Allow data unit to be specified on the constructor parameter

See gh-21746

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/DataSizeUnit.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -30,9 +30,10 @@ import org.springframework.util.unit.DataUnit;
  * {@link DataSize}.
  *
  * @author Stephane Nicoll
+ * @author Vladislav Kisel
  * @since 2.1.0
  */
-@Target(ElementType.FIELD)
+@Target({ ElementType.FIELD, ElementType.PARAMETER })
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
 public @interface DataSizeUnit {

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/DurationUnit.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -29,9 +29,10 @@ import java.time.temporal.ChronoUnit;
  * {@link Duration}.
  *
  * @author Phillip Webb
+ * @author Vladislav Kisel
  * @since 2.0.0
  */
-@Target(ElementType.FIELD)
+@Target({ ElementType.FIELD, ElementType.PARAMETER })
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
 public @interface DurationUnit {

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/PeriodUnit.java

@@ -30,9 +30,10 @@ import java.time.temporal.ChronoUnit;
  *
  * @author Eddú Meléndez
  * @author Edson Chávez
+ * @author Vladislav Kisel
  * @since 2.3.0
  */
-@Target(ElementType.FIELD)
+@Target({ ElementType.FIELD, ElementType.PARAMETER })
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
 public @interface PeriodUnit {

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

@@ -19,6 +19,8 @@ package org.springframework.boot.context.properties;
 import java.beans.PropertyEditorSupport;
 import java.io.File;
 import java.time.Duration;
+import java.time.Period;
+import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
@@ -54,6 +56,8 @@ import org.springframework.boot.context.properties.bind.DefaultValue;
 import org.springframework.boot.context.properties.bind.validation.BindValidationException;
 import org.springframework.boot.context.properties.source.ConfigurationPropertyName;
 import org.springframework.boot.convert.DataSizeUnit;
+import org.springframework.boot.convert.DurationUnit;
+import org.springframework.boot.convert.PeriodUnit;
 import org.springframework.boot.testsupport.system.CapturedOutput;
 import org.springframework.boot.testsupport.system.OutputCaptureExtension;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
@@ -107,6 +111,7 @@ import static org.mockito.Mockito.verify;
  * @author Phillip Webb
  * @author Stephane Nicoll
  * @author Madhura Bhave
+ * @author Vladislav Kisel
  */
 @ExtendWith(OutputCaptureExtension.class)
 class ConfigurationPropertiesTests {
@@ -129,6 +134,14 @@ class ConfigurationPropertiesTests {
 		assertThat(this.context.getBean(BasicProperties.class).name).isEqualTo("foo");
 	}
 
+	@Test
+	void testConverting() {
+		load(BasicConfiguration.class, "name=foo");
+		assertThat(this.context.getBeanNamesForType(BasicProperties.class)).hasSize(1);
+		assertThat(this.context.containsBean(BasicProperties.class.getName())).isTrue();
+		assertThat(this.context.getBean(BasicProperties.class).name).isEqualTo("foo");
+	}
+
 	@Test
 	void loadShouldBindNested() {
 		load(NestedConfiguration.class, "name=foo", "nested.name=bar");
@@ -762,6 +775,22 @@ class ConfigurationPropertiesTests {
 		assertThat(bean.getBar()).isEqualTo(5);
 	}
 
+	@Test
+	void loadWhenBindingToConstructorParametersWithConversionShouldBind() {
+		MutablePropertySources sources = this.context.getEnvironment().getPropertySources();
+		Map<String, Object> source = new HashMap<>();
+		source.put("test.size", "2");
+		source.put("test.duration", "5");
+		source.put("test.period", "6");
+		sources.addLast(new MapPropertySource("test", source));
+		load(ConstructorParameterWithConversionConfiguration.class);
+		ConstructorParameterWithConversionProperties bean = this.context
+				.getBean(ConstructorParameterWithConversionProperties.class);
+		assertThat(bean.getSize()).isEqualTo(DataSize.ofMegabytes(2));
+		assertThat(bean.getDuration()).isEqualTo(Duration.ofDays(5));
+		assertThat(bean.getPeriod()).isEqualTo(Period.ofYears(6));
+	}
+
 	@Test // gh-17831
 	void loadWhenBindingConstructorParametersViaImportShouldThrowException() {
 		assertThatExceptionOfType(BeanCreationException.class)
@@ -777,6 +806,16 @@ class ConfigurationPropertiesTests {
 		assertThat(bean.getBar()).isEqualTo(0);
 	}
 
+	@Test
+	void loadWhenBindingToConstructorParametersWithConversionAndDefaultValuesShouldBind() {
+		load(ConstructorParameterWithConversionConfiguration.class);
+		ConstructorParameterWithConversionProperties bean = this.context
+				.getBean(ConstructorParameterWithConversionProperties.class);
+		assertThat(bean.getPeriod()).isEqualTo(Period.ofYears(4));
+		assertThat(bean.getSize()).isEqualTo(DataSize.ofMegabytes(3));
+		assertThat(bean.getDuration()).isEqualTo(Duration.ofDays(2));
+	}
+
 	@Test
 	void loadWhenBindingToConstructorParametersShouldValidate() {
 		assertThatExceptionOfType(Exception.class)
@@ -1933,6 +1972,39 @@ class ConfigurationPropertiesTests {
 
 	}
 
+	@ConstructorBinding
+	@ConfigurationProperties(prefix = "test")
+	@Validated
+	static class ConstructorParameterWithConversionProperties {
+
+		private final DataSize size;
+
+		private final Duration duration;
+
+		private final Period period;
+
+		ConstructorParameterWithConversionProperties(@DefaultValue("4") @PeriodUnit(ChronoUnit.YEARS) Period period,
+				@DefaultValue("3") @DataSizeUnit(DataUnit.MEGABYTES) DataSize size,
+				@DefaultValue("2") @DurationUnit(ChronoUnit.DAYS) Duration duration) {
+			this.size = size;
+			this.duration = duration;
+			this.period = period;
+		}
+
+		Period getPeriod() {
+			return this.period;
+		}
+
+		DataSize getSize() {
+			return this.size;
+		}
+
+		Duration getDuration() {
+			return this.duration;
+		}
+
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	@EnableConfigurationProperties
 	@Import(ConstructorParameterProperties.class)
@@ -1963,6 +2035,11 @@ class ConfigurationPropertiesTests {
 
 	}
 
+	@EnableConfigurationProperties(ConstructorParameterWithConversionProperties.class)
+	static class ConstructorParameterWithConversionConfiguration {
+
+	}
+
 	@EnableConfigurationProperties(ConstructorParameterValidatedProperties.class)
 	static class ConstructorParameterValidationConfiguration {