Fast BufferedOutputStream : BufferedOutputStream « File Input Output « Java

1. Java
2. File Input Output
3. BufferedOutputStream

Fast BufferedOutputStream

 
/*
 * @(#)$Id$
 *
 * Copyright 2006-2008 Makoto YUI
 *
 * 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.
 * 
 * Contributors:
 *     Makoto YUI - initial implementation
 */
//package xbird.util.io;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * 
 * <DIV lang="en"></DIV>
 * <DIV lang="ja"></DIV>
 * 
 * @author Makoto YUI (yuin405+xbird@gmail.com)
 */
public final class FastBufferedOutputStream extends FilterOutputStream {

    private byte buf[];
    private int count;

    public FastBufferedOutputStream(OutputStream out) {
        this(out, 8192);
    }

    public FastBufferedOutputStream(OutputStream out, int size) {
        super(out);
        if(size <= 0) {
            throw new IllegalArgumentException("Buffer size <= 0");
        }
        buf = new byte[size];
    }

    @Override
    public void write(int b) throws IOException {
        if(count >= buf.length) {
            flushBuffer();
        }
        buf[count++] = (byte) b;
    }

    @Override
    public void write(byte b[], int off, int len) throws IOException {
        if(len >= buf.length) {
            flushBuffer();
            out.write(b, off, len);
            return;
        }
        if(len > buf.length - count) {
            flushBuffer();
        }
        System.arraycopy(b, off, buf, count, len);
        count += len;
    }

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

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

   
  

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