diff -r 2bb96f4ecad8 -r 8e7494275d3a omads/omadsextensions/adapters/mediads/src/changefinder.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/omads/omadsextensions/adapters/mediads/src/changefinder.cpp Tue Aug 31 15:05:37 2010 +0300 @@ -0,0 +1,537 @@ +/* +* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). +* All rights reserved. +* This component and the accompanying materials are made available +* under the terms of "Eclipse Public License v1.0" +* which accompanies this distribution, and is available +* at the URL "http://www.eclipse.org/legal/epl-v10.html". +* +* Initial Contributors: +* Nokia Corporation - initial contribution. +* +* Contributors: +* +* Description: Part of SyncML Data Synchronization Plug In Adapter +* +*/ + + +#include "changefinder.h" +#include "logger.h" + +const TUint KSnapshotFormatVersion ( 0xf0000001 ); // format version + +// ----------------------------------------------------------------------------- +// CChangeFinder::NewL +// Static function to create CChangeFider object(s) +// ----------------------------------------------------------------------------- +CChangeFinder* CChangeFinder::NewL( MSmlSyncRelationship& aSyncRelationship, TKeyArrayFix aKey, + TBool& aHasHistory, TInt aStreamUid ) + { + CChangeFinder* self = new (ELeave) CChangeFinder( aSyncRelationship, aKey, aStreamUid ); + CleanupStack::PushL( self ); + self->ConstructL( aHasHistory ); + CleanupStack::Pop( self ); + return self; + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::CChangeFinder +// Constructor for the class +// ----------------------------------------------------------------------------- +CChangeFinder::CChangeFinder( MSmlSyncRelationship& aSyncRelationship, TKeyArrayFix aKey, TInt aStreamUid ) : +iSyncRelationship( aSyncRelationship ), +iKey(aKey), +iStreamUid( aStreamUid ), +iDataStoreUid( KErrNotFound ) + { + + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::~CChangeFinder +// Destructor for the class, closes the ChangeFinder and writes snapshot to stream +// ----------------------------------------------------------------------------- +CChangeFinder::~CChangeFinder() + { + TRACE_FUNC_ENTRY; + TInt error; + TRAP( error, CloseL() ); + if ( error != KErrNone ) + { + LOGGER_WRITE( "CChangeFinder::~CChangeFinder, CloseL failed." ); + } + + delete iCurrentSnapshot; + iCurrentSnapshot = NULL; + delete iOldSnapshot; + iOldSnapshot = NULL; + + TRACE_FUNC_EXIT; + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::ConstructL +// 2nd phase constructor for the class, reads snapshot from stream +// ----------------------------------------------------------------------------- +void CChangeFinder::ConstructL( TBool& aHasHistory ) + { + TRACE_FUNC_ENTRY; + + TUid streamId; + streamId.iUid = iStreamUid; + + aHasHistory = iSyncRelationship.IsStreamPresentL(streamId); + + if ( aHasHistory ) + { + LOGGER_WRITE("CChangeFinder::ConstructL, history exists."); + RReadStream readStream; + iSyncRelationship.OpenReadStreamLC(readStream, streamId); + + // Read the index, first create snapshot array + iOldSnapshot = new (ELeave) CSnapshotArray( KSnapshotGranularity ); + + // Read used format version + TUint formatVer = readStream.ReadUint32L(); + if ( formatVer != KSnapshotFormatVersion ) + { + // Wrong version, do not try to import data + LOGGER_WRITE("CChangeFinder::ConstructL, Wrong format version -> no history"); + aHasHistory = EFalse; + CleanupStack::PopAndDestroy( &readStream ); + TRACE_FUNC_EXIT; + return; + } + + // Read item count + TInt count = readStream.ReadUint32L(); + // Read items + for ( TInt i=0; iInsertIsqL( item, iKey ); + } + + CleanupStack::PopAndDestroy( &readStream ); + } + else + { + LOGGER_WRITE("CChangeFinder::ConstructL, no sync