public ConditionsController(IConditionService conditionService)
{
_initialCondition = new ConditionExpressionTree();
var conditions = new DynamicExpression[] { new ConditionAgeIs(), new ConditionGenderIs(), new ConditionFirstNameIs(), new ConditionLastNameIs(), new ConditionOrdersIs() }.ToList();
var rootBlock = new BlockConditionAndOr { AvailableChildren = conditions };
_initialCondition.Children = new DynamicExpression[] { rootBlock };
_conditionService = conditionService;
}
public IHttpActionResult SaveCondition(ConditionExpressionTree conditionTree)
{
//convert passed condition tree to Condition object
var condition = conditionTree.ToCondition(Guid.NewGuid().ToString());
//save it to the storage
_conditionService.Add(condition);
return Ok(condition);
}
public IHttpActionResult CustomersByConditions(ConditionExpressionTree conditions)
{
//get customers from repository
var customers = _customerRepository.Customers;
if (conditions != null)
{
//compile expression. note: you can now serialize it to save in repository
var compiledExpression = conditions.GetConditionExpression().Compile();
//filter customers: create context from customer data and pass it to the compiled expression
customers = customers.Where(customer => compiledExpression(customer.ToEvaluationContext()));
}
return Ok(customers);
}
public static ConditionExpressionTree ToInitialCondition(this ConditionExpressionTree deserializedCondition, ConditionExpressionTree initial)
{
//Fill AvailableChildren property by copying them from the initial because they not persisted while saving to reduce the serialized object
var sourceBlocks = (initial as DynamicExpression).Traverse(x => x.Children);
var targetBlocks = (deserializedCondition as DynamicExpression).Traverse(x => x.Children);
foreach (var sourceBlock in sourceBlocks)
{
foreach (var targetBlock in targetBlocks.Where(x => x.Id == sourceBlock.Id))
{
targetBlock.AvailableChildren = sourceBlock.AvailableChildren;
}
}
//copy available elements from etalon
deserializedCondition.AvailableChildren = initial.AvailableChildren;
return deserializedCondition;
}