EnforcedCFOO allows coldfusion developers to create enforced contracts, therefore ensuring that data is reliable-- structure keys always exist with consistent value types. This is a little different from classic contracts, which use a class. Instead, objects are defined using functions.
This component aims to solve 3 problems: Reliability of objects, and reliability of the data type for each key, and general speed for building and maintaining large objects.
Here is a bare bones example to get you started.
// 1. `extend` `EnforcedCFOO` into a component.
// MyContracts.cfc
component extends="EnforcedCFOO" {
// 2. create a constraint
public struct function myFirstConstraint() {
return {
id: stringSetter // 3. add stuff to your constraints
};
}
}
// Test.cfc
component {
// 4. get your constraint for use wherever you need it.
public struct function getThisCoolThing() {
var contractHandler = new MyContracts();
// first, create a contract from one of your constraints
var simpleContract = contractHandler.create(contractHandler.myFirstConstraint);
// then, set it to whatever value you want
contractHandler.setProperty(simpleContract, "id", "my-id");
// now build out the contract
WriteDump(contractHandler.getData(simpleContract));
// now convert the contract to a structure for use wherever
return (contractHandler.getData(simpleContract));
}
}Let's say we have the following scenario, with a data structure defining a simple order:
var order = {
billing_address: {
address_1: "400 Test ave",
city: "High Point",
state: "NC",
zip: "27265"
},
delivery_address: {
address_1: "3923 Freeman Rd.",
address_2: "Apt G-12",
city: "Greensboro",
state: "NC",
zip: "27410"
},
is_verified = ""
};In the above example, we already have some consistency issues with the objects that make up an address. billing_address does not contain an address_2 field, while delivery_address does. We also have a potential reliability of data types issue, as is_verified would appear semantically to be a boolean, but is an empty string. Using EnforcedCFOO, we can solve both of these problems:
// OrderContracts.cfc
component extends="EnforcedCFOO" {
public struct function orderConstraint() {
return {
delivery_address: addressConstraint,
billing_address: addressConstraint,
is_verified: booleanSetter
};
}
public struct function addressConstraint() {
return {
address_1: stringSetter,
address_2: stringSetter,
city: stringSetter,
state: stringSetter,
post_code: stringSetter
};
}
}Now, we can create an Order.cfc to consume our objects:
// Order.cfc
component {
public struct function getOrder() {
var contractHandler = new OrderContracts();
var order = contractHandler.create(contractHandler.orderConstraint); // Create the order contract
return contractHandler.getData(order); // convert the order to a useable structure
}
}
Now, when we output getOrder(), we see the following structure:
// output of `getOrder()`
{
delivery_address: {
address_1: "",
address_2: "",
city: "",
state: "",
post_code: ""
},
billing_address: {
address_1: "",
address_2: "",
city: "",
state: "",
post_code: ""
},
is_verified: 0
}Let's say your user has an address book of saved addresses to ship to, as well. You could add a hashset of the addressConstraint to your object now and continue to have the same consistent data across all locations where address is used:
public struct function orderConstraint() {
return {
delivery_address: addressConstraint,
billing_address: addressConstraint,
is_verified: booleanSetter,
address_book: hashset(addressConstraint) // add in address_book hashset
};
}If you added a couple of hashes to the hashset, your output would now look something like this:
// output of `getOrder()`
{
delivery_address: {
address_1: "",
address_2: "",
city: "",
state: "",
post_code: ""
},
billing_address: {
address_1: "",
address_2: "",
city: "",
state: "",
post_code: ""
},
is_verified: 0,
address_book: [
{
address_1: "",
address_2: "",
city: "",
state: "",
post_code: ""
},
{
address_1: "",
address_2: "",
city: "",
state: "",
post_code: ""
}
]
}Now, let's say your brand expands into another country, so your addresses now have to be clearer. By adding country once to your addressConstraint, you effectively add the country field to all places that use that constraint:
public struct function addressConstraint() {
return {
address_1: stringSetter,
address_2: stringSetter,
city: stringSetter,
state: stringSetter,
post_code: stringSetter,
country: stringSetter // add in "country"
};
}The Result:
// output of `getOrder()`
{
delivery_address: {
address_1: "",
address_2: "",
city: "",
state: "",
post_code: "",
country: ""
},
billing_address: {
address_1: "",
address_2: "",
city: "",
state: "",
post_code: "",
country: ""
},
is_verified: 0,
address_book: [
{
address_1: "",
address_2: "",
city: "",
state: "",
post_code: "",
country: ""
},
{
address_1: "",
address_2: "",
city: "",
state: "",
post_code: "",
country: ""
}
]
}So, that is super cool, but a bunch defined data structures with no data doesn't help much! We need to be able to set data into the object. Setting properties can be accomplished using contractHandler.setProperty(specificContract, ..), or when working with hashes, using addHash.
