// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).+
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// All rights reserved.+
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// This component and the accompanying materials are made available+
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// under the terms of "Eclipse Public License v1.0"+
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// which accompanies this distribution, and is available+
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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//+
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// Initial Contributors:+
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// Nokia Corporation - initial contribution.+
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//+
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// Contributors:+
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//+
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// Description:+
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//+
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+
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#include "pairingscache.h"+
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#include "linkutil.h"+
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+
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/*static*/ CBTPairingsCache* CBTPairingsCache::NewL(MBTPairingsCacheObserver& aObserver, RBTRegServ& aRegServ)+
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	{+
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	CBTPairingsCache* self = new(ELeave) CBTPairingsCache(aObserver);+
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	CleanupStack::PushL(self);+
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	self->ConstructL(aRegServ);+
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	CleanupStack::Pop(self);+
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	return self;+
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	}+
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+
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CBTPairingsCache::CBTPairingsCache(MBTPairingsCacheObserver& aObserver)+
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	: iObserver(aObserver)+
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	{+
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	}+
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+
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void CBTPairingsCache::ConstructL(RBTRegServ& aRegServ)+
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	{+
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	iBTPairedBDAddrGetter = CBTPairedBDAddrGetter::NewL(*this, aRegServ);+
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	DoUpdateCache();+
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	}+
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+
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CBTPairingsCache::~CBTPairingsCache()+
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	{+
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	delete iBTPairedBDAddrGetter;+
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	iPairedBDAddrs.Close();+
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	}+
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+
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void CBTPairingsCache::UpdateCache()+
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	{+
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	// First we must cancel any outstanding request, as this will be called+
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	// when the registry has been modified an an external (API) user, and+
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	// so an in progress 'get' may have a stale view.+
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	iBTPairedBDAddrGetter->Cancel();+
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	DoUpdateCache();+
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	}+
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+
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void CBTPairingsCache::DoUpdateCache()+
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	{+
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    RemoveAllPairedDevices(); // Clear out the cache as it may be stale.+
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	iCacheState = EUpdateOutstanding;+
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	iBTPairedBDAddrGetter->Retrieve();+
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	}+
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+
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CBTPairingsCache::TPairingState CBTPairingsCache::IsPaired(const TBTDevAddr& aBDAddr)+
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	{+
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	// We initially assume that there is no pairing to the remote device.+
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    CBTPairingsCache::TPairingState ret = ENotPaired;+
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    +
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    // We determine whether they are in our pairing cache or not.+
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    TBool inPairingCache = InPairingCache(aBDAddr);+
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+
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	// Now we do some additional work based on the state of the cache.+
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	switch(iCacheState)+
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		{+
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	case EUpdateOutstanding:+
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		// If an update has been requested then we make them+
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		// wait for the answer.+
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		ret = EDeferred;+
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		break;+
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	case EUpdateFailed:+
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		// If we failed last time we should try again, and tell+
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		// them to wait for the answer.+
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		DoUpdateCache();+
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		ret = EDeferred;+
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		break;+
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	case EValid:+
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		// If the cache is valid then either we are paired or+
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		// we aren't, the answer to which is based on whether they+
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		// are in the cache or not.+
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		break;+
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	default:+
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		Panic(EBTPairingsCacheBadState);+
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		break;+
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		}+
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+
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	// If we were already in the cache then that means there must be a pairing.+
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	if(inPairingCache)+
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		{+
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		ret = EPaired;+
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		}+
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+
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	// If we are deferring the decision about whether paired or not, then we +
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	// need to remember that we should inform the observer when we have +
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	// completed our attempt at getting an answer.+
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	if(ret == EDeferred)+
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		{+
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		iDeferredDecision = ETrue;+
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		}+
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+
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	return ret;+
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	}+
