State.java

/*
 *  Author:  Chris Seguin
 *
 *  This software has been developed under the copyleft
 *  rules of the GNU General Public License.  Please
 *  consult the GNU General Public License for more
 *  details about use and distribution of this software.
 */
package org.acm.seguin.print.xml;

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;

/**
 *  State pattern that is used to print the XML file
 *
 *@author    Chris Seguin
 */
public abstract class State {
	/**
	 *  the font
	 */
	protected Font font;
	protected Color color;
	private Graphics g;
	private int x;
	private int y;
	private int fontSize;


	/**
	 *  Constructor for the State object
	 */
	public State() {
		font = null;
		fontSize = -1;
		color = Color.black;
	}


	/**
	 *  Sets the FontSize attribute of the State object
	 *
	 *@param  value  The new FontSize value
	 */
	public void setFontSize(int value) {
		if (value != fontSize) {
			fontSize = value;
			font = null;
		}
	}


	/**
	 *  Sets the Graphics attribute of the State object
	 *
	 *@param  value  The new Graphics value
	 */
	public void setGraphics(Graphics value) {
		g = value;
	}


	/**
	 *  Sets the X attribute of the State object
	 *
	 *@param  value  The new X value
	 */
	public void setX(int value) {
		x = value;
	}


	/**
	 *  Sets the Y attribute of the State object
	 *
	 *@param  value  The new Y value
	 */
	public void setY(int value) {
		y = value;
	}


	/**
	 *  Gets the FontSize attribute of the State object
	 *
	 *@return    The FontSize value
	 */
	public int getFontSize() {
		return fontSize;
	}


	/**
	 *  Gets the Font attribute of the State object
	 *
	 *@return    The Font value
	 */
	public abstract Font getFont();


	/**
	 *  Gets the Graphics attribute of the State object
	 *
	 *@return    The Graphics value
	 */
	public Graphics getGraphics() {
		return g;
	}


	/**
	 *  Gets the X attribute of the State object
	 *
	 *@return    The X value
	 */
	public int getX() {
		return x;
	}


	/**
	 *  Gets the Y attribute of the State object
	 *
	 *@return    The Y value
	 */
	public int getY() {
		return y;
	}


	/**
	 *  Processes a single line and returns the state that is in effect at the
	 *  end of the line.
	 *
	 *@param  line  the line
	 *@return       the state
	 */
	public State processLine(String line) {
		return processLine(line, 0, new StringBuffer());
	}


	/**
	 *  The actual worker method that processes the line. This is what is defined
	 *  by the various states
	 *
	 *@param  line   the line
	 *@param  index  the index of the character
	 *@param  buf    the buffer
	 *@return        the state at the end of the line
	 */
	protected abstract State processLine(String line, int index,
			StringBuffer buf);


	/**
	 *  Set the state for the next state
	 *
	 *@param  next  the next state
	 */
	protected void initState(State next) {
		next.setGraphics(getGraphics());
		next.setX(getX());
		next.setY(getY());
		next.setFontSize(getFontSize());
	}


	/**
	 *  Prints the buffer
	 *
	 *@param  buf  the buffer
	 */
	protected void print(StringBuffer buf) {
		String out = buf.toString();
		if (out.length() == 0) {
			return;
		}

		//System.out.println("Printing:  [" + out + "] (" + getClass().getName() + ") " + fontSize + "(" + x + ", " + y +")");
		//font = new Font("Monospaced", Font.PLAIN, fontSize);
		g.setFont(getFont());
		g.setColor(color);
		g.drawString(out, x, y);

		FontMetrics fm = g.getFontMetrics();
		x = x + fm.stringWidth(out);
	}
}