From dbc1c8d5c49517b322d8c6f111a205a56420ce6b Mon Sep 17 00:00:00 2001
From: Alessandro Iezzi <aiezzi@alessandroiezzi.it>
Date: Tue, 13 Jun 2023 18:01:51 +0200
Subject: Add CSVBuilder

---
 .../java/it/alessandroiezzi/csv/CSVBuilder.java    | 68 ++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 src/main/java/it/alessandroiezzi/csv/CSVBuilder.java

diff --git a/src/main/java/it/alessandroiezzi/csv/CSVBuilder.java b/src/main/java/it/alessandroiezzi/csv/CSVBuilder.java
new file mode 100644
index 0000000..fb7367c
--- /dev/null
+++ b/src/main/java/it/alessandroiezzi/csv/CSVBuilder.java
@@ -0,0 +1,68 @@
+/* See LICENSE file for copyright and license details. */
+
+package it.alessandroiezzi.csv;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Consumer;
+
+/**
+ * Used to generate a CSV.
+ */
+public class CSVBuilder {
+	private final String[] header;
+	private final List<String[]> rows = new ArrayList<>();
+	private String separator = ",";
+
+	private String buildRow(String...row) {
+		/* build a CSV row with the separator symbol */
+		StringBuilder csvRow = new StringBuilder();
+
+		for (int i = 0; i < row.length; i++) {
+			/* first column hasn't a separator */
+			if (i > 0) csvRow.append(separator);
+			csvRow.append(row[i]);
+		}
+
+		return csvRow.toString();
+	}
+
+	public CSVBuilder(String...header) {
+		this.header = header;
+	}
+
+	public CSVBuilder append(String...row) {
+		if (row.length != header.length)
+			throw new IllegalArgumentException("The number of columns does not match the header");
+		rows.add(row);
+
+		return this;
+	}
+
+	public String build() {
+		StringBuilder csv = new StringBuilder(buildRow(header));
+		/* add a newline after the header */
+		csv.append("\n");
+
+		int i = 0, n = rows.size();
+		for (String[] row : rows) {
+			csv.append(buildRow(row));
+			if (i++ < n - 1) csv.append("\n");
+		}
+
+		return csv.toString();
+	}
+
+	public CSVBuilder withSeparator(String separator) {
+		this.separator = separator;
+		return this;
+	}
+
+	@Override
+	public String toString() {
+		return build();
+	}
+}
-- 
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