Soft Constraints in the DSL Tools in C#

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Soft Constraints in the DSL Tools
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[ValidationState(ValidationStateEnabled)] partial class MyDomainClass {
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You can either add this attribute using the CLRAttributes property of a class in the DSL designer and have it generated into your code or, more simply, add it on the hand-written partial class that hosts the validation method 2 Each validation method must be marked with a ValidationMethod custom attribute
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[ValidationMethod(ValidationCategoryOpen|ValidationCategorySave)]
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In this case, you can see that the method is requesting that it is called at the time the designer opens model les and saves them This two-factor identi cation of methods is functionally redundant, because clearly all classes hosting validation methods can be identi ed when validation rst occurs However, to increase performance, especially on initial le open, this extra marker is used to reduce the set of classes that are scanned File open and le save are not the only times that a validation can be applied Let s take a look at a further, richer example When de ning a state machine such as that for Issues, it can be useful to make sure that all of your IssueStates are reachable, that is, that they are either start states or they can be reached as the next state of some other state This is quite easy to verify visually when the state diagram is small, but when things get complex, it can be easy to miss that a particular state only has outgoing rather than any incoming links Here s the code for a validation method to do this:
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[ValidationMethod(ValidationCategoryMenu)] private void ValidateStatesReachable(ValidationContext context) { List<IssueState> unvisitedStates = new List<IssueState>(); // First locate the start state // Also make a complete set of states not yet visited IssueState startState = null; foreach (IssueState state in thisStates) {
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7: Constraints and Validation
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if (stateKind == StateKindStart) { if (startState != null) { // Multiple start states is a different validation // and will confuse this rule return; } startState = state; } unvisitedStatesAdd(state); } if (startState == null) { contextLogError("Start state not specified", "Err 02" ); return; } // // // // // Beginning with the Start state, follow Next links At each state, add the Next links to the statesToVisit queue Remove every state we visit from unvisitedStates If we get to the end of the list and there are states still unvisited, they must be unreachable
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Queue<IssueState> statesToVisit = new Queue<IssueState>(); statesToVisitEnqueue(startState); while (statesToVisitCount > 0) { IssueState visiting = statesToVisitDequeue(); if (unvisitedStatesContains(visiting)) { unvisitedStatesRemove(visiting); foreach ( IssueState nextState in visitingNext ) { statesToVisitEnqueue(nextState); } } } if (unvisitedStatesCount > 0) { IssueState[] unreachable = unvisitedStatesToArray(); contextLogWarning("States unreachable from start state", "Err 03", unreachable); } }
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Soft Constraints in the DSL Tools
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You can see that this time, the attribute specifies a different time for the validation to run:
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[ValidationMethod(ValidationCategoryMenu)]
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Validations are put into categories that determine when they are evaluated ValidationCategoryMenu indicates that the method should be run when a Validate context menu on the diagram surface or the model explorer is selected The ValidationCategory enumeration literals can be combined using the logical OR operator to mix and match the times that a validation method is run The LogWarning() method is used on the ValidationContext to provide a less urgent message to the end user The ValidationContext object provides the following public methods and properties:
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public class ValidationContext { public ValidationCategory Category { get; } public ReadOnlyCollection<string> CustomCategories { get; } public ReadOnlyCollection<ValidationMessage> CurrentViolations { get; } public ReadOnlyCollection<ModelElement> ValidationSubjects { get; } public ValidationMessage LogError(string description, string code, params ModelElement[] elements); public ValidationMessage LogMessage(string description, string code, params ModelElement[] elements); public ValidationMessage LogWarning(string description, string code, params ModelElement[] elements); }
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The ValidationSubjects, Category, and CustomCategories properties allow sophisticated validation methods to be written that vary their functionality based on the type of validation currently being requested and the exact set of elements being validated, for example, to check if the elements within a particular selection are uniquely named
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