What design pattern is best suited for encapsulating report generation logic for various formats like PDF and Excel?

The Strategy or Abstract Factory design pattern is particularly effective for encapsulating report generation logic for various formats like PDF and Excel because it allows for the definition of a family of algorithms, encapsulating each one, and making them interchangeable. Specifically:

1. Encapsulation of Logic: By implementing the Strategy pattern, different report generation logic can be encapsulated into separate classes, each responsible for generating reports in a specific format (e.g., one for PDF and another for Excel). This makes it easy to extend the report generation capabilities by adding more formats without modifying the existing code.

2. Interchangeability: With the Strategy pattern, clients can choose which report generation strategy to use at runtime based on the user's needs or preferences. This flexibility is particularly valuable in scenarios where reports may need to be generated in different formats frequently.

3. Clear Separation of Concerns: The use of this pattern promotes a clear separation between the report generation algorithms and the code that uses them, thereby adhering to principles like the Single Responsibility Principle.

4. Abstract Factory Aspect: If the report generation needs take into account not just the format but also the specific requirements and styles associated with each format (such as different headers, footers, or databases),