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+
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TBool CBTPairingsCache::InPairingCache(const TBTDevAddr& aBDAddr)+
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	{+
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	return (PairedDeviceIndex(aBDAddr) >= 0) ? ETrue : EFalse;+
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	}+
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+
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/**+
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Wrapper for TBTDevAddr's == operation.+
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This is needed by the TIdentityRelation parameter in RArray's Find method.+
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*/+
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/*static*/ TBool CBTPairingsCache::AreBDAddrsEqual(const TBTDevAddr& aA, const TBTDevAddr& aB)+
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	{+
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	return aA == aB;+
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	}+
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+
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/**+
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Returns either the index of the remote device address in the+
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paired device address list if the specified address is+
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included therein or KErrNotFound if not+
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*/+
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TInt CBTPairingsCache::PairedDeviceIndex(const TBTDevAddr& aBDAddr)+
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	{+
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	TIdentityRelation<TBTDevAddr> rel(AreBDAddrsEqual);+
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	return iPairedBDAddrs.Find(aBDAddr, rel);+
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	}+
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+
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TInt CBTPairingsCache::AddPairedDevice(const TBTDevAddr& aAddr)+
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	{+
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    __ASSERT_DEBUG(aAddr!=0, Panic(EBTConnectionBadDeviceAddress));+
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	+
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	TInt err = KErrNone;+
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	if(!InPairingCache(aAddr))+
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		{+
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		err = iPairedBDAddrs.Append(aAddr);+
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		}+
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	return err;+
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	}+
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+
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void CBTPairingsCache::RemoveAllPairedDevices()+
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	{+
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	for(TInt i=iPairedBDAddrs.Count()-1; i>=0; i--)+
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		{+
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		iPairedBDAddrs.Remove(i);+
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		}+
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	}+
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+
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void CBTPairingsCache::InformObserver(TInt aError)+
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	{+
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    // Ensure that we inform the observer only if they have been deferred.+
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	if(iDeferredDecision)+
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		{+
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		iDeferredDecision = EFalse;+
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		iObserver.MbpcoDeferredDecisionResolved(aError);+
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		}+
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	}+
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+
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/*virtual*/ void CBTPairingsCache::MbpdnAddPairedDevices(const RBTDeviceArray& aAddrs)+
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	{+
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	__ASSERT_DEBUG(iCacheState == EUpdateOutstanding, Panic(EBTPairingsCacheBadState));+
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	+
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	// check that the cache is still empty+
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	__ASSERT_DEBUG(iPairedBDAddrs.Count() == 0, Panic(EBTPairingsCacheNotEmpty));+
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	+
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	TInt err = KErrNone;+
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+
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	TInt count = aAddrs.Count();+
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	for (TInt i=0; i<count; i++)+
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		{+
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		err = AddPairedDevice(aAddrs[i]->BDAddr());+
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		if(err != KErrNone)+
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			{+
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			break;+
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			}+
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		}+
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+
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	// We handle add failures ourselves.+
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	iCacheState = (err == KErrNone) ? EValid : EUpdateFailed;+
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+
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	// We inform the observer, even if there was an error because it is+
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	// possible that we managed to get the address they were after.+
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	InformObserver(err);+
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	}+
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+
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/*virtual*/ void CBTPairingsCache::MbpdnErrorInGettingPairedDevices(TInt aError)+
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	{+
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	__ASSERT_DEBUG(iCacheState == EUpdateOutstanding, Panic(EBTPairingsCacheBadState));+
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	// Current cache should be ok - we should have cleared it before a getter is+
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	// started.  This simply sets the flag to indicate that the current (empty) cache +
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	// is either complete if aErr is KErrNotFound (or KErrNone) or incomplete+
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	// if aErr is anything else. In the latter case if the cache is needed in future +
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	// another getter should be kicked off.+
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	TInt err = (aError != KErrNone && aError != KErrNotFound) ? aError : KErrNone;+
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	if(err != KErrNone)+
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		{+
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		iCacheState = EUpdateFailed;+
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		}+
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	else+
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		{+
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		iCacheState = EValid;+
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		}+
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	+
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	// Ensure that if we have been queried about the pairings and deferred the+
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	// client, they must be informed.+
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	InformObserver(err);+
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	}+
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+
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