________________________________________________________________________________________________________________ // exported const //_________________________________________________________________________________________________________________ //_________________________________________________________________________________________________________________ // exported definitions //_________________________________________________________________________________________________________________ /*-************************************************************************************************************//** @short implement a iterator which support 2 end states! @descr For our search methods we need a "walking" iterator object with special functionality! We must check for 3 different states of an iterator - normal position, exact end, after end. It's neccessary to detect if we have not found a entry and must return our default or default already returned and we must break loop! see using in class FilterCache too for further informations! @Attention If your wish to debug this inline code ... under windows and msdev you can use "set ENVCFLAGS=/Ob0" to do that! @implements - @base - @devstatus ready to use @threadsafe no *//*-*************************************************************************************************************/ template< class TContainer > class CheckedIterator { //------------------------------------------------------------------------------------------------------------- // public methods //------------------------------------------------------------------------------------------------------------- public: //--------------------------------------------------------------------------------------------------------- // constructor / destructor //--------------------------------------------------------------------------------------------------------- /*-****************************************************************************************************//** @short standard constructor @descr Set default values on members. We set it internal to E_UNKNOWN to detect uninitialized instances of this class. If we found one - we know: "We must call initialize first!" @seealso - @param - @return - @onerror - *//*-*****************************************************************************************************/ inline CheckedIterator() : m_eEndState ( E_UNKNOWN ) , m_pContainer( NULL ) { } //--------------------------------------------------------------------------------------------------------- // interface methods //--------------------------------------------------------------------------------------------------------- /*-****************************************************************************************************//** @short initialize instance with valid container @descr Set new container at an instance of this class. The other member will set automaticly! m_pPosition = first element in container m_eEndState = BEFOREEND @seealso - @param "rContainer", must be a valid reference to an existing container. @return - @onerror An assertion is thrown. *//*-*****************************************************************************************************/ inline void initialize( const TContainer& rContainer ) { // Check incoming parameter. We don't accept all! LOG_ASSERT2( &rContainer==NULL , "CheckedIterator::initialize()", "Invalid parameter detected!" ) LOG_ASSERT2( m_eEndState!=E_UNKNOWN , "CheckedIterator::initialize()", "Instance already initialized! Don't do it again." ) if( m_eEndState == E_UNKNOWN ) { // Set new container and update other member. m_pContainer = &rContainer ; m_eEndState = E_BEFOREEND ; m_pPosition = m_pContainer->begin(); } } /*-****************************************************************************************************//** @short set internal states to E_END @descr Sometimes we need a "walking" check-iterator which is initialized with the END-state! We need it to return one default value if no other ones exist ... @seealso using in class FilterCache! @param - @return - @onerror - *//*-*****************************************************************************************************/ inline void setEnd() { m_pContainer = NULL ; m_eEndState = E_END ; } /*-****************************************************************************************************//** @short set internal states to E_AFTEREND @descr Sometimes we need a "walking" check-iterator which is initialized with AFTEREND-state! We need it if we don't have a container but must prevent us against further searching! @seealso using in class FilterCache! @param - @return - @onerror - *//*-*****************************************************************************************************/ inline void setAfterEnd() { m_pContainer = NULL ; m_eEndState = E_AFTEREND ; } /*-****************************************************************************************************//** @short reset this iterator @descr It must be called on an already initialized iterator. Means the member m_pContainer must be valid. Otherwhise the reaction isn't defined. @param - @return - @onerror - *//*-*****************************************************************************************************/ inline void reset() { m_eEndState = E_UNKNOWN; m_pContainer = NULL; } /*-****************************************************************************************************//** @short step to next element in container. @descr If end of container is reached we change our internal "m_eEndState". If end reached for first time; we set it to E_END; If you step to next element again; we set it to E_AFTEREND. So you have a chance to differ between "exact end" and "after end"! @seealso method isEnd() @seealso method isAfterEnd() @param - @return A reference to our changed object himself. @onerror - *//*-*****************************************************************************************************/ inline CheckedIterator& operator++() { // Warn programmer if he forget to initailize object! LOG_ASSERT2( m_pContainer==NULL, "CheckedIterator::operator++()", "Object not initialized!" ) // Step to next element if any exist or set our end states. switch( m_eEndState ) { case E_BEFOREEND: { ++m_pPosition; // If iterator reaching end ... set right state! if( m_pPosition == m_pContainer->end() ) { m_eEndState = E_END; } } break; case E_END : { // Set state only ... iterator already points to end of container! m_eEndState = E_AFTEREND; } break; } return *this; } /*-****************************************************************************************************//** @short return true if internal iterator was not initialized before @descr These will be true, if use start a new search by using these iterator mechanism! @seealso class FilterCache @param - @return True if internalk state E_UNKNOWN - false otherwise. @onerror - *//*-*****************************************************************************************************/ inline sal_Bool isUninitialized() { return( m_eEndState == E_UNKNOWN ); } /*-****************************************************************************************************//** @short return true if internal iterator reached end of container @descr These will be true if you step to the end of internal container. @seealso method isAfterEnd() @param - @return True if end reached; false otherwise. @onerror - *//*-*****************************************************************************************************/ inline sal_Bool isEnd() { // Is true if one end state is set! return ( ( m_eEndState == E_END ) || ( m_eEndState == E_AFTEREND ) ); } /*-****************************************************************************************************//** @short return true if you call operator++ again and end already reached @descr These indicate, that end already reached but you call operator++ again and again! @seealso method isEnd() @param - @return True if end multiple reached; false otherwise. @onerror - *//*-*****************************************************************************************************/ inline sal_Bool isAfterEnd() { // Is true only, if special end state is set! return( m_eEndState == E_AFTEREND ); } /*-****************************************************************************************************//** @short support readonly access to container entry @descr Use it to get the value of current container item. @seealso - @param - @return A reference to value of container entry. @onerror - *//*-*****************************************************************************************************/ inline typename TContainer::const_iterator getEntry() { // Warn programmer if he forget to initialize these object ... LOG_ASSERT2( m_pContainer==NULL, "CheckedIterator::getEntry()", "Object not initialized!" ) // or try to read a non existing element! LOG_ASSERT2( m_eEndState!=E_BEFOREEND, "CheckedIterator::getEntry()", "Wrong using of class detected!" ) return m_pPosition; } //------------------------------------------------------------------------------------------------------------- // private member //------------------------------------------------------------------------------------------------------------- private: // These enum defines our four states for an iterator position in curent container. enum EEndState { E_UNKNOWN , E_BEFOREEND , E_END , E_AFTEREND }; const TContainer* m_pContainer ; // pointer to current container EEndState m_eEndState ; // "position state" of iterator! typename TContainer::const_iterator m_pPosition ; // point to actual element in container }; } // namespace framework #endif // #ifndef __FRAMEWORK_CLASSES_CHECKEDITERATOR_HXX_ /* vim:set shiftwidth=4 softtabstop=4 expandtab: */