Introducing the ConfigurationBuilder with support to Properties file

[oswaldobapvicjr]

New feature

Proposed solution

Introducing the new project setup with capabilities to handle local properties files from the classpath, according to the example:

Configuration config = Configuration.<Properties>builder()
                                .source(new ClasspathFileSource<>("my-props.properties"))
                                .mapper(new PropertiesMapper())
                                .build();

config.getBooleanProperty("web.enable"); // true
config.getStringProperty("web.host");    // "localhost"
config.getIntProperty("web.port");       // 1910

The following requirements shall be addressed in this issue:

• Add a new parent POM confectory-base
• Add a new module confectory-core
• New Source interface, with a concrete ClasspathFileSource implementation for local classpath resources
• New concrete Source implementation FileSource with built-in environment variable replacement
• New Mapper interface, with a concrete PropertiesMapper implementation for loading Properties files
• New Reader interface, with a concrete PropertiesReader implementation
• New Configuration and ConfigurationBuilder objects with capabilities to handle properties files
• Add logs using Log4j2

Additional details

• The code shall be developed in a dedicated branch, with the prefix issue/ followed by the issue number (e.g.: issue/0002)

Quality criteria

The following criteria will be observed during the Code Review:

Code coverage

• The produced code shall be secured by unit tests.
• Test coverage shall remain the same or increase.

Documentation

• All methods shall be documented with Javadoc, providing examples of usage.
• Javadoc pages shall be compilable with no errors or warnings
• README.md shall be updated if applicable