--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mds_plat/metadata_engine_api/inc/mdecondition.h Wed Oct 06 15:08:08 2010 +0300
@@ -0,0 +1,151 @@
+/*
+* 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: Base class for all search condition tree nodes.
+*
+*/
+
+
+#ifndef __MDECONDITION_H__
+#define __MDECONDITION_H__
+
+
+#include <e32base.h>
+
+#include <mdccommon.h>
+
+// Forward declaration
+class CMdCSerializationBuffer;
+
+/**
+ * Base class for all search condition tree nodes.
+ */
+NONSHARABLE_CLASS(CMdECondition) : public CBase
+ {
+public:
+
+ /* Destructor. */
+
+ /**
+ * Destructor.
+ */
+ virtual ~CMdECondition();
+
+
+ /* Methods. */
+
+ /**
+ * Returns the type of the condition.
+ *
+ * @return Condition type.
+ */
+ IMPORT_C TConditionType Type() const;
+
+ /**
+ * Determines whether the condition is negated.
+ *
+ * @return <code>ETrue</code>, if the condition is negated.
+ * Otherwise <code>EFalse</code>.
+ */
+ IMPORT_C TBool Negate() const;
+
+ /**
+ * Sets the negate flag. The negate flag negates the meaning of the
+ * condition like a boolean NOT operator.
+ *
+ * @param aNegate <code>ETrue</code> to negate.
+ */
+ IMPORT_C void SetNegate(TBool aNegate);
+
+ /**
+ * Determines whether the condition node has been locked. Attempting to
+ * modify locked conditions causes a panic.
+ *
+ * @return <code>ETrue</code>, if the condition is locked. Otherwise
+ * <code>EFalse</code>.
+ */
+ IMPORT_C TBool Locked() const;
+
+ /**
+ * Locks the condition to prevent changes. Attempting to change a locked
+ * condition causes a panic.
+ *
+ * @param aLocked <code>ETrue</code> to lock; <code>EFalse</code> to
+ * unlock.
+ */
+ IMPORT_C virtual void SetLocked(TBool aLocked = ETrue);
+
+ /**
+ * Get possible query's internal optimization flags from condition.
+ *
+ * @param aFlaga query's internal optimization flags
+ * @return last level internal optimization flags
+ */
+ virtual TUint32 InternalQueryOptimizationFlags(TUint32& aFlags) = 0;
+
+ /**
+ * Get required size of serialized buffer when this is serialized.
+ *
+ * @return required size of serialized buffer
+ */
+ virtual TUint32 RequiredBufferSize() const = 0;
+
+ /**
+ * Serialize own data to serialized buffer (correct position must be set
+ * before calling).
+ *
+ * @param aBuffer serialized buffer.
+ */
+ virtual void SerializeL(CMdCSerializationBuffer& aBuffer,
+ TMdCOffset& aFreespaceOffset) const = 0;
+
+ /* Constructors. */
+
+ /**
+ * Constructor.
+ *
+ * @param aType Type of the condition node.
+ */
+ CMdECondition(TConditionType aType);
+
+protected:
+ /**
+ * Second-phase constructor.
+ */
+ void ConditionConstruct();
+
+
+ /* Utility methods. */
+
+ /**
+ * Panics if the condition is not locked.
+ *
+ * @panic TMdEPanic::EConditionLocked Condition is locked against
+ * changes.
+ */
+ void AssertNotLocked() const;
+
+protected:
+
+ /** Type of the condition. */
+ TConditionType iType;
+
+ /** The negate flag negates the result of the condition: if the
+ condition evaluates to True, the result will really be False. */
+ TBool iNegated;
+
+ /** Locked conditions can't be modified. */
+ TBool iLocked;
+ };
+
+#endif // __MDECONDITION_H__