Class PathExpressionRequestEvaluator

Implementation of IEvaluatesPathExpressionRequest which evaluates path expression requests.

Inheritance

System.Object

PathExpressionRequestEvaluator

Implements

IEvaluatesPathExpressionRequest

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: ZptSharp.Expressions.PathExpressions

Assembly: ZptSharp.dll

Syntax

public class PathExpressionRequestEvaluator : IEvaluatesPathExpressionRequest

Remarks

The main work done by this class is the parsing and splitting-up of the path expression into one or more PathExpression.AlternateExpression instances. Each of these is evaluated independently, in order, until either one succeeds in returning a result or until they have thrown an exception.

If an alternate expression returns a result then this is the result of the evaluation operation. If, on the other hand, we exhaust all of the alternate expressions and every one of them raises an exception, this the EvaluateAsync(PathExpressionEvaluationRequest, CancellationToken) method will itself raise an exception.

Constructors

PathExpressionRequestEvaluator(IGetsPathWalkingExpressionEvaluator, IParsesPathExpression)

Initializes a new instance of the PathExpressionRequestEvaluator class.

Declaration

public PathExpressionRequestEvaluator(IGetsPathWalkingExpressionEvaluator walkingEvaluatorFactory, IParsesPathExpression expressionParser)

Parameters

Type	Name	Description
IGetsPathWalkingExpressionEvaluator	walkingEvaluatorFactory	Path-walking evaluator.
IParsesPathExpression	expressionParser	Expression parser.

Methods

EvaluateAsync(PathExpressionEvaluationRequest, CancellationToken)

Evaluate the expression and return the result.

Declaration

public Task<object> EvaluateAsync(PathExpressionEvaluationRequest request, CancellationToken token = default(CancellationToken))

Parameters

Type	Name	Description
PathExpressionEvaluationRequest	request	Request.
System.Threading.CancellationToken	token	Token.

Returns

Type	Description
System.Threading.Tasks.Task<System.Object>	The async.

Implements

IEvaluatesPathExpressionRequest