gt:     if (i < m_children.size()) {
context: /*
   *    This program 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.
   *
   *    This program 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 this program; if not, write to the Free Software
   *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  /*
   *    Node.java
   *    Copyright (C) 1999 Malcolm Ware
   *
   */
  
  package weka.gui.treevisualizer;
  
  import java.awt.*;
  import java.util.*;
  import java.io.*;
  import weka.core.Instances;
  
  
  //this is a node structure that to be useful needs the Edge class as well
  
  //note i have done an unintentional naughty thing
  //getHeight() returns the pixel height of the node
  //getHeight(Node,int) returns how many levels down the tree goes
  //setHeight(int) is associated to the prior
  
  /**
   * This class records all the data about a particular node for displaying.
   *
   * @author Malcolm Ware (mfw4@cs.waikato.ac.nz)
   * @version $Revision: 1.3 $
   */
  public class Node {
    
    /** The fill mode for the node (not in use). */
    private int m_backstyle;       //how the back color will fill
  
    /** The shape of the node. */
    private int m_shape;
  
    /** The color of the node. */
    private Color m_color;
  
    /** the text for the node. */
    private String m_label;
  
    /** the text broken up into lines */
    private Vector m_lines;
  
    //the coord of the left side .note all coords are
    //between 1-0 for scaling per Stuart's suggestion
    /** The center of the node (between 0 and 1). */
    private double m_center;       //coord of the center . main x value used
  
    /** The top of the node (between 0 and 1). */
    private double m_top;          //main y coord to go by
       
    /** true if this nodes descendants are visible (not in use currently). */
    private boolean m_cVisible;   //whether it's descendants are visible
  
    /** true if this node is visible (not currently in use). */
    private boolean m_visible;     //whether it's visible
  
    /** true if this is the top of the tree. ie has no parent */
    private boolean m_root;     //whether it is anscestor to all i.e top of tree 
  
    /** An array containing references to all the parent edges 
     * (only 1 currently). */
    private Vector m_parent;      //the edge to its parent edges(or itself 
  
    //if true root)
    /** An array containing references to all the child edges. */
    private Vector m_children;     //a vector list of edges to the nodes children
  
    /** The ID string for this node (used for construction purposes) */
    private String m_refer;
  
    /** A String containing extra information about the node. */
    private String m_data;
  
    /**
     * An Instances variable generated from the data.
     * Note that if this exists then the string shall be NULL to save space.
     */
    private Instances m_theData;
  
    /**
     * This will setup all the values of the node except for its top and center.
     *
     * @param label The text for the node.
     * @param refer The ID string for this node.
     * @param backstyle The backstyle of this node.
     * @param shape The shape of this node.
     * @param color The color of this node.
     */
    public Node(String label,String refer,int backstyle,int shape,
  	      Color color,String d) {
      m_label = label;
      m_backstyle = backstyle;
      m_shape = shape;
      m_color = color;
      m_refer = refer;
     
      m_center = 0;
      m_top = 0;
  
      m_cVisible = true;
      m_visible = true;
      m_root = false;
      m_parent = new Vector(1,1);
      m_children = new Vector(20,10);
      m_lines = new Vector(4,2);
      breakupLabel();
      m_data = d;
      m_theData = null;
    } 	
    
    /**
     * This will return the Instances object related to this node.
     * If it has not been allocated then that will be done also.
     *
     * @return The Instances object.
     */
    public Instances getInstances() {
      if (m_theData == null && m_data != null) {
        try {
  	m_theData = new Instances(new StringReader(m_data));
        } catch(Exception e) {
  	System.out.println("Error : " + e);
        }
        m_data = null;
      }
      return m_theData;
    }
  
    /**
     * Get If this node's childs are visible.
     *
     * @return True if the childs are visible.
     */
    public boolean getCVisible() {
      return m_cVisible;
    }
  
    /** 
     * Recursively goes through the tree and sets all the children and the 
     * parent to visible.
     *
     * @param r The current node to set visible.
     */
    private void childVis(Node r) {
      Edge e;
      r.setVisible(true);
      if (r.getCVisible()) {
        for (int noa = 0;(e = r.getChild(noa)) != null;noa++) {
  	childVis(e.getTarget());
        }
      }
    }
  
    /**
     * Sets all the children of this node either to visible or invisible
     *
     * @param v True if the children are to be visible
     */
    public void setCVisible(boolean v) {
      m_cVisible = v;
      if (v) {
        childVis(this);
      }
      else if (!v) {
        childInv(this);
      }
    }
    
    /**
     * Recursively goes through the tree and sets all the children to invisible,
     * Not the parent though.
     *
     * @param r The current node from whom the children are gonna be set 
     * invisible.
     */
    private void childInv(Node r) {
      Edge e;
      Node s;
      for (int noa = 0;(e = r.getChild(noa)) != null;noa++) {
        s = e.getTarget();
        s.setVisible(false);
        childInv(s);
      }
    }
    
