X-Git-Url: http://git.argeo.org/?a=blobdiff_plain;f=base%2Fruntime%2Forg.argeo.basic.nodeps%2Fsrc%2Fmain%2Fjava%2Forg%2Fargeo%2Futil%2FCsvWriter.java;fp=base%2Fruntime%2Forg.argeo.basic.nodeps%2Fsrc%2Fmain%2Fjava%2Forg%2Fargeo%2Futil%2FCsvWriter.java;h=b3f383883970a09ebee6feb624ae6f60cc4f216a;hb=2fcbd437ed0a3987b461da585f685bf1f1a0d6db;hp=0000000000000000000000000000000000000000;hpb=e39d1cffbca5b2a6d5d7b6e20e7d75417a71c9b8;p=lgpl%2Fargeo-commons.git

diff --git a/base/runtime/org.argeo.basic.nodeps/src/main/java/org/argeo/util/CsvWriter.java b/base/runtime/org.argeo.basic.nodeps/src/main/java/org/argeo/util/CsvWriter.java
new file mode 100644
index 000000000..b3f383883
--- /dev/null
+++ b/base/runtime/org.argeo.basic.nodeps/src/main/java/org/argeo/util/CsvWriter.java
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2007-2012 Mathieu Baudier
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+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.util.Iterator;
+import java.util.List;
+
+import org.argeo.ArgeoException;
+
+/** 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.
+	 */
+	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.
+	 */
+	public CsvWriter(OutputStream out, String encoding) {
+		try {
+			this.out = new OutputStreamWriter(out, encoding);
+		} catch (UnsupportedEncodingException e) {
+			throw new ArgeoException("Cannot initialize CSV writer", 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(List<?> tokens) {
+		try {
+			Iterator<?> it = tokens.iterator();
+			while (it.hasNext()) {
+				writeToken(it.next().toString());
+				if (it.hasNext())
+					out.write(separator);
+			}
+			out.write('\n');
+			out.flush();
+		} catch (IOException e) {
+			throw new ArgeoException("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) {
+					// TODO configure how to deal with null
+					writeToken("");
+				} else {
+					writeToken(tokens[i].toString());
+				}
+				if (i != (tokens.length - 1))
+					out.write(separator);
+			}
+			out.write('\n');
+			out.flush();
+		} catch (IOException e) {
+			throw new ArgeoException("Could not write " + tokens, e);
+		}
+	}
+
+	protected void writeToken(String token) throws IOException {
+		// +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;
+	}
+
+}