Provide a property creation context to HalFormsOptionsFactory

Author: reda-alaoui

src/main/java/org/springframework/hateoas/AffordanceModel.java

@@ -147,13 +147,35 @@ public PayloadMetadata getOutput() {
 	 * @return will never be {@literal null}.
 	 * @since 1.3
 	 */
-	public <T> List<T> createProperties(BiFunction<InputPayloadMetadata, PropertyMetadata, T> creator) {
+	public <T> List<T> createProperties(PropertyCreator<T> creator) {
 
+		PropertyCreationContext context = new PropertyCreationContext(getLink());
 		return input.stream() //
-				.map(it -> creator.apply(input, it)) //
+				.map(it -> creator.apply(input, it, context)) //
 				.collect(Collectors.toList());
 	}
 
+	@FunctionalInterface
+	public interface PropertyCreator<T> {
+		T apply(InputPayloadMetadata payload, PropertyMetadata metadata, PropertyCreationContext context);
+	}
+
+	public static final class PropertyCreationContext {
+
+		private final Link link;
+
+		private PropertyCreationContext(Link link) {
+			this.link = link;
+		}
+
+		/**
+		 * {@link Link} for the URI of the resource.
+		 */
+		public Link link() {
+			return link;
+		}
+	}
+
 	/*
 	 * (non-Javadoc)
 	 * @see java.lang.Object#equals(java.lang.Object)

src/main/java/org/springframework/hateoas/mediatype/hal/forms/HalFormsConfiguration.java

@@ -21,10 +21,12 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.function.BiFunction;
 import java.util.function.Consumer;
 import java.util.function.Function;
 
 import org.springframework.core.ResolvableType;
+import org.springframework.hateoas.AffordanceModel;
 import org.springframework.hateoas.AffordanceModel.PropertyMetadata;
 import org.springframework.hateoas.MediaTypes;
 import org.springframework.hateoas.mediatype.hal.HalConfiguration;
@@ -165,7 +167,7 @@ public HalFormsConfiguration customize(ObjectMapper mapper) {
 	 * @return
 	 */
 	public <T> HalFormsConfiguration withOptions(Class<T> type, String property,
-			Function<PropertyMetadata, HalFormsOptions> creator) {
+												 BiFunction<PropertyMetadata, AffordanceModel.PropertyCreationContext, HalFormsOptions> creator) {
 
 		return new HalFormsConfiguration(halConfiguration, patterns, options.withOptions(type, property, creator),
 				objectMapperCustomizer, mediaTypes);

src/main/java/org/springframework/hateoas/mediatype/hal/forms/HalFormsOptionsFactory.java

@@ -17,10 +17,12 @@
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.function.BiFunction;
 import java.util.function.Function;
 
 import org.springframework.hateoas.AffordanceModel.PayloadMetadata;
 import org.springframework.hateoas.AffordanceModel.PropertyMetadata;
+import org.springframework.hateoas.AffordanceModel.PropertyCreationContext;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
@@ -34,7 +36,7 @@
  */
 class HalFormsOptionsFactory {
 
-	private final Map<Class<?>, Map<String, Function<PropertyMetadata, HalFormsOptions>>> options;
+	private final Map<Class<?>, Map<String, BiFunction<PropertyMetadata, PropertyCreationContext, HalFormsOptions>>> options;
 
 	/**
 	 * Creates a new, empty {@link HalFormsOptionsFactory}.
@@ -48,7 +50,7 @@ public HalFormsOptionsFactory() {
 	 *
 	 * @param options must not be {@literal null}.
 	 */
-	private HalFormsOptionsFactory(Map<Class<?>, Map<String, Function<PropertyMetadata, HalFormsOptions>>> options) {
+	private HalFormsOptionsFactory(Map<Class<?>, Map<String, BiFunction<PropertyMetadata, PropertyCreationContext, HalFormsOptions>>> options) {
 		this.options = options;
 	}
 
