001    /* JAPI - (Yet another (hopefully) useful) Java API
002     *
003     * Copyright (C) 2004-2006 Christian Hujer
004     *
005     * This program is free software; you can redistribute it and/or
006     * modify it under the terms of the GNU General Public License as
007     * published by the Free Software Foundation; either version 2 of the
008     * License, or (at your option) any later version.
009     *
010     * This program is distributed in the hope that it will be useful, but
011     * WITHOUT ANY WARRANTY; without even the implied warranty of
012     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013     * General Public License for more details.
014     *
015     * You should have received a copy of the GNU General Public License
016     * along with this program; if not, write to the Free Software
017     * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
018     * 02111-1307, USA.
019     */
020    
021    package net.sf.japi.io;
022    
023    import java.io.InputStream;
024    import java.io.IOException;
025    import java.io.OutputStream;
026    
027    /** A class with helper methods for In- and Output.
028     * @author <a href="mailto:chris@riedquat.de">Christian Hujer</a>
029     */
030    public class IOHelper {
031    
032        /** Default buffer size. */
033        public static final int DEFAULT_BUF_SIZE = 8192;
034    
035        /** Copies all bytes from one stream to another using a default buffer size (see {@link #DEFAULT_BUF_SIZE}).
036         * @param in InputStream source
037         * @param out OutputStream destination
038         * @throws IOException on i/o problems
039         */
040        public static void copy(final InputStream in, final OutputStream out) throws IOException {
041            copy(in, out, DEFAULT_BUF_SIZE);
042        }
043    
044        /** Copies all bytes from one stream to another using a specified buffer size.
045         * @param in InputStream source
046         * @param out OutputStream destination
047         * @param size buffer size in bytes
048         * @throws IOException on i/o problems
049         */
050        public static void copy(final InputStream in, final OutputStream out, final int size) throws IOException {
051            final byte[] buf = new byte[size];
052            int bytesRead;
053            while ((bytesRead = in.read(buf)) != -1) {
054                out.write(buf, 0, bytesRead);
055            }
056            out.flush();
057        }
058    
059        /** Copies all bytes from one stream to another using a bytewise copy.
060         * @param in InputStream source
061         * @param out OutputStream destination
062         * @throws IOException on i/o problems
063         */
064        public static void copyBW(final InputStream in, final OutputStream out) throws IOException {
065            int byteRead;
066            while ((byteRead = in.read()) != -1) {
067                out.write(byteRead);
068            }
069        }
070    
071        /** private constructor, this class shall not be instantiated because it does not contain any instance information. */
072        private IOHelper() { }
073    
074    } // class IOHelper