com.liferay.portal.kernel.io.unsync.UnsyncBufferedWriter Maven / Gradle / Ivy
/**
* Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
package com.liferay.portal.kernel.io.unsync;
import java.io.IOException;
import java.io.Writer;
/**
*
* See http://issues.liferay.com/browse/LPS-6648.
*
*
* @author Shuyang Zhou
*/
public class UnsyncBufferedWriter extends Writer {
public UnsyncBufferedWriter(Writer writer) {
this(writer, _DEFAULT_BUFFER_SIZE);
}
public UnsyncBufferedWriter(Writer writer, int size) {
if (size <= 0) {
throw new IllegalArgumentException("Size is less than 0");
}
this.writer = writer;
this.size = size;
buffer = new char[size];
}
@Override
public void close() throws IOException {
if (writer == null) {
return;
}
if (count > 0) {
writer.write(buffer, 0, count);
count = 0;
}
writer.flush();
writer.close();
writer = null;
buffer = null;
}
@Override
public void flush() throws IOException {
if (writer == null) {
throw new IOException("Writer is null");
}
if (count > 0) {
writer.write(buffer, 0, count);
count = 0;
}
writer.flush();
}
public void newLine() throws IOException {
write(_LINE_SEPARATOR);
}
@Override
public void write(char[] chars, int offset, int length) throws IOException {
if (writer == null) {
throw new IOException("Writer is null");
}
if (length >= size) {
if (count > 0) {
writer.write(buffer, 0, count);
count = 0;
}
writer.write(chars, offset, length);
return;
}
if ((count > 0) && (length > (size - count))) {
writer.write(buffer, 0, count);
count = 0;
}
System.arraycopy(chars, offset, buffer, count, length);
count += length;
}
@Override
public void write(int c) throws IOException {
if (writer == null) {
throw new IOException("Writer is null");
}
if (count >= size) {
writer.write(buffer);
count = 0;
}
buffer[count++] = (char)c;
}
@Override
public void write(String string, int offset, int length)
throws IOException {
if (writer == null) {
throw new IOException("Writer is null");
}
int x = offset;
int y = offset + length;
while (x < y) {
if (count >= size) {
writer.write(buffer);
count = 0;
}
int leftFreeSpace = size - count;
int leftDataSize = y - x;
if (leftFreeSpace > leftDataSize) {
string.getChars(x, y, buffer, count);
count += leftDataSize;
break;
}
else {
int copyEnd = x + leftFreeSpace;
string.getChars(x, copyEnd, buffer, count);
count += leftFreeSpace;
x = copyEnd;
}
}
}
protected char[] buffer;
protected int count;
protected int size;
protected Writer writer;
private static final int _DEFAULT_BUFFER_SIZE = 8192;
private static final String _LINE_SEPARATOR = System.getProperty(
"line.separator");
}