Merge branch '3.2.x'

Closes gh-39115

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConfigurationPropertiesCharSequenceToObjectConverter.java

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2012-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.context.properties;
+
+import java.util.Collections;
+import java.util.Set;
+
+import org.springframework.boot.convert.ApplicationConversionService;
+import org.springframework.core.convert.ConversionService;
+import org.springframework.core.convert.TypeDescriptor;
+import org.springframework.core.convert.converter.ConditionalGenericConverter;
+
+/**
+ * Copy of package-private
+ * {@code org.springframework.boot.convert.CharSequenceToObjectConverter}, renamed for
+ * differentiation.
+ *
+ * @author Phillip Webb
+ * @author Andy Wilkinson
+ */
+final class ConfigurationPropertiesCharSequenceToObjectConverter implements ConditionalGenericConverter {
+
+	private static final TypeDescriptor STRING = TypeDescriptor.valueOf(String.class);
+
+	private static final TypeDescriptor BYTE_ARRAY = TypeDescriptor.valueOf(byte[].class);
+
+	private static final Set<ConvertiblePair> TYPES;
+
+	private final ThreadLocal<Boolean> disable = new ThreadLocal<>();
+
+	static {
+		TYPES = Collections.singleton(new ConvertiblePair(CharSequence.class, Object.class));
+	}
+
+	private final ConversionService conversionService;
+
+	ConfigurationPropertiesCharSequenceToObjectConverter(ConversionService conversionService) {
+		this.conversionService = conversionService;
+	}
+
+	@Override
+	public Set<ConvertiblePair> getConvertibleTypes() {
+		return TYPES;
+	}
+
+	@Override
+	public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
+		if (sourceType.getType() == String.class || this.disable.get() == Boolean.TRUE) {
+			return false;
+		}
+		this.disable.set(Boolean.TRUE);
+		try {
+			boolean canDirectlyConvertCharSequence = this.conversionService.canConvert(sourceType, targetType);
+			if (canDirectlyConvertCharSequence && !isStringConversionBetter(sourceType, targetType)) {
+				return false;
+			}
+			return this.conversionService.canConvert(STRING, targetType);
+		}
+		finally {
+			this.disable.remove();
+		}
+	}
+
+	/**
+	 * Return if String based conversion is better based on the target type. This is
+	 * required when ObjectTo... conversion produces incorrect results.
+	 * @param sourceType the source type to test
+	 * @param targetType the target type to test
+	 * @return if string conversion is better
+	 */
+	private boolean isStringConversionBetter(TypeDescriptor sourceType, TypeDescriptor targetType) {
+		if (this.conversionService instanceof ApplicationConversionService applicationConversionService) {
+			if (applicationConversionService.isConvertViaObjectSourceType(sourceType, targetType)) {
+				// If an ObjectTo... converter is being used then there might be a
+				// better StringTo... version
+				return true;
+			}
+		}
+		if ((targetType.isArray() || targetType.isCollection()) && !targetType.equals(BYTE_ARRAY)) {
+			// StringToArrayConverter / StringToCollectionConverter are better than
+			// ObjectToArrayConverter / ObjectToCollectionConverter
+			return true;
+		}
+		return false;
+	}
+
+	@Override
+	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
+		return this.conversionService.convert(source.toString(), STRING, targetType);
+	}
+
+}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConversionServiceDeducer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -65,6 +65,8 @@ private List<ConversionService> getConversionServices(ConfigurableApplicationCon
 		if (!converterBeans.isEmpty()) {
 			FormattingConversionService beansConverterService = new FormattingConversionService();
 			DefaultConversionService.addCollectionConverters(beansConverterService);
+			beansConverterService
+				.addConverter(new ConfigurationPropertiesCharSequenceToObjectConverter(beansConverterService));
 			converterBeans.addTo(beansConverterService);
 			conversionServices.add(beansConverterService);
 		}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/ConfigurationPropertiesCharSequenceToObjectConverterTests.java

