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108 lines
2.3 KiB
C++
108 lines
2.3 KiB
C++
/* This file is (c) 2008-2010 Konstantin Isakov <ikm@users.berlios.de>
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* Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */
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#include "history.hh"
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#include "config.hh"
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#include "atomic_rename.hh"
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#include <QFile>
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History::History( unsigned size ): maxSize( size )
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{
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}
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History::History( Load, unsigned size ): maxSize( size )
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{
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QFile file( Config::getHistoryFileName() );
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if ( !file.open( QFile::ReadOnly | QIODevice::Text ) )
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return; // No file -- no history
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for( unsigned count = 0 ; count < maxSize; ++count )
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{
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QByteArray lineUtf8 = file.readLine( 4096 );
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if ( lineUtf8.isEmpty() )
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break;
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if ( lineUtf8.endsWith( '\n' ) )
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lineUtf8.chop( 1 );
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QString line = QString::fromUtf8( lineUtf8 );
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int firstSpace = line.indexOf( ' ' );
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if ( firstSpace < 0 )
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// No spaces? Bad line. End this.
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break;
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bool isNumber;
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unsigned groupId = line.left( firstSpace ).toUInt( &isNumber, 10 );
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if ( !isNumber )
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break; // That's not right
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items.push_back( Item( groupId, line.right( line.size() - firstSpace - 1 ) ) );
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}
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}
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void History::addItem( Item const & item )
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{
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if ( item.word.size() > 60 )
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{
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// The search looks bogus. Don't save it.
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return;
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}
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if ( items.contains( item ) )
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items.removeAll( item );
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// Special case: if this items differs from the previous one only by group,
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// remove it too.
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if ( items.size() && items.first().word == item.word )
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items.pop_front();
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items.push_front( item );
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while( items.size() > (int)maxSize )
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items.pop_back();
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emit itemsChanged();
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}
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bool History::save() const
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{
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QFile file( Config::getHistoryFileName() + ".tmp" );
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if ( !file.open( QFile::WriteOnly | QIODevice::Text ) )
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return false;
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for( QList< Item >::const_iterator i = items.constBegin();
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i != items.constEnd(); ++i )
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{
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QByteArray line = i->word.toUtf8();
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// Those could ruin our format, so we replace them by spaces. They shouldn't
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// be there anyway.
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line.replace( '\n', ' ' );
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line.replace( '\r', ' ' );
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line = QByteArray::number( i->groupId ) + " " + line + "\n";
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if ( file.write( line ) != line.size() )
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return false;
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}
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file.close();
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return renameAtomically( file.fileName(), Config::getHistoryFileName() );
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}
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void History::clear()
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{
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items.clear();
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emit itemsChanged();
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}
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