history."); + } + + TRACE_FUNC_EXIT; + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::CloseL +// Closes ChangeFinder object and writes snapshot to stream +// ----------------------------------------------------------------------------- +void CChangeFinder::CloseL() + { + TRACE_FUNC_ENTRY; + + // Write to stream + RWriteStream writeStream; + + TUid streamId; + streamId.iUid = iStreamUid; + + // Open write stream + iSyncRelationship.OpenWriteStreamLC( writeStream, streamId ); + + // Write used format version + writeStream.WriteUint32L( KSnapshotFormatVersion ); + + // Write item count + TInt count(0); + if ( iOldSnapshot ) + { + count = iOldSnapshot->Count(); + } + writeStream.WriteUint32L(count); + + // Write items + for (TInt i=0; iAt( i ); + item.ExternalizeL( writeStream ); + } + + writeStream.CommitL(); + CleanupStack::PopAndDestroy( &writeStream ); + + TRACE_FUNC_EXIT; + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::ResetL +// Resets synchronization history, all contetn is considered new after this call +// ----------------------------------------------------------------------------- +void CChangeFinder::ResetL() + { + TRACE_FUNC_ENTRY; + + // Delete old change information + if ( iOldSnapshot ) + { + LOGGER_WRITE("iOldSnapshot->Reset()"); + iOldSnapshot->Reset(); + } + + // Write 'null' data to file, + // this removes change history from the file + CloseL(); + + TRACE_FUNC_EXIT; + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::FindChangedItemsL +// Compares snapshots, finds changed items +// ----------------------------------------------------------------------------- +void CChangeFinder::FindChangedItemsL( CNSmlDataItemUidSet& aChangedUids ) + { + TRACE_FUNC_ENTRY; + + if ( !iCurrentSnapshot ) + { + LOGGER_WRITE( "CChangeFinder::FindChangedItemsL leaved, no current snapshot." ); + User::Leave( KErrNotFound ); + } + + if ( !iOldSnapshot ) + { + LOGGER_WRITE( "CChangeFinder::FindChangedItemsL leaved, no old snapshot." ); + User::Leave( KErrNotFound ); + } + + TInt index; + TInt count = iCurrentSnapshot->Count(); + LOGGER_WRITE_1( "CChangeFinder::FindChangedItemsL count: %d", count ); + for ( TInt i=0; i < count; i++ ) + { + const TSnapshotItem& currentItem = iCurrentSnapshot->At( i ); + // Find this entry from the old snapshot + if ( iOldSnapshot->FindIsq( currentItem, iKey, index ) == KErrNone) + { + // This is the old item + TSnapshotItem& oldItem = iOldSnapshot->At( index ); + // Compare hash to see whether this was changed + if ( oldItem.Hash().Compare( currentItem.Hash() ) != 0 + || oldItem.ParentId() != currentItem.ParentId() ) + { + aChangedUids.AddItem( currentItem.ItemId() ); + //LOGGER_WRITE_1( "Item %d was changed.", currentItem.ItemId() ); + } + } + } + + TRACE_FUNC_EXIT; + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::FindDeletedItemsL +// Compares snapshots, finds deleted items +// ----------------------------------------------------------------------------- +void CChangeFinder::FindDeletedItemsL( CNSmlDataItemUidSet& aDeletedUids ) + { + TRACE_FUNC_ENTRY; + + if ( !iOldSnapshot ) + { + LOGGER_WRITE( "CChangeFinder::FindDeletedItemsL leaved, no old snapshot." ); + User::Leave( KErrNotFound ); + } + + TInt index; + TInt count = iOldSnapshot->Count(); + for ( TInt i=0; i < count; i++ ) + { + const TSnapshotItem& currentItem = iOldSnapshot->At( i ); + + // If there's no current snapshot, this definately is deleted item + if ( !iCurrentSnapshot ) + { + aDeletedUids.AddItem( currentItem.ItemId() ); + //LOGGER_WRITE_1( "Item %d was deleted.", currentItem.ItemId() ); + } + // It is also new if it doesn't exist int the current snapshot. + else if ( iCurrentSnapshot->FindIsq( currentItem, iKey, index ) != KErrNone ) + { + aDeletedUids.AddItem( currentItem.ItemId() ); + //LOGGER_WRITE_1( "Item %d was