Jackson serializer and deserializer for Java MimeType class

ccm-cms/src/main/java/org/librecms/assets/BinaryAsset.java

@@ -18,6 +18,8 @@
  */
 package org.librecms.assets;
 
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 import org.librecms.contentsection.Asset;
 
 import java.io.Serializable;
@@ -38,6 +40,8 @@ import org.hibernate.envers.NotAudited;
 import org.libreccm.core.UnexpectedErrorException;
 import org.libreccm.jpa.utils.MimeTypeConverter;
 import org.libreccm.l10n.LocalizedString;
+import org.libreccm.ui.admin.imexport.MimeTypeJsonDeserializer;
+import org.libreccm.ui.admin.imexport.MimeTypeJsonSerializer;
 import org.librecms.contentsection.privileges.AssetPrivileges;
 
 import java.io.InputStream;
@@ -149,6 +153,8 @@ public class BinaryAsset extends Asset implements Serializable {
 
     @Column(name = "MIME_TYPE", length = 512, nullable = false)
     @Convert(converter = MimeTypeConverter.class)
+    @JsonSerialize(using = MimeTypeJsonSerializer.class)
+    @JsonDeserialize(using = MimeTypeJsonDeserializer.class)
     private MimeType mimeType;
 
     @Column(name = "ASSET_DATA")

ccm-core/src/main/java/org/libreccm/ui/admin/imexport/MimeTypeJsonDeserializer.java

@@ -0,0 +1,39 @@
+package org.libreccm.ui.admin.imexport;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.JsonNode;
+
+import java.io.IOException;
+
+import javax.activation.MimeType;
+import javax.activation.MimeTypeParseException;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class MimeTypeJsonDeserializer extends JsonDeserializer<MimeType> {
+
+    @Override
+    public MimeType deserialize(
+        final JsonParser parser,
+        final DeserializationContext ctxt
+    ) throws IOException, JsonProcessingException {
+        final JsonNode node = parser.getCodec().readTree(parser);
+        final String value = node.get("mimeType").asText();
+        try {
+            return new MimeType(value);
+        } catch (MimeTypeParseException ex) {
+            throw new IllegalArgumentException(
+                String.format(
+                    "Value \"%s\" not parseable as MimeType.",
+                    value
+                )
+            );
+        }
+    }
+
+}

ccm-core/src/main/java/org/libreccm/ui/admin/imexport/MimeTypeJsonSerializer.java

@@ -0,0 +1,28 @@
+package org.libreccm.ui.admin.imexport;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.SerializerProvider;
+
+import java.io.IOException;
+
+import javax.activation.MimeType;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class MimeTypeJsonSerializer extends JsonSerializer<MimeType> {
+
+    @Override
+    public void serialize(
+        final MimeType value,
+        final JsonGenerator generator,
+        final SerializerProvider serializers
+    ) throws IOException {
+        generator.writeStartObject();
+        generator.writeStringField("mimeType", value.toString());
+        generator.writeEndObject();
+    }
+
+}