carfield.com.hk

R-intro.pdf

2009-05-22T17:20:00Z

genetic algorithms book.pdf

2009-03-21T10:42:00Z

AbstractGraphSearch.java

2002-01-20T16:00:00Z

import java.util.Vector;

abstract public class AbstractGraphSearch {

public void addNode(String name, int x, int y) {
	System.out.println("Adding node: " + name + ", " + x + ", " + y);
	nodeNames[numNodes] = name;
	node_x[numNodes] = x;
	node_y[numNodes] = y;
	numNodes++;
    }

public int getNumNodes() { return numNodes; }
    public int getNumLinks() { return numLinks; }

public String getNodeName(int index) {
	try {
	    return nodeNames[index];
	} catch (Exception e) {
	    System.out.println("Error in getNodeName: " + e);
	}
	return "no name"; // error condition
    }

public int getNodeX(int index) {
	try {
	    return node_x[index];
	} catch (Exception e) {
	    System.out.println("Error in getNodePosition: " + e);
	}
	return 0;  // error condition
    }

public int getNodeY(int index) {
	try {
	    return node_y[index];
	} catch (Exception e) {
	    System.out.println("Error in getNodePosition: " + e);
	}
	return 0;  // error condition
    }

public int getLink1(int index) {
      return link_1[index];
    }

public int getLink2(int index) {
      return link_2[index];
    }

public void addLink(int node1, int node2) {
	link_1[numLinks] = node1;
	link_2[numLinks] = node2;
	int dist_squared =
	    (node_x[node1] - node_x[node2]) * (node_x[node1] - node_x[node2]) +
	    (node_y[node1] - node_y[node2]) * (node_y[node1] - node_y[node2]);
	lengths[numLinks] = (int)Math.sqrt(dist_squared);
	numLinks++;
    }

public void addLink(String name1, String name2) {
	int index1 = -1, index2 = -1;
	for (int i=0; i<numNodes; i++) {
	 if (name1.equals(nodeNames[i])) index1 = i;
	 if (name2.equals(nodeNames[i])) index2 = i;
	}
	if (index1 != -1 && index2 != -1) addLink(index1, index2);
 }

/** findPath - abstract method that is defined in subclasses */
    abstract public int [] findPath(int start_node, int goal_node); // return an array of node indices

protected int getNodeIndex(String name) {
	for (int i=0; i<numNodes; i++) {
	 if (name.equals(nodeNames[i])) return i;
	}
	return -1; // error condition
 }

final public static int MAX = 50; // max number of nodes and max number of links

protected int [] path = new int[AbstractGraphSearch.MAX];
    protected int num_path = 0;

// for nodes:
    protected String [] nodeNames = new String[MAX];
    protected int [] node_x = new int[MAX];
    protected int [] node_y = new int[MAX];
    // for links between nodes:
    protected int [] link_1 = new int[MAX];
    protected int [] link_2 = new int[MAX];
    protected int [] lengths = new int[MAX];

protected int numNodes = 0;
    protected int numLinks = 0;

protected int goalNodeIndex = -1, startNodeIndex = -1;

}

BreadthFirstSearch.java

2002-01-20T16:00:00Z

public class BreadthFirstSearch extends AbstractGraphSearch {

/** findPath - abstract method in super class */
    public int [] findPath(int start_node, int goal_node) { // return an array of node indices
	System.out.println("Entered BreadthFirstSearch.findPath(" +
			   start_node + ", " + goal_node + ")");
	// data structures for depth first search:
	boolean [] alreadyVisitedFlag = new boolean[numNodes];
	int [] predecessor = new int[numNodes];
	IntQueue queue = new IntQueue(numNodes + 2);

for (int i=0; i<numNodes; i++) {
	 alreadyVisitedFlag[i] = false;
	 predecessor[i] = -1;
	}

alreadyVisitedFlag[start_node] = true;
	queue.addToBackOfQueue(start_node);
outer:	while (queue.isEmpty() == false) {
	 int head = queue.peekAtFrontOfQueue();
	 int [] connected = connected_nodes(head);
	 if (connected != null) {
		for (int i=0; i<connected.length; i++) {
		 if (alreadyVisitedFlag[connected[i]] == false) {
			predecessor[connected[i]] = head;
			queue.addToBackOfQueue(connected[i]);
			if (connected[i] == goal_node) break outer; // we are done
		 }
		}
		alreadyVisitedFlag[head] = true;
		queue.removeFromQueue(); // ignore return value
	 }
	}
	// now calculate the shortest path from the predecessor array:
	int [] ret = new int[numNodes + 1];
	int count = 0;
	ret[count++] = goal_node;
	for (int i=0; i<numNodes; i++) {
	 ret[count] = predecessor[ret[count - 1]];
	 count++;
	 if (ret[count - 1] == start_node) break; // back to starting node
	}
	int [] ret2 = new int[count];
	for (int i=0; i<count; i++) {
	 ret2[i] = ret[count - 1 - i];
	}
	return ret2;
 }

protected class IntQueue {
	public IntQueue(int num) {
	    queue = new int[num];
	    head = tail = 0;
	    len = num;
	}
	public IntQueue() {
	    this(400);
	}
	private int [] queue;
	int tail, head, len;
	public void addToBackOfQueue(int n) {
	    queue[tail] = n;
	    if (tail >= (len - 1)) {
		tail = 0;
	    } else {
		tail++;
	    }
	}
	public int removeFromQueue() {
	    int ret = queue[head];
	    if (head >= (len - 1)) {
		head = 0;
	    } else {
		head++;
	    }
	    return ret;
	}
	public boolean isEmpty() {
	    return head == (tail + 1);
	}
	public int peekAtFrontOfQueue() {
	    return queue[head];
	}
    }

protected int [] connected_nodes(int node) {
	int [] ret = new int[AbstractGraphSearch.MAX];
	int num = 0;

for (int n=0; n<numNodes; n++) {
	 boolean connected = false;
	 // See if there is a link between node 'node' and 'n':
	 for (int i=0; i<numLinks; i++) {
		if (link_1[i] == node) {
		 if (link_2[i] == n) {
			connected = true;
			break;
		 }
		}
		if (link_2[i] == node) {
		 if (link_1[i] == n) {
			connected = true;
			break;
		 }
		}
	 }
	 if (connected) {
		ret[num++] = n;
	 }
	}
	if (num == 0) return null;
	int [] ret2 = new int[num];
	for (int i=0; i<num; i++) {
	 ret2[i] = ret[i];
	}
	return ret2;
 }

