OSID - osid.rules.RuleEvaluationSession Service Interface Definition

Interface	osid.rules.RuleEvaluationSession
Implements	`osid.OsidSession`
Used By	`osid.rules.RulesManager`
Used By	`osid.rules.RulesProxyManager`
Description	This session provides methods to evaluate and execute rules. An `Condition` is acquired for input into a `Rule` . The `ConditionRecords` in the `Condition` must be supplied to a specific `Rule` for its evaluation to be successful. Knowledge of a specific rule `Id` is also an agreement to the understanding of the required `ConditionRecords` as well as what is expected as a result. These record types may be inspected in the `ConditionRecord` and `ResultRecord` respectively.
Method	getEngineId
Description	Gets the `Engine` `Id` associated with this session.
Return	`osid.id.Id`		the `Engine Id` associated with this session
Compliance	`mandatory`		This method must be implemented.
Method	getEngine
Description	Gets the `Engine` associated with this session.
Return	`osid.rules.Engine`		the engine
Errors	OPERATION_FAILED		unable to complete request
Errors	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	canEvaluateRules
Description	Tests if this user can evaluate rules. A return of true does not guarantee successful authorization. A return of false indicates that it is known all methods in this session will result in a `PERMISSION_DENIED` . This is intended as a hint to an application that may opt not to offer these operations.
Return	`boolean`		`false` if evaluation methods are not authorized, `true` otherwise
Compliance	`mandatory`		This method must be implemented.
Method	getCondition
Description	Gets a condition for the given rule. The record `Types` in the `Condition` are required for a successful evaluation.
Parameters	`osid.id.Id`	`ruleId`	the `Id` of a `Rule`
Return	`osid.rules.Condition`		the returned `Condition`
Errors	NOT_FOUND		no `Rule` found with the given `Id`
	NULL_ARGUMENT		`ruleId` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
Compliance	`mandatory`		This method must be implemented.
Method	evaluateRuleOnCondition
Description	Evaluates a rule based on an input condition abd returns a boolean result.
Parameters	`osid.id.Id`	`ruleId`	a rule `Id`
Parameters	`osid.rules.Condition`	`condition`	input condition
Return	`boolean`		result of the evaluation
Errors	NOT_FOUND		`ruleId` is not found
	NULL_ARGUMENT		`ruleId` or `condition` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
	UNSUPPORTED		`condition` did not otiginate from `getConditionForRule()`
Compliance	`mandatory`		This method must be implemented.
Method	executeRuleOnCondition
Description	Executes a rule based on an input condition and returns a result.
Parameters	`osid.id.Id`	`ruleId`	a rule `Id`
Parameters	`osid.rules.Condition`	`condition`	input conditions
Return	`osid.rules.Result`		result of the execution
Errors	NOT_FOUND		an `Id` was not found
	NULL_ARGUMENT		`ruleId` or `condition` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure
	UNSUPPORTED		`condition` did not otiginate from `getConditionForRule()`
Compliance	`mandatory`		This method must be implemented.