@@ -64,13 +66,13 @@ private HalFormsOptionsFactory(Map<Class<?>, Map<String, Function<PropertyMetada
 	 * @see HalFormsOptions#remote(org.springframework.hateoas.Link)
 	 */
 	HalFormsOptionsFactory withOptions(Class<?> type, String property,
-			Function<PropertyMetadata, HalFormsOptions> creator) {
+			BiFunction<PropertyMetadata, PropertyCreationContext, HalFormsOptions> creator) {
 
 		Assert.notNull(type, "Type must not be null!");
 		Assert.hasText(property, "Property must not be null or empty!");
 		Assert.notNull(creator, "Creator function must not be null!");
 
-		Map<Class<?>, Map<String, Function<PropertyMetadata, HalFormsOptions>>> options = new HashMap<>(this.options);
+		Map<Class<?>, Map<String, BiFunction<PropertyMetadata, PropertyCreationContext, HalFormsOptions>>> options = new HashMap<>(this.options);
 
 		options.compute(type, (it, map) -> {
 
@@ -95,22 +97,22 @@ HalFormsOptionsFactory withOptions(Class<?> type, String property,
 	 * @return
 	 */
 	@Nullable
-	HalFormsOptions getOptions(PayloadMetadata payload, PropertyMetadata property) {
+	HalFormsOptions getOptions(PayloadMetadata payload, PropertyMetadata property, PropertyCreationContext context) {
 
 		Assert.notNull(payload, "Payload metadata must not be null!");
 		Assert.notNull(property, "Property metadata must not be null!");
 
 		Class<?> type = payload.getType();
 		String name = property.getName();
 
-		Map<String, Function<PropertyMetadata, HalFormsOptions>> map = options.get(type);
+		Map<String, BiFunction<PropertyMetadata, PropertyCreationContext, HalFormsOptions>> map = options.get(type);
 
 		if (map == null) {
 			return null;
 		}
 
-		Function<PropertyMetadata, HalFormsOptions> function = map.get(name);
+		BiFunction<PropertyMetadata, PropertyCreationContext, HalFormsOptions> function = map.get(name);
 
-		return function == null ? null : function.apply(property);
+		return function == null ? null : function.apply(property, context);
 	}
 }

src/main/java/org/springframework/hateoas/mediatype/hal/forms/HalFormsPropertyFactory.java

@@ -80,10 +80,10 @@ public List<HalFormsProperty> createProperties(HalFormsAffordanceModel model) {
 
 		HalFormsOptionsFactory optionsFactory = configuration.getOptionsFactory();
 
-		return model.createProperties((payload, metadata) -> {
+		return model.createProperties((payload, metadata, context) -> {
 
 			String inputType = metadata.getInputType();
-			HalFormsOptions options = optionsFactory.getOptions(payload, metadata);
+			HalFormsOptions options = optionsFactory.getOptions(payload, metadata, context);
 
 			HalFormsProperty property = new HalFormsProperty()
 					.withName(metadata.getName())

src/test/java/org/springframework/hateoas/mediatype/hal/forms/HalFormsTemplateBuilderUnitTest.java

@@ -182,7 +182,7 @@ void rendersInlineOptions() {
 		List<String> values = Arrays.asList("1234123412341234", "4321432143214321");
 
 		HalFormsConfiguration configuration = new HalFormsConfiguration() //
-				.withOptions(PatternExample.class, "number", metadata -> HalFormsOptions.inline(values));
+				.withOptions(PatternExample.class, "number", (metadata, context) -> HalFormsOptions.inline(values));
 
 		RepresentationModel<?> models = new RepresentationModel<>(
 				Affordances.of(Link.of("/example", LinkRelation.of("create"))) //
@@ -209,7 +209,7 @@ void propagatesSelectedValueToProperty() {
 
 		HalFormsConfiguration configuration = new HalFormsConfiguration() //
 				.withOptions(PatternExample.class, "number",
-						metadata -> HalFormsOptions.inline(values).withSelectedValue(selected));
+						(metadata, context) -> HalFormsOptions.inline(values).withSelectedValue(selected));
 
 		RepresentationModel<?> models = new RepresentationModel<>(
 				Affordances.of(Link.of("/example", LinkRelation.of("create"))) //