Use the following procedure to define custom price calculations on resources and services.

1. Create your custom price calculator class

Create a class that implements the interface B25.Util_PluginManager.ReservationPrice. Implementing that interface means the class must have a method with the following signature:

void calculate(B25.Util_PluginManager.ReservationPriceData)

This method will be called whenever a reservation is saved, or whenever the reservation form gets re-rendered. You can control when the reservation form gets re-rendered, more on that in a bit. The B25.Util_PluginManager.ReservationPriceData object that gets passed along to the calculate method has two properties that will help you to make your own price calculation.

In the calculate method you will be able to set any fields on the reservation property record, such as the B25__Subtotal__c field, in order to control the final price of the reservation, or to start an approval process.

For the official documentation on how to write classes and how to implement interfaces go to: https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes.htm

2. Activate the custom price calculator class

Now, let Booker25 know that it should use your custom class instead of the default price calculation

To do this:

1. Go to Setup

2. Search for Custom Settings

3. Click Manage next to System Setting

4. Click New

5. Name the record Reservation Price Calculator Class, and for String Value enter the name of your custom price calculator class

As long as this setting exists, Booker25 will execute the calculate method every time the reservation form gets rerendered or when the reservation is saved.

3. (Optional) Control which fields trigger the calculation

By default, the following Reservation fields trigger the calculation whenever their value changes: Start, End, Base Price, Calculation Method, and Quantity. If you want to change which fields trigger the calculation, create a class that implements the interface B25.Util_PluginManager.ReservationPriceFields. Implementing that interface means the class must have a method with the following signature:

Set<String> getDependantFieldNames(B25.Util_PluginManager.ReservationPriceData)

To let Booker25 know about the existence of the class, either place it in the same class as your custom price calculator class or create a new custom setting just as in step 2, except this time name the new record Reservation Price Fields Class. For String Value enter the name of the class you created.

Sample Code

The sample code below adds the account field as one of the fields triggering calculation, besides all the default fields.

Then, in the actual calculation method, it sets the price to zero if the linked account is an Installation Partner.

global class MyCalculation implements B25.Util_PluginManager.ReservationPrice, B25.Util_PluginManager.ReservationPriceFields {
    
    public Set<String> getDependantFieldNames(B25.Util_PluginManager.ReservationPriceData data) {
        return new Set<String>{
        	'B25__Account__c',
            'B25__StartLocal__c',
        	'B25__EndLocal__c',
            'B25__Base_Price__c',
        	'B25__Quantity__c',
            'B25__Calculation_Method__c'
        };
    }

    public void calculate(B25.Util_PluginManager.ReservationPriceData data) {
        if (data.reservation.B25__Account__c == null) {
            return;
        }
        Account linkedAccount = [
            SELECT Type
            FROM Account
            WHERE Id = :data.reservation.B25__Account__c
        ];
        if (linkedAccount.Type == 'Installation Partner') {
            data.reservation.B25__Subtotal__c = 0;
        }
    }
}

Test code for class above

@IsTest
private class Test_MyCalculation {
    @IsTest static void priceCalculation() {
        Account testAccount = new Account(
            Name = 'name',
            Type = 'Installation Partner'
        );
        Database.insert(testAccount);
        
        B25__Reservation__c testReservation = new B25__Reservation__C(
            B25__Account__c = testAccount.Id,
            B25__StartLocal__c = DateTime.newInstance(2017, 1, 1, 4, 0, 0),
            B25__EndLocal__c = DateTime.newInstance(2017, 1, 2, 4, 0, 0),
            B25__Subtotal__c = 100
        );
        Database.insert(testReservation);
        
        B25.Util_PluginManager.ReservationPriceData rpd = new B25.Util_PluginManager.ReservationPriceData();
        rpd.reservation = testReservation;
        
        MyCalculation myCalculationClass = new MyCalculation();
        
        //Test the DependantFieldName class and checks that there are 6 fields returned
        Set<String> fields = myCalculationClass.getDependantFieldNames(rpd);
        System.assertEquals(6, fields.size());
		
        //Do the calculation and test that the price is 0 for this Account
        myCalculationClass.calculate(rpd);
        System.assertEquals(0, testReservation.B25__Subtotal__c);
    }
}

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