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// ========================================================================
// $Id: Include.java,v 1.6 2005/08/13 00:01:23 gregwilkins Exp $
// Copyright 1996-2004 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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 org.mortbay.html;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.net.URL;

import org.mortbay.util.IO;


/* -------------------------------------------------------------------- */
/** Include File, InputStream or Reader Element.
 * This Element includes another file.
 * This class expects that the HTTP directory separator '/' will be used.
 * This will be converted to the local directory separator.
 * @see Element
 * @version $Id: Include.java,v 1.6 2005/08/13 00:01:23 gregwilkins Exp $
 * @author Greg Wilkins
*/
public class Include extends Element
{

    Reader reader=null;
    
    /* ------------------------------------------------------------ */
    /** Constructor.
     * Include file
     * @param directory Directory name
     * @param fileName file name
     * @exception IOException File not found
     */
    public Include(String directory,
                   String fileName)
         throws IOException
    {
        if (directory==null)
            directory=".";
 
        if (File.separatorChar != '/')
        {
            directory = directory.replace('/',File.separatorChar);
            fileName  = fileName .replace('/',File.separatorChar);
        }

        includeFile(new File(directory,fileName));
    }
    
    /* ------------------------------------------------------------ */
    /** Constructor. 
     * Include file.
     * @param fileName Filename
     * @exception IOException File not found
     */
    public Include(String fileName)
        throws IOException
    {
        if (File.separatorChar != '/')
            fileName  = fileName .replace('/',File.separatorChar);
        includeFile(new File(fileName));
    }

    /* ------------------------------------------------------------ */
    /** Constructor.
     * Include file.
     * @param file file
     * @exception IOException File not found
     */
    public Include(File file)
        throws IOException
    {
        includeFile(file);
    }

    /* ------------------------------------------------------------ */
    /** Constructor.
     * Include InputStream.
     * Byte to character transformation is done assuming the default
     * local character set.  What this means is that on EBCDIC systems
     * the included file is assumed to be in EBCDIC.
     * @param in stream
     * @exception IOException
     */
    public Include(InputStream in)
        throws IOException
    {
        if (in!=null)
            reader=new InputStreamReader(in);
    }
    
    /* ------------------------------------------------------------ */
    /** Constructor.
     * Include contents of a URL.
     * Byte to character transformation is done assuming the default
     * local character set.  What this means is that on EBCDIC systems
     * the included file is assumed to be in EBCDIC.
     * @param url the URL to read from.
     * @exception IOException
     */
    public Include(URL url)
        throws IOException
    {
        if (url!=null)
            reader=new InputStreamReader(url.openStream());
    }
    
    /* ------------------------------------------------------------ */
    /** Constructor.
     * Include Reader.
     * @param in reader
     * @exception IOException
     */
    public Include(Reader in)
        throws IOException
    {
        reader=in;
    }
    
    /* ------------------------------------------------------------ */
    private void includeFile(File file)
        throws IOException
    {
        if (!file.exists())
            throw new FileNotFoundException(file.toString());
        
        if (file.isDirectory())
        {
            List list = new List(List.Unordered);       
            String[] ls = file.list();
            for (int i=0 ; i< ls.length ; i++)
                list.add(ls[i]);
            StringWriter sw = new StringWriter();
            list.write(sw);
            reader = new StringReader(sw.toString());
        }
        else
        {
            reader = new BufferedReader(new FileReader(file));
        }
    }
    

    /* ---------------------------------------------------------------- */
    public void write(Writer out)
         throws IOException
    {
        if (reader==null)
            return;
        
        try{
            IO.copy(reader,out);
        }
        finally
        {
            reader.close();
            reader=null;
        }
    }
}