/*
* Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package java.beans;
import java.beans.*;
/**
* This is a support class to help build property editors.
* <p>
* It can be used either as a base class or as a delegate.
*/
public class
PropertyEditorSupport implements
PropertyEditor {
/**
* Constructs a <code>PropertyEditorSupport</code> object.
*
* @since 1.5
*/
public
PropertyEditorSupport() {
setSource(this);
}
/**
* Constructs a <code>PropertyEditorSupport</code> object.
*
* @param source the source used for event firing
* @since 1.5
*/
public
PropertyEditorSupport(
Object source) {
if (
source == null) {
throw new
NullPointerException();
}
setSource(
source);
}
/**
* Returns the bean that is used as the
* source of events. If the source has not
* been explicitly set then this instance of
* <code>PropertyEditorSupport</code> is returned.
*
* @return the source object or this instance
* @since 1.5
*/
public
Object getSource() {
return
source;
}
/**
* Sets the source bean.
* <p>
* The source bean is used as the source of events
* for the property changes. This source should be used for information
* purposes only and should not be modified by the PropertyEditor.
*
* @param source source object to be used for events
* @since 1.5
*/
public void
setSource(
Object source) {
this.
source =
source;
}
/**
* Set (or change) the object that is to be edited.
*
* @param value The new target object to be edited. Note that this
* object should not be modified by the PropertyEditor, rather
* the PropertyEditor should create a new object to hold any
* modified value.
*/
public void
setValue(
Object value) {
this.
value =
value;
firePropertyChange();
}
/**
* Gets the value of the property.
*
* @return The value of the property.
*/
public
Object getValue() {
return
value;
}
//----------------------------------------------------------------------
/**
* Determines whether the class will honor the paintValue method.
*
* @return True if the class will honor the paintValue method.
*/
public boolean
isPaintable() {
return false;
}
/**
* Paint a representation of the value into a given area of screen
* real estate. Note that the propertyEditor is responsible for doing
* its own clipping so that it fits into the given rectangle.
* <p>
* If the PropertyEditor doesn't honor paint requests (see isPaintable)
* this method should be a silent noop.
*
* @param gfx Graphics object to paint into.
* @param box Rectangle within graphics object into which we should paint.
*/
public void
paintValue(java.awt.
Graphics gfx, java.awt.
Rectangle box) {
}
//----------------------------------------------------------------------
/**
* This method is intended for use when generating Java code to set
* the value of the property. It should return a fragment of Java code
* that can be used to initialize a variable with the current property
* value.
* <p>
* Example results are "2", "new Color(127,127,34)", "Color.orange", etc.
*
* @return A fragment of Java code representing an initializer for the
* current value.
*/
public
String getJavaInitializationString() {
return "???";
}
//----------------------------------------------------------------------
/**
* Gets the property value as a string suitable for presentation
* to a human to edit.
*
* @return The property value as a string suitable for presentation
* to a human to edit.
* <p> Returns null if the value can't be expressed as a string.
* <p> If a non-null value is returned, then the PropertyEditor should
* be prepared to parse that string back in setAsText().
*/
public
String getAsText() {
return (this.
value != null)
? this.
value.
toString()
: null;
}
/**
* Sets the property value by parsing a given String. May raise
* java.lang.IllegalArgumentException if either the String is
* badly formatted or if this kind of property can't be expressed
* as text.
*
* @param text The string to be parsed.
*/
public void
setAsText(
String text) throws java.lang.
IllegalArgumentException {
if (
value instanceof
String) {
setValue(
text);
return;
}
throw new java.lang.
IllegalArgumentException(
text);
}
//----------------------------------------------------------------------
/**
* If the property value must be one of a set of known tagged values,
* then this method should return an array of the tag values. This can
* be used to represent (for example) enum values. If a PropertyEditor
* supports tags, then it should support the use of setAsText with
* a tag value as a way of setting the value.
*
* @return The tag values for this property. May be null if this
* property cannot be represented as a tagged value.
*
*/
public
String[]
getTags() {
return null;
}
//----------------------------------------------------------------------
/**
* A PropertyEditor may chose to make available a full custom Component
* that edits its property value. It is the responsibility of the
* PropertyEditor to hook itself up to its editor Component itself and
* to report property value changes by firing a PropertyChange event.
* <P>
* The higher-level code that calls getCustomEditor may either embed
* the Component in some larger property sheet, or it may put it in
* its own individual dialog, or ...
*
* @return A java.awt.Component that will allow a human to directly
* edit the current property value. May be null if this is
* not supported.
*/
public java.awt.
Component getCustomEditor() {
return null;
}
/**
* Determines whether the propertyEditor can provide a custom editor.
*
* @return True if the propertyEditor can provide a custom editor.
*/
public boolean
supportsCustomEditor() {
return false;
}
//----------------------------------------------------------------------
/**
* Adds a listener for the value change.
* When the property editor changes its value
* it should fire a {@link PropertyChangeEvent}
* on all registered {@link PropertyChangeListener}s,
* specifying the {@code null} value for the property name.
* If the source property is set,
* it should be used as the source of the event.
* <p>
* The same listener object may be added more than once,
* and will be called as many times as it is added.
* If {@code listener} is {@code null},
* no exception is thrown and no action is taken.
*
* @param listener the {@link PropertyChangeListener} to add
*/
public synchronized void
addPropertyChangeListener(
PropertyChangeListener listener) {
if (
listeners == null) {
listeners = new java.util.
Vector<>();
}
listeners.
addElement(
listener);
}
/**
* Removes a listener for the value change.
* <p>
* If the same listener was added more than once,
* it will be notified one less time after being removed.
* If {@code listener} is {@code null}, or was never added,
* no exception is thrown and no action is taken.
*
* @param listener the {@link PropertyChangeListener} to remove
*/
public synchronized void
removePropertyChangeListener(
PropertyChangeListener listener) {
if (
listeners == null) {
return;
}
listeners.
removeElement(
listener);
}
/**
* Report that we have been modified to any interested listeners.
*/
public void
firePropertyChange() {
java.util.
Vector<
PropertyChangeListener>
targets;
synchronized (this) {
if (
listeners == null) {
return;
}
targets =
unsafeClone(
listeners);
}
// Tell our listeners that "everything" has changed.
PropertyChangeEvent evt = new
PropertyChangeEvent(
source, null, null, null);
for (int
i = 0;
i <
targets.
size();
i++) {
PropertyChangeListener target =
targets.
elementAt(
i);
target.
propertyChange(
evt);
}
}
@
SuppressWarnings("unchecked")
private <T> java.util.
Vector<T>
unsafeClone(java.util.
Vector<T>
v) {
return (java.util.
Vector<T>)
v.
clone();
}
//----------------------------------------------------------------------
private
Object value;
private
Object source;
private java.util.
Vector<
PropertyChangeListener>
listeners;
}