/*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the License).  You may not use this file except in
 * compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * https://glassfish.dev.java.net/public/CDDLv1.0.html or
 * glassfish/bootstrap/legal/CDDLv1.0.txt.
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * Header Notice in each file and include the License file 
 * at glassfish/bootstrap/legal/CDDLv1.0.txt.  
 * If applicable, add the following below the CDDL Header, 
 * with the fields enclosed by brackets [] replaced by
 * you own identifying information: 
 * "Portions Copyrighted [year] [name of copyright owner]"
 * 
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 */

/* Byron Nevins, April 2000
 * ZipFile -- A utility class for exploding jar files that contain EJB(s).  Used *only* in this package by the EJBImporter class
 */

package com.sun.enterprise.config.backup.util;

import java.io.*;
import java.util.*;
import java.util.zip.*;


public class ZipWriter
{
	public ZipWriter(String zipFilename, String dirName) throws ZipFileException
	{
		init(zipFilename, dirName);
		createItemList(null);
	}

	///////////////////////////////////////////////////////////////////////////////////////////////////////
	
	public ZipWriter(String zipFilename, String dirName, ZipItem[] theItems) throws ZipFileException
	{
		items = theItems;
		init(zipFilename, dirName);
	}

	///////////////////////////////////////////////////////////////////////////////////////////////////////
	
	public ZipWriter(String zipFilename, String dirName, String[] fileList) throws ZipFileException
	{
		init(zipFilename, dirName);
		createItemList(fileList);
	}

	///////////////////////////////////////////////////////////////////////////////////////////////////////
	
	public ZipWriter(OutputStream outStream, String dirName, String[] fileList) throws ZipFileException
	{
		init(outStream, dirName);
		createItemList(fileList);
	}

	/**
	 * Exclude any files that are under these directories.
	 * E.g. suppose you have C:/temp/x1, C:/temp/x2 and C:/temp/x3 
	 * and the root is set to c:temp.  Thhen to exclude the contents of the second 
	 * 2 dirs you would send in a String array with "x2" and "x3"
	 * @param dirs an array of top-level directory names
	 */

	public void excludeDirs(String[] dirs)
	{
		// make sure the names all end with "/"
		for(int i = 0; i < dirs.length; i++)
		{
			if(!dirs[i].endsWith("/"))
				dirs[i] += "/";
		}
		
		// copy all the items we will retain into list
		List list = new ArrayList(items.length);
		
		for(int i = 0; i < items.length; i++)
		{
			for(int j = 0; j < dirs.length; j++)
			{
				if(!items[i].name.startsWith(dirs[j]))
					list.add(items[i]);
				//else
					//System.out.println("REMOVING: " + items[i].name);
			}
		}
		
		// reset items to the pruned list
		if(list.size() != items.length)
		{
			items = new ZipItem[list.size()];
			items = (ZipItem[])list.toArray(items);
		}
	}

	//////////////////////////////////////////////////////////////////////////////////////////////////////////////

	private void init(String outFileName, String dirName) throws ZipFileException
	{
		try
		{
			init(new FileOutputStream(outFileName), dirName);
		}
		catch(Exception e)
		{
			throw new ZipFileException(e);
		}
	}

	//////////////////////////////////////////////////////////////////////////////////////////////////////////////

	private void init(OutputStream outStream, String dirName) throws ZipFileException
	{
		try
		{
			//make sure it's really a directory
			File f = new File(dirName);
			
			// change the filename to be full-path & UNIX style
			dirName = FileUtils.safeGetCanonicalPath(f);
			dirName = dirName.replace('\\', '/');	// all UNIX-style filenames...
			
