The book looks at the use of both pattern specifications and pattern implementations. In the case of Pattern Specifications, we look at a few approaches that leverage Java - but also include an appendix that points to other tools that provide similar capabilities. The case study included in the book uses Java, but the concepts (Core Values, PBE Practice, and the PBE Patterns and Guidelines) are applicable to other languages as well.
Our focus in the book is really about how to succeed in using patterns. The patterns you use in a project could be the GoF patterns, POSA, from other sources - OR - patterns that you recognize within your project or organization. We provide coverage of how to successfully identify opportunities for patterns, design patterns, create patterns, package patterns, and consume patterns. In addition, we discuss working with Domain Specific Languages and Patterns.