From 29402fc27e21b808212f2fa29ce51619d1b83265 Mon Sep 17 00:00:00 2001
From: Edouard DUPIN <yui.heero@gmail.com>
Date: Sat, 3 Feb 2024 18:46:30 +0100
Subject: [PATCH] [DEV] add csv serializator for user export

---
 pom.xml                                       |  7 ++-
 .../serializer/CSVMessageBodyWritter.java     | 57 +++++++++++++++++++
 2 files changed, 63 insertions(+), 1 deletion(-)
 create mode 100644 src/org/kar/archidata/serializer/CSVMessageBodyWritter.java

diff --git a/pom.xml b/pom.xml
index 6fdeb90..9e2b685 100644
--- a/pom.xml
+++ b/pom.xml
@@ -107,7 +107,12 @@
 		<dependency>
 			<groupId>com.fasterxml.jackson.core</groupId>
 			<artifactId>jackson-databind</artifactId>
-			<version>2.16.0</version>
+			<version>2.16.1</version>
+		</dependency>
+		<dependency>
+			<groupId>com.fasterxml.jackson.dataformat</groupId>
+			<artifactId>jackson-dataformat-csv</artifactId>
+			<version>2.16.1</version>
 		</dependency>
 		<dependency>
 			<groupId>jakarta.servlet</groupId>
diff --git a/src/org/kar/archidata/serializer/CSVMessageBodyWritter.java b/src/org/kar/archidata/serializer/CSVMessageBodyWritter.java
new file mode 100644
index 0000000..edbf5f3
--- /dev/null
+++ b/src/org/kar/archidata/serializer/CSVMessageBodyWritter.java
@@ -0,0 +1,57 @@
+package org.kar.archidata.serializer;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Type;
+import java.util.List;
+
+import com.fasterxml.jackson.dataformat.csv.CsvMapper;
+import com.fasterxml.jackson.dataformat.csv.CsvSchema;
+
+import jakarta.ws.rs.Produces;
+import jakarta.ws.rs.WebApplicationException;
+import jakarta.ws.rs.core.MediaType;
+import jakarta.ws.rs.core.MultivaluedMap;
+import jakarta.ws.rs.ext.MessageBodyWriter;
+import jakarta.ws.rs.ext.Provider;
+
+/**
+ * Body writter use in jersey with :
+ * In your main:
+ * ```java
+ * rc.register(new CSVMessageBodyWritter());
+ * ```
+ *
+ * and in the produce element:
+ * ```java
+ * @GET
+ * @Produces("text/csv")
+ * public List<Data> getData() {}
+ * ```
+ */
+@Provider
+@Produces("text/csv")
+public class CSVMessageBodyWritter implements MessageBodyWriter<List<?>> {
+
+	@Override
+	public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
+		return List.class.isAssignableFrom(type);
+	}
+
+	@Override
+	public long getSize(List<?> data, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
+		return 0;
+	}
+
+	@Override
+	public void writeTo(List<?> data, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
+			throws IOException, WebApplicationException {
+		if (data != null && data.size() > 0) {
+			CsvMapper mapper = new CsvMapper();
+			Object o = data.get(0);
+			CsvSchema schema = mapper.schemaFor(o.getClass()).withHeader();
+			mapper.writer(schema).writeValue(entityStream, data);
+		}
+	}
+}