commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/ode/events/FilterType.java [154:200]:
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                        } else if (g < 0) {
                            // initialize as if previous root (i.e. forward one) was an ignored increasing event
                            return Transformer.MIN;
                        } else {
                            // we are exactly at a root, we don't know if it is an increasing
                            // or a decreasing event, we remain in uninitialized state
                            return Transformer.UNINITIALIZED;
                        }
                    case PLUS  :
                        if (g <= 0) {
                            // we have crossed the zero line on an ignored increasing event,
                            // we must change the transformer
                            return Transformer.MAX;
                        } else {
                            // we are still in the same status
                            return previous;
                        }
                    case MINUS :
                        if (g <= 0) {
                            // we have crossed the zero line on an ignored increasing event,
                            // we must change the transformer
                            return Transformer.MIN;
                        } else {
                            // we are still in the same status
                            return previous;
                        }
                    case MIN   :
                        if (g >= 0) {
                            // we have crossed the zero line on a triggered decreasing event,
                            // we must change the transformer
                            return Transformer.PLUS;
                        } else {
                            // we are still in the same status
                            return previous;
                        }
                    case MAX   :
                        if (g >= 0) {
                            // we have crossed the zero line on a triggered decreasing event,
                            // we must change the transformer
                            return Transformer.MINUS;
                        } else {
                            // we are still in the same status
                            return previous;
                        }
                    default    :
                        // this should never happen
                        throw new MathInternalError();
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commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/ode/events/FilterType.java [276:322]:
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                        } else if (g < 0) {
                            // initialize as if previous root (i.e. backward one) was an ignored decreasing event
                            return Transformer.MIN;
                        } else {
                            // we are exactly at a root, we don't know if it is an increasing
                            // or a decreasing event, we remain in uninitialized state
                            return Transformer.UNINITIALIZED;
                        }
                    case PLUS  :
                        if (g <= 0) {
                            // we have crossed the zero line on an ignored decreasing event,
                            // we must change the transformer
                            return Transformer.MAX;
                        } else {
                            // we are still in the same status
                            return previous;
                        }
                    case MINUS :
                        if (g <= 0) {
                            // we have crossed the zero line on an ignored decreasing event,
                            // we must change the transformer
                            return Transformer.MIN;
                        } else {
                            // we are still in the same status
                            return previous;
                        }
                    case MIN   :
                        if (g >= 0) {
                            // we have crossed the zero line on a triggered increasing event,
                            // we must change the transformer
                            return Transformer.PLUS;
                        } else {
                            // we are still in the same status
                            return previous;
                        }
                    case MAX   :
                        if (g >= 0) {
                            // we have crossed the zero line on a triggered increasing event,
                            // we must change the transformer
                            return Transformer.MINUS;
                        } else {
                            // we are still in the same status
                            return previous;
                        }
                    default    :
                        // this should never happen
                        throw new MathInternalError();
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