var jsonLightPayloadInfo = function()

in JSLib/src/odata-json-light.js [1032:1132]
73 lines of code
21 McCabe index (conditional complexity)

    var jsonLightPayloadInfo = function (data, model, inferFeedAsComplexType) {
        /// <summary>Infers the information describing the JSON light payload from its metadata annotation, structure, and data model.</summary>
        /// <param name="data" type="Object">Json light response payload object.</param>
        /// <param name="model" type="Object">Object describing an OData conceptual schema.</param>
        /// <param name="inferFeedAsComplexType" type="Boolean">True if a JSON light payload that looks like a feed should be treated as a complex type property instead.</param>
        /// <remarks>
        ///     If the arguments passed to the function don't convey enough information about the payload to determine without doubt that the payload is a feed then it
        ///     will try to use the payload object structure instead.  If the payload looks like a feed (has value property that is an array or non-primitive values) then
        ///     the function will report its kind as PAYLOADTYPE_FEED unless the inferFeedAsComplexType flag is set to true. This flag comes from the user request
        ///     and allows the user to control how the library behaves with an ambigous JSON light payload.
        /// </remarks>
        /// <returns type="Object">
        ///     Object with kind and type fields. Null if there is no metadata annotation or the payload info cannot be obtained..
        /// </returns>

        var metadataUri = data[metadataAnnotation];
        if (!metadataUri || typeof metadataUri !== "string") {
            return null;
        }

        var fragmentStart = metadataUri.lastIndexOf("#");
        if (fragmentStart === -1) {
            return jsonLightMakePayloadInfo(PAYLOADTYPE_SVCDOC);
        }

        var elementStart = metadataUri.indexOf("@Element", fragmentStart);
        var fragmentEnd = elementStart - 1;

        if (fragmentEnd < 0) {
            fragmentEnd = metadataUri.indexOf("?", fragmentStart);
            if (fragmentEnd === -1) {
                fragmentEnd = metadataUri.length;
            }
        }

        var fragment = decodeURIComponent(metadataUri.substring(fragmentStart + 1, fragmentEnd));
        if (fragment.indexOf("/$links/") > 0) {
            return jsonLightMakePayloadInfo(PAYLOADTYPE_LINKS);
        }

        var fragmentParts = fragment.split("/");
        if (fragmentParts.length >= 0) {
            var qualifiedName = fragmentParts[0];
            var typeCast = fragmentParts[1];

            if (jsonLightIsPrimitiveType(qualifiedName)) {
                return jsonLightMakePayloadInfo(PAYLOADTYPE_PRIMITIVE, qualifiedName);
            }

            if (isCollectionType(qualifiedName)) {
                return jsonLightMakePayloadInfo(PAYLOADTYPE_COLLECTION, qualifiedName);
            }

            var entityType = typeCast;
            var entitySet, functionImport, containerName;
            if (!typeCast) {
                var nsEnd = qualifiedName.lastIndexOf(".");
                var simpleName = qualifiedName.substring(nsEnd + 1);
                var container = (simpleName === qualifiedName) ?
                    lookupDefaultEntityContainer(model) :
                    lookupEntityContainer(qualifiedName.substring(0, nsEnd), model);

                if (container) {
                    entitySet = lookupEntitySet(container.entitySet, simpleName);
                    functionImport = container.functionImport;
                    containerName = container.name;
                    entityType = !!entitySet ? entitySet.entityType : null;
                }
            }

            var info;
            if (elementStart > 0) {
                info = jsonLightMakePayloadInfo(PAYLOADTYPE_OBJECT, entityType);
                info.entitySet = entitySet;
                info.functionImport = functionImport;
                info.containerName = containerName;
                return info;
            }

            if (entityType) {
                info = jsonLightMakePayloadInfo(PAYLOADTYPE_FEED, entityType);
                info.entitySet = entitySet;
                info.functionImport = functionImport;
                info.containerName = containerName;
                return info;
            }

            if (isArray(data.value) && !lookupComplexType(qualifiedName, model)) {
                var item = data.value[0];
                if (!isPrimitive(item)) {
                    if (jsonLightIsEntry(item) || !inferFeedAsComplexType) {
                        return jsonLightMakePayloadInfo(PAYLOADTYPE_FEED, null);
                    }
                }
            }

            return jsonLightMakePayloadInfo(PAYLOADTYPE_OBJECT, qualifiedName);
        }

        return null;
    };