/** * mazeModel.java * Implements the responsibilities of the Environment agent's Model role * Notice that no Zeus code is imported, as this is not an agent-level component */import java.awt.*;import java.awt.event.*;import java.util.*;import java.io.*;import javax.swing.*;public class mazeModel{  public int mazeHeight = 10;  public int mazeWidth = 10;  public boolean [][] thisMaze =  {    {true,  true,  true,  true,  false, false, true,  true,  true,  true },    {false, false, false, true,  false, true,  false, false, true,  false},    {false, true,  false, false, false, false, false, false, true,  false},    {false, true,  false, true,  true,  true,  true,  false, false, false},    {false, true,  false, false, false, false, true,  true,  true,  false},    {false, true,  false, true,  false, false, false, true,  false, false},    {false, true,  true,  true,  false, true,  false, false, false, false},    {false, true,  false, false, false, true,  false, true,  false, true },    {false, true,  true,  true,  true,  true,  true,  true,  false, true },    {false, false, false, false, true,  false, false, false, false, false}  };  /* public boolean [][] bigMaze =  {      { false, false, true,  false, false, true,  true,  true,  true,  false, false, true,  false, false, true },      { true,  false, false, false, true,  false, false, false, true,  false, true,  false, false, true,  true },      { true,  false, true,  false, true,  false, true,  false, false, false, false, false, false, true,  false},      { true,  true,  true,  false, true,  false, false, false, false, false, false, true,  true,  true,  true },      { false, false, false, true,  false, false, false, false, true,  false, true,  true,  false, false, false},      { false, true,  true,  true,  false, false, true,  false, true,  true,  true,  true,  false, false, false},      { false, true,  false, false, false, false, true,  true,  true,  false, false, false, false, true,  false},      { false, true,  false, true,  false, false, false, true,  false, false, false, true,  true,  true,  true },      { false, true,  true,  true,  false, true,  false, false, false, true,  false, false, false, true,  false},      { false, true,  false, false, false, true,  false, true,  false, true,  false, true,  false, true,  false},      { false, true,  true,  true,  true,  true,  true,  true,  false, true,  false, true,  false, true,  false},      { false, false, false, false, false, false, false, false, false, false, false, false, false, true,  true },      { true,  false, false, false, true,  false, false, false, true,  false, true,  true,  false, true,  false},      { true,  false, true,  false, true,  false, true,  false, false, false, false, false, false, true,  false},      { false, false, false, false, false, false, false, false, false, false, false, false, false, false, false},  }; */  private boolean agentUpdate = true;  private boolean mazeUpdate = true;  private Dimension target = null;  private Dimension agentToRemove = new Dimension();  public Hashtable agents = new Hashtable();  public mazeModel ()  {    target = new Dimension (mazeWidth/2, mazeHeight/2);  }  public void createEmptyMaze(int mazeWidth, int mazeHeight)  {    this.mazeWidth = mazeWidth;    this.mazeHeight = mazeHeight;    thisMaze = new boolean [mazeWidth] [mazeHeight];    for (int countOuter = 0; countOuter < mazeWidth; countOuter ++) {      for (int countInner = 0; countInner < mazeHeight; countInner++) {        thisMaze [countOuter] [countInner] = false; }    }  }  public void moveNorth (String id) {    Dimension agentPos = (Dimension) agents.get(id);    if (agentPos == null) return; // if the agent doesn't exit No Effect!    agentToRemove = agentPos; // so we can delete the old graphic neatly    agentUpdate = true;    if (agentPos.height > mazeHeight -1) return; // No Effect if Goal reached.    agentPos.height--;  }  public void moveSouth (String id) {    Dimension agentPos = (Dimension) agents.get(id);    if (agentPos == null) return; // if the agent doesn't exit No Effect!    agentToRemove = agentPos; // so we can delete the old graphic neatly    agentUpdate = true;    if (agentPos.height < 0) return; // No Effect at bottom of maze    agentPos.height++;  }  public void moveEast (String id) {    Dimension agentPos = (Dimension) agents.get(id);    if (agentPos == null) return; // if the agent doesn't exit No Effect!    agentToRemove = agentPos; // so we can delete the old graphic neatly    agentUpdate = true;    if (agentPos.width > mazeWidth -1) return; // No Effect if at east already.    agentPos.width++;  }  public void moveWest (String id) {    Dimension agentPos = (Dimension) agents.get(id);    if (agentPos == null) return; // if the agent doesn't exit No Effect!    