author | William Roberts <williamr@symbian.org> |
Tue, 16 Mar 2010 16:12:26 +0000 | |
branch | Symbian2 |
changeset 2 | 2fe1408b6811 |
parent 0 | 061f57f2323e |
child 4 | 837f303aceeb |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008 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 the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.symbianfoundation.org/legal/licencesv10.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: Channel condition object |
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* |
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*/ |
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#ifndef SENSRVCHANNELCONDITION_H |
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#define SENSRVCHANNELCONDITION_H |
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// INCLUDES |
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#include <e32base.h> |
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// FORWARD DECLARATIONS |
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class CSensrvChannelCondition; |
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// DATA TYPES |
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/** |
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* RPointerArray based channel condition list |
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*/ |
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typedef RPointerArray<CSensrvChannelCondition> RSensrvChannelConditionList; |
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/** |
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* Defines condition type. |
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* |
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* Conditions can be standalone conditions or a part of a two-part condition. |
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* |
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* - ESensrvLimitCondition is a standalone condition which has a limit. This kind of condition |
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* is met when the observed value exceeds or equals the condition value, depending on the |
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* operator used in the condition. |
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* - ESensrvRangeConditionLowerLimit is the first part of a two-part range condition. This kind |
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* of condition is met when the observed value is between specified lower and upper limits or |
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* beyond specified range, depending on the operators used in the two conditions that make up |
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* the range. |
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* A condition set that contains ESensrvRangeConditionLowerLimit condition must also contain |
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* ESensrvRangeConditionUpperLimit condition using the same index. Both lower and upper limit |
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* operators must have different direction, i.e. if lower limit has "less than" operator, then |
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* upper limit must have "greater than" operator, and vice versa. ESensrvOperatorEquals operator |
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* is not valid for range condition. |
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* - ESensrvRangeConditionUpperLimit is the second part of a two-part range condition. |
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* - ESensrvBinaryCondition is used for channels that provide bitmask values (typically event |
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* channels). ESensrvOperatorBinaryXxx operations can only be used with this condition type. |
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* |
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* @see CSensrvChannelCondition |
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* @see TSensrvConditionOperator |
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*/ |
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enum TSensrvConditionType |
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{ |
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/** Standalone condition which has a limit */ |
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ESensrvSingleLimitCondition = 0, |
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/** 1st part of a two-part range condition. 2nd part is ESensrvRangeConditionUpperLimit */ |
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ESensrvRangeConditionLowerLimit, |
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/** 2nd part of a two-part range condition. 1st part is ESensrvRangeConditionLowerLimit */ |
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ESensrvRangeConditionUpperLimit, |
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/** Standalone condition for binary operations */ |
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ESensrvBinaryCondition |
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}; |
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/* |
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* Defines condition operator |
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* |
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* For a range condition a ConditionSet must contain 2 Conditions each with an operator in a |
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* different direction. i.e. There must be matching greater than and less than pair. Also the pair |
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* of conditions must have the same index in the ConditionSet. |
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* |
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* - ESensrvOperatorEquals checks if the value got from the sensor is equal to the set value. This is |
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* not a valid operator for a range condition. |
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* - ESensrvOperatorGreaterThan checks if the value got from the sensor is greater than the set limit. |
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* This is not a valid operator for a binary condition. |
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* - ESensrvOperatorGreaterThanOrEquals checks if the value got from the sensor is greater than or equal |
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* to the set limit. This is not a valid operator for a binary condition. |
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* - ESensrvOperatorLessThan checks if the value got from the sensor is less than the set limit. This is |
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* not a valid operator for a binary condition. |
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* - ESensrvOperatorLessThanOrEquals checks if the value got from the sensor is less than or equal to the |
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* set limit. This is not a valid operator for a binary condition. |
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* - ESensrvOperatorBinaryAnd checks if a bitmask data value got from the sensor has set at least one of |
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* the bits set in the condition value. In other words, if result of datavalue & conditionvalue != 0, |
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* there is a match. This is not a valid operator for a single limit or range conditions. |
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* |
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* Example: |
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* Condition value: 01101101 |
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* Data value: 10001010 |
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* Resulting value: 00001000 -> Non-zero, which indicates a match. |
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* - ESensrvOperatorBinaryAll checks if a bitmask data value got from the sensor has set all of the bits |
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* set in the condition value. The rest of the data value bits are ignored. In other words, if |
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* datavalue & conditionvalue == conditionvalue, there is a match. Not a valid operator for a single limit |
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* or range conditions. |
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* Example: |
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* Condition value: 01101101 |
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* Data value: 10001010 |
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* Resulting value: 00001000 -> Not equal to condition value -> Not a match. |
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* |
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* @see CSensrvChannelCondition |
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* @see TSensrvConditionType |
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*/ |
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enum TSensrvConditionOperator |
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{ |
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ESensrvOperatorEquals = 0, |
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ESensrvOperatorGreaterThan, |
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ESensrvOperatorGreaterThanOrEquals, |
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ESensrvOperatorLessThan, |
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ESensrvOperatorLessThanOrEquals, |
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ESensrvOperatorBinaryAnd, |