@@ -0,0 +1,116 @@
+/*
+ * Copyright 2012-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.context.properties;
+
+import java.util.List;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.provider.Arguments;
+
+import org.springframework.boot.convert.ApplicationConversionService;
+import org.springframework.boot.convert.ConversionServiceArguments;
+import org.springframework.boot.convert.ConversionServiceTest;
+import org.springframework.core.convert.ConversionService;
+import org.springframework.core.convert.TypeDescriptor;
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.format.support.DefaultFormattingConversionService;
+import org.springframework.format.support.FormattingConversionService;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ConfigurationPropertiesCharSequenceToObjectConverter}
+ *
+ * @author Phillip Webb
+ * @author Andy Wilkinson
+ */
+class ConfigurationPropertiesCharSequenceToObjectConverterTests {
+
+	@ConversionServiceTest
+	void convertWhenCanConvertViaToString(ConversionService conversionService) {
+		assertThat(conversionService.convert(new StringBuilder("1"), Integer.class)).isOne();
+	}
+
+	@ConversionServiceTest
+	void convertWhenCanConvertDirectlySkipsStringConversion(ConversionService conversionService) {
+		assertThat(conversionService.convert(new String("1"), Long.class)).isOne();
+		if (!ConversionServiceArguments.isApplicationConversionService(conversionService)) {
+			assertThat(conversionService.convert(new StringBuilder("1"), Long.class)).isEqualTo(2);
+		}
+	}
+
+	@Test
+	@SuppressWarnings("unchecked")
+	void convertWhenTargetIsList() {
+		ConversionService conversionService = new ApplicationConversionService();
+		StringBuilder source = new StringBuilder("1,2,3");
+		TypeDescriptor sourceType = TypeDescriptor.valueOf(StringBuilder.class);
+		TypeDescriptor targetType = TypeDescriptor.collection(List.class, TypeDescriptor.valueOf(String.class));
+		List<String> converted = (List<String>) conversionService.convert(source, sourceType, targetType);
+		assertThat(converted).containsExactly("1", "2", "3");
+	}
+
+	@Test
+	@SuppressWarnings("unchecked")
+	void convertWhenTargetIsListAndNotUsingApplicationConversionService() {
+		FormattingConversionService conversionService = new DefaultFormattingConversionService();
+		conversionService.addConverter(new ConfigurationPropertiesCharSequenceToObjectConverter(conversionService));
+		StringBuilder source = new StringBuilder("1,2,3");
+		TypeDescriptor sourceType = TypeDescriptor.valueOf(StringBuilder.class);
+		TypeDescriptor targetType = TypeDescriptor.collection(List.class, TypeDescriptor.valueOf(String.class));
+		List<String> converted = (List<String>) conversionService.convert(source, sourceType, targetType);
+		assertThat(converted).containsExactly("1", "2", "3");
+	}
+
+	static Stream<? extends Arguments> conversionServices() {
+		return ConversionServiceArguments.with((conversionService) -> {
+			conversionService.addConverter(new StringToIntegerConverter());
+			conversionService.addConverter(new StringToLongConverter());
+			conversionService.addConverter(new CharSequenceToLongConverter());
+			conversionService.addConverter(new ConfigurationPropertiesCharSequenceToObjectConverter(conversionService));
+		});
+	}
+
+	static class StringToIntegerConverter implements Converter<String, Integer> {
+
+		@Override
+		public Integer convert(String source) {
+			return Integer.valueOf(source);
+		}
+
+	}
+
+	static class StringToLongConverter implements Converter<String, Long> {
+
+		@Override
+		public Long convert(String source) {
+			return Long.valueOf(source);
+		}
+
+	}
+
+	static class CharSequenceToLongConverter implements Converter<CharSequence, Long> {
+
+		@Override
+		public Long convert(CharSequence source) {
+			return Long.valueOf(source.toString()) + 1;
+		}
+
+	}
+
+}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/ConfigurationPropertiesTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -83,6 +83,7 @@
 import org.springframework.core.convert.support.DefaultConversionService;
 import org.springframework.core.env.MapPropertySource;
 import org.springframework.core.env.MutablePropertySources;
+import org.springframework.core.env.PropertySource;
 import org.springframework.core.env.StandardEnvironment;
 import org.springframework.core.env.SystemEnvironmentPropertySource;
 import org.springframework.core.io.ClassPathResource;
@@ -653,6 +654,41 @@ void loadShouldUseConverterBean() {
 		assertThat(person.lastName).isEqualTo("Smith");
 	}
 