}

DepthFirstSearch.java

2002-01-20T16:00:00Z

public class DepthFirstSearch extends AbstractGraphSearch {

/** findPath - abstract method in super class */
    public int [] findPath(int start_node, int goal_node) { // return an array of node indices
        System.out.println("Entered DepthFirstSearch.findPath(" +
                           start_node + ", " + goal_node + ")");
        path[0] = start_node;
        return findPathHelper(path, 1, goal_node);
    }

public int [] findPathHelper(int [] path, int num_path, int goal_node) {
 System.out.println("Entered DepthFirstSearch.findPathHelper(...," +
 num_path + ", " + goal_node + ")");
 if (goal_node == path[num_path - 1]) {
 int [] ret = new int[num_path];
 for (int i=0; i<num_path; i++) ret[i] = path[i];
 return ret; // we are done!
 }
 int [] new_nodes = connected_nodes(path, num_path);
 if (new_nodes != null) {
 for (int j=0; j<new_nodes.length; j++) {
 path[num_path] = new_nodes[j];
 int [] test = findPathHelper(path, num_path + 1, goal_node);
 if (test != null) {
 if (test[test.length - 1] == goal_node) {
 return test;
 }
 }
 }
 }
 return null;
 }

protected int [] connected_nodes(int [] path, int num_path) {
 // find all nodes connected to the last node on 'path'
 // that are not already on 'path'
 int [] ret = new int[AbstractGraphSearch.MAX];
 int num = 0;
 int last_node = path[num_path - 1];
 for (int n=0; n<numNodes; n++) {
 // see if node 'n' is already on 'path':
 boolean keep = true;
 for (int i=0; i<num_path; i++) {
 if (n == path[i]) {
 keep = false;
 break;
 }
 }
 boolean connected = false;
 if (keep) {
 // now see if there is a link between node 'last_node' and 'n':
 for (int i=0; i<numLinks; i++) {
 if (link_1[i] == last_node) {
 if (link_2[i] == n) {
 connected = true;
 break;
 }
 }
 if (link_2[i] == last_node) {
 if (link_1[i] == n) {
 connected = true;
 break;
 }
 }
 }
 if (connected) {
 ret[num++] = n;
 }
 }
 }
 if (num == 0) return null;
 int [] ret2 = new int[num];
 for (int i=0; i<num; i++) {
 ret2[i] = ret[i];
 }
 return ret2;
 }

}

GraphBreadthFirstSearch.java

2002-01-20T16:00:00Z

import javax.swing.*;
import java.awt.*;

public class GraphBreadthFirstSearch extends JFrame {
  JPanel jPanel1 = new JPanel();

public GraphBreadthFirstSearch() {
    BreadthFirstSearch engine = new BreadthFirstSearch();
	  // Define a test network before calling the super class 'init':
	  engine.addNode("0", 20, 40);
	  engine.addNode("1", 60, 60);
	  engine.addNode("2", 100, 40);
	  engine.addNode("3", 50, 110);
	  engine.addNode("4", 140, 80);
	  engine.addNode("5", 160, 150);
	  engine.addNode("6", 200, 80);
	  engine.addNode("7", 160, 40);
	  engine.addNode("8", 240, 120);
	  engine.addNode("9", 260, 90);

engine.addLink(0,1);
	 engine.addLink(1,2);
	 engine.addLink(2,3);
	 engine.addLink(2,4);
	 engine.addLink(4,5);
	 engine.addLink(4,6);
	 engine.addLink(6,8);
	 engine.addLink(8,9);
	 engine.addLink(2,7);
	 engine.addLink(7,9);
 System.out.println("Before calculating path");
 path = engine.findPath(0, 9);
 System.out.println("After calculating path:");
 for (int i=0; i<path.length; i++) {
 System.out.println(" node # " + path[i]);
 }
 this.engine = engine;
 try {
 jbInit();
 }
 catch(Exception e) {
 e.printStackTrace();
 }
 }
 private int [] path = null;
 private BreadthFirstSearch engine = null;

public static void main(String[] args) {
    GraphBreadthFirstSearch graphBreadthFirstSearch1 = new GraphBreadthFirstSearch();
  }

private void jbInit() throws Exception {
    this.setDefaultCloseOperation(3);
    jPanel1.setBackground(Color.white);
    this.getContentPane().add(jPanel1, BorderLayout.CENTER);
    this.setSize(290, 180);
    this.setVisible(true);
  }
    protected void paintNode(Graphics g, String name, int x, int y) {
	int len = name.length() * 10 + 6;
	int x1 = x - (len / 2);
	int x2 = x + (len / 2);
	int y1 = y - 10;
	int y2 = y + 10;
	g.setColor(Color.cyan);
	g.fill3DRect(x1, y1, len, 20, true);
	g.setColor(Color.black);
	g.drawString(name, x1 + 4, y2 - 6);
    }

