persistentstorage/store/UBTREE/UB_NODE.CPP
changeset 0 08ec8eefde2f
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/persistentstorage/store/UBTREE/UB_NODE.CPP	Fri Jan 22 11:06:30 2010 +0200
@@ -0,0 +1,97 @@
+// Copyright (c) 1998-2009 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:
+//
+
+#include "UB_STD.H"
+
+EXPORT_C void MBtreeNodeOrg::Init(TAny* aNode) const
+//
+// Default node initialisation just zero filling.
+//
+	{
+	Mem::FillZ(aNode,KPoolPageSize);
+	}
+
+EXPORT_C TBool MBtreeLeafOrg::Search(const TAny* aNode,const TAny* aKey,const MBtreeKey& aComp,TBool aLast,TInt& aPos) const
+//
+// Default to using a binary search through the node, using KeyAt and the key's comparison.
+// if aLast is 1, aEntry is the first > the key, return true if previous entry is a match
+// if aLast is 0, aEntry is the first entry >= the key, return true is current entry is a match
+//
+	{
+	TInt match=EFalse;
+	TInt rr=LastEntry(aNode)-1;
+	TInt ll=0;
+	__ASSERT_DEBUG(rr>=-1,Panic(EBadEntryCount));
+	while (ll<=rr)
+		{
+		TInt mm=(rr+ll)>>1;
+		TInt res=aComp.Compare(aKey,aComp.Key(EntryPtr(aNode,mm)));
+		if (res==0)
+			match=ETrue;
+		if (res+aLast<=0)
+			rr=mm-1;		// compare < 0 or match and aLast=0
+		else
+			ll=mm+1;		// compare > 0 or match and aLast=1
+		}
+	aPos=ll;
+	return match;
+	}
+
+EXPORT_C TBool MBtreeLeafOrg::InsertOverflow(TAny*,TAny*,TInt,TBool,const TDesC8&) const
+//
+// For simple implementations allow this to be unimplemented. Report failure
+//
+	{
+	return EFalse;
+	}
+
+EXPORT_C TBool MBtreeIndexOrg::Search(const TAny* aNode,const TAny* aKey,const MBtreeKey& aComp,TBool aLast,TInt& aPos) const
+//
+// Default to using a binary search through the node, using KeyAt and the key's comparison.
+// if aLast is 1, aEntry is the first > the key
+// if aLast is 0, aEntry is the first entry >= the key
+//
+	{
+	TInt rr=LastEntry(aNode);
+	TInt ll=-1;
+	__ASSERT_DEBUG(rr>0,Panic(EBadEntryCount));
+	while (rr>ll+1)
+		{
+		TInt mm=(rr+ll)>>1;
+		if (aComp.Compare(aKey,EntryPtr(aNode,mm))+aLast<=0)
+			rr=mm;		// compare < 0 or match and aLast=0
+		else
+			ll=mm;		// compare > 0 or match and aLast=1
+		}
+	aPos=rr;
+	return EFalse;		// return not used
+	}
+
+EXPORT_C TBool MBtreeIndexOrg::InsertOverflow(TAny*,TAny*,TInt,TBool,const TDesC8&,TPageRef,const TDesC8&,TBtreePivot&) const
+//
+// For simple implementations allow this to be unimplemented. Report failure.
+//
+	{
+	return EFalse;
+	}
+
+EXPORT_C TBool MBtreeIndexOrg::Update(TAny*,TInt,const TDesC8&) const
+//
+// Allow to be unimplemented. Return failure.
+//
+	{
+	return EFalse;
+	}
+