pailingual-odata/src/utils.ts

TypeScript client for OData v4 services

import { Query } from "./query";
import { CollectionSource } from "./collectionSource";
import { SingleSource } from "./singleSource";
import { EdmEntityType, ApiMetadata } from "./metadata";
import { Executable } from "./executable";
import { Options } from "./options";

export function expandExpressionBuild(propertyName: string, expression: Function, apiMetadata: ApiMetadata, entityType: EdmEntityType, options: Options): string {
    let navPropMD = entityType.navProperties[propertyName];
    if (navPropMD == null)
        throw new Error("Expand support navigation properties only");
    const propType = navPropMD.type as EdmEntityType;
    const q = Query.create(apiMetadata, propType, options);
    let sourceFactory = () => navPropMD.collection
        ? new CollectionSource(propType, apiMetadata, q)
        : new SingleSource(propType, apiMetadata, q);

    let params = buildQueryParamsExpression(expression, sourceFactory, options, ";")
    if (params)
        return propertyName + "(" + params + ")";
    return propertyName
}

export function buildPathExpression(func: Function, metadata: EdmEntityType, apiMetadata: ApiMetadata) {
    var entity = new SingleSource(metadata, apiMetadata, Query.create(null as any, metadata, undefined));
    entity = func(entity);
    var path = entity.query.url(false);
    if (startsWith(path, "/"))
        return path.substr(1);
    return path;
}

export function buildQueryParamsExpression(func: Function, sourceFactory: () => CollectionSource | SingleSource, options: Options, separator = ",") {
    let entity = sourceFactory();
    entity = func(entity);
    return entity.query.buildParams(options, separator);
}

export function generateOperations(obj: any, queryAccessor: () => Query, apiMetadata: ApiMetadata, entityType: EdmEntityType | undefined, isCollection = false) {
    for (let ns in apiMetadata.namespaces) {
        for (let metadata of apiMetadata.namespaces[ns].operations) {
            if ((metadata.bindingTo == undefined && entityType == undefined) //unbounded
                ||(
                metadata.bindingTo
                && (metadata.bindingTo.collection || false) == isCollection
                && metadata.bindingTo.type == entityType)
            ) {
                Object.defineProperty(obj, metadata.name, {
                    get: () => {
                        return (...args: any[]) => {
                            let query = queryAccessor().operation(metadata, args);
                            if (metadata.returnType && metadata.returnType.collection)
                                return new CollectionSource(metadata.returnType.type as EdmEntityType, apiMetadata, query);
                            return new Executable(query);
                        }
                    }
                });
            }
        }
    }
}

export function startsWith(str: string, search: string, position: number = 0) {
    return str.indexOf(search, position) == position;
}
export function endsWith(subjectString: string, search: string, position?: number) {
    if (position === undefined || position > subjectString.length) {
        position = subjectString.length;
    }
    position -= search.length;
    var lastIndex = subjectString.indexOf(search, position);
    return lastIndex !== -1 && lastIndex === position;
}

export function _extends(ctor: Function, funcs?: Record<string, Function>) {
    if (funcs) {
        for (var name in funcs) {
            let base = ctor.prototype[name];
            let func = funcs[name];
            ctor.prototype[name] = function () {
                return func.apply(this, [base && base.bind(this)].concat(Array.from(arguments)));
            }
        }
    }
}