public void paint(Graphics g) {
	super.paint(g);
	if (engine != null && path != null) {
 int numNodes = engine.getNumNodes();
 int numLinks = engine.getNumLinks();
 for (int i=0; i<numLinks; i++) {
 int l1 = engine.getLink1(i);
 int l2 = engine.getLink2(i);
 int x1 = engine.getNodeX(l1);
 int y1 = engine.getNodeY(l1);
 int x2 = engine.getNodeX(l2);
 int y2 = engine.getNodeY(l2);
 g.setColor(Color.lightGray);
 g.drawLine(x1, y1, x2, y2);
 }
 for (int i=1; i<path.length; i++) {
 int x1 = engine.getNodeX(path[i-1]);
 int y1 = engine.getNodeY(path[i-1]);
 int x2 = engine.getNodeX(path[i]);
 int y2 = engine.getNodeY(path[i]);
 g.setColor(Color.black);
 g.drawLine(x1, y1, x2, y2);
 }
 for (int i=0; i<numNodes; i++) {
 int x1 = engine.getNodeX(i);
 int y1 = engine.getNodeY(i);
 paintNode(g, engine.getNodeName(i), x1, y1);
 }
 }
 }

}

GraphDepthFirstSearch.java

2002-01-20T16:00:00Z

import javax.swing.*;
import java.awt.*;

public class GraphDepthFirstSearch extends JFrame {
  JPanel jPanel1 = new JPanel();

public GraphDepthFirstSearch() {
    DepthFirstSearch engine = new DepthFirstSearch();
	  // Define a test network before calling the super class 'init':
	  engine.addNode("0", 20, 40);
	  engine.addNode("1", 60, 60);
	  engine.addNode("2", 100, 40);
	  engine.addNode("3", 50, 110);
	  engine.addNode("4", 140, 80);
	  engine.addNode("5", 160, 150);
	  engine.addNode("6", 200, 80);
	  engine.addNode("7", 160, 40);
	  engine.addNode("8", 240, 120);
	  engine.addNode("9", 260, 90);

public static void main(String[] args) {
    GraphDepthFirstSearch graphDepthFirstSearch1 = new GraphDepthFirstSearch();
  }

}

Practical_AI_in_Java.pdf

2002-01-20T16:00:00Z

Maze.java

2002-01-19T16:00:00Z

import java.awt.Dimension;

/**
 * Class Maze - private class for representing search space as a two-dimensional maze
 */
public class Maze {
 public static short OBSTICLE = -1;
 public static short START_LOC_VALUE = -2;
 public static short GOAL_LOC_VALUE = -3;
 private int width = 0;
 private int height = 0;
 public Dimension startLoc = new Dimension();
 public Dimension goalLoc = new Dimension();
 /**
 * The maze (or search space) data is stored as a short integer rather than
 * as a boolean so that bread-first style searches can use the array to store
 * search depth. A value of -1 indicates a barrier in the maze.
 */
 private short [][]maze;
 public Maze(int width, int height) {
 System.out.println("New maze of size " + width + " by " + height);
 this.width = width;
 this.height = height;
 maze = new short[width+2][height+2];
 for (int i=0; i<width+2; i++) {
 for (int j=0; j<height+2; j++) {
 maze[i][j] = 0;
 }
 }
 for (int i=0; i<height+2; i++) {
 maze[0][i] = maze[width+1][i] = OBSTICLE;
 }
 for (int i=0; i<width+2; i++) {
 maze[i][0] = maze[i][height+1] = OBSTICLE;
 }
 /**
 * Randomize the maze by putting up arbitray obsticals
 */
 int max_obsticles = (width * height) / 3;
 for (int i=0; i<max_obsticles; i++) {
 int x = (int)(Math.random()*width);
 int y = (int)(Math.random()*height);
 setValue(x, y, OBSTICLE);
 }
 /**
 * Specify the starting location
 */
 startLoc.width = 0;
 startLoc.height = 0;
 setValue(0, 0, (short)0);
 /**
 * Specify the goal location
 */
 goalLoc.width = width - 1;
 goalLoc.height = height - 1;
 setValue(width - 1, height - 1, GOAL_LOC_VALUE);
 }
 synchronized public short getValue(int x, int y) { return maze[x+1][y+1]; }
 synchronized public void setValue(int x, int y, short value) { maze[x+1][y+1] = value; }
 public int getWidth() { return width; }
 public int getHeight() { return height; }
}

MazeBreadthFirstSearch.java

2002-01-19T16:00:00Z

import javax.swing.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
/**
 * Title: MazeBreadthFirstSearch
 * Description: Demo program for Java AI Programming
 * Copyright: Copyright (c) Mark Watson, Released under Open Source Artistic License
 * Company: Mark Watson Associates
 * @author Mark Watson
 * @version 1.0
 */

public class MazeBreadthFirstSearch extends javax.swing.JFrame {
    JPanel jPanel1 = new JPanel();
    BreadthFirstSearchEngine currentSearchEngine = null;

public MazeBreadthFirstSearch() {
        try {
          jbInit();
        } catch (Exception e) {
          System.out.println("GUI initilization error: " + e);
        }
        currentSearchEngine = new BreadthFirstSearchEngine(10, 10);
        repaint();
    }

