/*

 * Copyright 2004 Grzegorz Grasza groz@gryf.info

 * 

 * This file is part of mobber. Mobber is free software; you can redistribute it

 * and/or modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation; either version 2 of the License,

 * or (at your option) any later version. Mobber is distributed in the hope that

 * it will be useful, but WITHOUT ANY WARRANTY; without even the implied

 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

 * General Public License for more details. You should have received a copy of

 * the GNU General Public License along with mobber; if not, write to the Free

 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307

 * USA .

 */



package net.sourceforge.jxa;



import java.io.*;

import java.util.*;



/**

 * XML-Reader

 * 

 * @author Grzegorz Grasza

 * @version 1.0

 * @since 1.0

 */

public class XmlReader {	

	private InputStream is;



	public final static int START_DOCUMENT = 0;



	public final static int END_DOCUMENT = 1;



	public final static int START_TAG = 2;



	public final static int END_TAG = 3;



	public final static int TEXT = 4;



	private Stack tags;



	private boolean inside_tag;



	private String tagName;



	private String text;



	private final Hashtable attributes = new Hashtable();



	private int c;



	private int type = START_DOCUMENT;



	//public XmlReader(final InputStream in) throws IOException, UnsupportedEncodingException {

	public XmlReader(final InputStream in) throws IOException {

		//reader = new InputStreamReader(in, "UTF-8");

		this.is = in;

		this.tags = new Stack();

		this.inside_tag = false;

	}

	

	//http://discussion.forum.nokia.com/forum/showthread.php?t=76814

	//by abirr

	private int getNextCharacter() throws IOException {

		int a = is.read();

		int t=a;



		if((t|0xC0)==t){

		int b = is.read();

		if( b == 0xFF ){ // Check if legal

		t=-1;

		}else if( b < 0x80 ){ // Check for UTF8 compliancy

		throw new IOException("Bad UTF-8 Encoding encountered");

		}else if((t|0xE0)==t) {

		int c = is.read();

		if( c == 0xFF ){ // Check if legal

		t=-1;

		}else if( c < 0x80 ){ // Check for UTF8 compliancy

		throw new IOException("Bad UTF-8 Encoding encountered");

		}else

		t=((a & 0x0F)<<12) | ((b & 0x3F)<<6) | (c & 0x3F);

		}else

		t=((a & 0x1F)<<6)|(b&0x3F);

		}

		return t;

	}

	

	public void close() {

		/*try {

			reader.close();

		} catch (IOException e) {}*/

	}



	public int next() throws IOException {

/*		while (!this.ready())

			try { 

				java.lang.Thread.sleep(100);

			} catch (InterruptedException e) {}*/

		this.c = getNextCharacter();

		if (this.c <= ' ') {

			while (((this.c = getNextCharacter()) <= ' ') && (this.c != -1)) {

				;

			}

		}

		if (this.c == -1) {

			this.type = END_DOCUMENT;

			return this.type;

		}



		if ((this.c == '<') || ((this.c == '/') && !this.inside_tag)) {

			this.inside_tag = true;

			// reset all

			this.tagName = null;

			this.text = null;

			this.attributes.clear();



			if (this.c == '<') {

				this.c = getNextCharacter();

			}

			if (this.c == '/') {

				this.type = END_TAG;

				this.c = getNextCharacter();

				this.tagName = this.readName('>');

			} else if ((this.c == '?') || (this.c == '!')) {// ignore xml heading & // comments 

				while ((this.c = getNextCharacter()) != '>') {

					;

				}

				this.next();

			} else {

				this.type = START_TAG;

				this.tagName = this.readName(' ');



				String attribute = "";

				String value = "";

				while (this.c == ' ') {

					this.c = getNextCharacter();

					attribute = this.readName('=');



					int quote = getNextCharacter();//this.c = this.read(); // '''

					this.c = getNextCharacter();

					value = this.readText(quote); //change from value = this.readText(''');

					this.c = getNextCharacter();

					this.attributes.put(attribute, value);

				}

				if (this.c != '/') {

					this.inside_tag = false;

				}

			}

		} else if ((this.c == '>') && this.inside_tag) // last tag ended

		{

			this.type = END_TAG;

			this.inside_tag = false;

		} else {

			this.tagName = null;

			this.attributes.clear();



			this.type = TEXT;

			this.text = this.readText('<');

		}



		return this.type;

	}



	public int getType() {

		return this.type;

	}



	public String getName() {

		return this.tagName;

	}



	public String getAttribute(final String name) {

		return (String) this.attributes.get(name);

	}



	public Enumeration getAttributes() {

		return this.attributes.keys();

	}



	public String getText() {

		return this.text;

	}



	private String readText(final int end) throws IOException {

		final StringBuffer output = new StringBuffer("");

		while (this.c != end) {

			if (this.c == '&') {

				this.c = getNextCharacter();

				switch (this.c) {

					case 'l':

						output.append('<');

						break;

					case 'g':

						output.append('>');

						break;

					case 'a':

						if (getNextCharacter() == 'm') {

							output.append('&');

						} else {

							output.append('\'');

						}

						break;

					case 'q':

						output.append('"');

						break;

					case 'n':

						output.append(' ');

						break;

					default:

						output.append('?');

				}



				while ((this.c = getNextCharacter()) != ';') {

					;

				}

			} else if (this.c == '\\') {

				if ((this.c = getNextCharacter()) == '<') {

					break;

				} else {

					output.append((char) this.c);

				}

			} else {

				output.append((char) this.c);

			}

			this.c = getNextCharacter();

		}

		// while((c = read()) != end);

		return output.toString();

	}



	private String readName(final int end) throws IOException {

		final StringBuffer output = new StringBuffer("");

		do {

			output.append((char) this.c);

		} while (((this.c = getNextCharacter()) != end) && (this.c != '>') && (this.c != '/'));

		return output.toString();

	}

};