/*
 
* Copyright 2015 Oliver Siegmar
 
*
 
* 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 de.siegmar.fastcsv.writer;

import java.io.IOException;
import java.io.Writer;

/**
 
* Unsynchronized and thus high performance replacement for BufferedWriter.
 
*
 
* This class is intended for internal use only.
 
*
 
* @author Oliver Siegmar
 
*/

final class FastBufferedWriter extends Writer {

    
private static final int BUFFER_SIZE = 8192;

    
private Writer out;
    
private char[] buf = new char[BUFFER_SIZE];
    
private int pos;

    
FastBufferedWriter(final Writer writer) {
        
this.out = writer;
    
}

    
@Override
    
public void write(final char[] cbuf, final int off, final int len) throws IOException {
        
if (pos + len >= buf.length) {
            
flushBuffer();
        
}

        
if (len >= buf.length) {
            
out.write(cbuf, off, len);
        
} else {
            
System.arraycopy(cbuf, off, buf, pos, len);
            
pos += len;
        
}
    
}

    
@Override
    
public void write(final int c) throws IOException {
        
if (pos == buf.length) {
            
flushBuffer();
        
}
        
buf[pos++] = (char) c;
    
}

    
@Override
    
public void close() throws IOException {
        
flushBuffer();
        
out.close();
    
}

    
@Override
    
public void flush() throws IOException {
        
flushBuffer();
        
out.flush();
    
}

    
private void flushBuffer() throws IOException {
        
out.write(buf, 0, pos);
        
pos = 0;
    
}

}