gistfile1.groovy

import groovy.json.*

def structure = '''
{
    "name": "Unit 1 Keyname",
    "structuralName": "unit",
    "businessKey": "8a9d81d54017c6b1014017c6d4250021",
    "revision": 0,
    "meta": {
        "type": "UNIT"
    },
    "attributes": [
        {
            "name": "Title",
            "value": "Unit 1 Title"
        }
    ],
    "children": [
        {
            "name": "Lesson 1",
            "structuralName": "lesson",
            "businessKey": "8a9d81d54017c6b1014017c6d4b10024",
            "revision": 0,
            "meta": {
                "type": "COMPONENT"
            },
            "attributes": [
                {
                    "name": "Title",
                    "value": "Lesson 1 Title"
                }
            ],
            "children": [
                {
                    "name": "Activity Keyname",
                    "structuralName": "activity",
                    "businessKey": "8a9d81d54017c6b1014017c6d580002a",
                    "revision": 0,
                    "meta": {
                        "type": "ACTIVITY"
                    },
                    "attributes": [
                        {
                            "name": "Title",
                            "value": "Activity Title"
                        },
                        {
                            "name": "Teacher Guide",
                            "value": {
                                "name": "whatever",
                                "structuralName": "teacherGuide",
                                "businessKey": "8a9d81d54017c6b1014017c6d5e9002d",
                                "revision": 0,
                                "meta": {
                                    "type": "COMPONENT"
                                },
                                "attributes": [
                                    {
                                        "name": "Teacher Instruction",
                                        "value": "Some Instruction for the Teacher..."
                                    }
                                ],
                                "children": [
                                    
                                ],
                                "addenda": {
                                    "assets": [
                                        
                                    ]
                                }
                            }
                        },
                        {
                            "name": "A Number",
                            "value": 6
                        },
                        {
                            "name": "A Decimal",
                            "value": 3.1470000000
                        },
                        {
                            "name": "A Date",
                            "value": "0008-11-29T05:00:00+0000"
                        },
                        {
                            "name": "A Boolean",
                            "value": true
                        },
                        {
                            "name": "activityConfiguration",
                            "value": "{'type':'association','stimulus_list':['blue','green','red'],'possible_responses':['apple, grape, crayon']}"
                        }
                    ],
                    "children": [
                        
                    ],
                    "addenda": {
                        "assets": [
                            
                        ]
                    }
                }
            ],
            "addenda": {
                "assets": [
                    
                ]
            }
        },
        {
            "name": "Lesson 2",
            "structuralName": "lesson",
            "businessKey": "8a9d81d54017c6b1014017c6d5160027",
            "revision": 0,
            "meta": {
                "type": "COMPONENT"
            },
            "attributes": [
                {
                    "name": "Title",
                    "value": "Lesson 2 Title"
                }
            ],
            "children": [
                
            ],
            "addenda": {
                "assets": [
                    
                ]
            }
        }
    ],
    "addenda": {
        "assets": [
            
        ]
    }
}
'''

def json = new JsonSlurper().parseText(structure)

class CurriculumTransformer {

  static rules = []

  static def leftShift( Map rule ) {
    rules << rule
  }

  public CurriculumTransformer( Map json ) {
    
  }


}

class CurriculumStructureVisitor {

  def visit( element ) {

    def el = process(element) {
    el.children.each {
      visit( it )
    }
  
  }

  def process( el ) {
    rules.each { rule ->
        if ( rule.if( el ) ( {
          rule.then( el )
        }
    }
  }


}
      



CurriculumTransformer.rules << [  when: { it.meta.type == 'ACTIVITY' } ,  then : {  it.someValue = 'test' } ]
CurriculumTransformer.rules << [  when: { it.structuralName = 'cardStack' }, then : { it.children.all( it.meta.type == "ACTIVITY" ).*teacherGuide ) }