contractHandler.setProperty(contractHandler.addressContract, "address_1", "300 Test St.");results in the output:
{
address_1: "300 Test St.",
address_2: "",
city: "",
state: "",
post_code: "",
country: ""
}Trying to set a property that doesn't exist fails silently:
contractHandler.setProperty(contractHandler.addressContract, "kitties", "Meow Meow");results in the unscathed output:
{
address_1: "",
address_2: "",
city: "",
state: "",
post_code: "",
country: ""
}Now that we know how to create and set a contract, how do we get the contract in a useable form? Use getData to convert the contract to a structure.
var order = contractHandler.getData(contractHandler.orderContract);
WriteDump(order); // see the struct to the orderThis example uses every type of setter, as well as an example of adding hashsets and setting properties. Check out the fully functional standalone example from the code below.
The OrderContracts.cfc is where we extend EnforcedCFOO and create all of our contracts. No logic exists in this component.
// OrderContracts.cfc
component extends="EnforcedCFOO" {
public struct function orderConstraint() {
return {
id: stringSetter,
delivery_address: addressConstraint,
billing_address: addressConstraint,
delivery_options: hashset(deliveryOptionConstraint),
accepted_cards: arraySetter,
has_payment: booleanSetter,
data: structSetter,
total: numberSetter,
phone: stringSetter
};
}
public struct function addressConstraint() {
return {
id: stringSetter,
address_1: stringSetter,
address_2: stringSetter,
city: stringSetter,
state: stringSetter,
post_code: stringSetter,
country: stringSetter
};
}
public struct function deliveryOptionConstraint() {
return {
id: numberSetter,
name: stringSetter,
price: numberSetter
};
}
}All of the logic for creating and adding data to our contracts exists in a second component, named Order.cfc.
// Order.cfc
component {
// return, and possibly initialize order contracts
private struct function getContractHandler(){
if(!structKeyExists(variables, "contracts")){
contractHandler = new OrderContracts(); // write contractHandler to the cfc's variable scope
}
return contractHandler;
}
// get an order.
