DelimitedStringToCollectionConverterTests Class — spring-boot Architecture

Source Code

core/spring-boot/src/test/java/org/springframework/boot/convert/DelimitedStringToCollectionConverterTests.java lines 40–168

class DelimitedStringToCollectionConverterTests {

	@ConversionServiceTest
	void canConvertFromStringToCollectionShouldReturnTrue(ConversionService conversionService) {
		assertThat(conversionService.canConvert(String.class, Collection.class)).isTrue();
	}

	@ConversionServiceTest
	void matchesWhenTargetIsNotAnnotatedShouldReturnTrue(ConversionService conversionService) {
		TypeDescriptor sourceType = TypeDescriptor.valueOf(String.class);
		TypeDescriptor targetType = TypeDescriptor.nested(getField("noAnnotation"), 0);
		assertThat(targetType).isNotNull();
		assertThat(new DelimitedStringToCollectionConverter(conversionService).matches(sourceType, targetType))
			.isTrue();
	}

	@ConversionServiceTest
	void matchesWhenHasAnnotationAndNoElementTypeShouldReturnTrue(ConversionService conversionService) {
		TypeDescriptor sourceType = TypeDescriptor.valueOf(String.class);
		TypeDescriptor targetType = TypeDescriptor.nested(getField("noElementType"), 0);
		assertThat(targetType).isNotNull();
		assertThat(new DelimitedStringToCollectionConverter(conversionService).matches(sourceType, targetType))
			.isTrue();
	}

	@ConversionServiceTest
	void matchesWhenHasAnnotationAndNonConvertibleElementTypeShouldReturnFalse(ConversionService conversionService) {
		TypeDescriptor sourceType = TypeDescriptor.valueOf(String.class);
		TypeDescriptor targetType = TypeDescriptor.nested(getField("nonConvertibleElementType"), 0);
		assertThat(targetType).isNotNull();
		assertThat(new DelimitedStringToCollectionConverter(conversionService).matches(sourceType, targetType))
			.isFalse();
	}

	@ConversionServiceTest
	@SuppressWarnings("unchecked")
	void convertWhenHasNoElementTypeShouldReturnTrimmedString(ConversionService conversionService) {
		TypeDescriptor sourceType = TypeDescriptor.valueOf(String.class);
		TypeDescriptor targetType = TypeDescriptor.nested(getField("noElementType"), 0);
		assertThat(targetType).isNotNull();
		Collection<String> converted = (Collection<String>) conversionService.convert(" a |  b| c  ", sourceType,
				targetType);
		assertThat(converted).containsExactly("a", "b", "c");
	}

	@ConversionServiceTest
	@SuppressWarnings("unchecked")
	void convertWhenHasDelimiterOfNoneShouldReturnWholeString(ConversionService conversionService) {
		TypeDescriptor sourceType = TypeDescriptor.valueOf(String.class);
		TypeDescriptor targetType = TypeDescriptor.nested(getField("delimiterNone"), 0);
		assertThat(targetType).isNotNull();
		List<String> converted = (List<String>) conversionService.convert("a,b,c", sourceType, targetType);
		assertThat(converted).containsExactly("a,b,c");
	}

	@SuppressWarnings("unchecked")
	@ConversionServiceTest
	void convertWhenHasCollectionObjectTypeShouldUseCollectionObjectType(ConversionService conversionService) {
		TypeDescriptor sourceType = TypeDescriptor.valueOf(String.class);
		TypeDescriptor targetType = TypeDescriptor.nested(getField("specificType"), 0);
		assertThat(targetType).isNotNull();
		MyCustomList<String> converted = (MyCustomList<String>) conversionService.convert("a*b", sourceType,
				targetType);
		assertThat(converted).containsExactly("a", "b");
	}

	@Test
	void matchesWhenHasAnnotationAndConvertibleElementTypeShouldReturnTrue() {
		TypeDescriptor sourceType = TypeDescriptor.valueOf(String.class);
		TypeDescriptor targetType = TypeDescriptor.nested(getField("convertibleElementType"), 0);
		assertThat(targetType).isNotNull();
		assertThat(new DelimitedStringToCollectionConverter(new ApplicationConversionService()).matches(sourceType,
				targetType))
			.isTrue();
	}

	@Test
	@SuppressWarnings("unchecked")
	void convertWhenHasConvertibleElementTypeShouldReturnConvertedType() {
		TypeDescriptor sourceType = TypeDescriptor.valueOf(String.class);
		TypeDescriptor targetType = TypeDescriptor.nested(getField("convertibleElementType"), 0);
		assertThat(targetType).isNotNull();
		List<Integer> converted = (List<Integer>) new ApplicationConversionService().convert(" 1 |  2| 3  ", sourceType,
				targetType);
		assertThat(converted).containsExactly(1, 2, 3);
	}

	private Field getField(String fieldName) {
		Field field = ReflectionUtils.findField(Values.class, fieldName);
		assertThat(field).isNotNull();
		return field;
	}

	static Stream<? extends Arguments> conversionServices() {
		return ConversionServiceArguments
			.with((service) -> service.addConverter(new DelimitedStringToCollectionConverter(service)));
	}

	static class Values {

		@Nullable List<String> noAnnotation;

		@SuppressWarnings("rawtypes")
		@Delimiter("|")
		@Nullable List noElementType;

		@Delimiter("|")
		@Nullable List<Integer> convertibleElementType;

		@Delimiter("|")
		@Nullable List<NonConvertible> nonConvertibleElementType;

		@Delimiter(Delimiter.NONE)
		@Nullable List<String> delimiterNone;

		@Delimiter("*")
		@Nullable MyCustomList<String> specificType;

	}

	static class NonConvertible {

	}

	static class MyCustomList<E> extends LinkedList<E> {

	}

}