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messager.printMessage(Diagnostic.Kind.ERROR, message, element);

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String providerName = enclosing.getSimpleName().toString() + "Provider";
PackageElement pkg = elementUtils.getPackageOf(enclosing);
String packageName = pkg.isUnnamed() ? "" : pkg.getQualifiedName().toString();

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implementation 'com.squareup:javapoet:1.9.0'

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TypeSpec.Builder classBuilder = TypeSpec.classBuilder(providerName)
                                        .addModifiers(Modifier.PUBLIC, Modifier.FINAL);

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MethodSpec.Builder provideFuncBuilder = MethodSpec.methodBuilder("provide")
                                                  .addModifiers(Modifier.PUBLIC, Modifier.STATIC)
                                                  .addParameter(ClassName.get(enclosing.asType()),"dependant");

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provideFuncBuilder.addParameter(ClassName.get(field.asType()), fieldName);
provideFuncBuilder.addStatement("dependant.$L = $L", fieldName, fieldName);

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classBuilder.addMethod(provideFuncBuilder.build());

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JavaFile.builder(packageName, classBuilder.build()).build().writeTo(filer);

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annotationProcessor project(':processor')

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MainActivityProvider.provide(this, "John Smith");