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+/****************************************************************************
+**
+** Implementation of QGCache and QGCacheIterator classes
+**
+** Created : 950208
+**
+** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
+**
+** This file is part of the tools module of the Qt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free Qt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing requirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at [email protected].
+**
+** This file may be used under the terms of the Q Public License as
+** defined by Trolltech ASA and appearing in the file LICENSE.QPL
+** included in the packaging of this file. Licensees holding valid Qt
+** Commercial licenses may use this file in accordance with the Qt
+** Commercial License Agreement provided with the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+#include "qgcache.h"
+#include "qptrlist.h"
+#include "qdict.h"
+#include "qstring.h"
+
+/*!
+ \class QGCache qgcache.h
+ \reentrant
+ \ingroup shared
+ \ingroup collection
+ \brief The QGCache class is an internal class for implementing QCache
+ template classes.
+
+ \internal
+
+ QGCache is a strictly internal class that acts as a base class for the
+ \link collection.html collection classes\endlink QCache and QIntCache.
+*/
+
+
+/*****************************************************************************
+ QGCacheItem class (internal cache item)
+ *****************************************************************************/
+
+struct QCacheItem
+{
+ QCacheItem( void *k, QPtrCollection::Item d, int c, short p )
+ : priority(p), skipPriority(p), cost(c), key(k), data(d), node(0) {}
+ short priority;
+ short skipPriority;
+ int cost;
+ void *key;
+ QPtrCollection::Item data;
+ QLNode *node;
+};
+
+
+/*****************************************************************************
+ QCList class (internal list of cache items)
+ *****************************************************************************/
+
+class QCList : private QPtrList<QCacheItem>
+{
+friend class QGCacheIterator;
+friend class QCListIt;
+public:
+ QCList() {}
+ ~QCList();
+
+ void insert( QCacheItem * ); // insert according to priority
+ void insert( int, QCacheItem * );
+ void take( QCacheItem * );
+ void reference( QCacheItem * );
+
+ void setAutoDelete( bool del ) { QPtrCollection::setAutoDelete(del); }
+
+ bool removeFirst() { return QPtrList<QCacheItem>::removeFirst(); }
+ bool removeLast() { return QPtrList<QCacheItem>::removeLast(); }
+
+ QCacheItem *first() { return QPtrList<QCacheItem>::first(); }
+ QCacheItem *last() { return QPtrList<QCacheItem>::last(); }
+ QCacheItem *prev() { return QPtrList<QCacheItem>::prev(); }
+ QCacheItem *next() { return QPtrList<QCacheItem>::next(); }
+
+#if defined(QT_DEBUG)
+ int inserts; // variables for statistics
+ int insertCosts;
+ int insertMisses;
+ int finds;
+ int hits;
+ int hitCosts;
+ int dumps;
+ int dumpCosts;
+#endif
+};
+
+
+QCList::~QCList()
+{
+#if defined(QT_DEBUG)
+ Q_ASSERT( count() == 0 );
+#endif
+}
+
+
+void QCList::insert( QCacheItem *ci )
+{
+ QCacheItem *item = first();
+ while( item && item->skipPriority > ci->priority ) {
+ item->skipPriority--;
+ item = next();
+ }
+ if ( item )
+ QPtrList<QCacheItem>::insert( at(), ci );
+ else
+ append( ci );
+#if defined(QT_DEBUG)
+ Q_ASSERT( ci->node == 0 );
+#endif
+ ci->node = currentNode();
+}
+
+inline void QCList::insert( int i, QCacheItem *ci )
+{
+ QPtrList<QCacheItem>::insert( i, ci );
+#if defined(QT_DEBUG)
+ Q_ASSERT( ci->node == 0 );
+#endif
+ ci->node = currentNode();
+}
+
+
+void QCList::take( QCacheItem *ci )
+{
+ if ( ci ) {
+#if defined(QT_DEBUG)
+ Q_ASSERT( ci->node != 0 );
+#endif
+ takeNode( ci->node );
+ ci->node = 0;
+ }
+}
+
+
+inline void QCList::reference( QCacheItem *ci )
+{
+#if defined(QT_DEBUG)
+ Q_ASSERT( ci != 0 && ci->node != 0 );
+#endif
+ ci->skipPriority = ci->priority;
+ relinkNode( ci->node ); // relink as first item
+}
+
+
+class QCListIt: public QPtrListIterator<QCacheItem>
+{
+public:
+ QCListIt( const QCList *p ): QPtrListIterator<QCacheItem>( *p ) {}
+ QCListIt( const QCListIt *p ): QPtrListIterator<QCacheItem>( *p ) {}
+};
+
+
+/*****************************************************************************
+ QCDict class (internal dictionary of cache items)
+ *****************************************************************************/
+
+//
+// Since we need to decide if the dictionary should use an int or const
+// char * key (the "bool trivial" argument in the constructor below)
+// we cannot use the macro/template dict, but inherit directly from QGDict.