public void paint(Graphics g_unused) {
 if (currentSearchEngine == null) return;
 Maze maze = currentSearchEngine.getMaze();
 int width = maze.getWidth();
 int height = maze.getHeight();
 System.out.println("Size of current maze: " + width + " by " + height);
 Graphics g = jPanel1.getGraphics();
 BufferedImage image = new BufferedImage(320, 320, BufferedImage.TYPE_INT_RGB);
 Graphics g2 = image.getGraphics();
 g2.setColor(Color.white);
 g2.fillRect(0, 0, 320, 320);
 g2.setColor(Color.black);
 for (int x=0; x<width; x++) {
 for (int y=0; y<height; y++) {
 short val = maze.getValue(x,y);
 if ( val == Maze.OBSTICLE) {
 g2.setColor(Color.lightGray);
 g2.fillRect(6 + x * 28, 3 + y * 29, 29, 30);
 } else if (val == Maze.START_LOC_VALUE || (x==0 && y==0)) {
 g2.setColor(Color.blue);
 g2.drawString("S", 16 + x * 28, 19 + y * 29);
 } else if (val == Maze.GOAL_LOC_VALUE) {
 g2.setColor(Color.red);
 g2.drawString("G", 16 + x * 28, 19 + y * 29);
 }
 }
 }
 // redraw the path in black:
 g2.setColor(Color.black);
 Dimension [] path = currentSearchEngine.getPath();
 for (int i=1; i< (path.length-1); i++) {
 int x = path[i].width;
 int y = path[i].height;
 short val = maze.getValue(x,y);
 g2.drawString("" + (path.length - i), 16 + x * 28, 19 + y * 29);
 }
 g.drawImage(image, 30, 40, 320, 320, null);

}

public static void main(String[] args) {
        MazeBreadthFirstSearch mazeSearch1 = new MazeBreadthFirstSearch();
    }

private void jbInit() throws Exception {

this.setContentPane(jPanel1);
        this.setCursor(null);
        this.setDefaultCloseOperation(3);
        this.setTitle("MazeBreadthFirstSearch");
        this.getContentPane().setLayout(null);
        jPanel1.setBackground(Color.white);
        jPanel1.setDebugGraphicsOptions(DebugGraphics.NONE_OPTION);
        jPanel1.setDoubleBuffered(false);
        jPanel1.setRequestFocusEnabled(false);
        jPanel1.setLayout(null);
        this.setSize(370, 420);
        this.setVisible(true);
    }
}

MazeDepthFirstSearch.java

2002-01-19T16:00:00Z

import javax.swing.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
/**
 * Title: MazeDepthFirstSearch
 * Description: Demo program for Java AI Programming
 * Copyright: Copyright (c) Mark Watson, Released under Open Source Artistic License
 * Company: Mark Watson Associates
 * @author Mark Watson
 * @version 1.0
 */

public class MazeDepthFirstSearch extends javax.swing.JFrame {
    JPanel jPanel1 = new JPanel();
    DepthFirstSearchEngine currentSearchEngine = null;

public MazeDepthFirstSearch() {
        try {
          jbInit();
        } catch (Exception e) {
          System.out.println("GUI initilization error: " + e);
        }
        currentSearchEngine = new DepthFirstSearchEngine(10, 10);
        repaint();
    }

public void paint(Graphics g_unused) {
 if (currentSearchEngine == null) return;
 Maze maze = currentSearchEngine.getMaze();
 int width = maze.getWidth();
 int height = maze.getHeight();
 System.out.println("Size of current maze: " + width + " by " + height);
 Graphics g = jPanel1.getGraphics();
 BufferedImage image = new BufferedImage(320, 320, BufferedImage.TYPE_INT_RGB);
 Graphics g2 = image.getGraphics();
 g2.setColor(Color.white);
 g2.fillRect(0, 0, 320, 320);
 g2.setColor(Color.black);
 for (int x=0; x<width; x++) {
 for (int y=0; y<height; y++) {
 short val = maze.getValue(x,y);
 if ( val == Maze.OBSTICLE) {
 g2.setColor(Color.lightGray);
 g2.fillRect(6 + x * 28, 3 + y * 29, 29, 30);
 } else if (val == Maze.START_LOC_VALUE || val == 1) {
 g2.setColor(Color.blue);
 g2.drawString("S", 16 + x * 28, 19 + y * 29);
 } else if (val == Maze.GOAL_LOC_VALUE) {
 g2.setColor(Color.red);
 g2.drawString("G", 16 + x * 28, 19 + y * 29);
 } else if (val > 0) {
 //g2.setColor(Color.green);
 //g2.drawString("" + val, 16 + x * 28, 19 + y * 29);
 }
 }
 }
 // redraw the path in black:
 g2.setColor(Color.black);
 Dimension [] path = currentSearchEngine.getPath();
 for (int i=1; i< path.length; i++) {
 int x = path[i].width;
 int y = path[i].height;
 short val = maze.getValue(x,y);
 g2.drawString("" + val, 16 + x * 28, 19 + y * 29);
 }
 g.drawImage(image, 30, 40, 320, 320, null);

}

public static void main(String[] args) {
        MazeDepthFirstSearch mazeSearch1 = new MazeDepthFirstSearch();
    }

private void jbInit() throws Exception {

this.setContentPane(jPanel1);
        this.setCursor(null);
        this.setDefaultCloseOperation(3);
        this.setTitle("MazeDepthFirstSearch");
        this.getContentPane().setLayout(null);
        jPanel1.setBackground(Color.white);
        jPanel1.setDebugGraphicsOptions(DebugGraphics.NONE_OPTION);
        jPanel1.setDoubleBuffered(false);
        jPanel1.setRequestFocusEnabled(false);
        jPanel1.setLayout(null);
        this.setSize(370, 420);
        this.setVisible(true);
    }
}

NLBean.java

2001-12-08T16:00:00Z

// mwa.products.NLBean.java
//
// Copyright 1997, Mark Watson.
//

package nlbean;
import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.text.*;
import java.util.*;
import java.beans.*;
import java.sql.*;
import java.util.Vector;

public class NLBean extends Panel implements Serializable {

 protected NLEngine engine = null;

 public NLBean() {
 super();
 reset();
 }

 private void writeObject(java.io.ObjectOutputStream s)
 throws java.io.IOException {
 System.out.println("Beginning writeObject");
 s.defaultWriteObject();
 System.out.println("Ending writeObject");
 }

 private void resetExamples() {
 choiceChanged = false;
 choice.removeAll();
 choice.addItem("Examples ");
 for (int i=(examples.length - 1); i>= 0; i--) {
 choice.insert(examples[i], 1);
 }
 }

 private void resetSynonyms() {
 engine.clearSynonyms();
 for (int i=0; i<synonyms.length; i++) {
 addSynonym(synonyms[i]);
 }
 }

