Visitor Pattern

Two simple examples are taken from github repo about Visitor pattern:


The Visitor drops by:

• The Visitor must visit each element of the Composite; that functionality is in a Traverser object.
• The Visitor is guided by the Traverser to gather state from all of the objects in the Composite.
• Once the state has been gathered, the Client can have the Visitor perform various operations on the state.
• When new functionality is required, only the Visitor must be enhanced.

From: Head First Design Patterns.

1. https://github.com/devwebcl/simple_design_patterns/tree/master/visitor-pattern/src/main/java/com/iluwatar/visitor

2.  https://github.com/devwebcl/simple_design_patterns/tree/master/visitor-pattern/src/main/java/com/behavioural/visitor

References:

1. https://github.com/chirey/designPatternsThoughtsCode
2. https://github.com/iluwatar/java-design-patterns/tree/master/visitor