Support Duration in generated meta-data

Update the configuration properties annotation processor to deal
with `Duration` based default values. For example a field that
defaults to `Duration.ofSeconds(10)` will have a meta-data default
value of `10s`.

See gh-11080

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessor.java

@@ -19,6 +19,7 @@ package org.springframework.boot.configurationprocessor;
 import java.io.FileNotFoundException;
 import java.io.PrintWriter;
 import java.io.StringWriter;
+import java.time.Duration;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashSet;
@@ -424,8 +425,8 @@ public class ConfigurationMetadataAnnotationProcessor extends AbstractProcessor
 				String.format("Enable the %s endpoint.", endpointId),
 				(enabledByDefault == null ? true : enabledByDefault), null));
 		this.metadataCollector.add(ItemMetadata.newProperty(endpointKey(endpointId),
-				"cache.time-to-live", Long.class.getName(), type, null,
-				"Maximum time in milliseconds that a response can be cached.", 0, null));
+				"cache.time-to-live", Duration.class.getName(), type, null,
+				"Maximum time that a response can be cached.", 0, null));
 	}
 
 	private String endpointKey(String suffix) {

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/fieldvalues/javac/JavaCompilerFieldValuesParser.java

@@ -76,7 +76,7 @@ public class JavaCompilerFieldValuesParser implements FieldValuesParser {
 			WRAPPER_TYPES = Collections.unmodifiableMap(types);
 		}
 
-		private static final Map<Class<?>, Object> defaultTypeValues;
+		private static final Map<Class<?>, Object> DEFAULT_TYPE_VALUES;
 
 		static {
 			Map<Class<?>, Object> values = new HashMap<>();
@@ -85,10 +85,10 @@ public class JavaCompilerFieldValuesParser implements FieldValuesParser {
 			values.put(Short.class, (short) 0);
 			values.put(Integer.class, 0);
 			values.put(Long.class, (long) 0);
-			defaultTypeValues = Collections.unmodifiableMap(values);
+			DEFAULT_TYPE_VALUES = Collections.unmodifiableMap(values);
 		}
 
-		private static final Map<String, Object> wellKnownStaticFinals;
+		private static final Map<String, Object> WELL_KNOWN_STATIC_FINALS;
 
 		static {
 			Map<String, Object> values = new HashMap<>();
@@ -98,7 +98,22 @@ public class JavaCompilerFieldValuesParser implements FieldValuesParser {
 			values.put("StandardCharsets.UTF_8", "UTF-8");
 			values.put("StandardCharsets.UTF_16", "UTF-16");
 			values.put("StandardCharsets.US_ASCII", "US-ASCII");
-			wellKnownStaticFinals = Collections.unmodifiableMap(values);
+			WELL_KNOWN_STATIC_FINALS = Collections.unmodifiableMap(values);
+		}
+
+		private static final String DURATION_OF = "Duration.of";
+
+		private static final Map<String, String> DURATION_SUFFIX;
+
+		static {
+			Map<String, String> values = new HashMap<>();
+			values.put("Nanos", "ns");
+			values.put("Millis", "ms");
+			values.put("Seconds", "s");
+			values.put("Minutes", "m");
+			values.put("Hours", "h");
+			values.put("Days", "d");
+			DURATION_SUFFIX = Collections.unmodifiableMap(values);
 		}
 
 		private final Map<String, Object> fieldValues = new HashMap<>();
@@ -119,7 +134,7 @@ public class JavaCompilerFieldValuesParser implements FieldValuesParser {
 		private Object getValue(VariableTree variable) throws Exception {
 			ExpressionTree initializer = variable.getInitializer();
 			Class<?> wrapperType = WRAPPER_TYPES.get(variable.getType());
-			Object defaultValue = defaultTypeValues.get(wrapperType);
+			Object defaultValue = DEFAULT_TYPE_VALUES.get(wrapperType);
 			if (initializer != null) {
 				return getValue(initializer, defaultValue);
 			}
@@ -134,7 +149,7 @@ public class JavaCompilerFieldValuesParser implements FieldValuesParser {
 			}
 			Object factoryValue = expression.getFactoryValue();
 			if (factoryValue != null) {
-				return factoryValue;
+				return getFactoryValue(expression, factoryValue);
 			}
 			List<? extends ExpressionTree> arrayValues = expression.getArrayExpression();
 			if (arrayValues != null) {
@@ -152,11 +167,22 @@ public class JavaCompilerFieldValuesParser implements FieldValuesParser {
 				return this.staticFinals.get(expression.toString());
 			}
 			if (expression.getKind().equals("MEMBER_SELECT")) {
-				return wellKnownStaticFinals.get(expression.toString());
+				return WELL_KNOWN_STATIC_FINALS.get(expression.toString());
 			}
 			return defaultValue;
 		}
 
