public WorkflowGraphBuilder customTransition()

in flux/src/main/java/software/amazon/aws/clients/swf/flux/wf/graph/WorkflowGraphBuilder.java [310:345]
30 lines of code
13 McCabe index (conditional complexity)

    public WorkflowGraphBuilder customTransition(Class<? extends WorkflowStep> step, String resultCode,
                                                 Class<? extends WorkflowStep> nextStep) {
        if (!stepImpls.containsKey(step)) {
            throw new WorkflowGraphBuildException("Please add a step with addStep before defining transitions away from it.");
        }

        if (nextStep == null) {
            throw new WorkflowGraphBuildException("Cannot transition to a null step."
                                                  + " (Did you mean to transition to CloseWorkflow.class?)");
        } else if (nextStep == step) {
            throw new WorkflowGraphBuildException("Cannot transition a step to itself (the step should retry instead).");
        }

        if (resultCode == null || resultCode.equals("")) {
            throw new WorkflowGraphBuildException("Result codes must not be blank.");
        }

        if (PartitionedWorkflowStep.class.isAssignableFrom(step)
                && !StepResult.VALID_PARTITIONED_STEP_RESULT_CODES.contains(resultCode)) {
            throw new WorkflowGraphBuildException("Partitioned steps may not define custom result codes.");
        }

        if (!steps.containsKey(step)) {
            steps.put(step, new HashMap<>());
        } else if (steps.get(step).containsKey(resultCode)) {
            throw new WorkflowGraphBuildException("Multiple transitions cannot be defined for a single result code ("
                                                  + resultCode + ").");
        } else if (!steps.get(step).isEmpty() && (StepResult.ALWAYS_RESULT_CODE.equals(resultCode)
                                                  || steps.get(step).containsKey(StepResult.ALWAYS_RESULT_CODE))) {
            throw new WorkflowGraphBuildException("Cannot define 'always' and another transition for the same step.");
        }

        steps.get(step).put(resultCode, nextStep);

        return this;
    }