  
   
    
   
    
  
  
    /**
     * Get the value of refer.
     *
     * @return Value of refer.
     */
    public String getRefer() {
      
      return m_refer;
    }
    
    /**
     * Set the value of refer.
     *
     * @param v  Value to assign to refer.
     */
    public void setRefer(String v) {
      
      m_refer = v;
    }
    
    
    
    /**
     * Get the value of shape.
     *
     * @return Value of shape.
     */
    public int getShape() {
      
      return m_shape;
    }
    
    /**
     * Set the value of shape.
     *
     * @param v  Value to assign to shape.
     */
    public void setShape(int v) {
      
      m_shape = v;
    }
    
    
    /**
     * Get the value of color.
     *
     * @return Value of color.
     */
    public Color getColor() {
      
      return m_color;
    }
    
    /**
     * Set the value of color.
     *
     * @param v  Value to assign to color.
     */
    public void setColor(Color v) {
      
      m_color = v;
    }
    
    
    /**
     * Get the value of label.
     *
     * @return Value of label.
     */
    public String getLabel() {
      
      return m_label;
    }
    
    /**
     * This Will break the node's text up into lines.
     *
     */
    private void breakupLabel() {
      int prev = 0,noa;
      for (noa = 0;noa < m_label.length();noa++) {
        if (m_label.charAt(noa) == '\n') {
  	m_lines.addElement(m_label.substring(prev,noa));
  	prev = noa+1;
        }
      }
      m_lines.addElement(m_label.substring(prev,noa));
      
    }
    
    /**
     * This will return the width and height of the rectangle that the text 
     * will fit into.
     *
     * @param f The size info for the Font.
     * @return A Dimension containing the size of the text.
     */
    public Dimension stringSize(FontMetrics f) {
      Dimension d = new Dimension();
      int old = 0;
      String s;
      int noa = 0;
      while ((s = getLine(noa)) != null) {
        noa++;
        old = f.stringWidth(s);
        
        if (old > d.width) {
  	d.width = old;
        }
      }
      d.height = noa * f.getHeight();
      return d;
      
    }
  
    /**
     * Returns the text String for the specfied line.
     *
     * @param n The line wanted.
     * @return The String corresponding to that line.
     */
    public String getLine(int n) {
      if (n < m_lines.size()) {
        return (String)m_lines.elementAt(n);
      }
      else {
        return null;
      }
    }
    
    
    
  
    
   
    
  
    
    
    /**
     * Get the value of center.
     *
     * @return Value of center.
     */
    public double getCenter() {
      
      return m_center;
    }
    
    /**
     * Set the value of center.
     *
     * @param v  Value to assign to center.
     */
    public void setCenter(double v) {
      
      m_center = v;
    }
    
    /**
     * Will increase or decrease the postion of center.
     *
     * @param v The amount to increase or decrease center by.
     */
    public void adjustCenter(double v) {
      m_center += v;
    }
    
    
    /**
     * Get the value of top.
     *
     * @return Value of top.
     */
    public double getTop() {
      
      return m_top;
    }
    
    /**
     * Set the value of top.
     *
     * @param v  Value to assign to top.
     */
    public void setTop(double v) {
      
      m_top = v;
    }
    
  
    
    
    
    /**
     * Get the value of visible.
     *
     * @return Value of visible.
     */
    public boolean getVisible() {
      
      return m_visible;
    }
    
    /**
     * Set the value of visible.
     *
     * @param v  Value to assign to visible.
     */
    private void setVisible(boolean v) {
      
      m_visible = v;
    }
    
    
    
    
    /**
     * Get the value of root.
     *
     * @return True if has no parents.
     */
    public boolean getRoot() {
      
      return m_root;
    }
    
    /**
     * Set the value of root.
     *
     * @param v  Value to assign to root.
     */
    public void setRoot(boolean v) {
      
      m_root = v;
    }
    
    
    
    /**
     * Get the parent edge.
     *
     * @param i The parent number to get.
     * @return The parent edge or NULL if it doesn't exist.
     */
    public Edge getParent(int i) {
      
      if (i < m_parent.size()) {
        return (Edge)m_parent.elementAt(i);
      }
      else {
        return null;
      }
  
    }
    
    /**
     * Set the value of parent.
     *
     * @param v  Value to assign to parent.
     */
    public void setParent(Edge v) {
      
      m_parent.addElement(v);
    }
    
    
    
    /**
     * Get the Edge for the child number 'i'.
     *
     * @param i The child number to get.
     * @return The child Edge or NULL if it doesn't exist.
     */
    public Edge getChild(int i) {
      
  