Simplify format handling

Signed-off-by: hojooo <ghwn5833@gmail.com>

Author: hojooo

buildpack/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/DockerApi.java

@@ -344,7 +344,7 @@ public void exportLayers(ImageReference reference, @Nullable ImagePlatform platf
 			if (platform != null) {
 				if (getApiVersion().supports(EXPORT_PLATFORM_API_VERSION)) {
 					uri = buildUrl(EXPORT_PLATFORM_API_VERSION, "/images/" + reference + "/get", "platform",
-							platform.toQueryParameter(getApiVersion()));
+							platform.toJson());
 				}
 			}
 			try (Response response = http().get(uri)) {
@@ -385,7 +385,7 @@ private Image inspect(ApiVersion apiVersion, ImageReference reference, @Nullable
 				throws IOException {
 			Assert.notNull(reference, "'reference' must not be null");
             URI imageUri = (platform != null)
-                    ? buildUrl(apiVersion, "/images/" + reference + "/json", "platform", platform.toQueryParameter(getApiVersion()))
+                    ? buildUrl(apiVersion, "/images/" + reference + "/json", "platform", platform.toJson())
                     : buildUrl(apiVersion, "/images/" + reference + "/json");
 			try (Response response = http().get(imageUri)) {
 				return Image.of(response.getContent());

buildpack/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/type/ImagePlatform.java

@@ -102,30 +102,21 @@ public static ImagePlatform from(Image image) {
 	}
 
 	/**
-	 * Return the value to use for the Docker API {@code platform} query parameter for the
-	 * given API version.
-	 *
-	 * For API versions that support JSON (1.49 and above), this method returns a JSON
-	 * object in the form {@code {"os":"...","architecture":"...","variant":"..."}}.
-	 * For lower API versions, the legacy string representation {@code os[/arch[/variant]]}
-	 * is returned.
-	 * @param apiVersion the Docker API version to target
-	 * @return the query parameter value to use for {@code platform}
+	 * Return a JSON-encoded representation of this platform for use with Docker Engine
+	 * API 1.48+ endpoints that require the platform parameter in JSON format
+	 * (e.g., image inspect and export operations).
+	 * @return a JSON object in the form {@code {"os":"...","architecture":"...","variant":"..."}}
 	 */
-	public String toQueryParameter(ApiVersion apiVersion) {
-		Assert.notNull(apiVersion, "'apiVersion' must not be null");
-		if (apiVersion.supports(ApiVersion.of(1, 49))) {
-			StringBuilder json = new StringBuilder("{");
-			json.append("\"os\":\"").append(this.os).append("\"");
-			if (this.architecture != null && !this.architecture.isEmpty()) {
-				json.append(",\"architecture\":\"").append(this.architecture).append("\"");
-			}
-			if (this.variant != null && !this.variant.isEmpty()) {
-				json.append(",\"variant\":\"").append(this.variant).append("\"");
-			}
-			json.append("}");
-			return json.toString();
+	public String toJson() {
+		StringBuilder json = new StringBuilder("{");
+		json.append("\"os\":\"").append(this.os).append("\"");
+		if (this.architecture != null && !this.architecture.isEmpty()) {
+			json.append(",\"architecture\":\"").append(this.architecture).append("\"");
 		}
-		return toString();
+		if (this.variant != null && !this.variant.isEmpty()) {
+			json.append(",\"variant\":\"").append(this.variant).append("\"");
+		}
+		json.append("}");
+		return json.toString();
 	}
 }