+//
+
+class QCDict : public QGDict
+{
+public:
+ QCDict( uint size, uint kt, bool caseSensitive, bool copyKeys )
+ : QGDict( size, (KeyType)kt, caseSensitive, copyKeys ) {}
+ ~QCDict();
+
+ void clear() { QGDict::clear(); }
+
+ QCacheItem *find_string(const QString &key) const
+ { return (QCacheItem*)((QCDict*)this)->look_string(key, 0, 0); }
+ QCacheItem *find_ascii(const char *key) const
+ { return (QCacheItem*)((QCDict*)this)->look_ascii(key, 0, 0); }
+ QCacheItem *find_int(long key) const
+ { return (QCacheItem*)((QCDict*)this)->look_int(key, 0, 0); }
+
+ QCacheItem *take_string(const QString &key)
+ { return (QCacheItem*)QGDict::take_string(key); }
+ QCacheItem *take_ascii(const char *key)
+ { return (QCacheItem*)QGDict::take_ascii(key); }
+ QCacheItem *take_int(long key)
+ { return (QCacheItem*)QGDict::take_int(key); }
+
+ bool insert_string( const QString &key, const QCacheItem *ci )
+ { return QGDict::look_string(key,(Item)ci,1)!=0;}
+ bool insert_ascii( const char *key, const QCacheItem *ci )
+ { return QGDict::look_ascii(key,(Item)ci,1)!=0;}
+ bool insert_int( long key, const QCacheItem *ci )
+ { return QGDict::look_int(key,(Item)ci,1)!=0;}
+
+ bool remove_string( QCacheItem *item )
+ { return QGDict::remove_string(*((QString*)(item->key)),item); }
+ bool remove_ascii( QCacheItem *item )
+ { return QGDict::remove_ascii((const char *)item->key,item); }
+ bool remove_int( QCacheItem *item )
+ { return QGDict::remove_int((long)item->key,item);}
+
+ void statistics() { QGDict::statistics(); }
+
+private:
+ void deleteItem( void *item )
+ { if ( del_item ) { QCacheItem *d = (QCacheItem*)item; delete d; } }
+};
+
+inline QCDict::~QCDict()
+{
+ clear();
+}
+
+/*****************************************************************************
+ QGDict member functions
+ *****************************************************************************/
+
+/*!
+ Constructs a cache.
+ The maximum cost of the cache is given by \a maxCost and the size by \a
+ size. The key type is \a kt which may be \c StringKey, \c AsciiKey,
+ \c IntKey or \c PtrKey. The case-sensitivity of lookups is set with
+ \a caseSensitive. Keys are copied if \a copyKeys is TRUE.
+*/
+
+QGCache::QGCache( int maxCost, uint size, KeyType kt, bool caseSensitive,
+ bool copyKeys )
+{
+ keytype = kt;
+ lruList = new QCList;
+ Q_CHECK_PTR( lruList );
+ lruList->setAutoDelete( TRUE );
+ copyk = ((keytype == AsciiKey) && copyKeys);
+ dict = new QCDict( size, kt, caseSensitive, FALSE );
+ Q_CHECK_PTR( dict );
+ mCost = maxCost;
+ tCost = 0;
+#if defined(QT_DEBUG)
+ lruList->inserts = 0;
+ lruList->insertCosts = 0;
+ lruList->insertMisses = 0;
+ lruList->finds = 0;
+ lruList->hits = 0;
+ lruList->hitCosts = 0;
+ lruList->dumps = 0;
+ lruList->dumpCosts = 0;
+#endif
+}
+
+/*!
