rule-parser-engine

Rules Engine

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Author : Digi-Corp (Ashish & Chandrakant)

Created on : 2th Nov 2015

This Rules Engine is used to bind the rules and gets the result based on rules. It have 'RulesEngine()' function which returns 'RE' Object. You require to import 'assertHelper.js' file for use this rules engine library.It is also require user to set defaultResult before using getResult() method.

• Create Instance Of RulesEngine
• Useful Functions
  • addRule()
  • removeRule()
  • getResult()
  • print()
  • getRule()
  • getAllRules()
• variable
  • defaultResult

Create Instance Of RulesEngine

To use RulesEngine Library you require to create RulesEngine instance through that you can call it's functions.

• Example

  var RulesEngine = new RulesEngine();

Here 'RulesEngine' is instance through this you can Call RulesEngine functions.

addRule(rule,result)

This method is used to add rules into 'RulesEngine' Object.It returns index of current rule into 'RulesEngine' object

Parameter Name	Descriptions
rule	This contains array of JSON objects that defines rule
result	This contains JSON objects that defines result with respect to given rule

• Attributes for rule and result Object

Parameter	Attributes	DataType	Possible Values
rule	field	string	Any
	filterType	string	between, in, notin, lt, lteq, gt, gteq, eq, nteq
	value	array	Any
result	Any	Any	Any

• Example

  RulesEngine.addRule([{field:"growth",filterType:"between",value:[26, 35]},
                        {field:"slope",filterType:"between",value:[26,35]}],
                          {'Color': '#1A9850','Comment': 'Between'});

  Here,rule is binded for
  

  1> growth is Between 26 to 35.
  

  2> slope is Between 26 to 35.

  with result 'Color'='#1A9850' and 'Comment'='Between'

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removeRule(index)

This method is used to remove the rule from specific index of 'RulesEngine' object.

Parameter Name	Descriptions
index	This defines index of rules into 'RulesEngine' object

• Example

    RulesEngine.removeRule(0);

Here, It will remove first rule from index 0 of 'RulesEngine' object.

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getResult(values)

This method compare the given value with predefined rules and gives result object based on comaprision

Parameter Name	Descriptions
values	This defines JSON object which contains values to be compare against rules.

• Example

RulesEngine.addRule([{field:"growth",filterType:"between",value:[26, 35]},
                      {field:"slope",filterType:"between",value:[26,35]}],
                        {'Color': '#1A9850','Comment': 'Between'});
 
retRestult=RulesEngine.getResult({growth:26,slope:29});
 

Here,

retRestult.Color contains '#1A9850' and retRestult.Comment contains 'Between'

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print()

This method print Entire rules with result and also defaultResult.

• Example

RulesEngine.print()

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defaultResult

defaultResult variable defines default result when no rules mathced.You must require to set default result before use getResult method.

• Example

RulesEngine.defaultResult={'Color': '#D73027','Comment': 'Default Message'};

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getRule(index)

This method is used to get rule from specific index.

Parameter Name	Descriptions
index	This defines index of rules into 'RulesEngine' object

• Example

RulesEngine.getRule(0)

Here, It will return first rule from index 0 of 'RulesEngine' object.

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getAllRules()

This method is used to get all rules of 'RulesEngine' object.

• Example

RulesEngine.getAllRules()

Here, It will return all rules of 'RulesEngine' object.