createProviderInstance method

@override ProviderSource createProviderInstance(ProviderAst resolvedProvider, CompileDirectiveMetadata? directiveMetadata, List<ProviderSource> providerSources, int uniqueId,)

Creates an eager instance for a provider and returns reference to source.

Implementation

@override
ProviderSource createProviderInstance(
  ProviderAst resolvedProvider,
  CompileDirectiveMetadata? directiveMetadata,
  List<ProviderSource> providerSources,
  int uniqueId,
) {
  // Create a new field property for this provider.
  final propName = '_${resolvedProvider.token.name}_${nodeIndex}_$uniqueId';
  final providerValueExpressions = providerSources
      .map((s) => s.build())
      .whereType<o.Expression>()
      .toList();

  o.Expression? changeDetectorRefExpr;

  if (resolvedProvider.providerType == ProviderAstType.Component) {
    if (directiveMetadata?.changeDetection ==
        ChangeDetectionStrategy.OnPush) {
      changeDetectorRefExpr = componentView;
    }
  }

  final providerExpr = view!.createProvider(
    propName,
    directiveMetadata,
    resolvedProvider,
    providerValueExpressions,
    resolvedProvider.multiProvider,
    resolvedProvider.eager,
    this,
  );

  /// Accumulate directive instances on this element for later use.
  if (resolvedProvider.providerType == ProviderAstType.Directive) {
    _directiveInstances.add(providerExpr);
  }

  return ExpressionProviderSource(
    resolvedProvider.token,
    providerExpr,
    changeDetectorRef: changeDetectorRefExpr,
  );
}