+ Cannot copy a cache.
+*/
+
+QGCache::QGCache( const QGCache & )
+ : QPtrCollection()
+{
+#if defined(QT_CHECK_NULL)
+ qFatal( "QGCache::QGCache(QGCache &): Cannot copy a cache" );
+#endif
+}
+
+/*!
+ Removes all items from the cache and destroys it.
+*/
+
+QGCache::~QGCache()
+{
+ clear();
+ delete dict;
+ delete lruList;
+}
+
+/*!
+ Cannot assign a cache.
+*/
+
+QGCache &QGCache::operator=( const QGCache & )
+{
+#if defined(QT_CHECK_NULL)
+ qFatal( "QGCache::operator=: Cannot copy a cache" );
+#endif
+ return *this;
+}
+
+
+/*!
+ Returns the number of items in the cache.
+*/
+
+uint QGCache::count() const
+{
+ return dict->count();
+}
+
+/*!
+ Returns the size of the hash array.
+*/
+
+uint QGCache::size() const
+{
+ return dict->size();
+}
+
+/*!
+ \fn int QGCache::maxCost() const
+
+ Returns the maximum cache cost.
+*/
+
+/*!
+ \fn int QGCache::totalCost() const
+
+ Returns the total cache cost.
+*/
+
+/*!
+ Sets the maximum cache cost to \a maxCost.
+*/
+
+void QGCache::setMaxCost( int maxCost )
+{
+ if ( maxCost < tCost ) {
+ if ( !makeRoomFor(tCost - maxCost) ) // remove excess cost
+ return;
+ }
+ mCost = maxCost;
+}
+
+
+/*!
+ Inserts an item with data \a data into the cache using key \a key.
+ The item has cost \a cost and priority \a priority.
+
+ \warning If this function returns FALSE, you must delete \a data
+ yourself. Additionally, be very careful about using \a data after
+ calling this function, as any other insertions into the cache, from
+ anywhere in the application, or within Qt itself, could cause the
+ data to be discarded from the cache, and the pointer to become
+ invalid.
+*/
+
+bool QGCache::insert_string( const QString &key, QPtrCollection::Item data,
+ int cost, int priority)
+{
+ if ( tCost + cost > mCost ) {
+ if ( !makeRoomFor(tCost + cost - mCost, priority) ) {
+#if defined(QT_DEBUG)
+ lruList->insertMisses++;
+#endif
+ return FALSE;
+ }
+ }
+#if defined(QT_DEBUG)
+ Q_ASSERT( keytype == StringKey );
+ lruList->inserts++;
+ lruList->insertCosts += cost;
+#endif
+ if ( priority < -32768 )
+ priority = -32768;
+ else if ( priority > 32767 )
+ priority = 32677;
+ QCacheItem *ci = new QCacheItem( new QString(key), newItem(data),
+ cost, (short)priority );
+ Q_CHECK_PTR( ci );
+ lruList->insert( 0, ci );
+ dict->insert_string( key, ci );
+ tCost += cost;
+ return TRUE;
+}
+
+bool QGCache::insert_other( const char *key, QPtrCollection::Item data,
+ int cost, int priority)
+{
+ if ( tCost + cost > mCost ) {
+ if ( !makeRoomFor(tCost + cost - mCost, priority) ) {
+#if defined(QT_DEBUG)
+ lruList->insertMisses++;
+#endif
+ return FALSE;
+ }
+ }
+#if defined(QT_DEBUG)
+ Q_ASSERT( keytype != StringKey );
+ lruList->inserts++;
+ lruList->insertCosts += cost;
+#endif
+ if ( keytype == AsciiKey && copyk )
+ key = qstrdup( key );
+ if ( priority < -32768 )
+ priority = -32768;
+ else if ( priority > 32767 )
+ priority = 32677;
+ QCacheItem *ci = new QCacheItem( (void*)key, newItem(data), cost,
+ (short)priority );
+ Q_CHECK_PTR( ci );
+ lruList->insert( 0, ci );
+ if ( keytype == AsciiKey )
+ dict->insert_ascii( key, ci );
+ else
+ dict->insert_int( (long)key, ci );
+ tCost += cost;
+ return TRUE;
+}
+
+
+/*!