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ESensrvOperatorBinaryAll |
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}; |
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// CLASS DECLARATION |
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/** |
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* CSensrvChannelCondition represents a channel condition item. Channel conditions are added to a channel |
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* condition set. A channel condition set is met when all channel conditions are met at the same time, if it |
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* is AND-type set, or when single condition is met if it is OR-type set. Only one channel condition can be |
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* set for each data item in single channel condition set. Certain condition types (range conditions) require |
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* two condition objects (upper and lower limit) in a condition set for the set to be valid. The pair of |
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* conditions must both have the same index in the condition set and they are considered a single channel |
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* condition. |
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* |
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* Each Condition has an ItemIndex associated with it. When a Condition is added to a Condition Set using |
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* CSensrvChannelConditionSet::AddChannelConditionL() this index must be different to all other conditions |
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* added to the set with the exception of range conditions as described above. If the index supplied already |
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* exists and the condition is not part of a range condition then |
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* CSensrvChannelConditionSet::AddChannelConditionL() leaves with KErrArgument. |
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* |
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* @see CSensrvChannelConditionSet |
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* @see TSensrvConditionType |
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* @see TSensrvConditionOperator |
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* @lib sensrvutil.lib |
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* @since S60 5.0 |
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*/ |
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NONSHARABLE_CLASS( CSensrvChannelCondition ): public CBase |
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{ |
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public: |
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/** |
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* Two-phase constructor |
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* |
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* @param aConditionType Defines the type of the condition |
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* @param aConditionOperator Defines the operator used in the condition |
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* @param aItemIndex Item index to be used in the condition evaluation |
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* @param aValue Value to be used in condition evaluation. By default this should be a packaged data |
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* object of the channel. See the channel specific headers in \epoc32\include\sensors\channels. |
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* If the channel type requires a different type of value, that must be indicated clearly in |
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* the channel specific header defining the channel. |
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* @return Pointer to created object |
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* @leave KErrNoMemory |
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* @leave KErrArgument if parameters are invalid or are less than 0 |
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* @leave One of the system-wide error codes |
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*/ |
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IMPORT_C static CSensrvChannelCondition* NewL |
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( TInt aConditionType, |
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TInt aConditionOperator, |
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TInt aItemIndex, |
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TDesC8& aValue ); |
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|
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/** |
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* Two-phase constructor |
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* |
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* @param aConditionType Defines the type of the condition |
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* @param aConditionOperator Defines the operator used in the condition |
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* @param aItemIndex Item index to be used in the condition evaluation |
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* @param aValue Value to be used in condition evaluation. By default this should be a packaged data |
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* object of the channel. See the channel specific headers in \epoc32\include\sensors\channels. |
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* If the channel type requires a different type of value, that must be indicated clearly in |
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* the channel specific header defining the channel. |
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* @return Pointer to created object |
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* @leave KErrNoMemory |
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* @leave KErrArgument if parameters are invalid or are less than 0 |
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* @leave One of the system-wide error codes |
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*/ |
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IMPORT_C static CSensrvChannelCondition* NewLC |
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( TInt aConditionType, |
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TInt aConditionOperator, |
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TInt aItemIndex, |
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TDesC8& aValue ); |
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public: |
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/** |
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* Get condition type |
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* |
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* @return Condition Type |
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*/ |
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virtual TInt ConditionType() const = 0; |
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/** |
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* Get condition operator |
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* |
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* @return TInt Condition operator |
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*/ |
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virtual TInt ConditionOperator() const = 0; |
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/** |
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* Get condition item index |
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* |
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* @return TInt Condition item index |
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*/ |
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virtual TInt ConditionItemIndex() const = 0; |
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/** |
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* Get condition value. |
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* |
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* @param aValue Value of the condition is copied to the supplied descriptor |
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* @return KErrOverflow if aData is the wrong size for data item or one of the system-wide error codes |
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*/ |
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virtual TInt GetConditionValue( TDes8& aValue ) const = 0; |
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/** |
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* Get condition value as reference. |
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* |
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* @return Reference to condition value descriptor. |
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*/ |
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virtual const TDesC8& ConditionValue() const = 0; |
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public: |
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/** |
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* Default constructor. |
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*/ |
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CSensrvChannelCondition(); |
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}; |
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#endif //SENSRVCHANNELCONDITION_H |
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// End of File |
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