 // Set up USER INTERFACE:

 private void reset() {
 engine = new NLEngine();
 AWTsetup();
 }

 private void AWTsetup() {
 Frame help_frame = new Frame();
 help = new Help(help_frame);

 setFont(new Font("Dialog", Font.PLAIN, 12));
 setLayout(null);

 Label l1 = new Label("Natural Language Database Access");
 l1.setFont(new Font("Dialog", Font.BOLD, 28));
 add(l1);
 l1.setBounds(2, 1, 600, 34);

 list1 = new java.awt.List(3, false);
 for (int i=0; i<databaseNames.length; i++) list1.add(databaseNames[i]);
 list2 = new java.awt.List(3, false);
 list3 = new java.awt.List(3, false);

 add(list1); add(list2); add(list3);
 list1.setBounds(2, 40, 220, 90);
 list2.setBounds(232, 40, 170, 90);
 list3.setBounds(412, 40, 170, 90);
 list1.addMouseListener(new MouseSelect1());
 list2.addMouseListener(new MouseSelect2());
 list3.addMouseListener(new MouseSelect3());

 Button q_button = new Button("Do query");
 q_button.addMouseListener(new MouseQuery());
 add(q_button); q_button.setBounds(2, 140, 160, 30);
 Button help_button = new Button("Help");
 help_button.addMouseListener(new MouseHelp());
 add(help_button); help_button.setBounds(172, 140, 40, 30);

 Label label22 = new Label("Query:");
 label22.setFont(new Font("Dialog", Font.BOLD, 14));
 add(label22); label22.setBounds(2, 180, 60, 22); label22.setVisible(true);

// inputText = new SmartTextField("list Salary where EmpName equals Mark", 64);
 inputText = new TextField("list Salary where EmpName equals Mark", 64);
 add(inputText); inputText.setBounds(80, 180, 500, 22);


 choice = new Choice();
 choiceChanged = false;
 choice.addItem("Examples ");
 for (int i=(examples.length - 1); i>=0; i--) choice.insert(examples[i], 1);
 choice.addItemListener(new ChoiceListener());
 add(choice); choice.setBounds(2, 210, 582, 25);

 Label label23 = new Label("Generated SQL:");
 label23.setFont(new Font("Dialog", Font.BOLD, 12));
 add(label23); label23.setBounds(2, 240, 120, 30);
 sqlText = new TextArea("",1,80,TextArea.SCROLLBARS_NONE);
 sqlText.setEditable(false);
 add(sqlText); sqlText.setBounds(130, 240, 455, 40);

 outputText = new TextArea("NLBean(tm) natural language interface\nCopyright 1997, Mark Watson. All rights reserved.\n", 8, 74);
 add(outputText); outputText.setBounds(2, 285, 582, 150);

 Label l1x = new Label("NLBean Copyright 1997-1999 by Mark Watson. www.markwatson.com");
 l1x.setFont(new Font("Dialog", Font.ITALIC, 14));
 add(l1x);
 l1x.setBounds(5, 442, 540, 16);

 // * * *
 list1_last_selection=-1; list2_last_selection=-1; list3_last_selection=-1;
 setBounds(20, 20, 590, 464);
 setupHelper();

 }

 private void setupHelper() {

 if (loadSynonyms) {
 for (int i=0; i<synonyms.length; i++) addSynonym(synonyms[i]);
 }

 if (loadDB) {
 for (int i=0; i<databaseNames.length; i++) {
 engine.addDB(databaseNames[i], userNames[i], passwords[i], tableLists[i]);
 }
 }
 engine.initDB();
 }

 // Suggest spelling corrections, or other words:

 // synchronized private String[] suggestedWords(String a_word) {
 // return engine.suggestedWords(a_word);
 // }

 synchronized private void putText(String s, boolean replace_flag) {
 if (replace_flag==false) {
 outputText.append(s);
 } else {
 outputText.setText(s);
 }
 }

 synchronized private String inText(String new_val, boolean set_flag) {
 if (set_flag) {
 inputText.setText(new_val);
 return "";
 }
 return inputText.getText();
 }

 synchronized private void query() {
 System.out.println("Entering query()");

 sqlText.setText("");

 String a_query = inText("", false);
 System.out.println("query(): a_query=" + a_query);
 String sql_query=null;
 if (a_query.startsWith("SELECT") || a_query.startsWith("select")) {
 sql_query = a_query;
 } else {
 engine.parse(a_query);
 sql_query = engine.getSQL();
 }

 if (sql_query==null) {
 System.out.println("No SQL for " + a_query);
 return;
 }
 System.out.println("SQL query: " + sql_query);

 sqlText.setText(sql_query);

 try {
 engine.createResultSet(sql_query, databaseNames[0], userNames[0], passwords[0]);
 putText("Query results:\n", false);
 String data = engine.getRows(sql_query, databaseNames[0], userNames[0], passwords[0]);
 putText(engine.toEnglish(data) + "\n", false);
 } catch (Exception e) {
 e.printStackTrace();
 }
 }

 private boolean usingAWT = false;

 private boolean loadSynonyms = true;
 private boolean loadDB = true;

 private void addSynonym(String def_string) {
 int pos = def_string.indexOf("=");
 String description = def_string.substring(0,pos);
 String column = def_string.substring(pos+1);
 if (engine!=null) {
 engine.addSynonym(column, description);
 }
 }