+ Removes the item with key \a key from the cache. Returns TRUE if the
+ item was removed; otherwise returns FALSE.
+*/
+
+bool QGCache::remove_string( const QString &key )
+{
+ Item d = take_string( key );
+ if ( d )
+ deleteItem( d );
+ return d != 0;
+}
+
+bool QGCache::remove_other( const char *key )
+{
+ Item d = take_other( key );
+ if ( d )
+ deleteItem( d );
+ return d != 0;
+}
+
+
+/*!
+ Takes the item with key \a key out of the cache. The item is not
+ deleted. If no item has this \a key 0 is returned.
+*/
+
+QPtrCollection::Item QGCache::take_string( const QString &key )
+{
+ QCacheItem *ci = dict->take_string( key ); // take from dict
+ Item d;
+ if ( ci ) {
+ d = ci->data;
+ tCost -= ci->cost;
+ lruList->take( ci ); // take from list
+ delete (QString*)ci->key;
+ delete ci;
+ } else {
+ d = 0;
+ }
+ return d;
+}
+
+/*!
+ Takes the item with key \a key out of the cache. The item is not
+ deleted. If no item has this \a key 0 is returned.
+*/
+
+QPtrCollection::Item QGCache::take_other( const char *key )
+{
+ QCacheItem *ci;
+ if ( keytype == AsciiKey )
+ ci = dict->take_ascii( key );
+ else
+ ci = dict->take_int( (long)key );
+ Item d;
+ if ( ci ) {
+ d = ci->data;
+ tCost -= ci->cost;
+ lruList->take( ci ); // take from list
+ if ( copyk )
+ delete [] (char *)ci->key;
+ delete ci;
+ } else {
+ d = 0;
+ }
+ return d;
+}
+
+
+/*!
+ Clears the cache.
+*/
+
+void QGCache::clear()
+{
+ QCacheItem *ci;
+ while ( (ci = lruList->first()) ) {
+ switch ( keytype ) {
+ case StringKey:
+ dict->remove_string( ci );
+ delete (QString*)ci->key;
+ break;
+ case AsciiKey:
+ dict->remove_ascii( ci );
+ if ( copyk )
+ delete [] (char*)ci->key;
+ break;
+ case IntKey:
+ dict->remove_int( ci );
+ break;
+ case PtrKey: // unused
+ break;
+ }
+ deleteItem( ci->data ); // delete data
+ lruList->removeFirst(); // remove from list
+ }
+ tCost = 0;
+}
+
+
+/*!
+ Finds an item for \a key in the cache and adds a reference if \a ref is TRUE.
+*/
+
+QPtrCollection::Item QGCache::find_string( const QString &key, bool ref ) const
+{
+ QCacheItem *ci = dict->find_string( key );
+#if defined(QT_DEBUG)
+ lruList->finds++;
+#endif
+ if ( ci ) {
+#if defined(QT_DEBUG)
+ lruList->hits++;
+ lruList->hitCosts += ci->cost;
+#endif
+ if ( ref )
+ lruList->reference( ci );
+ return ci->data;
+ }
+ return 0;
+}
+
+
+/*!
+ Finds an item for \a key in the cache and adds a reference if \a ref is TRUE.
+*/
+
+QPtrCollection::Item QGCache::find_other( const char *key, bool ref ) const
+{
+ QCacheItem *ci = keytype == AsciiKey ? dict->find_ascii(key)
+ : dict->find_int((long)key);
+#if defined(QT_DEBUG)
+ lruList->finds++;
+#endif
+ if ( ci ) {
+#if defined(QT_DEBUG)
+ lruList->hits++;
+ lruList->hitCosts += ci->cost;
+#endif
+ if ( ref )
+ lruList->reference( ci );
+ return ci->data;
+ }
+ return 0;
+}
+
+
+/*!
