/* This file is (c) 2008-2012 Konstantin Isakov * Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */ #include "history.hh" #include "config.hh" #include "atomic_rename.hh" #include #include History::History( unsigned size, unsigned maxItemLength_ ): maxSize( size ), maxItemLength( maxItemLength_ ), addingEnabled( true ) { } History::History( Load, unsigned size, unsigned maxItemLength_ ): maxSize( size ), maxItemLength( maxItemLength_ ), addingEnabled( true ) , dirty( false ) , timerId ( 0 ) { QFile file( Config::getHistoryFileName() ); if ( !file.open( QFile::ReadOnly | QIODevice::Text ) ) return; // No file -- no history for( unsigned count = 0 ; count < maxSize; ++count ) { QByteArray lineUtf8 = file.readLine( 4096 ); if ( lineUtf8.endsWith( '\n' ) ) lineUtf8.chop( 1 ); if ( lineUtf8.isEmpty() ) break; QString line = QString::fromUtf8( lineUtf8 ); int firstSpace = line.indexOf( ' ' ); if ( firstSpace < 0 || firstSpace + 1 == line.size() ) // No spaces or value? Bad line. End this. break; bool isNumber; unsigned groupId = line.left( firstSpace ).toUInt( &isNumber, 10 ); if ( !isNumber ) break; // That's not right items.push_back( Item( groupId, line.right( line.size() - firstSpace - 1 ) ) ); } } History::Item History::getItem( int index ) { if ( index < 0 || index >= items.size() ) { return Item(); } return items.at( index ); } void History::addItem( Item const & item ) { // qDebug() << "adding item " << item.word << ", enabled=" << enabled(); if( !enabled() ) return; if ( (unsigned)item.word.size() > getMaxItemLength() || item.word.isEmpty() ) { // The search looks bogus. Don't save it. return; } if ( items.contains( item ) ) items.removeAll( item ); // Special case: if this items differs from the previous one only by group, // remove it too. if ( items.size() && items.first().word == item.word ) items.pop_front(); items.push_front( item ); ensureSizeConstraints(); dirty = true; emit itemsChanged(); } bool History::ensureSizeConstraints() { bool changed = false; while( items.size() > (int)maxSize ) { items.pop_back(); changed = true; dirty = true; } return changed; } void History::setMaxSize( unsigned maxSize_ ) { maxSize = maxSize_; if ( ensureSizeConstraints() ) { emit itemsChanged(); } } int History::size() const { return items.size(); } bool History::save() { if( !dirty ) return true; QFile file( Config::getHistoryFileName() + ".tmp" ); if ( !file.open( QFile::WriteOnly | QIODevice::Text ) ) return false; for( QList< Item >::const_iterator i = items.constBegin(); i != items.constEnd(); ++i ) { QByteArray line = i->word.toUtf8(); // Those could ruin our format, so we replace them by spaces. They shouldn't // be there anyway. line.replace( '\n', ' ' ); line.replace( '\r', ' ' ); line = QByteArray::number( i->groupId ) + " " + line + "\n"; if ( file.write( line ) != line.size() ) return false; } file.close(); dirty = false; return renameAtomically( file.fileName(), Config::getHistoryFileName() ); } void History::clear() { items.clear(); emit itemsChanged(); } void History::setSaveInterval( unsigned interval ) { if( timerId ) { killTimer( timerId ); timerId = 0; } if( interval ) { if( dirty ) save(); timerId = startTimer( interval * 60000 ); } } void History::timerEvent( QTimerEvent * ev ) { Q_UNUSED( ev ); save(); }