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## weka.gui
Class GenericObjectEditor

    java.lang.Object
      weka.gui.GenericObjectEditor

All Implemented Interfaces:
  java.beans.PropertyEditor, CustomPanelSupplier

    public class GenericObjectEditor

extends java.lang.Object
implements java.beans.PropertyEditor, CustomPanelSupplier

A PropertyEditor for objects. It can be used either in a static or a dynamic way.
In the static way (`USE_DYNAMIC` is `false`) the objects have been defined as editable in the GenericObjectEditor configuration file, which lists possible values that can be selected from, and themselves configured. The configuration file is called "GenericObjectEditor.props" and may live in either the location given by "user.home" or the current directory (this last will take precedence), and a default properties file is read from the weka distribution. For speed, the properties file is read only once when the class is first loaded -- this may need to be changed if we ever end up running in a Java OS ;-).
If it is used in a dynamic way (`USE_DYNAMIC` is `true`) then the classes to list are discovered by the `GenericPropertiesCreator` class (it checks the complete classpath).

Version:
  $Revision: 1.38.2.8 $
Author:
  Len Trigg (trigg@cs.waikato.ac.nz), Xin Xu (xx5@cs.waikato.ac.nz), Richard Kirkby (rkirkby@cs.waikato.ac.nz), FracPete (fracpete at waikato dot ac dot nz)
See Also:
  `USE_DYNAMIC`, `GenericPropertiesCreator`, `GenericPropertiesCreator.CREATOR_FILE`, `RTSI`

Nested Class Summary
`class` | `GenericObjectEditor.GOEPanel` Handles the GUI side of editing values.
`class` | `GenericObjectEditor.JTreePopupMenu` Creates a popup menu containing a tree that is aware of the screen dimensions.

Constructor Summary
`GenericObjectEditor()` Default constructor.
`GenericObjectEditor(boolean canChangeClassInDialog)` Constructor that allows specifying whether it is possible to change the class within the editor dialog.

Method Summary
`void` | `addPropertyChangeListener(java.beans.PropertyChangeListener l)` Adds a PropertyChangeListener who will be notified of value changes.
`java.lang.String` | `getAsText()` Returns null as we don't support getting/setting values as text.
`java.lang.Object` | `getBackup()` Returns the backup object (may be null if there is no backup).
`javax.swing.JPopupMenu` | `getChooseClassPopupMenu()` Returns a popup menu that allows the user to change the class of object.
`java.awt.Component` | `getCustomEditor()` Returns the array editing component.
`javax.swing.JPanel` | `getCustomPanel()` Gets the custom panel used for editing the object.
`java.lang.String` | `getJavaInitializationString()` Supposedly returns an initialization string to create a Object identical to the current one, including it's state, but this doesn't appear possible given that the initialization string isn't supposed to contain multiple statements.
`java.lang.String[]` | `getTags()` Returns null as we don't support getting values as tags.
`java.lang.Object` | `getValue()` Gets the current Object.
`boolean` | `isPaintable()` Returns true to indicate that we can paint a representation of the Object.
`static void` | `main(java.lang.String[] args)` Tests out the Object editor from the command line.
`java.lang.Object` | `makeCopy(java.lang.Object source)` Makes a copy of an object using serialization
`void` | `paintValue(java.awt.Graphics gfx, java.awt.Rectangle box)` Paints a representation of the current Object.
`static void` | `registerEditors()` registers all the editors in Weka
`void` | `removePropertyChangeListener(java.beans.PropertyChangeListener l)` Removes a PropertyChangeListener.
`void` | `setAsText(java.lang.String text)` Returns null as we don't support getting/setting values as text.
`void` | `setClassType(java.lang.Class type)` Sets the class of values that can be edited.
`void` | `setDefaultValue()` Sets the current object to be the default, taken as the first item in the chooser
`void` | `setEnabled(boolean newVal)` Sets whether the editor is "enabled", meaning that the current values will be painted.
`void` | `setValue(java.lang.Object o)` Sets the current Object.
`static java.util.Hashtable` | `sortClassesByRoot(java.lang.String classes)` parses the given string of classes separated by ", " and returns the a hashtable with as many entries as there are different root elements in the class names (the key is the root element).
`boolean` | `supportsCustomEditor()` Returns true because we do support a custom editor.

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### GenericObjectEditor

    public GenericObjectEditor()

  Default constructor.

### GenericObjectEditor

    public GenericObjectEditor(boolean canChangeClassInDialog)

  Constructor that allows specifying whether it is possible to change the class within the editor dialog.

  Parameters:
    `canChangeClassInDialog` - whether the user can change the class

Method Detail

### registerEditors

    public static void registerEditors()

  registers all the editors in Weka

### getBackup

    public java.lang.Object getBackup()

  Returns the backup object (may be null if there is no backup).