agentToRemove = agentPos; // so we can delete the old graphic neatly    agentUpdate = true;    if (agentPos.width < 1) return; // No Effect if at max west already    agentPos.width--;  }  public void registerAgent (String id, int col, int row) {     Dimension agentPos = new Dimension();     agentPos.width  = col;     agentPos.height = row;     agents.put(id, agentPos);  }  public String southVal(String id) {    try {    id = lookupHash(id);    Dimension position =(Dimension) agents.get(id);    if (position == null) return ("null");    int row = position.height;    int col = position.width;    if (row > mazeHeight - 1) return ("false");        else if (thisMaze [row+1][col])            return ("true");            else return ("false");    }catch (Exception e) { return ("true"); }  }  public String northVal (String id) {    try {    id = lookupHash(id);    Dimension position =(Dimension) agents.get(id);    if (position == null) return ("null");    int row = position.height;    int col = position.width;    if (row <  1) return ("true");        else if (thisMaze [row-1][col])            return ("true");            else return ("false");             }catch (Exception e) { return ("true"); }  }  public String eastVal (String id){    try {    id = lookupHash(id);    Dimension position =(Dimension) agents.get(id);    if (position == null) return ("null");    int row = position.height;    int col = position.width;    if (col  > mazeWidth - 1 ) return ("true");        else if (thisMaze [row][col+1])            return ("true");            else return ("false");             }catch (Exception e) { return ("true"); }  }  public String westVal (String id){    try {    id = lookupHash(id);    Dimension position =(Dimension) agents.get(id);    if (position == null) return ("null");    int row = position.height;    int col = position.width;    if (col < 1) return ("true");        else if (thisMaze [row][col- 1])            return ("true");            else return ("false");             }catch (Exception e) { return ("true"); }    }    public boolean boolVal(String value) {        if (value.equals ("true")) return (true);        if (value.equals("false")) return (false);        return (false);  }  public String lookupHash (String id)   {    Enumeration allids = agents.keys();    String currentStr = null;    while (allids.hasMoreElements()) {        currentStr = (String) allids.nextElement();        if (currentStr.equals(id)) return (currentStr);    }    System.out.println("Error in MazeMap - agentId unknown: " + id);    return ("null");  }  /**   * if the agent (id) is allowed to move in the way indicated by the four    * booleans (north, east, south, west), return true otherwise return false   */  public boolean isLegalMove (String id, boolean north, boolean east, boolean south, boolean west)  {    boolean northFlag = true;    boolean eastFlag = true;    boolean westFlag = true;    boolean southFlag = true;    id = lookupHash(id);    if (north) northFlag = !boolVal(northVal(id));    if (!northFlag) return (false);    if (east) eastFlag =  !boolVal(eastVal(id));    if (!eastFlag) return (false);    if (west) westFlag = !boolVal(westVal (id));    if (!westFlag) return (false);    if (south) southFlag = !boolVal(southVal(id));    if (!southFlag) return (false);    return (true);  }  public boolean exited (String id) {    id = lookupHash(id);    Dimension pos = (Dimension) agents.get(id);    if (pos.height == target.height && pos.width == target.width)        return true;    else        return false; }  public boolean isTarget (int col, int row) {    if (target.width == row && target.height == col ) return true;    else      return false;  }  public void setTarget (int col, int row) {    target.width = col;    target.height = row;  }  public void changeStatus (int col, int row) {    if (thisMaze [row][col]) thisMaze[row][col]= false;    else        thisMaze [row][col] = true;  }  public boolean moveAgent (String id, boolean north, boolean east, boolean south, boolean west)  {    System.out.println("In moveAgent");    id = lookupHash(id);    Dimension position = (Dimension) agents.get(id);    agentToRemove = position;    System.out.println("Agent " + id +" Vertical = " + String.valueOf(position.height) +                       " Horizontal = " + String.valueOf (position.width) );    if (north) {      moveNorth(id);      return (true);    }    if (south) {      moveSouth (id);      return (true);    }    if (east) {      moveEast (id);      return (true);    }    if (west) {      moveWest(id);      return (true);    }    return (false);  }}