deleted.", currentItem.ItemId() ); + } + } + + TRACE_FUNC_EXIT; + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::FindNewItemsL +// Compares snapshots, finds new items +// ----------------------------------------------------------------------------- +void CChangeFinder::FindNewItemsL( CNSmlDataItemUidSet& aNewUids ) + { + TRACE_FUNC_ENTRY; + + if ( !iCurrentSnapshot ) + { + LOGGER_WRITE( "CChangeFinder::FindNewItemsL leaved, no current snapshot." ); + User::Leave( KErrNotFound ); + } + + TInt index; + TInt count = iCurrentSnapshot->Count(); + for ( TInt i=0; i < count; i++ ) + { + const TSnapshotItem& currentItem = iCurrentSnapshot->At( i ); + + // If there's no old snapshot, all items are new + if ( !iOldSnapshot ) + { + aNewUids.AddItem( currentItem.ItemId() ); + //LOGGER_WRITE_1( "Item %d was new.", currentItem.ItemId() ); + } + // It is also new if it doesn't exist int the old snapshot. + else if ( iOldSnapshot->FindIsq( currentItem, iKey, index ) != KErrNone ) + { + aNewUids.AddItem( currentItem.ItemId() ); + //LOGGER_WRITE_1( "Item %d was new.", currentItem.ItemId() ); + } + } + + TRACE_FUNC_EXIT; + } + + +// ----------------------------------------------------------------------------- +// CChangeFinder::ItemAddedL +// Adds item to snapshot, this item is no longer considered new +// ----------------------------------------------------------------------------- +void CChangeFinder::ItemAddedL( const TSnapshotItem& aItem ) + { + TRACE_FUNC_ENTRY; + + // Add this to old snapshot, if there's no old snapshot it must be created + if ( !iOldSnapshot ) + { + iOldSnapshot = new (ELeave) CSnapshotArray( KSnapshotGranularity ); + } + + LOGGER_WRITE_1( "Adding item %d.", aItem.ItemId() ); + + TRAPD( error, iOldSnapshot->InsertIsqL( aItem, iKey ) ); + if ( error == KErrAlreadyExists ) + { + // It was already committed, no actions required + LOGGER_WRITE( "iOldSnapshot->InsertIsqL leaved with KErrAlreadyExists" ); + } + else if ( error != KErrNone ) + { + LOGGER_WRITE_1( "iOldSnapshot->InsertIsqL leaved with %d.", error ); + User::Leave( error ); + } + iOldSnapshot->Compress(); + + TRACE_FUNC_EXIT; + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::ItemDeletedL +// Removes item to snapshot, this item is no longer considered deleted +// ----------------------------------------------------------------------------- +void CChangeFinder::ItemDeletedL( const TSnapshotItem& aItem ) + { + TRACE_FUNC_ENTRY; + + LOGGER_WRITE_1( "deleting item %d.", aItem.ItemId() ); + + if ( !iOldSnapshot ) + { + LOGGER_WRITE( "CChangeFinder::ItemDeleted leaved, no old snapshot." ); + User::Leave( KErrNotFound ); + } + + // Delete item from the old snapshot + TInt index; + if ( iOldSnapshot->FindIsq( aItem, iKey, index ) == KErrNone ) + { + iOldSnapshot->Delete( index ); + } + else // Skip, there wasn't such entry + { + LOGGER_WRITE( "iOldSnapshot->FindIsq, item was not found." ); + } + iOldSnapshot->Compress(); + + TRACE_FUNC_EXIT; + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::ItemUpdatedL +// Updates item to snapshot, this item is no longer considered changed +// ----------------------------------------------------------------------------- +void CChangeFinder::ItemUpdatedL( const TSnapshotItem& aItem ) + { + TRACE_FUNC_ENTRY; + + LOGGER_WRITE_1( "Updating item %d.", aItem.ItemId() ); + + // There must be such entry in the snapshot after this + // If there isn't old snapshot, we'll create it and add the item + if ( !iOldSnapshot ) + { + iOldSnapshot = new (ELeave) CSnapshotArray( KSnapshotGranularity ); + ItemAddedL( aItem ); + } + else + { + // Update item in the old snapshot + TInt index; + if ( iOldSnapshot->FindIsq( aItem, iKey, index ) == KErrNone ) + { + TSnapshotItem& oldItem = iOldSnapshot->At( index ); + oldItem = aItem; + } + else + { + // There was old snapshot but no such item. Let's add it + ItemAddedL( aItem ); + } + + } + iOldSnapshot->Compress(); + TRACE_FUNC_EXIT; + } + + +// ----------------------------------------------------------------------------- +// CChangeFinder::CommitChangesL +// Commits current changes to snapshot +// ----------------------------------------------------------------------------- +void CChangeFinder::CommitChangesL() + { + TRACE_FUNC_ENTRY; + + if ( !iCurrentSnapshot ) + { + LOGGER_WRITE( "CChangeFinder::CommitChangesL leaved, current snapshot missing." ); + User::Leave( KErrNotFound ); + } + + if ( !iOldSnapshot ) + { + iOldSnapshot = new (ELeave) CSnapshotArray( KSnapshotGranularity ); + } + + // Delete everything from the old snapshot + iOldSnapshot->Reset(); + + // Loop through all the items in current snapshot + TInt count = iCurrentSnapshot->Count(); + + // Copy everything from current to old snapshot + for ( TInt i = 0; i < count; i++ ) + { + // Commit it to the old array. + iOldSnapshot->InsertIsqL( iCurrentSnapshot->At( i ), iKey ); + } + TRACE_FUNC_EXIT; + } + + +// ----------------------------------------------------------------------------- +// CChangeFinder::CommitChangesL +// Commits current changes to snapshot, affects only a specified group of items +// ----------------------------------------------------------------------------- +void CChangeFinder::CommitChangesL( const MSmlDataItemUidSet& aUids ) + { + TRACE_FUNC_ENTRY; + + + // This function commits changes from current snapshot to old snapshot + // But commits only the entries in the parameter array + if ( !iCurrentSnapshot ) + { + LOGGER_WRITE( "CChangeFinder::CommitChangesL leaved, current snapshot missing." ); + User::Leave( KErrNotFound ); + } + + if ( !iOldSnapshot ) + { + iOldSnapshot = new (ELeave) CSnapshotArray( KSnapshotGranularity ); + } + + for ( TInt i = 0; i < aUids.ItemCount(); i++ ) + { + TSmlDbItemUid itemId = aUids.ItemAt( i ); + TSnapshotItem temp( itemId ); + TInt indexOld( -1 ); + TInt indexNew( -1 ); + TInt err = iOldSnapshot->FindIsq( temp, iKey, indexOld); + if ( !err ) + { + // founded from old snapshot + if ( !iCurrentSnapshot->FindIsq(temp, iKey, indexNew) ) + { + // Replace + iOldSnapshot->At( indexOld ) = iCurrentSnapshot->At( indexNew ); + } + else + { + // not found from current snapshot, delete from old also. + iOldSnapshot->Delete( indexOld ); + } + } + else + { + // not found from old snapshot, add it. + if ( !iCurrentSnapshot->FindIsq( temp, iKey, indexNew ) ) + { + iOldSnapshot->InsertIsqL( iCurrentSnapshot->At( indexNew ), iKey ); + } + } + } + TRACE_FUNC_EXIT; + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::SetNewSnapshot +// Sets new snapshot (to be compared against), ChangeFinder takes ownership +// ----------------------------------------------------------------------------- +void CChangeFinder::SetNewSnapshot( CSnapshotArray* aNewSnapshot ) + { + TRACE_FUNC_ENTRY; + + // Delete existing snapshot + delete iCurrentSnapshot; + + // Set submitted snapshot as active + iCurrentSnapshot = aNewSnapshot; + iCurrentSnapshot->Compress(); + + TRACE_FUNC_EXIT; + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::DataStoreUid +// returns stored data store id number +// ----------------------------------------------------------------------------- +TInt64 CChangeFinder::DataStoreUid() const + { + TRACE_FUNC; + return iDataStoreUid; + } + +// ----------------------------------------------------------------------------- +// CChangeFinder::SetDataStoreUid +// Sets data store id number +// ----------------------------------------------------------------------------- +void CChangeFinder::SetDataStoreUid( TInt64 aUid ) + { + TRACE_FUNC; + iDataStoreUid = aUid; + } +