 // Use an inner classes for mouse event handling:
 class MouseQuery extends MouseAdapter implements Serializable {
 // The magic: access the public query method in the
 // containing class:
 synchronized public void mouseReleased(MouseEvent mevt) {
 query();
 }
 }

 // Use an inner classes for mouse event handling:
 class MouseSelect1 extends MouseAdapter implements Serializable {
 synchronized public void mouseReleased(MouseEvent mevt) {
 if (list1_last_selection != list1.getSelectedIndex()) {
 list1_last_selection = list1.getSelectedIndex();
 String s="";
 if (list1_last_selection >= 0 && list1_last_selection < tableLists.length) {
 s = tableLists[list1_last_selection];
 }
 System.out.println("s=" + s);
 String temp [] = Util.parseStrings(s);
 list2.removeAll(); list3.removeAll();
 for (int i=0; i<temp.length; i++) list2.addItem(temp[i]);
 }

 }
 }

 // Use an inner classes for mouse event handling:
 class MouseSelect2 extends MouseAdapter implements Serializable {
 synchronized public void mouseReleased(MouseEvent mevt) {
 if (list2_last_selection != list2.getSelectedIndex()) {
 list2_last_selection = list2.getSelectedIndex();
 list3.removeAll();
 String sel1 [] = list1.getSelectedItems();
 if (sel1!=null) {
 if (sel1.length>0) {
 String sel2 [] = list2.getSelectedItems();
 if (sel2!=null) {
 if (sel2.length>0) {
 String user="";
 String pass="";
 if (list1_last_selection >= 0 && list1_last_selection < userNames.length) {
 user = userNames[list1_last_selection];
 }
 try {

 String cols[] = engine.getColumnNames(sel2[0],
 sel1[0], user, pass);

 if (cols!=null) {
 for (int j=0; j<cols.length; j++) {
 list3.addItem(cols[j]);
 }
 }
 } catch (Exception e) { }

 }
 }
 }
 }
 }
 }
 }


 // Use an inner classes for mouse event handling:
 class MouseSelect3 extends MouseAdapter implements Serializable {
 synchronized public void mouseReleased(MouseEvent mevt) {
 if (list3_last_selection != list3.getSelectedIndex()) {
 System.out.println("TESTING 3rd list selection");
 list3_last_selection = list3.getSelectedIndex();
 String [] sel1x = list1.getSelectedItems();
 if (sel1x!=null) {
 if (sel1x.length>0) {
 String sel2 [] = list2.getSelectedItems();
 String sel3 [] = list3.getSelectedItems();
 if (sel2!=null && sel3!=null) {
 if (sel3.length>0) {
 String user="";
 String pass="";
 if (list1_last_selection >= 0 && list1_last_selection < userNames.length) {
 user = userNames[list1_last_selection];
 pass = passwords[list1_last_selection];
 }
 try {

 String r = engine.getRows("SELECT " + sel3[0] + " FROM " + sel2[0],
 sel1x[0],
 user,
 pass);
 if (r==null) return;
 putText(r + "\n", false);
 } catch (Exception e) { }
 }
 }
 }
 }
 }
 }
 }

 private Choice choice;
 transient private boolean choiceChanged = false;

 class ChoiceListener implements ItemListener {
 public void itemStateChanged(ItemEvent ie) {
 System.out.println("choice menu: " + ie.paramString());
 System.out.println("choice menu: " + (String)ie.getItem());
 String sel = (String)ie.getItem();
 if (sel.equals("Examples")) return;
 inText(sel, true);
 if (choiceChanged==false) {
 choice.remove(0);
 choiceChanged=true;
 }
 System.out.println("choice menu: <returning>");
 }
 }

 private Help help;

 class MouseHelp extends MouseAdapter implements Serializable {
 public void mouseReleased(MouseEvent mevt) {
 help.setVisible(true);
 }
 }

 public static void main(String args[]) {
 Frame f = new Frame();
 NLBean sc = new NLBean();
 f.add(sc);
 f.setTitle("NLBean version 4.0");
 f.pack();
 f.show();
 f.addWindowListener(new java.awt.event.WindowAdapter() {
 public void windowClosing(WindowEvent e) {
 System.exit(0);
 }
 });
 }

 private TextArea outputText;
 private /* Smart */ TextField inputText;
 private TextArea sqlText;

 private java.awt.List list1, list2, list3;
 private int list1_last_selection, list2_last_selection, list3_last_selection;

 // properties for specifying a few sample natural language
 // queries to place at the beginning of the 'Example'
 // 'choice' control. NOTE: this program automatically
 // adds additional examples that it generates from examining
 // the field names of the database tables.

 private String [] examples = {
 "list email address where name equals Mark",
 "list salary where employee name equals Mark",
 "list salary where hire date is after 1993/1/5 and employee name equals Mark",
 "list name, phone number, and email address where name equals Mark",
 "list employee name, salary, and hire date where hire date is after January 10, 1993",
 "list salary where hire date is after January 1, 1993 or employee name equals Carol",
 "list product name where cost is less than $20"
 };

 // Set up for synonyms:
 private String [] synonyms = {
 "employee name=EmpName",
 "hire date=HireDate",
 "phone number=PhoneNumber",
 "email address=Email",
 "product name=productname",
 "products=productname",
 "product=productname"
 };

 // for four properties each for up to three databases:

 // Demo database information
 private String [] databaseNames = {"jdbc:idb:database/nlbean.prp"};
 private String [] userNames = {"Admin"};
 private String [] passwords = {"sammy"};
 private String [] tableLists= {"NameTable;products;Employees"};

