Apex Studio Builder

/**
 * @description Service class for Account operations
 * @author ApexStudioBuilder
 */
public with sharing class AccountService {
    
    /**
     * @description Get accounts by industry with contacts
     * @param industry The industry to filter by
     * @return List of matching accounts with contacts
     */
    public List<Account> getByIndustry(String industry) {
        if (String.isBlank(industry)) {
            throw new IllegalArgumentException('Industry cannot be blank');
        }
        
        return [
            SELECT Id, Name, Industry, 
                   (SELECT Id, Name, Email FROM Contacts)
            FROM Account 
            WHERE Industry = :industry
            WITH SECURITY_ENFORCED
        ];
    }
}