  Returns:
    the backup object

### sortClassesByRoot

    public static java.util.Hashtable sortClassesByRoot(java.lang.String classes)

  parses the given string of classes separated by ", " and returns the a hashtable with as many entries as there are different root elements in the class names (the key is the root element). E.g. if there's only "weka." as the prefix for all classes the a hashtable of size 1 is returned. if NULL is the input, then NULL is also returned.

  Parameters:
    `classes` - the classnames to work on
  Returns:
    for each distinct root element in the classnames, one entry in the hashtable (with the root element as key)

### setEnabled

    public void setEnabled(boolean newVal)

  Sets whether the editor is "enabled", meaning that the current values will be painted.

  Parameters:
    `newVal` - a value of type 'boolean'

### setClassType

    public void setClassType(java.lang.Class type)

  Sets the class of values that can be edited.

  Parameters:
    `type` - a value of type 'Class'

### setDefaultValue

    public void setDefaultValue()

  Sets the current object to be the default, taken as the first item in the chooser

### setValue

    public void setValue(java.lang.Object o)

  Sets the current Object. If the Object is in the Object chooser, this becomes the selected item (and added to the chooser if necessary).

  Specified by:
    `setValue` in interface `java.beans.PropertyEditor`
  Parameters:
    `o` - an object that must be a Object.

### getValue

    public java.lang.Object getValue()

  Gets the current Object.

  Specified by:
    `getValue` in interface `java.beans.PropertyEditor`
  Returns:
    the current Object

### getJavaInitializationString

    public java.lang.String getJavaInitializationString()

  Supposedly returns an initialization string to create a Object identical to the current one, including it's state, but this doesn't appear possible given that the initialization string isn't supposed to contain multiple statements.

  Specified by:
    `getJavaInitializationString` in interface `java.beans.PropertyEditor`
  Returns:
    the java source code initialisation string

### isPaintable

    public boolean isPaintable()

  Returns true to indicate that we can paint a representation of the Object.

  Specified by:
    `isPaintable` in interface `java.beans.PropertyEditor`
  Returns:
    true

### paintValue

    public void paintValue(java.awt.Graphics gfx,
                           java.awt.Rectangle box)

  Paints a representation of the current Object.

  Specified by:
    `paintValue` in interface `java.beans.PropertyEditor`
  Parameters:
    `gfx` - the graphics context to use
    `box` - the area we are allowed to paint into

### getAsText

    public java.lang.String getAsText()

  Returns null as we don't support getting/setting values as text.

  Specified by:
    `getAsText` in interface `java.beans.PropertyEditor`
  Returns:
    null

### setAsText

    public void setAsText(java.lang.String text)

  Returns null as we don't support getting/setting values as text.

  Specified by:
    `setAsText` in interface `java.beans.PropertyEditor`
  Parameters:
    `text` - the text value
  Throws:
    `java.lang.IllegalArgumentException` - as we don't support getting/setting values as text.

### getTags

    public java.lang.String[] getTags()

  Returns null as we don't support getting values as tags.

  Specified by:
    `getTags` in interface `java.beans.PropertyEditor`
  Returns:
    null

### supportsCustomEditor

    public boolean supportsCustomEditor()

  Returns true because we do support a custom editor.

  Specified by:
    `supportsCustomEditor` in interface `java.beans.PropertyEditor`
  Returns:
    true

### getCustomEditor

    public java.awt.Component getCustomEditor()

  Returns the array editing component.

  Specified by:
    `getCustomEditor` in interface `java.beans.PropertyEditor`
  Returns:
    a value of type 'java.awt.Component'

### addPropertyChangeListener

    public void addPropertyChangeListener(java.beans.PropertyChangeListener l)

  Adds a PropertyChangeListener who will be notified of value changes.

  Specified by:
    `addPropertyChangeListener` in interface `java.beans.PropertyEditor`
  Parameters:
    `l` - a value of type 'PropertyChangeListener'

### removePropertyChangeListener

    public void removePropertyChangeListener(java.beans.PropertyChangeListener l)

  Removes a PropertyChangeListener.

  Specified by:
    `removePropertyChangeListener` in interface `java.beans.PropertyEditor`
  Parameters:
    `l` - a value of type 'PropertyChangeListener'

### getCustomPanel

    public javax.swing.JPanel getCustomPanel()

  Gets the custom panel used for editing the object.

  Specified by:
    `getCustomPanel` in interface `CustomPanelSupplier`
  Returns:
    the custom JPanel

### getChooseClassPopupMenu

    public javax.swing.JPopupMenu getChooseClassPopupMenu()

  Returns a popup menu that allows the user to change the class of object.

  Returns:
    a JPopupMenu that when shown will let the user choose the class

### makeCopy

    public java.lang.Object makeCopy(java.lang.Object source)
                              throws java.lang.Exception

  Makes a copy of an object using serialization

  Parameters:
    `source` - the object to copy
  Returns:
    a copy of the source object
  Throws:
    `java.lang.Exception` - if the copy fails

### main

    public static void main(java.lang.String[] args)

  Tests out the Object editor from the command line.

  Parameters:
    `args` - may contain the class name of a Object to edit

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