/*
  Copyright 2006 by Sean Luke
  Licensed under the Academic Free License version 3.0
  See the file "LICENSE" for more information
*/


package ec.util;
import java.lang.reflect.*;
import javax.swing.tree.*;
import javax.swing.event.*;

public class ReflectedObject implements TreeModel
    {
    Class type;     // the class or TYPE of the object
    Object obj;     // the object.  Primitive objects are cast into their wrapper types
    String name;    // the name of the instance variable holding the object.  Top-level objects have a name of "->"
    Object uniq;    // a unique identifier for this particular instance variable (used to make getIndexOfChild() possible, ick)
    static ReflectedObject unknown = new ReflectedObject(null)
        {
        public String toString() { return ""; }
        };
    
    public ReflectedObject(Object o)
        {
        this(o,(o==null ? Object.class : o.getClass()),null,null);
        }
        
    protected ReflectedObject(Object o, Class t, String n, Object u)
        {
        obj = o;
        type = t;
        name = n;
        uniq = u;
        }
    
    public String toString()
        {
        String field = (name == null ? "" : name + ": ");
        try {
            if (obj == null) return field + "null";
            else if (type.isArray()) return field + type.getName() + ", length=" + Array.getLength(obj);
            return field+type.getName()+" "+obj.toString();
            } catch (Exception e) {
            e.printStackTrace();
            return field + type.getName() + " ";
            }
        }
        
    public int getNumChildren()
        {
        return getNumFields() + getNumProperties();
        }
    
    public ReflectedObject getChild(int index)
        {
        int f = getNumFields();
        if (index < f) return getField(index);
        else return getProperty(index - f);
        }
    
    public ReflectedObject[] getChildren()
        {
        ReflectedObject[] fields = getFields();
        ReflectedObject[] props = getProperties();
        ReflectedObject o[] = new ReflectedObject[fields.length + props.length];
        System.arraycopy(fields,0,o,0,fields.length);
        System.arraycopy(props,0,o,fields.length,props.length);
        return o;
        }

    public int getNumFields()
        {
        try
            {
            if (obj == null || type.isPrimitive()) return 0;
            else if (type.isArray())
                {
                return Array.getLength(obj);
                }
            else
                {
                return type.getFields().length;
                }
            }
        catch (IllegalArgumentException e) { e.printStackTrace(); throw new RuntimeException("Unexpected Exception: " + e); }
        }
    
    public ReflectedObject getField(int index)
        {
        try
            {
            if (obj == null || type.isPrimitive() || index < 0) return null;
            else if (type.isArray())
                {
                int len = Array.getLength(obj);
                if (index > len) return null;
                return new ReflectedObject(Array.get(obj,index), type.getComponentType(),""+index, ""+index);
                }
            else
                {
                Field[] f = type.getFields();
                int len = f.length;
                if (index > len) return null;
                return new ReflectedObject(f[index].get(obj), 
                        (f[index].get(obj) == null || f[index].getType().isPrimitive() ? 
                        f[index].getType() : f[index].get(obj).getClass()), 
                    f[index].getName(), f[index]);
                }
            }
        catch (IllegalArgumentException e) { e.printStackTrace(); throw new RuntimeException("Unexpected Exception: " + e); }
        catch (IllegalAccessException e) { e.printStackTrace(); throw new RuntimeException("Unexpected Exception: " + e); }
        }
    
    public ReflectedObject[] getFields()
        {
        try
            {
            if (obj == null || type.isPrimitive()) return new ReflectedObject[0];
            else if (type.isArray())
                {
                int len = Array.getLength(obj);
                ReflectedObject[] ref = new ReflectedObject[len];
                for(int x = 0; x < len; x++)    
                    ref[x] = new ReflectedObject(Array.get(obj,x), type.getComponentType(),""+x,""+x);
                return ref;
                }
            else
                {
                Field[] f = type.getFields();
                int len = f.length;
                ReflectedObject[] ref = new ReflectedObject[len];
                for(int x=0;x