Decomposition and reconstruction step in Tabu search

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I'm looking for the step by step to coding the decomposition and reconstruction step in Tabu search heuristic in Java but I don't understand the bolded words.

What is this and how can I explain it in java coding

After partitioning initial solution to subsets of routes or subproblem. Each subset of route is processed by Tabu Search. The best routes found for every subproblem are simply merged together to form the next solution for decomposition and reconstruction step. After a loop of D&R the final route will be recorded.

The decomposition is based on the polar angle associated with the center of gravity of each route. Using these polar angles, the domain is partitioned into sectors that approximately contain the same number of routes. Note that the decomposition changes from one D&R to the next by choosing a different starting angle for creating sectors, thus allowing the CROSS exchange heuristic to exploit new pairs of routes.

Thank in advance

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