			
			// we need the dirname to end in a '/'
			if(!dirName.endsWith("/"))
				dirName += "/";

			
			this.dirName		= dirName;
			zipStream			= new ZipOutputStream(outStream);
		}
		catch(Throwable t)
		{
			throw new ZipFileException(t);
		}
	}

	//////////////////////////////////////////////////////////////////////////////////////////////////////////////

    /**
     * Does not throw an exception when there is a duplicate zip entry.
     *
     * @throws  ZipFileException   if an error while creating the archive
     */
	public void safeWrite()  throws ZipFileException
	{
		try
		{
			for(int i = 0; i < items.length; i++)
			{
                try 
                {
                    addEntry(items[i]);
                } 
                catch (ZipException e) 
                {
                    // ignore - duplicate zip entry
                }
			}
			
			zipStream.close();
		}
		catch(ZipFileException z)
		{
			throw z;
		}
		catch(Exception e)
		{
			throw new ZipFileException(e);
		}
	}

	//////////////////////////////////////////////////////////////////////////////////////////////////////////////
	
	public void write()  throws ZipFileException
	{
		try
		{
			for(int i = 0; i < items.length; i++)
			{
				addEntry(items[i]);
			}
			
			zipStream.close();
		}
		catch(ZipFileException z)
		{
			throw z;
		}
		catch(Exception e)
		{
			throw new ZipFileException(e);
		}
	}

	//////////////////////////////////////////////////////////////////////////////////////////////////////////////
	
	private void addEntry(ZipItem item)  throws ZipFileException, IOException
	{
		int					totalBytes	= 0;
		ZipEntry			ze			= new ZipEntry(item.name);
		
		zipStream.putNextEntry(ze);
		
		// bnevins -- don't try to "read" from a directory file.
		// Any item.name that ends in "/" must be an empty directory, or it wouldn't be here!
		// important:  if you look inside the zip file with WinZip you
		// won't see empty directories.  But they are there -- and they will 
		// get extracted!
		if(!item.name.endsWith("/"))
		{
			FileInputStream		in			= new FileInputStream(item.file);

			for(int numBytes = in.read(buffer); numBytes > 0; numBytes = in.read(buffer))
			{
				zipStream.write(buffer, 0, numBytes);
				totalBytes += numBytes;
			}
			
			in.close();
		}
		zipStream.closeEntry();
	}		

	//////////////////////////////////////////////////////////////////////////////////////////////////////////////
	
	private void createItemList(String[] files) throws ZipFileException
	{
		try
		{
			if(files == null)
			{
				FileListerRelative lister = new FileListerRelative(new File(dirName));
				files = lister.getFiles();
			}

			if(files.length <= 0)
				throw new ZipFileException("No files to add!");

			items = new ZipItem[files.length];

			for(int i = 0; i < files.length; i++)
			{
				File f = new File(dirName + files[i]);
				items[i] = new ZipItem(f, files[i].replace('\\', '/'));	// just in case...
				
				// bnevins -- add a trailing "/" to empty directories
				if(f.isDirectory())
					items[i].name += "/";
			}
		}
		catch(Throwable t)
		{
			throw new ZipFileException(t);
		}
			
	}

	//////////////////////////////////////////////////////////////////////////////////////////////////////////////
	
	String getDirName()
	{
		return dirName;
	}
		
	//////////////////////////////////////////////////////////////////////////////////////////////////////////////
	
	private static void usage()
	{
		System.out.println("usage: java com.elf.util.zip.ZipWriter zip-filename directory-name");
		System.exit(1);
	}
		
	//////////////////////////////////////////////////////////////////////////////////////////////////////////////
	
	public static void main(String[] args)
	{
		
		if(args == null || args.length != 2)
			usage();
		
		try
		{
			ZipWriter zw = new ZipWriter(args[0], args[1]);
			zw.write();
		}
		catch(ZipFileException e)
		{
			System.exit(0);
		}
	}

	/////////////////////////////////////////////////////////////////////////////////////////

	//private					String			zipFilename		= null;
	private					String			dirName			= null;
	private					ZipOutputStream zipStream		= null;
	private					byte[]			buffer			= new byte[16384];
	private					ZipItem[]		items			= null;
}
