### File

`src/lib/mixins/extract-options-data-source.mixin.ts`

### Index

###### Properties
Protected Optional dataSource Protected Readonly dataSourceLoader Protected Readonly injector Protected Optional metadata Protected Optional settings Protected Optional useDataSourceValue Protected Optional viewer
###### Methods
Protected extractOptionsDatasource

### Properties

Protected Optional dataSource
Type : `BaseDataSource<ControlOptions | Record>`
Defined in src/lib/mixins/extract-options-data-source.mixin.ts:70

Protected Readonly dataSourceLoader
Type : `DataSourceLoader`
Defined in src/lib/mixins/extract-options-data-source.mixin.ts:64

Protected Readonly injector
Type : `Injector`
Defined in src/lib/mixins/extract-options-data-source.mixin.ts:72

Protected Optional metadata
Type : `BaseDataSourceMetadata`
Defined in src/lib/mixins/extract-options-data-source.mixin.ts:66

Protected Optional settings
Type : `UseOptionsDataSourceSettings<any>`
Defined in src/lib/mixins/extract-options-data-source.mixin.ts:62

Protected Optional useDataSourceValue
Type : `UseDataSourceValue<ControlOptions | Record>`
Defined in src/lib/mixins/extract-options-data-source.mixin.ts:74

Protected Optional viewer
Type : `BaseDataSourceViewer`
Defined in src/lib/mixins/extract-options-data-source.mixin.ts:68

### Methods

Protected extractOptionsDatasource
`extractOptionsDatasource(control?: AbstractControl)`
Defined in src/lib/mixins/extract-options-data-source.mixin.ts:76
Parameters :
Name | Type | Optional
control | `AbstractControl` | Yes
Returns : `BaseDataSource<ControlOptions | Record>`

    import {
      Injector,
      isDevMode,
    } from '@angular/core';
    import { AbstractControl } from '@angular/forms';
    import {
      BaseDataSource,
      BaseDataSourceMetadata,
      BaseDataSourceViewer,
      DataSourceLoader,
      PipeDataSource,
    } from '@rxap/data-source';
    import { IdOrInstanceOrToken } from '@rxap/definition';
    import { RxapFormControl } from '@rxap/forms';
    import { Mixin } from '@rxap/mixin';
    import { ControlOptions } from '@rxap/utilities';
    import {
      map,
      tap,
    } from 'rxjs/operators';
    import {
      UseDataSource,
      UseDataSourceSettings,
      UseDataSourceValue,
    } from '../decorators/use-data-source';
    import { InputSelectOptionsSettings } from '../directives/input-select-options.directive';
    import { ExtractControlMixin } from './extract-control.mixin';
    import { ExtractDataSourcesMixin } from './extract-data-sources.mixin';
    import { ExtractFormDefinitionMixin } from './extract-form-definition.mixin';

    export type UseOptionsDataSourceSettings<Source> = UseDataSourceSettings<Source, ControlOptions | Record<string, any>>

    export const DATA_SOURCE_NAME = 'options';

    export function ComposeOptionsTransformers(...fnc: Array<(value: any) => any>): (value: any) => any {
      return base => fnc.reduce((source, transform) => transform(source), base);
    }

    export function UseOptionsDataSource<Source>(
      dataSource: IdOrInstanceOrToken<BaseDataSource<Source>>,
      settings?: InputSelectOptionsSettings<Source>,
    ): (
      target: any,
      propertyKey: string,
    ) => any;
    export function UseOptionsDataSource(
      dataSource: IdOrInstanceOrToken<BaseDataSource>,
      settings?: InputSelectOptionsSettings<ControlOptions>,
    ) {
      return function (target: any, propertyKey: string) {
        UseDataSource(dataSource, DATA_SOURCE_NAME, settings)(target, propertyKey);
      };
    }

    export interface ExtractOptionsDataSourceMixin extends ExtractFormDefinitionMixin, ExtractDataSourcesMixin,
                                                           ExtractControlMixin {
    }

    @Mixin(ExtractControlMixin, ExtractFormDefinitionMixin, ExtractDataSourcesMixin)
    export class ExtractOptionsDataSourceMixin {

      protected settings?: UseOptionsDataSourceSettings<any>;

      protected readonly dataSourceLoader!: DataSourceLoader;

      protected metadata?: BaseDataSourceMetadata;

      protected viewer?: BaseDataSourceViewer;

      protected dataSource?: BaseDataSource<ControlOptions | Record<string, any>>;

      protected readonly injector!: Injector;

      protected useDataSourceValue?: UseDataSourceValue<ControlOptions | Record<string, any>>;

      protected extractOptionsDatasource(control?: AbstractControl): BaseDataSource<ControlOptions | Record<string, any>> {
        control ??= this.extractControl();

        if (!(control instanceof RxapFormControl)) {
          throw new Error('Ensure to use a RxapFromControl');
        }

        const formDefinition = this.extractFormDefinition(control);

        const useDataSourceValueMap = this.extractDataSources(formDefinition, control.controlId);

        if (!useDataSourceValueMap.has('options')) {
          throw new Error(`The data source with the name 'options' is not defined`);
        }

        const useDataSourceValue = this.useDataSourceValue = useDataSourceValueMap.get('options')!;

        this.settings = this.useDataSourceValue.settings ?? {};

        let dataSource: BaseDataSource;

        try {

          dataSource = this.dataSourceLoader.load(
            useDataSourceValue.dataSource,
            this.metadata,
            this.injector,
          );

        } catch (e: any) {

          if (e.name && e.name === 'NullInjectorError') {
            if (isDevMode()) {
              console.error('Cloud not inject the options data source', this.useDataSourceValue);
            }
            throw new Error('Cloud not inject the options data source:\n' + e.message);
          }

          throw e;

        }

        if (this.settings?.transformer) {
          dataSource = new PipeDataSource(
            dataSource,
            map(this.settings.transformer),
            tap(options => useDataSourceValue.lastValue = options),
          );
        } else {
          dataSource = new PipeDataSource(
            dataSource,
            tap(options => useDataSourceValue.lastValue = options),
          );
        }

        return this.dataSource = dataSource;
      }

    }

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