public struct function getOrder(){
var contractHandler = getContractHandler();
var order = contractHandler.create(contractHandler.orderConstraint);
// set basic properties
contractHandler.setProperty(order, "id", createUUID()); // string
contractHandler.setProperty(order, "accepted_cards", ["visa", "mastercard", "discover"]); // array
contractHandler.setProperty(order, "has_payment", false); // boolean (will convert to `1` or `0`)
contractHandler.setProperty(order, "total", 27.34); // number
contractHandler.setProperty(order, "data", { // struct setting (not typically recommended)
account_standing: "good"
});
// set nested constraints
setBillingAddress(contractHandler.getProperty(order, "billing_address"));
setShippingAddress(contractHandler.getProperty(order, "delivery_address"));
// set a hashset
// setDeliveryOptions(contractHandler.getProperty(order, "delivery_options"));
return contractHandler.getData(order);
}
// set the billing address
private void function setBillingAddress(required any addressConstraint){
var contractHandler = getContractHandler();
contractHandler.setProperty(arguments.addressConstraint, "address_1", "123 Test st");
contractHandler.setProperty(arguments.addressConstraint, "address_2", "Apartment B-27");
contractHandler.setProperty(arguments.addressConstraint, "city", "High Point");
contractHandler.setProperty(arguments.addressConstraint, "state", "NC");
contractHandler.setProperty(arguments.addressConstraint, "post_code", "27265");
}
// set the shipping address
private void function setShippingAddress(required any addressConstraint){
var contractHandler = getContractHandler();
contractHandler.setProperty(arguments.addressConstraint, "address_1", "2000 Westmire Pt.");
contractHandler.setProperty(arguments.addressConstraint, "city", "Jamestown");
contractHandler.setProperty(arguments.addressConstraint, "state", "NC");
contractHandler.setProperty(arguments.addressConstraint, "post_code", "27262");
contractHandler.setProperty(arguments.addressConstraint, "cuntry", "USA");
}
// set some delivery options
private void function setDeliveryOptions(required any deliveryOptionsConstraint){
var contractHandler = getContractHandler();
var option = {};
for(var i = 1; i <= 3; i++){
option = contractHandler.create(contractHandler.deliveryOptionConstraint);
contractHandler.setProperty(option, "id", i);
contractHandler.setProperty(option, "name", "UPS");
contractHandler.setProperty(option, "price", i * 2.25);
contractHandler.addHash(arguments.deliveryOptionsConstraint, option);
}
}
}EnforcedCFOO is intended to be extended into a cfc whose only purpose is to contain a set of constraints, any of which can be turned into a contract by passing it in to create(). Each constraint is a simple function that describes a single object at a single depth (name/value pairs). Constraint names can be anything the developer would like, however the values must be either a setter, another constraint defined by the developer, or a hashset.
A setter simply means that there are no more contracts to check against for a given value; the key should contain a "simple" value, and not another contract. The following setters are available:
stringSetterarraySetterbooleanSetterstructSetternumberSetter
A HashSet is an array of objects with a defined contract to check against. For example, if I need to have a list of delivery options, I may have an array of deliveryOptionConstraints that contains the deliver by date, the cost, and an id. Setting this into a HashSet allows us to check against a predefined hash and ensure the data is reliable. HashSets have their own functions to work with them:
creates a hashset with the passed in constraint to check against. This is what should be used in constraint creation. For example, a constraint that wants to use a hashset should read:
public struct function orderConstraint() {
return {
id: stringSetter,
delivery_options: hashset(deliveryOptionConstraint)
};
}
This allows the developer to add a new contract to a hashset.
var option = contractHandler.create(deliveryOptionConstraint);
contractHandler.setProperty(option, "id", i);
contractHandler.setProperty(option, "name", "UPS");
contractHandler.setProperty(option, "price", i * 2.25);
contractHandler.addHash(contractHandler.deliveryOptionsContract, option);Get the current size (or length) of a hashset.
contractHandler.sizeHash(deliveryOptionsContract);Reset a hashset back to containing nothing.
contractHandler.clearHash(deliveryOptionsContract);Get the full contents of a hashset back.
contractHandler.getHash(deliveryOptionsContract);Now that our contracts are defined, we need to be able to get, set, and create them at will.
This method allows the developer to create a new contract for working in the code with. This method expects a constraint function to be passed in to it.
var order = contractHandler.create(contractHandler.orderConstraint);This method allows the developer to set a specific property in a given contract.
contractHandler.setProperty(order, "total", 27.34);This method allows the developer to get a specific property from a given contract.
contractHandler.getProperty(order, "total");This method converts the entire contract to a workable coldfusion structure. Typically this will be called at the end of all code manipulation for sending the enforced contracts off to the view or wherever it is needed.
contractHandler.getData(order);