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MapFields.ts
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MapFields.ts
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import { GraphQLSchema } from 'graphql';
import { Request, FieldNodeMappers, ExecutionResult } from '@graphql-tools/utils';
import { Transform, DelegationContext, SubschemaConfig } from '@graphql-tools/delegate';
import { ObjectValueTransformerMap, ErrorsTransformer } from '../types';
import TransformCompositeFields from './TransformCompositeFields';
export default class MapFields implements Transform {
private readonly transformer: TransformCompositeFields;
constructor(
fieldNodeTransformerMap: FieldNodeMappers,
objectValueTransformerMap?: ObjectValueTransformerMap,
errorsTransformer?: ErrorsTransformer
) {
this.transformer = new TransformCompositeFields(
() => undefined,
(typeName, fieldName, fieldNode, fragments, transformationContext) => {
const typeTransformers = fieldNodeTransformerMap[typeName];
if (typeTransformers == null) {
return undefined;
}
const fieldNodeTransformer = typeTransformers[fieldName];
if (fieldNodeTransformer == null) {
return undefined;
}
return fieldNodeTransformer(fieldNode, fragments, transformationContext);
},
objectValueTransformerMap != null
? (data, transformationContext) => {
if (data == null) {
return data;
}
const typeName = data.__typename;
if (typeName == null) {
return data;
}
const transformer = objectValueTransformerMap[typeName];
if (transformer == null) {
return data;
}
return transformer(data, transformationContext);
}
: undefined,
errorsTransformer != null ? errorsTransformer : undefined
);
}
public transformSchema(
originalWrappingSchema: GraphQLSchema,
subschemaConfig?: SubschemaConfig,
transforms?: Array<Transform>,
transformedSchema?: GraphQLSchema
): GraphQLSchema {
return this.transformer.transformSchema(originalWrappingSchema, subschemaConfig, transforms, transformedSchema);
}
public transformRequest(
originalRequest: Request,
delegationContext: DelegationContext,
transformationContext: Record<string, any>
): Request {
return this.transformer.transformRequest(originalRequest, delegationContext, transformationContext);
}
public transformResult(
originalResult: ExecutionResult,
delegationContext: DelegationContext,
transformationContext: Record<string, any>
): ExecutionResult {
return this.transformer.transformResult(originalResult, delegationContext, transformationContext);
}
}