/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2003 The Apache Software Foundation.  All rights 
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer. 
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. The end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:  
*       "This product includes software developed by the
*        Apache Software Foundation (http://www.apache.org/)."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must 
*    not be used to endorse or promote products derived from this
*    software without prior written permission. For written 
*    permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache 
*    XMLBeans", nor may "Apache" appear in their name, without prior 
*    written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2000-2003 BEA Systems 
* Inc., <http://www.bea.com/>. For more information on the Apache Software
* Foundation, please see <http://www.apache.org/>.
*/

package org.apache.xmlbeans.impl.common;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.net.URI;
import java.nio.channels.FileChannel;

public class IOUtil
{
    public static void copyCompletely(InputStream input, OutputStream output)
        throws IOException
    {
        //if both are file streams, use channel IO
        if ((output instanceof FileOutputStream) && (input instanceof FileInputStream))
        {
            try
            {
                FileChannel target = ((FileOutputStream) output).getChannel();
                FileChannel source = ((FileInputStream) input).getChannel();
                
                source.transferTo(0, Integer.MAX_VALUE, target);
                
                source.close();
                target.close();
                
                return;
            }
            catch (Exception e)
            { /* failover to byte stream version */ }
        }
        
        byte[] buf = new byte[8192];
        while (true)
        {
            int length = input.read(buf);
            if (length < 0)
                break;
            output.write(buf, 0, length);
        }
        
        try { input.close(); } catch (IOException ignore) {}
        try { output.close(); } catch (IOException ignore) {}
    }

    public static void copyCompletely(URI input, URI output)
        throws IOException
    {
        try
        {
            InputStream in = null;
            try
            {
                File f = new File(input);
                if (f.exists())
                    in = new FileInputStream(f);
            }
            catch (Exception notAFile)
            {}
            
            File out = new File(output);
            File dir = out.getParentFile();
            dir.mkdirs();
            
            if (in == null)
                in = input.toURL().openStream();
                
            IOUtil.copyCompletely(in, new FileOutputStream(out));
        }
        catch (IllegalArgumentException e)
        {
            throw new IOException("Cannot copy to " + output);
        }
    }

}