Do not include null on serilized model

Signed-off-by: Valentin Delaye <jonesbusy@users.noreply.github.com>

Author: jonesbusy

src/main/java/land/oras/Config.java

@@ -22,6 +22,7 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
 import java.nio.charset.StandardCharsets;
@@ -45,6 +46,7 @@
     Const.JSON_PROPERTY_ANNOTATIONS,
     Const.JSON_PROPERTY_DATA
 })
+@JsonInclude(JsonInclude.Include.NON_NULL)
 public final class Config extends Descriptor {
 
     /**

src/main/java/land/oras/Describable.java

@@ -20,10 +20,13 @@
 
 package land.oras;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
+
 /**
  * Interface for describable objects
  */
 @OrasModel
+@JsonInclude(JsonInclude.Include.NON_NULL)
 public interface Describable {
 
     /**

src/main/java/land/oras/Descriptor.java

@@ -21,6 +21,7 @@
 package land.oras;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
 import java.util.Collections;
@@ -35,6 +36,7 @@
  */
 @OrasModel
 @JsonPropertyOrder({Const.JSON_PROPERTY_MEDIA_TYPE, Const.JSON_PROPERTY_DIGEST, Const.JSON_PROPERTY_SIZE})
+@JsonInclude(JsonInclude.Include.NON_NULL)
 public sealed class Descriptor permits Config, Manifest, Layer, Index {
 
     /**

src/main/java/land/oras/Layer.java

@@ -22,6 +22,7 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
 import java.io.IOException;
@@ -49,6 +50,7 @@
     Const.JSON_PROPERTY_ANNOTATIONS,
     Const.JSON_PROPERTY_DATA
 })
+@JsonInclude(JsonInclude.Include.NON_NULL)
 public final class Layer extends Descriptor {
 
     /**

src/main/java/land/oras/ManifestDescriptor.java

@@ -22,6 +22,7 @@
 
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
 import java.util.Map;
@@ -45,6 +46,7 @@
     Const.JSON_PROPERTY_PLATFORM,
     Const.JSON_PROPERTY_ANNOTATIONS,
 })
+@JsonInclude(JsonInclude.Include.NON_NULL)
 public final class ManifestDescriptor {
 
     private final @Nullable String artifactType;

src/main/java/land/oras/Platform.java

@@ -20,6 +20,7 @@
 
 package land.oras;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
 import java.util.List;
@@ -46,6 +47,7 @@
     Const.PLATFORM_OS_VERSION,
     Const.PLATFORM_OS_FEATURES
 })
+@JsonInclude(JsonInclude.Include.NON_NULL)
 public record Platform(
         @Nullable @JsonProperty(Const.PLATFORM_OS) String os,
         @Nullable @JsonProperty(Const.PLATFORM_ARCHITECTURE) String architecture,

src/main/java/land/oras/Subject.java

@@ -21,6 +21,7 @@
 package land.oras;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
 import java.util.Objects;
@@ -38,6 +39,7 @@
     Const.JSON_PROPERTY_DIGEST,
     Const.JSON_PROPERTY_SIZE,
 })
+@JsonInclude(JsonInclude.Include.NON_NULL)
 public final class Subject {
 
     private final String mediaType;

src/main/java/land/oras/Tags.java

@@ -20,6 +20,7 @@
 
 package land.oras;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
 import java.util.List;
 import org.jspecify.annotations.NullMarked;
 import org.jspecify.annotations.Nullable;
@@ -32,6 +33,7 @@
  */
 @NullMarked
 @OrasModel
+@JsonInclude(JsonInclude.Include.NON_NULL)
 public record Tags(String name, List<String> tags, @Nullable String last) {
 
     /**