 //
 // Inner class to handle text input field:
 //

 transient protected int startWordPos=0, stopWordPos=0;

 class SmartTextField extends TextField implements Serializable {
 public SmartTextField(String s, int width) {
 super(s, width);
 helper();
 }
 public SmartTextField(String s) {
 super(s);
 helper();
 }
 public SmartTextField() {
 super();
 helper();
 }
 private void helper() {
 addMouseListener(new MouseText());
 addKeyListener(new MyKeyAdapter());
 setEditable(true);
 setFont(new Font("default", Font.PLAIN, 12));
 words = new String[20];
 for (int i=0; i<20; i++) words[i]="";
 num_words=0;
 }

 transient private String words[] = null;
 transient int num_words;

 public String getWord(int charPos) {
 startWordPos=stopWordPos=-1;
 String s = getText();
 // find start of word:
 int start = charPos-1;
 try {
 while (start >= 0 && s.charAt(start)!=' ') {
 start--;
 }
 start++;
 } catch (Exception e) {}
 // find the end of word:
 int stop=charPos;
 try {
 while (stop < s.length() && s.charAt(stop)!=' ') {
 stop++;
 }
 } catch (Exception e) {}
 if (start<0) start=0;
 //if (stop>s.length()-1) stop=s.length()-1;
 System.out.println("getWord(): start=" + start + ", stop=" + stop);
 //if (stop > s.length() - 2) stop = s.length() - 1;
 int stp = stop;
 if (stop>my_char_pos) {
 stop=my_char_pos;
 System.out.println(" stop reset to " + stop);
 }
 if (start < stop) {
 startWordPos=start;
 stopWordPos=stp;

 System.out.println("getWord() returning: |" + s.substring(start, stop) + "|");

 return s.substring(start, stop);
 }
 else return "";
 }


 public void setUpperCase(int charPos) {
 String s = getText();
 // find start of word:
 int start = charPos-1;
 try {
 while (start >= 0 && s.charAt(start)!=' ') {
 start--;
 }
 start++;
 } catch (Exception e) {}
 // find the end of word:
 int stop=charPos;
 try {
 while (stop < s.length() && s.charAt(stop)!=' ') {
 stop++;
 }
 } catch (Exception e) {}
 if (start<0) start=0;
 if (stop>s.length()) stop=s.length();
 if (stop>my_char_pos) stop=my_char_pos;
 if (start < stop) {
 StringBuffer sb = new StringBuffer(s);
 for (int i=start; i<stop; i++) {
 char ch = sb.charAt(i);
 if (ch >= 'a' && ch <= 'z') ch += 'A' - 'a';
 sb.setCharAt(i, ch);
 }
 setText(new String(sb));
 setCaretPosition(stop);
 }
 }

 transient private int charWidth = -1;
 transient private FontMetrics fm = null;

 public void paint(Graphics g) {
 super.paint(g);
 if (fm==null) {
 fm = g.getFontMetrics();
 }
 }

 private int getPixelWidth(String s) {
 if (fm==null) return 1;
 return fm.stringWidth(s);
 }

 transient private int my_char_pos=0;

 public int getCharPos(int pixel) {
 String s = getText();
 my_char_pos=-1;
 if (getPixelWidth(s) < pixel) return -1; // to right of text
 int len = s.length();
 for (int i=1; i<len; i++) {
 if (getPixelWidth(s.substring(0, i)) > pixel - 12) {
 my_char_pos=i;
 return i;
 }
 }
 my_char_pos = len-1;
 return len-1;
 }

 // Handle mouse events over the input text window:
 class MouseText extends MouseAdapter implements Serializable {
 public void mousePressed(MouseEvent mevt) {
 int x = mevt.getX();
 int charPos = getCharPos(x);
 if (charPos<0) return;
 my_char_pos = 1000; // special for mouse click only!
 String word = getWord(charPos);

 System.out.println("MouseText.mousePressed(): getWord returned: " + word);

 if (word.length() < 1) return;
 System.out.println("x=" + x + ", charPos=" + charPos +
 ", word=" + word);
 }
 }

 class MyKeyAdapter extends KeyAdapter implements Serializable {
 public void keyTyped(KeyEvent ke) {
 if (ke.getKeyChar()==KeyEvent.VK_SPACE ||
 ke.getKeyChar()==KeyEvent.VK_COMMA ||
 ke.getKeyChar()==KeyEvent.VK_PERIOD)
 {
 // Handle new word:
 //System.out.println("New word. all text:" + getText());
 int charPos = getCaretPosition();
 my_char_pos = charPos;
 System.out.println("** charPos=" + charPos);
 String word = getWord(charPos);
 System.out.println("** word =" + word);
 }
 }
 }
 }
}

NLEngine.java

2001-12-08T16:00:00Z

// nlbean.NLEngineLocal.java
//
// Copyright 1997, 1999 Mark Watson.
//

package nlbean;

import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.text.*;
import java.util.*;
import java.beans.*;
import java.sql.*;
import java.util.Vector;
import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;

public class NLEngine implements Serializable {

 public NLEngine() {

 // Create a DBInfo object and initialize it with the current
 // database properties:
 dbinfo = new DBInfo();

 nlp = new NLP(dbinfo);

