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#948: `IRechnung.kt`

projectforge-business/src/main/kotlin/org/projectforge/business/fibu/IRechnung.kt Type: Interface · Purpose: Abstract contract for invoice-like objects used by RechnungCalculator · Source: projectforge-business/src/main/kotlin/org/projectforge/business/fibu/IRechnung.kt 35 lines · 7 code · 25 comments · 3 blank

Core interface needed by RechnungCalculator for polymorphic invoice calculations. Provides a unified API over outgoing invoices (RechnungDO) and incoming invoices (EingangsrechnungDO), exposing payment amount, positions, and currency.

Interface Design

Property	Type	Description
`zahlBetrag`	`BigDecimal?`	Total payment amount (nullable)
`positionen`	`List?`	List of invoice positions
`currency`	`String?`	ISO currency code (e.g. "EUR", "USD")

Implementors

AbstractRechnungDO — base class for both incoming and outgoing invoices
RechnungDO — outgoing invoices to customers
EingangsrechnungDO — incoming invoices from vendors

Design Rationale

Introduced together with IRechnungsPosition to decouple the RechnungCalculator from concrete entity types. This allows the same calculation logic (net/gross sums, VAT, currency conversion) to operate on any invoice-like DTO without JPA entity dependencies. The currency field was added later to support multi-currency invoice processing.

Architecture Analysis

Resides in projectforge-business, the core module containing domain logic, services, and persistence. Defines a contract/interface that multiple implementations can satisfy, enabling polymorphic behavior and testability.

Git History