+	@Test
+	void loadShouldUseStringConverterBeanWhenValueIsCharSequence() {
+		this.context.register(PersonConverterConfiguration.class, PersonProperties.class);
+		PropertySource<?> testProperties = new MapPropertySource("test", Map.of("test.person", new CharSequence() {
+
+			private final String value = "John Smith";
+
+			@Override
+			public int length() {
+				return this.value.length();
+			}
+
+			@Override
+			public char charAt(int index) {
+				return this.value.charAt(index);
+			}
+
+			@Override
+			public CharSequence subSequence(int start, int end) {
+				return this.value.subSequence(start, end);
+			}
+
+			@Override
+			public String toString() {
+				return this.value;
+			}
+
+		}));
+		this.context.getEnvironment().getPropertySources().addLast(testProperties);
+		this.context.refresh();
+		Person person = this.context.getBean(PersonProperties.class).getPerson();
+		assertThat(person.firstName).isEqualTo("John");
+		assertThat(person.lastName).isEqualTo("Smith");
+	}
+
 	@Test
 	void loadWhenBeanFactoryConversionServiceAndConverterBeanCanUseBeanFactoryConverter() {
 		DefaultConversionService conversionService = new DefaultConversionService();

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/ConversionServiceDeducerTests.java

@@ -78,6 +78,7 @@ void getConversionServiceWhenHasQualifiedConverterBeansContainsCustomizedFormatt
 		assertThat(conversionServices).hasSize(2);
 		assertThat(conversionServices.get(0)).isExactlyInstanceOf(FormattingConversionService.class);
 		assertThat(conversionServices.get(0).canConvert(InputStream.class, OutputStream.class)).isTrue();
+		assertThat(conversionServices.get(0).canConvert(CharSequence.class, InputStream.class)).isTrue();
 		assertThat(conversionServices.get(1)).isSameAs(ApplicationConversionService.getSharedInstance());
 	}
 
@@ -105,6 +106,12 @@ TestConverter testConverter() {
 			return new TestConverter();
 		}
 
+		@Bean
+		@ConfigurationPropertiesBinding
+		StringConverter stringConverter() {
+			return new StringConverter();
+		}
+
 	}
 
 	private static final class TestApplicationConversionService extends ApplicationConversionService {
@@ -120,4 +127,13 @@ public OutputStream convert(InputStream source) {
 
 	}
 
+	private static final class StringConverter implements Converter<String, InputStream> {
+
+		@Override
+		public InputStream convert(String source) {
+			throw new UnsupportedOperationException();
+		}
+
+	}
+
 }

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/convert/ConversionServiceArguments.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,20 +35,20 @@
  * @author Phillip Webb
  * @author Andy Wilkinson
  */
-final class ConversionServiceArguments {
+public final class ConversionServiceArguments {
 
 	private ConversionServiceArguments() {
 	}
 
-	static Stream<? extends Arguments> with(Formatter<?> formatter) {
+	public static Stream<? extends Arguments> with(Formatter<?> formatter) {
 		return with((conversionService) -> conversionService.addFormatter(formatter));
 	}
 
-	static Stream<? extends Arguments> with(GenericConverter converter) {
+	public static Stream<? extends Arguments> with(GenericConverter converter) {
 		return with((conversionService) -> conversionService.addConverter(converter));
 	}
 
-	static Stream<? extends Arguments> with(Consumer<FormattingConversionService> initializer) {
+	public static Stream<? extends Arguments> with(Consumer<FormattingConversionService> initializer) {
 		FormattingConversionService withoutDefaults = new FormattingConversionService();
 		initializer.accept(withoutDefaults);
 		return Stream.of(
@@ -57,7 +57,7 @@ static Stream<? extends Arguments> with(Consumer<FormattingConversionService> in
 						"Application conversion service")));
 	}
 
-	static boolean isApplicationConversionService(ConversionService conversionService) {
+	public static boolean isApplicationConversionService(ConversionService conversionService) {
 		if (conversionService instanceof NamedConversionService namedConversionService) {
 			return isApplicationConversionService(namedConversionService.delegate);
 		}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/convert/ConversionServiceTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -39,6 +39,6 @@
 @MethodSource("conversionServices")
 @Target(ElementType.METHOD)
 @Retention(RetentionPolicy.RUNTIME)
-@interface ConversionServiceTest {
+public @interface ConversionServiceTest {
 
 }