 // lexicon_data = nlp.lexicon_data;
 }

 public void addDB(String name, String user, String passwd, String tbls) {
 if (numDB < 4) {
 databaseName[numDB] = name;
 userName[numDB] = user;
 password[numDB] = passwd;
 tableList[numDB] = tbls;
 numDB++;
 }
 }

 public void initDB() {
 for (int d=0; d<numDB; d++) {
 if (databaseName[d]!=null) {
 String tl[] = Util.parseStrings(tableList[d]);
 if (tl!=null) {
 for (int i=0; i<tl.length; i++) {
 try {
 String cols[] = DBInterface.getColumnNames(tl[i],
 databaseName[d],
 userName[d],
 password[d]);
 if (cols!=null) {
 // lexicon_data.addTableName(tl[i]);
 dbinfo.addTable(tl[i], databaseName[d], userName[d], password[d], cols);
 // if (lexicon_data!=null) {
 // for (int ii=0; ii<cols.length; ii++) {
 // System.out.println("adding column name to lexicon: " + cols[ii]);
 // lexicon_data.addColumnName(cols[ii]);
 // }
 // } else {
 // System.out.println("null lexicon_data");
 // }
 }
 } catch (Exception e) { }
 }
 }
 }
 }

 dbinfo.debug();
 }

 // NLP data and methods:

 public void parse(String s) {

 // Remove any commas from the input text:
 for (int i=0; i<20; i++) {
 int idx = s.indexOf(",");
 if (idx>-1) {
 s = s.substring(0,idx) + s.substring(idx+1);
 } else {
 break;
 }
 }
 // Remove any periods from the input text:
 for (int i=0; i<10; i++) {
 int idx = s.indexOf(".");
 if (idx>-1) {
 s = s.substring(0,idx) + s.substring(idx+1);
 } else {
 break;
 }
 }

 // remove extra spaces and convert to lower case:
 s = " " + Util.removeExtraSpaces(s).toLowerCase() + " ";

 // before calling the NLP class parse method, we
 // need to replace synonyms:

 numSynReplacements = 0;
 for (int i=0; i<numSynonyms; i++) {
 // allow for multiple uses of the same synonym:
 for (int repeat=0; repeat<4; repeat++) {
 int idx = s.indexOf(synonymDescription[i]);
 if (idx>-1) {
 s = s.substring(0,idx+1) +
 synonymColumnName[i] + 
 s.substring(idx + synonymDescription[i].length() - 1);
 syns[numSynReplacements] = synonymColumnName[i];
 origs[numSynReplacements] = synonymDescription[i];
 numSynReplacements++;
 } else {
 break;
 }
 }
 }

 // remove extra spaces (just to make sure!):
 s = Util.removeExtraSpaces(s);

 nlp.parse(s);
 }

 // See if a word is "known" (this includes table and column names):

 // public boolean goodWord(String s) {
 // if (lexicon_data.wordInLexicon(s.toLowerCase())) return true;
 // return false;
 // }

 public String getSQL() {
 return nlp.getSQL();
 }
 private int num_rows_from_database = 0;
 public String [] breakLines(String s) {
 String [] ret = new String[40];
 int count = 0;
 num_rows_from_database = 0;
 try {
 StringReader sr = new StringReader(s);
 BufferedReader br = new BufferedReader(sr);
 while (true) {
 String s2 = br.readLine();
 if (s2 == null || s2.length() < 1) break;
 num_rows_from_database++;
 // change for InstantDB: comma separated terms:
 int index = 0;
 while (true) {
 index = s2.indexOf(",");
 if (index == -1) {
 if (count > 38) break;
 ret[count++] = s2.trim();
 break;
 } else {
 if (count > 38) break;
 ret[count++] = s2.substring(0, index);
 s2 = s2.substring(index + 1);
 }
 }
 }
 String [] ret2 = new String[count];
 for (int i=0; i<count; i++) ret2[i] = ret[i];
 return ret2;
 } catch (Exception e) { }
 return null;
 }

 public String toEnglish(String r) {
 System.out.println("NLEngineLocal.toEnglish(" + r + ")");
 return nlp.toEnglish(breakLines(r), syns, origs,
 numSynReplacements, num_rows_from_database);
 }

 public void createResultSet(String sql_query, String database,
 String user, String password) {
 //SQL.createResultSet(sql_query, database, user, password);
 }

 public String [] getColumnNames(String sql_query, String database,
 String user, String password) {
 try {
 return DBInterface.getColumnNames(sql_query, database,
 user, password);
 } catch (Exception e) { }
 return null;
 }

 public String getRows(String sql_query, String database,
 String user, String password) {
 try {
 return DBInterface.query(sql_query, database,
 user, password);
 } catch (Exception e) { }
 return null;
 }

 public DBInfo dbinfo;
 private NLP nlp;

 // Allow developers to define a few synonyms for a particular
 // application:
 private String synonymColumnName[] = new String[11];
 private String synonymDescription[] = new String[11];
 private int numSynonyms = 0;

 // For use in generating nglish output for queries:
 private String syns[] = new String[11];
 private String origs[] = new String[11];
 private int numSynReplacements=0;

 public void clearSynonyms() {
 numSynonyms = 0;
 }

 public void addSynonym(String column, String description) {
 if (numSynonyms<10) {
 synonymColumnName[numSynonyms] = column;
 synonymDescription[numSynonyms] = " " + description + " ";
 numSynonyms++;
 }
 }

 // for four properties each for up to five databases:
 private String databaseName[] = new String[5];
 private String userName[] = new String[5];
 private String password[] = new String[5];
 private String tableList[] = new String[5];
 private int numDB=0;

}

NeuralNetwork.html

2001-12-05T16:00:00Z

Chess Tree Search.html

2001-11-12T16:00:00Z

Expert Systems.html

2001-10-21T16:00:00Z

Fuzzy Faq.html

2001-07-03T16:00:00Z

NeuralNetwork.pdf

2001-07-03T16:00:00Z

NeuralNetwork_FAQ.html

2001-07-03T16:00:00Z

program.class

2000-06-25T16:00:00Z

prologop.class

2000-06-25T16:00:00Z

prologtokenizer.class

2000-06-25T16:00:00Z

rack.class

2000-06-25T16:00:00Z

solver.class

2000-06-25T16:00:00Z

term.class

2000-06-25T16:00:00Z