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BufferedWriter.java
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129 lines (109 loc) · 3.14 KB
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/* Copyright (c) 2007 Jython Developers */
package org.python.core.io;
import java.nio.ByteBuffer;
/**
* Buffer for a writable sequential RawIO object.
*
* @author Philip Jenvey
*/
public class BufferedWriter extends BufferedIOMixin {
/** The underlying buffer */
protected ByteBuffer buffer;
/**
* Construct a BufferedWriter of bufferSize, wrapping the given
* RawIOBase.
*
* @param rawIO {@inheritDoc}
* @param bufferSize {@inheritDoc}
*/
public BufferedWriter(RawIOBase rawIO, int bufferSize) {
super(rawIO, bufferSize);
rawIO.checkWritable();
buffer = ByteBuffer.allocate(this.bufferSize);
}
@Override
public int write(ByteBuffer bytes) {
if (bufferSize == 0) {
return rawIO.write(bytes);
}
int bytesSize = bytes.remaining();
// The total amount of data on hand; the buffer plus 'bytes'
int total = buffer.position() + bytesSize;
if (total < bufferSize) {
// Have less than bufferSize on hand: just buffer
buffer.put(bytes);
return bytesSize;
}
// The amount of 'bytes' leftover, to buffer, after writing in
// bufferSize chunks
int toBuffer = total % bufferSize;
// The amount of 'bytes' to be written
int bytesToWrite = bytesSize - toBuffer;
int origBytesLimit = bytes.limit();
bytes.limit(bytes.position() + bytesToWrite);
int totalToWrite = total - toBuffer;
int count = totalToWrite;
ByteBuffer[] bulk = new ByteBuffer[] {buffer, bytes};
// Prepare the buffer for writing
buffer.flip();
while (count > 0) {
count -= rawIO.write(bulk);
}
// Prepare the buffer for buffering
buffer.clear();
if (toBuffer > 0) {
bytes.limit(origBytesLimit);
buffer.put(bytes);
}
return totalToWrite;
}
@Override
public void flush() {
if (buffer.position() > 0) {
buffer.flip();
while (buffer.hasRemaining()) {
rawIO.write(buffer);
}
buffer.clear();
}
super.flush();
}
@Override
public long tell() {
return rawIO.tell() + buffer.position();
}
@Override
public long seek(long pos, int whence) {
flush();
return rawIO.seek(pos, whence);
}
@Override
public boolean buffered() {
return buffer.position() > 0;
}
@Override
public ByteBuffer readall() {
// Never readable; just raise the appropriate exception
checkClosed();
checkReadable();
return null;
}
@Override
public int readinto(ByteBuffer bytes) {
// Never readable; just raise the appropriate exception
checkClosed();
checkReadable();
return -1;
}
@Override
public int read1(ByteBuffer bytes) {
// Never readable; just raise the appropriate exception
checkClosed();
checkReadable();
return -1;
}
@Override
public boolean readable() {
return false;
}
}