Attributes.java

/*
 * Copyright 2005-2010 Ignis Software Tools Ltd. All rights reserved.
 */
package jsystem.extensions.report.html.summary;

import java.util.LinkedList;
import java.util.ListIterator;

public class Attributes extends LinkedList<Object> {

	/**
	 * 
	 */
	private static final long serialVersionUID = -6049526357736518817L;

	public Attributes() {
		super();
	}

	public Attributes(String attr) throws IllegalArgumentException {
		super();
		setAttributes(attr);
	}

	public Attributes(Attribute[] attrs) {
		super();
		for (int i = 0; i < attrs.length; i++) {
			add(attrs[i]);
		}
	}

	public Attributes(Attribute attr) {
		super();
		add(attr);
	}

	/**
	 * Set the value of attributes.
	 * 
	 * @param str
	 *            String with HTML attributes like: border="0" cellpadding="0"
	 *            cellspacing="0"
	 */

	public void setAttributes(String str) throws IllegalArgumentException {
		Attribute attribute = new Attribute();
		final int START = 0;
		// final int EOL = 1;
		final int ERR = -1;
		final int Attr = 2;
		final int Val0 = 3;
		final int Val1 = 4;
		final int Value = 5;
		final int QVal = 6;
		// finite state machine for parsing
		int state = START;
		int prev = -1; // debug
		int i = 0;
		StringBuffer token = new StringBuffer();

		while ((i <= str.length()) && (state != ERR)) {
			char chr;
			if (i < str.length())
				chr = str.charAt(i);
			else
				chr = ' ';
			i++;
			prev = state;
			switch (state) {
			case START:
				switch (chr) {
				case ' ':
					break;
				case '"':
				case '=':
					state = ERR;
					break;
				default:
					token.append(chr);
					state = Attr;
				}
				break;
			case Attr:
				switch (chr) {
				case ' ':
					attribute = new Attribute(token.toString());
					state = Val0;
					break;
				case '=':
					attribute = new Attribute(token.toString());
					state = Val1;
					break;
				case '"':
					state = ERR;
					break;
				default:
					token.append(chr);
				}
				break;
			case Val0:
				switch (chr) {
				case '=':
					state = Val1;
					break;
				case ' ':
					break;
				default:
					this.add(attribute);
					token = new StringBuffer();
					token.append(chr);
					state = Attr;
				}
				break;
			case Val1:
				token = new StringBuffer();
				switch (chr) {
				case '"':
					state = QVal;
					break;
				case '=':
					state = ERR;
					break;
				case ' ':
					break;
				default:
					token.append(chr);
					state = Value;
					break;
				}
				break;
			case Value:
				switch (chr) {
				case ' ':
					attribute.setValue(token.toString());
					this.add(attribute);
					token = new StringBuffer();
					state = START;
					break;
				case '=':
					state = ERR;
					break;
				default:
					token.append(chr);
				}
				break;
			case QVal:
				switch (chr) {
				case '"':
					attribute.setValue(token.toString());
					this.add(attribute);
					token = new StringBuffer();
					state = START;
					break;
				default:
					token.append(chr);
				}
				break;
			}
		}
		if ((i <= str.length()) || (state == ERR)) {
			System.err.println("Parse error:");
			System.err.println(str);
			for (int j = 0; j < i; j++)
				System.err.print(' ');
			System.err.println('^');
			throw new IllegalArgumentException("Parse error in state " + Integer.toString(prev));
		}
	}

	public String toString() {
		StringBuffer out = new StringBuffer(" ");
		ListIterator<Object> iterator = this.listIterator();
		while (iterator.hasNext()) {
			out.append(iterator.next().toString());
			out.append(' ');
		}
		out.deleteCharAt(out.length() - 1);
		return out.toString();
	}
}