public S build()

in commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/CompositeSamplers.java [399:426]

• 22 lines of code
• 4 McCabe index (conditional complexity)

        public S build(UniformRandomProvider rng) {
            final List<WeightedSampler<S>> list = this.weightedSamplers;
            final int n = list.size();
            if (n == 0) {
                throw new IllegalStateException("No samplers to build the composite");
            }
            if (n == 1) {
                // No composite
                final S sampler = list.get(0).sampler;
                reset();
                return sampler;
            }

            // Extract the weights and samplers.
            final double[] weights = new double[n];
            final ArrayList<S> samplers = new ArrayList<>(n);
            for (int i = 0; i < n; i++) {
                final WeightedSampler<S> weightedItem = list.get(i);
                weights[i] = weightedItem.getWeight();
                samplers.add(weightedItem.getSampler());
            }

            reset();

            final DiscreteSampler discreteSampler = createDiscreteSampler(rng, weights);

            return compositeFactory.createSampler(discreteSampler, samplers);
        }