Referencing external logic

Contents

◷ Reading Time: 3 minutes

Introduction

In the application, you may need to define some commonly used logic and then start reusing this. This separation can happen in two layers:

Splitting into different Logic inside a Validation
Splitting into Logic outside the Validation

Common logic

you may find Common logic useful for multiple Validations. For instance, IsNullOrEmpty, IsInRange,… You may implement this and reuse it inside a Validation or cross multiple Validations. If you want to use it across multiple Validations, you need to use the Include command to reference external logic to a Validation.

RuleSet and ModelContainer

In order to create a RuleSet, you simply load your ModelContainer and add it to a RuleSet collection using the AddRule method.

private RuleSet GetRuleSet()
{
    RuleSet rs = RuleSet.HierarchicalRuleSet();
    rs.AddModel("Common/Strings", LoadAdapterUtility.LoadModel("Common.IsNullOrEmpty.xml"));
    return rs;
}

Then you can use the RuleSet to create your Validator

private Validator GetValidator()
{
    RuleSet rs = GetRuleSet();
    // append new logic to ruleset
    rs.AddModel("rules/validations", LoadAdapterUtility.LoadModel("Conditional_requiredField_UsingCommonRules.xml"));
 
    // creating Validator directly, or we could use RuntimeEngine instead
    var validator = new Validator(rs, "ruleset://rules/validations/PersonValidation");
    return validator;
}

Direct file reference

Final Sample

<Logic name="NullOrEmpty" variable="$input">
  <Or>
    <Null value="$input"/>
    <Empty value="$input"/>
  </Or>
</Logic>

Referencing use RuleSet and ModelContainer

<Validation name="PersonValidation">
  <!-- Referencing external logic -->
  <Include source="ruleset://Common/Strings/NullOrEmpty"/>
 
  <Logic name="check email using False">
    <False message="Adult must have an email">
      <When>
        <And processAll="true">
          <Check value= "Age>=18"/>
          <Validate logic="NullOrEmpty" value="Email"/>
        </And>
      </When>
    </False>
  </Logic> 
</Validation>

Next sections

In the next couple of articles, we will cover different aspects of modeling and executing the validation rules using Validation logic.

Updated on April 6, 2020

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