+ Allocates cache space for one or more items.
+*/
+
+bool QGCache::makeRoomFor( int cost, int priority )
+{
+ if ( cost > mCost ) // cannot make room for more
+ return FALSE; // than maximum cost
+ if ( priority == -1 )
+ priority = 32767;
+ register QCacheItem *ci = lruList->last();
+ int cntCost = 0;
+ int dumps = 0; // number of items to dump
+ while ( cntCost < cost && ci && ci->skipPriority <= priority ) {
+ cntCost += ci->cost;
+ ci = lruList->prev();
+ dumps++;
+ }
+ if ( cntCost < cost ) // can enough cost be dumped?
+ return FALSE; // no
+#if defined(QT_DEBUG)
+ Q_ASSERT( dumps > 0 );
+#endif
+ while ( dumps-- ) {
+ ci = lruList->last();
+#if defined(QT_DEBUG)
+ lruList->dumps++;
+ lruList->dumpCosts += ci->cost;
+#endif
+ switch ( keytype ) {
+ case StringKey:
+ dict->remove_string( ci );
+ delete (QString*)ci->key;
+ break;
+ case AsciiKey:
+ dict->remove_ascii( ci );
+ if ( copyk )
+ delete [] (char *)ci->key;
+ break;
+ case IntKey:
+ dict->remove_int( ci );
+ break;
+ case PtrKey: // unused
+ break;
+ }
+ deleteItem( ci->data ); // delete data
+ lruList->removeLast(); // remove from list
+ }
+ tCost -= cntCost;
+ return TRUE;
+}
+
+
+/*!
+ Outputs debug statistics.
+*/
+
+void QGCache::statistics() const
+{
+#if defined(QT_DEBUG)
+ QString line;
+ line.fill( '*', 80 );
+ qDebug( line.ascii() );
+ qDebug( "CACHE STATISTICS:" );
+ qDebug( "cache contains %d item%s, with a total cost of %d",
+ count(), count() != 1 ? "s" : "", tCost );
+ qDebug( "maximum cost is %d, cache is %d%% full.",
+ mCost, (200*tCost + mCost) / (mCost*2) );
+ qDebug( "find() has been called %d time%s",
+ lruList->finds, lruList->finds != 1 ? "s" : "" );
+ qDebug( "%d of these were hits, items found had a total cost of %d.",
+ lruList->hits,lruList->hitCosts );
+ qDebug( "%d item%s %s been inserted with a total cost of %d.",
+ lruList->inserts,lruList->inserts != 1 ? "s" : "",
+ lruList->inserts != 1 ? "have" : "has", lruList->insertCosts );
+ qDebug( "%d item%s %s too large or had too low priority to be inserted.",
+ lruList->insertMisses, lruList->insertMisses != 1 ? "s" : "",
+ lruList->insertMisses != 1 ? "were" : "was" );
+ qDebug( "%d item%s %s been thrown away with a total cost of %d.",
+ lruList->dumps, lruList->dumps != 1 ? "s" : "",
+ lruList->dumps != 1 ? "have" : "has", lruList->dumpCosts );
+ qDebug( "Statistics from internal dictionary class:" );
+ dict->statistics();
+ qDebug( line.ascii() );
+#endif
+}
+
+
+/*****************************************************************************
+ QGCacheIterator member functions
+ *****************************************************************************/
+
+/*!
+ \class QGCacheIterator qgcache.h
+ \reentrant
+ \ingroup shared
+ \ingroup collection
+ \brief The QGCacheIterator class is an internal class for implementing QCacheIterator and
+ QIntCacheIterator.
+
+ \internal
+
+ QGCacheIterator is a strictly internal class that does the heavy work for
+ QCacheIterator and QIntCacheIterator.
+*/
+
+/*!
+ Constructs an iterator that operates on the cache \a c.
