graphql.language.VariableReference Java Examples

private Type<?> type(Argument argument) {
    Value<?> value = argument.getValue();
    if (value instanceof VariableReference)
        return resolve(((VariableReference) value).getName());
    throw new GraphQlGeneratorException(
            "unsupported type " + value + " for argument '" + argument.getName() + "'");
}
 

public static Object parseLiteral(Object input, Map<String, Object> variables) throws CoercingParseLiteralException {
  if (!(input instanceof Value)) {
    log.error("Expected 'Value', got: {}", input);
    throw new CoercingParseLiteralException("Expected 'Value', got: " + input);
  }
  Object result = null;
  if (input instanceof StringValue) {
    result = ((StringValue) input).getValue();
  } else if (input instanceof IntValue) {
    result = ((IntValue) input).getValue();
  } else if (input instanceof FloatValue) {
    result = ((FloatValue) input).getValue();
  } else if (input instanceof BooleanValue) {
    result = ((BooleanValue) input).isValue();
  } else if (input instanceof EnumValue) {
    result = ((EnumValue) input).getName();
  } else if (input instanceof VariableReference) {
    result = variables.get(((VariableReference) input).getName());
  } else if (input instanceof ArrayValue) {
    result = ((ArrayValue) input).getValues().stream()
        .map(v -> parseLiteral(v, variables))
        .collect(toList());
  } else if (input instanceof ObjectValue) {
    result = ((ObjectValue) input).getObjectFields().stream()
        .collect(toMap(ObjectField::getName, f -> parseLiteral(f.getValue(), variables)));
  }
  return result;
}
 

private static JsonNode parseJsonValue(Value value, Map<String, Object> variables) {
    if (value instanceof BooleanValue) {
        return JsonNodeFactory.instance.booleanNode(((BooleanValue) value).isValue());
    }
    if (value instanceof EnumValue) {
        return JsonNodeFactory.instance.textNode(((EnumValue) value).getName());
    }
    if (value instanceof FloatValue) {
        return JsonNodeFactory.instance.numberNode(((FloatValue) value).getValue());
    }
    if (value instanceof IntValue) {
        return JsonNodeFactory.instance.numberNode(((IntValue) value).getValue());
    }
    if (value instanceof NullValue) {
        return JsonNodeFactory.instance.nullNode();
    }
    if (value instanceof StringValue) {
        return JsonNodeFactory.instance.textNode(((StringValue) value).getValue());
    }
    if (value instanceof ArrayValue) {
        List<Value> values = ((ArrayValue) value).getValues();
        ArrayNode jsonArray = JsonNodeFactory.instance.arrayNode(values.size());
        values.forEach(v -> jsonArray.add(parseJsonValue(v, variables)));
        return jsonArray;
    }
    if (value instanceof VariableReference) {
        return OBJECT_MAPPER.convertValue(variables.get(((VariableReference) value).getName()), JsonNode.class);
    }
    if (value instanceof ObjectValue) {
        final ObjectNode result = JsonNodeFactory.instance.objectNode();
        ((ObjectValue) value).getObjectFields().forEach(objectField ->
                result.set(objectField.getName(), parseJsonValue(objectField.getValue(), variables)));
        return result;
    }
    //Should never happen
    throw new CoercingParseLiteralException("Unknown scalar AST type: " + value.getClass().getName());
}
 

protected void addFieldFilterFromObjectField(String path, ObjectField filter, BoolQueryBuilder query,
                                             DataFetchingEnvironment env) {
    if (filter.getValue() instanceof ArrayValue) {
        ArrayValue actualFilters = (ArrayValue) filter.getValue();
        switch (filter.getName()) {
            case ARG_NAME_NOT:
                BoolQueryBuilder notQuery = boolQuery();
                actualFilters.getValues()
                    .forEach(notFilter -> ((ObjectValue) notFilter).getObjectFields()
                        .forEach(notField -> addFieldFilterFromObjectField(path, notField, notQuery, env)));
                notQuery.filter().forEach(query::mustNot);
                break;
            case ARG_NAME_AND:
                actualFilters.getValues()
                    .forEach(andFilter -> ((ObjectValue) andFilter).getObjectFields()
                        .forEach(andField -> addFieldFilterFromObjectField(path, andField, query, env)));
                break;
            case ARG_NAME_OR:
                BoolQueryBuilder tempQuery = boolQuery();
                BoolQueryBuilder orQuery = boolQuery();
                actualFilters.getValues().forEach(orFilter ->
                    ((ObjectValue) orFilter).getObjectFields()
                        .forEach(orField -> addFieldFilterFromObjectField(path, orField, tempQuery, env)));
                tempQuery.filter().forEach(orQuery::should);
                query.filter(boolQuery().must(orQuery));
                break;
            default:
                // never happens
        }
    } else if (!(filter.getValue() instanceof VariableReference) ||
                env.getVariables().containsKey(((VariableReference)filter.getValue()).getName())) {
        query.filter(getFilterQueryFromObjectField(path, filter, env));
    }
}
 

