graphql-to-sparql/lib/handler/valuenode/NodeValueHandlerAdapter.d.ts

Converts GraphQL queries to SPARQL queries

import type * as RDF from '@rdfjs/types';
import type { Algebra } from '@traqula/algebra-transformations-1-2';
import type { ValueNode } from 'graphql';
import type { IConvertContext } from '../../IConvertContext';
import type { IConvertSettings } from '../../IConvertSettings';
import type { Util } from '../../Util';
/**
 * A handler for converting GraphQL value nodes to terms and patterns.
 */
export declare abstract class NodeValueHandlerAdapter<T extends ValueNode> {
    readonly targetKind: string;
    protected readonly util: Util;
    protected readonly settings: IConvertSettings;
    constructor(targetKind: T['kind'], util: Util, settings: IConvertSettings);
    /**
     * Get the terms and patterns for the given value node.
     * @param {T} valueNode A GraphQL node.
     * @param {string} fieldName The name of the field or argument in which the value was encapsulated.
     * @param {IConvertContext} convertContext A conversion context.
     * @return {IValueNodeHandlerOutput} The RDF terms and patterns.
     */
    abstract handle(valueNode: T, fieldName: string, convertContext: IConvertContext): IValueNodeHandlerOutput;
}
/**
 * The output of converting a value node to an RDF term.
 */
export interface IValueNodeHandlerOutput {
    /**
     * The resulting RDF terms.
     */
    terms: RDF.Term[];
    /**
     * An optional array of patterns that are dependencies of the resulting term(s).
     */
    auxiliaryPatterns?: Algebra.Pattern[];
}