// **********************************************************************
//
// Copyright (c) 2003-2007 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
package IceGridGUI;

import java.io.*;

//
// Helper class to write XML files
//
public class XMLWriter
{
    public XMLWriter(File file) throws FileNotFoundException, IOException
    {
	try
	{
	    _writer = new BufferedWriter(
		new OutputStreamWriter(new FileOutputStream(file), "UTF-8"));
	}
	catch(UnsupportedEncodingException e)
	{
	    assert false;
	}
	_writer.write("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>" + _newline);
	_writer.write("<!-- This file was written by IceGrid Admin -->" + _newline);
    }

    public void writeElement(String name, java.util.List attributes)
	throws IOException
    {
	_writer.write(_indent);
	_writer.write("<" + name);
	writeAttributes(attributes);
	_writer.write("/>" + _newline);
    }

    public void writeElement(String name) throws IOException
    {
	writeElement(name, (java.util.List)null);
    }

    public void writeElement(String name, String content) throws IOException
    {
	_writer.write(_indent);
	_writer.write("<" + name + ">" + escape(content) + 
		      "</" + name + ">" + _newline);
    }

    public void writeStartTag(String name, java.util.List attributes)
	throws IOException
    {
	_writer.write(_indent);
	_writer.write("<" + name);
	writeAttributes(attributes);
	_writer.write(">");
	_writer.write(_newline);
	increaseIndent();
    }

    public void writeStartTag(String name) throws IOException
    {
	writeStartTag(name, null);
    }

    public void writeEndTag(String name) throws IOException
    {
	decreaseIndent();
	_writer.write(_indent);
	_writer.write("</" + name + ">" + _newline);
    }

    public void close()  throws IOException
    {
	_writer.close();
    }

    public void flush() throws IOException
    {
	_writer.flush();
    }

    private void writeAttributes(java.util.List attributes)
	throws IOException
    {
	if(attributes != null)
	{
	    java.util.Iterator p = attributes.iterator();
	    while(p.hasNext())
	    {
		String[] pair = (String[])p.next();
		_writer.write(" " + pair[0] + "=\"" + pair[1] + "\"");
	    }
	}
    }

    private void increaseIndent()
    {
	_indent += "   ";
    }

    private void decreaseIndent()
    {
	if(_indent.length() > 0)
	{
	    _indent = _indent.substring(3);
	}
    }

    private String
    escape(String input)
    {
        String v = input;

        //
        // Find out whether there is a reserved character to avoid
        // conversion if not necessary.
        //
        final String allReserved = "<>'\"&";
        boolean hasReserved = false;
        char[] arr = input.toCharArray();
        for(int i = 0; i < arr.length; i++)
        {
            if(allReserved.indexOf(arr[i]) != -1)
            {
                hasReserved = true;
                break;
            }
        }
        if(hasReserved)
        {
            //
            // First convert all & to &amp;
            //
            if(v.indexOf('&') != -1)
            {
                v = v.replaceAll("&", "&amp;");
            }

            //
            // Next convert remaining reserved characters.
            //
            if(v.indexOf('>') != -1)
            {
                v = v.replaceAll(">", "&gt;");
            }
            if(v.indexOf('<') != -1)
            {
                v = v.replaceAll("<", "&lt;");
            }
            if(v.indexOf('\'') != -1)
            {
                v = v.replaceAll("'", "&apos;");
            }
            if(v.indexOf('"') != -1)
            {
                v = v.replaceAll("\"", "&quot;");
            }
        }
        return v;
    }


    private Writer _writer;
    private String _indent = "";
    private static String _newline = System.getProperty("line.separator");
}