BAEL-3097 init for mapstruct custom mapping method

mapstruct/src/main/java/com/baeldung/dto/UrlDTO.java

@@ -0,0 +1,11 @@
+package com.baeldung.dto;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class UrlDTO {
+    private String url;
+    private String subUrl;
+}

mapstruct/src/main/java/com/baeldung/entity/UrlObject.java

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+package com.baeldung.entity;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class UrlObject {
+    private String url;
+    private String subUrl;
+}

mapstruct/src/main/java/com/baeldung/mapper/SuffixRemover.java

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+package com.baeldung.mapper;
+
+import org.mapstruct.Qualifier;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Qualifier
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.CLASS)
+public @interface SuffixRemover {}

mapstruct/src/main/java/com/baeldung/mapper/UrlMapper.java

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+package com.baeldung.mapper;
+
+import com.baeldung.dto.UrlDTO;
+import com.baeldung.entity.UrlObject;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.Named;
+import org.mapstruct.factory.Mappers;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+
+@Mapper
+public interface UrlMapper {
+
+    UrlMapper INSTANCE = Mappers.getMapper(UrlMapper.class);
+
+
+    @Mapping(source = "subUrl", target = "subUrl", qualifiedByName = "protocolRemover")
+    @Mapping(source = "url", target = "url", qualifiedBy = SuffixRemover.class)
+    public UrlObject urlObjectDomainMapper(UrlDTO urlDTO);
+
+    @Named("protocolRemover")
+    public static String protocolRemoverWithCustomMethod(String domain) throws URISyntaxException {
+        URI uri = new URI(domain);
+        return uri.getHost();
+    }
+
+    @SuffixRemover
+    public static String protocolRemoverMethod(String domain) throws URISyntaxException {
+        URI uri = new URI(domain);
+        return uri.getHost();
+    }
+}

mapstruct/src/test/java/com/baeldung/mapper/UrlMapperTest.java

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+package com.baeldung.mapper;
+
+import com.baeldung.dto.UrlDTO;
+import com.baeldung.entity.UrlObject;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class UrlMapperTest {
+
+    @Test
+    public void givenDomains_whenCallDomainMapper_thenReturnDomainsWithoutProtocols() {
+        UrlDTO dto = new UrlDTO();
+        dto.setUrl("http://www.baeldung.com");
+        dto.setSubUrl("https://www.baeldung.com");
+
+        UrlObject urlObject = UrlMapper.INSTANCE.urlObjectDomainMapper(dto);
+
+        assertEquals(urlObject.getUrl(), "www.baeldung.com");
+        assertEquals(urlObject.getSubUrl(), "www.baeldung.com");
+    }
+}