+		private Object getFactoryValue(ExpressionTree expression, Object factoryValue) {
+			Object instance = expression.getInstance();
+			if (instance != null && instance.toString().startsWith(DURATION_OF)) {
+				String type = instance.toString();
+				type = type.substring(DURATION_OF.length(), type.indexOf("("));
+				String suffix = DURATION_SUFFIX.get(type);
+				return (suffix == null ? null : factoryValue + suffix);
+			}
+			return factoryValue;
+		}
+
 		public Map<String, Object> getFieldValues() {
 			return this.fieldValues;
 		}

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessorTests.java

@@ -19,6 +19,7 @@ package org.springframework.boot.configurationprocessor;
 import java.io.File;
 import java.io.FileWriter;
 import java.io.IOException;
+import java.time.Duration;
 import java.util.Arrays;
 import java.util.Collections;
 
@@ -532,8 +533,8 @@ public class ConfigurationMetadataAnnotationProcessorTests {
 	@Test
 	public void simpleEndpoint() throws IOException {
 		ConfigurationMetadata metadata = compile(SimpleEndpoint.class);
-		assertThat(metadata).has(
-				Metadata.withGroup("management.endpoint.simple").fromSource(SimpleEndpoint.class));
+		assertThat(metadata).has(Metadata.withGroup("management.endpoint.simple")
+				.fromSource(SimpleEndpoint.class));
 		assertThat(metadata).has(enabledFlag("simple", true));
 		assertThat(metadata).has(cacheTtl("simple"));
 		assertThat(metadata.getItems()).hasSize(3);
@@ -564,9 +565,9 @@ public class ConfigurationMetadataAnnotationProcessorTests {
 		ConfigurationMetadata metadata = compile(CustomPropertiesEndpoint.class);
 		assertThat(metadata).has(Metadata.withGroup("management.endpoint.customprops")
 				.fromSource(CustomPropertiesEndpoint.class));
-		assertThat(metadata).has(Metadata
-				.withProperty("management.endpoint.customprops.name")
-				.ofType(String.class).withDefaultValue("test"));
+		assertThat(metadata)
+				.has(Metadata.withProperty("management.endpoint.customprops.name")
+						.ofType(String.class).withDefaultValue("test"));
 		assertThat(metadata).has(enabledFlag("customprops", true));
 		assertThat(metadata).has(cacheTtl("customprops"));
 		assertThat(metadata.getItems()).hasSize(4);
@@ -632,8 +633,8 @@ public class ConfigurationMetadataAnnotationProcessorTests {
 	private Metadata.MetadataItemCondition cacheTtl(String endpointId) {
 		return Metadata
 				.withProperty("management.endpoint." + endpointId + ".cache.time-to-live")
-				.ofType(Long.class).withDefaultValue(0).withDescription(
-						"Maximum time in milliseconds that a response can be cached.");
+				.ofType(Duration.class).withDefaultValue(0)
+				.withDescription("Maximum time that a response can be cached.");
 	}
 
 	@Test

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/fieldvalues/AbstractFieldValuesProcessorTests.java

@@ -88,6 +88,13 @@ public abstract class AbstractFieldValuesProcessorTests {
 				.isEqualTo(new Object[] { "c" });
 		assertThat(values.get("integerArray")).isEqualTo(new Object[] { 42, 24 });
 		assertThat(values.get("unknownArray")).isNull();
+		assertThat(values.get("durationNone")).isNull();
+		assertThat(values.get("durationNanos")).isEqualTo("5ns");
+		assertThat(values.get("durationMillis")).isEqualTo("10ms");
+		assertThat(values.get("durationSeconds")).isEqualTo("20s");
+		assertThat(values.get("durationMinutes")).isEqualTo("30m");
+		assertThat(values.get("durationHours")).isEqualTo("40h");
+		assertThat(values.get("durationDays")).isEqualTo("50d");
 	}
 
 	@SupportedAnnotationTypes({

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationsample/fieldvalues/FieldValues.java

@@ -18,6 +18,7 @@ package org.springframework.boot.configurationsample.fieldvalues;
 
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
+import java.time.Duration;
 
 import org.springframework.boot.configurationsample.ConfigurationProperties;
 import org.springframework.util.MimeType;
@@ -108,4 +109,18 @@ public class FieldValues {
 
 	private FieldValues[] unknownArray = new FieldValues[] { new FieldValues() };
 
+	private Duration durationNone;
+
+	private Duration durationNanos = Duration.ofNanos(5);
+
+	private Duration durationMillis = Duration.ofMillis(10);
+
+	private Duration durationSeconds = Duration.ofSeconds(20);
+
+	private Duration durationMinutes = Duration.ofMinutes(30);
+
+	private Duration durationHours = Duration.ofHours(40);
+
+	private Duration durationDays = Duration.ofDays(50);
+
 }