diff -r fe894bb075c2 -r 79f826a55db2 mds_plat/metadata_engine_api/inc/mdecondition.h
--- /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__