+*/
+
+QGCacheIterator::QGCacheIterator( const QGCache &c )
+{
+ it = new QCListIt( c.lruList );
+#if defined(QT_DEBUG)
+ Q_ASSERT( it != 0 );
+#endif
+}
+
+/*!
+ Constructs an iterator that operates on the same cache as \a ci.
+*/
+
+QGCacheIterator::QGCacheIterator( const QGCacheIterator &ci )
+{
+ it = new QCListIt( ci.it );
+#if defined(QT_DEBUG)
+ Q_ASSERT( it != 0 );
+#endif
+}
+
+/*!
+ Destroys the iterator.
+*/
+
+QGCacheIterator::~QGCacheIterator()
+{
+ delete it;
+}
+
+/*!
+ Assigns the iterator \a ci to this cache iterator.
+*/
+
+QGCacheIterator &QGCacheIterator::operator=( const QGCacheIterator &ci )
+{
+ *it = *ci.it;
+ return *this;
+}
+
+/*!
+ Returns the number of items in the cache.
+*/
+
+uint QGCacheIterator::count() const
+{
+ return it->count();
+}
+
+/*!
+ Returns TRUE if the iterator points to the first item.
+*/
+
+bool QGCacheIterator::atFirst() const
+{
+ return it->atFirst();
+}
+
+/*!
+ Returns TRUE if the iterator points to the last item.
+*/
+
+bool QGCacheIterator::atLast() const
+{
+ return it->atLast();
+}
+
+/*!
+ Sets the list iterator to point to the first item in the cache.
+*/
+
+QPtrCollection::Item QGCacheIterator::toFirst()
+{
+ QCacheItem *item = it->toFirst();
+ return item ? item->data : 0;
+}
+
+/*!
+ Sets the list iterator to point to the last item in the cache.
+*/
+
+QPtrCollection::Item QGCacheIterator::toLast()
+{
+ QCacheItem *item = it->toLast();
+ return item ? item->data : 0;
+}
+
+/*!
+ Returns the current item.
+*/
+
+QPtrCollection::Item QGCacheIterator::get() const
+{
+ QCacheItem *item = it->current();
+ return item ? item->data : 0;
+}
+
+/*!
+ Returns the key of the current item.
+*/
+
+QString QGCacheIterator::getKeyString() const
+{
+ QCacheItem *item = it->current();
+ return item ? *((QString*)item->key) : QString::null;
+}
+
+/*!
+ Returns the key of the current item, as a \0-terminated C string.
+*/
+
+const char *QGCacheIterator::getKeyAscii() const
+{
+ QCacheItem *item = it->current();
+ return item ? (const char *)item->key : 0;
+}
+
+/*!
+ Returns the key of the current item, as a long.
+*/
+
+long QGCacheIterator::getKeyInt() const
+{
+ QCacheItem *item = it->current();
+ return item ? (long)item->key : 0;
+}
+
+/*!
+ Moves to the next item (postfix).
+*/
+
+QPtrCollection::Item QGCacheIterator::operator()()
+{
+ QCacheItem *item = it->operator()();
+ return item ? item->data : 0;
+}
+
+/*!
+ Moves to the next item (prefix).
+*/
+
+QPtrCollection::Item QGCacheIterator::operator++()
+{
+ QCacheItem *item = it->operator++();
+ return item ? item->data : 0;
+}
+
+/*!
+ Moves \a jump positions forward.
+*/
+
+QPtrCollection::Item QGCacheIterator::operator+=( uint jump )
+{
+ QCacheItem *item = it->operator+=(jump);
+ return item ? item->data : 0;
+}
+
+/*!
+ Moves to the previous item (prefix).
+*/
+
+QPtrCollection::Item QGCacheIterator::operator--()
+{
+ QCacheItem *item = it->operator--();
+ return item ? item->data : 0;
+}
+
+/*!
+ Moves \a jump positions backward.
+*/
+
+QPtrCollection::Item QGCacheIterator::operator-=( uint jump )
+{
+ QCacheItem *item = it->operator-=(jump);
+ return item ? item->data : 0;
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-16 09:29:10 +0000