/**
 * Extracts a scalar value, this is needed because of GraphQL strict types
 */
protected Object getRealValue(Value value, DataFetchingEnvironment env) {
    if (value instanceof BooleanValue) {
        return ((BooleanValue)value).isValue();
    } else if (value instanceof FloatValue) {
        return ((FloatValue) value).getValue();
    } else if (value instanceof IntValue) {
        return ((IntValue) value).getValue();
    } else if (value instanceof StringValue) {
        return ((StringValue) value).getValue();
    } else if (value instanceof VariableReference) {
        return env.getVariables().get(((VariableReference) value).getName());
    }
    return null;
}
 

@Test
public void variableReferenceValue() {
  Value value = VariableReference.newVariableReference().name("a").build();
  Object result = JsonCoercingUtil.parseLiteral(value, Map.of("a", "b"));
  assertThat(result, is("b"));
}
 

/**
 * Adds the required filters to the ES query for the given field
 */
protected void processSelection(String path, Selection currentSelection, BoolQueryBuilder query,
                                List<String> queryFieldIncludes, DataFetchingEnvironment env)  {
    if (currentSelection instanceof Field) {
        // If the current selection is a field
        Field currentField = (Field) currentSelection;

        // Get the original field name
        String propertyName = getOriginalName(currentField.getName());
        // Build the ES-friendly path
        String fullPath = StringUtils.isEmpty(path)? propertyName : path + "." + propertyName;

        // If the field has sub selection
        if (Objects.nonNull(currentField.getSelectionSet())) {
            // If the field is a flattened component
            if (fullPath.matches(COMPONENT_INCLUDE_REGEX)) {
                // Include the 'content-type' field to make sure the type can be resolved during runtime
                String contentTypeFieldPath = fullPath + "." + QUERY_FIELD_NAME_CONTENT_TYPE;
                if (!queryFieldIncludes.contains(contentTypeFieldPath)) {
                    queryFieldIncludes.add(contentTypeFieldPath);
                }
            }

            // Process recursively and finish
            currentField.getSelectionSet().getSelections()
                .forEach(selection -> processSelection(fullPath, selection, query, queryFieldIncludes, env));
            return;
        }

        // Add the field to the list
        logger.debug("Adding selected field '{}' to query", fullPath);
        queryFieldIncludes.add(fullPath);

        // Check the filters to build the ES query
        Optional<Argument> arg =
            currentField.getArguments().stream().filter(a -> a.getName().equals(FILTER_NAME)).findFirst();
        if (arg.isPresent()) {
            logger.debug("Adding filters for field {}", fullPath);
            Value<?> argValue = arg.get().getValue();
            if (argValue instanceof ObjectValue) {
                List<ObjectField> filters = ((ObjectValue) argValue).getObjectFields();
                filters.forEach((filter) -> addFieldFilterFromObjectField(fullPath, filter, query, env));
            } else if (argValue instanceof VariableReference &&
                    env.getVariables().containsKey(((VariableReference) argValue).getName())) {
                Map<String, Object> map =
                        (Map<String, Object>) env.getVariables().get(((VariableReference) argValue).getName());
                map.entrySet().forEach(filter -> addFieldFilterFromMapEntry(fullPath, filter, query, env));
            }
        }
    } else if (currentSelection instanceof InlineFragment) {
        // If the current selection is an inline fragment, process recursively
        InlineFragment fragment = (InlineFragment) currentSelection;
        fragment.getSelectionSet().getSelections()
            .forEach(selection -> processSelection(path, selection, query, queryFieldIncludes, env));
    } else if (currentSelection instanceof FragmentSpread) {
        // If the current selection is a fragment spread, find the fragment and process recursively
        FragmentSpread fragmentSpread = (FragmentSpread) currentSelection;
        FragmentDefinition fragmentDefinition = env.getFragmentsByName().get(fragmentSpread.getName());
        fragmentDefinition.getSelectionSet().getSelections()
            .forEach(selection -> processSelection(path, selection, query, queryFieldIncludes, env));
    }
}