{"id":18112,"date":"2024-03-15T16:16:04","date_gmt":"2024-03-15T16:16:04","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-ignore-empty-strings-when-mapping-in-mapster\/"},"modified":"2024-03-21T12:31:49","modified_gmt":"2024-03-21T12:31:49","slug":"how-to-ignore-empty-strings-when-mapping-in-mapster","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-ignore-empty-strings-when-mapping-in-mapster\/","title":{"rendered":"How to ignore empty strings when mapping in Mapster?"},"content":{"rendered":"<p>In MapStruct, you can use the NullValueMappingStrategy and Expression annotations to ignore mapping empty strings.<\/p>\n<p>Firstly, add the nullValueMappingStrategy annotation to your Mapper interface or class and set its value to NullValueMappingStrategy.RETURN_DEFAULT. This will instruct MapStruct to ignore empty strings during the mapping process.<\/p>\n<p>For example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">@Mapper(nullValueMappingStrategy = NullValueMappingStrategy.RETURN_DEFAULT)<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">interface<\/span> <span class=\"hljs-title class_\">MyMapper<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u6620\u5c04\u65b9\u6cd5<\/span>\r\n}\r\n<\/code><\/pre>\n<p>Next, add an Expression annotation to the properties where empty strings need to be ignored, and use a SpEL expression to specify a condition for mapping empty strings to a default value.<\/p>\n<p>For example, if you have a property named &#8220;name&#8221; and you want to ignore empty strings during mapping, you can do the following:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">@Mapping(target = \"name\", source = \"name\", qualifiedByName = \"ignoreEmptyString\")<\/span>\r\nDestinationObject <span class=\"hljs-title function_\">map<\/span><span class=\"hljs-params\">(SourceObject source)<\/span>;\r\n\r\n<span class=\"hljs-meta\">@Named(\"ignoreEmptyString\")<\/span>\r\n<span class=\"hljs-keyword\">default<\/span> String <span class=\"hljs-title function_\">ignoreEmptyString<\/span><span class=\"hljs-params\">(String value)<\/span> {\r\n    <span class=\"hljs-keyword\">return<\/span> value.isEmpty() ? <span class=\"hljs-literal\">null<\/span> : value;\r\n}\r\n<\/code><\/pre>\n<p>In the example above, we used the qualifiedByName attribute in the @Mapping annotation of the mapping method and specified it as &#8220;ignoreEmptyString&#8221;. We then added a default method named ignoreEmptyString in the Mapper interface, which takes a string parameter and returns a string. In this method, we implemented a condition that returns null if the string is empty, otherwise it returns the original string.<\/p>\n<p>In this way, MapStruct will determine whether to map empty strings to default values based on the logic of the ignoreEmptyString method.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In MapStruct, you can use the NullValueMappingStrategy and Expression annotations to ignore mapping empty strings. Firstly, add the nullValueMappingStrategy annotation to your Mapper interface or class and set its value to NullValueMappingStrategy.RETURN_DEFAULT. This will instruct MapStruct to ignore empty strings during the mapping process. For example: @Mapper(nullValueMappingStrategy = NullValueMappingStrategy.RETURN_DEFAULT) public interface MyMapper { \/\/ \u6620\u5c04\u65b9\u6cd5 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-18112","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to ignore empty strings when mapping in Mapster? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-ignore-empty-strings-when-mapping-in-mapster\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to ignore empty strings when mapping in Mapster?\" \/>\n<meta property=\"og:description\" content=\"In MapStruct, you can use the NullValueMappingStrategy and Expression annotations to ignore mapping empty strings. Firstly, add the nullValueMappingStrategy annotation to your Mapper interface or class and set its value to NullValueMappingStrategy.RETURN_DEFAULT. This will instruct MapStruct to ignore empty strings during the mapping process. 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