X-Git-Url: https://git.argeo.org/?a=blobdiff_plain;f=org.argeo.enterprise%2Fsrc%2Forg%2Fargeo%2Futil%2FCsvWriter.java;fp=org.argeo.enterprise%2Fsrc%2Forg%2Fargeo%2Futil%2FCsvWriter.java;h=c3b3a3ad7b43afa5989871fcaf0f223b1259a763;hb=fba24f5ac520b99b3ac75781c95f11c48ac6252f;hp=0000000000000000000000000000000000000000;hpb=3fbd05aa39ef235128e134fde8fd24167208e781;p=lgpl%2Fargeo-commons.git

diff --git a/org.argeo.enterprise/src/org/argeo/util/CsvWriter.java b/org.argeo.enterprise/src/org/argeo/util/CsvWriter.java
new file mode 100644
index 000000000..c3b3a3ad7
--- /dev/null
+++ b/org.argeo.enterprise/src/org/argeo/util/CsvWriter.java
@@ -0,0 +1,156 @@
+package org.argeo.util;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.UnsupportedEncodingException;
+import java.io.Writer;
+import java.nio.charset.Charset;
+import java.util.Iterator;
+import java.util.List;
+
+/** Write in CSV format. */
+public class CsvWriter {
+	private final Writer out;
+
+	private char separator = ',';
+	private char quote = '\"';
+
+	/**
+	 * Creates a CSV writer.
+	 * 
+	 * @param out the stream to write to. Caller is responsible for closing it.
+	 * 
+	 * @deprecated Use {@link #CsvWriter(OutputStream, Charset)} instead.
+	 * 
+	 */
+	@Deprecated
+	public CsvWriter(OutputStream out) {
+		this.out = new OutputStreamWriter(out);
+	}
+
+	/**
+	 * Creates a CSV writer.
+	 * 
+	 * @param out      the stream to write to. Caller is responsible for closing it.
+	 * @param encoding the encoding to use.
+	 * 
+	 * @deprecated Use {@link #CsvWriter(OutputStream, Charset)} instead.
+	 */
+	@Deprecated
+	public CsvWriter(OutputStream out, String encoding) {
+		try {
+			this.out = new OutputStreamWriter(out, encoding);
+		} catch (UnsupportedEncodingException e) {
+			throw new IllegalArgumentException(e);
+		}
+	}
+
+	/**
+	 * Creates a CSV writer.
+	 * 
+	 * @param out     the stream to write to. Caller is responsible for closing it.
+	 * @param charset the charset to use
+	 */
+	public CsvWriter(OutputStream out, Charset charset) {
+		this.out = new OutputStreamWriter(out, charset);
+	}
+
+	/**
+	 * Creates a CSV writer.
+	 * 
+	 * @param out the stream to write to. Caller is responsible for closing it.
+	 */
+	public CsvWriter(Writer writer) {
+		this.out = writer;
+	}
+
+	/**
+	 * Write a CSV line. Also used to write a header if needed (this is transparent
+	 * for the CSV writer): simply call it first, before writing the lines.
+	 */
+	public void writeLine(List<?> tokens) {
+		try {
+			Iterator<?> it = tokens.iterator();
+			while (it.hasNext()) {
+				Object obj = it.next();
+				writeToken(obj != null ? obj.toString() : null);
+				if (it.hasNext())
+					out.write(separator);
+			}
+			out.write('\n');
+			out.flush();
+		} catch (IOException e) {
+			throw new RuntimeException("Could not write " + tokens, e);
+		}
+	}
+
+	/**
+	 * Write a CSV line. Also used to write a header if needed (this is transparent
+	 * for the CSV writer): simply call it first, before writing the lines.
+	 */
+	public void writeLine(Object[] tokens) {
+		try {
+			for (int i = 0; i < tokens.length; i++) {
+				if (tokens[i] == null) {
+					writeToken(null);
+				} else {
+					writeToken(tokens[i].toString());
+				}
+				if (i != (tokens.length - 1))
+					out.write(separator);
+			}
+			out.write('\n');
+			out.flush();
+		} catch (IOException e) {
+			throw new RuntimeException("Could not write " + tokens, e);
+		}
+	}
+
+	protected void writeToken(String token) throws IOException {
+		if (token == null) {
+			// TODO configure how to deal with null
+			out.write("");
+			return;
+		}
+		// +2 for possible quotes, another +2 assuming there would be an already
+		// quoted string where quotes needs to be duplicated
+		// another +2 for safety
+		// we don't want to increase buffer size while writing
+		StringBuffer buf = new StringBuffer(token.length() + 6);
+		char[] arr = token.toCharArray();
+		boolean shouldQuote = false;
+		for (char c : arr) {
+			if (!shouldQuote) {
+				if (c == separator)
+					shouldQuote = true;
+				if (c == '\n')
+					shouldQuote = true;
+			}
+
+			if (c == quote) {
+				shouldQuote = true;
+				// duplicate quote
+				buf.append(quote);
+			}
+
+			// generic case
+			buf.append(c);
+		}
+
+		if (shouldQuote == true)
+			out.write(quote);
+		out.write(buf.toString());
+		if (shouldQuote == true)
+			out.write(quote);
+	}
+
+	public void setSeparator(char separator) {
+		this.separator = separator;
+	}
+
+	public void setQuote(char quote) {
+		this.quote = quote;
+	}
+
+}