Trigger Handler Template

Use Case: Basic trigger handler with Domain layer delegation

Template:

/**
 * Trigger handler for [ObjectName] object
 * Delegates to Domain layer for validation and Service layer for complex workflows
 */
public with sharing class [ObjectName]TriggerHandler {
    
    /**
     * Handles before insert events
     * @param newRecords List of new [ObjectName] records
     */
    public static void handleBeforeInsert(List<[ObjectName]> newRecords) {
        [ObjectName]Domain.validateForInsert(newRecords);
    }
    
    /**
     * Handles before update events
     * @param newRecords List of updated [ObjectName] records
     * @param oldRecords Map of old [ObjectName] records
     */
    public static void handleBeforeUpdate(List<[ObjectName]> newRecords, Map<Id, [ObjectName]> oldRecords) {
        [ObjectName]Domain.validateAndPrepareForUpdate(newRecords);
    }
    
    /**
     * Handles after insert events
     * @param newRecords List of new [ObjectName] records
     */
    public static void handleAfterInsert(List<[ObjectName]> newRecords) {
        // Post-insert processing
        // Delegate to Service layer for complex workflows
    }
    
    /**
     * Handles after update events
     * @param newRecords List of updated [ObjectName] records
     * @param oldRecords Map of old [ObjectName] records
     */
    public static void handleAfterUpdate(List<[ObjectName]> newRecords, Map<Id, [ObjectName]> oldRecords) {
        // Post-update processing
        // Delegate to Service layer for complex workflows
    }
}

Trigger Template:

trigger [ObjectName]Trigger on [ObjectName] (before insert, before update, after insert, after update) {
    if (Trigger.isBefore) {
        if (Trigger.isInsert) {
            [ObjectName]TriggerHandler.handleBeforeInsert(Trigger.new);
        } else if (Trigger.isUpdate) {
            [ObjectName]TriggerHandler.handleBeforeUpdate(Trigger.new, Trigger.oldMap);
        }
    } else if (Trigger.isAfter) {
        if (Trigger.isInsert) {
            [ObjectName]TriggerHandler.handleAfterInsert(Trigger.new);
        } else if (Trigger.isUpdate) {
            [ObjectName]TriggerHandler.handleAfterUpdate(Trigger.new, Trigger.oldMap);
        }
    }
}

Customization Points:

• Replace [ObjectName] with actual object name (e.g., Contact)
• Add specific trigger events as needed (before delete, after delete, after undelete)
• Add recursion prevention if needed
• Add field change detection logic
• Delegate to Service layer for complex workflows

Related Patterns:

• Order of Execution