public static void main(String[] args) {
Buffer buf = null;
if (args.length == 0) {
System.out.println("引数がありません");
System.exit(1);
}
// Empty
buf = LineBuffer.getInstance();
System.out.println("Empty Buffer Created");
System.out.println("size = " + buf.lengthByLine());
for (int i = 0; i < buf.lengthByLine(); i++) {
System.out.print(buf.readLine(i));
}
// From File
File file = new File(args[0]);
try {
buf = LineBuffer.getInstance(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("Buffer Created From File");
System.out.println("size = " + buf.lengthByLine());
for (int i = 0; i < buf.lengthByLine(); i++) {
System.out.print(buf.readLine(i));
}
// From Reader1
try {
buf = LineBuffer.getInstance(new StringReader("aaa\nbbb\nccc\nddd\n"));
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("Buffer Created From Reader");
System.out.println("size = " + buf.lengthByLine());
for (int i = 0; i < buf.lengthByLine(); i++) {
System.out.print(buf.readLine(i));
}
// From Reader2
try {
buf = LineBuffer.getInstance(new StringReader("aaa\nbbb\nccc\nddd"));
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("Buffer Created From Reader");
System.out.println("size = " + buf.lengthByLine());
for (int i = 0; i < buf.lengthByLine(); i++) {
System.out.print(buf.readLine(i));
}
}
/**
* Reads a line of text. A line is considered to be terminated by any one of a line feed ({@code
* '\n'}), a carriage return ({@code '\r'}), or a carriage return followed immediately by a
* linefeed ({@code "\r\n"}).
*
* @return a {@code String} containing the contents of the line, not including any
* line-termination characters, or {@code null} if the end of the stream has been reached.
* @throws IOException if an I/O error occurs
*/
public String readLine() throws IOException {
while (lines.peek() == null) {
cbuf.clear();
// The default implementation of Reader#read(CharBuffer) allocates a
// temporary char[], so we call Reader#read(char[], int, int) instead.
int read = (reader != null) ? reader.read(buf, 0, buf.length) : readable.read(cbuf);
if (read == -1) {
lineBuf.finish();
break;
}
lineBuf.add(buf, 0, read);
}
return lines.poll();
}
/**
* Read a Line ended by CR, LF or CRLF. Read a line into a shared LineBuffer instance. The
* LineBuffer is resused between calls and should not be held by the caller. The default or
* supplied encoding is used to convert bytes to characters.
*
* @param len Maximum length of a line, or 0 for default
* @return LineBuffer instance or null for EOF
* @throws IOException
*/
public LineBuffer readLineBuffer(int len) throws IOException {
len = fillLine(len > 0 ? len : buf.length);
if (len < 0) return null;
if (len == 0) {
lineBuffer.size = 0;
return lineBuffer;
}
byteBuffer.setStream(mark, len);
lineBuffer.size = 0;
int read = 0;
while (read < len && reader.ready()) {
int r = reader.read(lineBuffer.buffer, read, len - read);
if (r <= 0) break;
read += r;
}
lineBuffer.size = read;
mark = -1;
return lineBuffer;
}
