public P deserialize()

in gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/TraversalSerializersV2.java [330:381]
50 lines of code
20 McCabe index (conditional complexity)

        public P deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
            String predicate = null;
            Object value = null;

            while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
                if (jsonParser.getCurrentName().equals(GraphSONTokens.PREDICATE)) {
                    jsonParser.nextToken();
                    predicate = jsonParser.getText();
                } else if (jsonParser.getCurrentName().equals(GraphSONTokens.VALUE)) {
                    jsonParser.nextToken();
                    value = deserializationContext.readValue(jsonParser, Object.class);
                }
            }

            if (predicate.equals(GraphSONTokens.AND) || predicate.equals(GraphSONTokens.OR)) {
                return predicate.equals(GraphSONTokens.AND) ? new AndP((List<P>) value) : new OrP((List<P>) value);
            } else if (predicate.equals(GraphSONTokens.NOT) && value instanceof P) {
                return P.not((P<?>) value);
            } else {
                try {
                    if (value instanceof Collection) {
                        if (predicate.equals("between"))
                            return P.between(((List) value).get(0), ((List) value).get(1));
                        else if (predicate.equals("inside"))
                            return P.between(((List) value).get(0), ((List) value).get(1));
                        else if (predicate.equals("outside"))
                            return P.outside(((List) value).get(0), ((List) value).get(1));
                        else if (predicate.equals("within"))
                            return P.within((Collection) value);
                        else if (predicate.equals("without"))
                            return P.without((Collection) value);
                        else
                            return (P) P.class.getMethod(predicate, Collection.class).invoke(null, (Collection) value);
                    } else if (predicate.equals("typeOf")) {
                        if (value instanceof GType)
                            return P.typeOf((GType) value);
                        else if (value instanceof String)
                            return P.typeOf((String) value);
                        else
                            return P.typeOf((Class<?>) value);
                    } else {
                        try {
                            return (P) P.class.getMethod(predicate, Object.class).invoke(null, value);
                        } catch (final NoSuchMethodException e) {
                            return (P) P.class.getMethod(predicate, Object[].class).invoke(null, (Object) new Object[]{value});
                        }
                    }
                } catch (final Exception e) {
                    throw new IllegalStateException(e.getMessage(), e);
                }
            }
        }