Class PlatformLineWriter

src/main/java/groovy/io/PlatformLineWriter.java:33–86

A buffered writer that gobbles any \r characters and replaces every \n with a platform specific newline. In many places Groovy normalises streams to only have \n characters but when creating files that must be used by other platform-aware tools, you sometimes want the newlines to match what the plat

 * newlines to match what the platform expects.
 */
public class PlatformLineWriter extends Writer {
    private final BufferedWriter writer;

    /**
     * Creates a writer that normalizes line endings for the platform.
     *
     * @param out the underlying writer
     */
    public PlatformLineWriter(Writer out) {
        writer = new BufferedWriter(out);
    }

    /**
     * Creates a writer that normalizes line endings for the platform.
     *
     * @param out the underlying writer
     * @param sz the output buffer size
     */
    public PlatformLineWriter(Writer out, int sz) {
        writer = new BufferedWriter(out, sz);
    }

    /**
     * Writes characters while converting line endings to the platform format.
     *
     * @param cbuf the source buffer
     * @param off the buffer offset
     * @param len the number of characters to write
     * @throws IOException if an I/O error occurs
     */
    @Override
    public void write(char[] cbuf, int off, int len) throws IOException {
        for (; len > 0; len--) {
            char c = cbuf[off++];
            if (c == '\n') {
                writer.newLine();
            } else if (c != '\r') {
                writer.write(c);
            }
        }
    }

    /** {@inheritDoc} */
    @Override
    public void flush() throws IOException {
        writer.flush();
    }

    /** {@inheritDoc} */
    @Override
    public void close() throws IOException {
        writer.close();
    }
}