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package com.sun.beans.editors;

import java.awt.Component;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyEditor;
import java.util.ArrayList;
import java.util.List;

Property editor for java.lang.Enum subclasses.
Author:Sergey A. Malenkov
See Also:
  • PropertyEditor
Since:1.7
/** * Property editor for java.lang.Enum subclasses. * * @see PropertyEditor * * @since 1.7 * * @author Sergey A. Malenkov */
public final class EnumEditor implements PropertyEditor { private final List<PropertyChangeListener> listeners = new ArrayList<PropertyChangeListener>(); @SuppressWarnings("rawtypes") private final Class<? extends Enum> type; private final String[] tags; private Object value; public EnumEditor(Class<?> type) { Object[] values = type.getEnumConstants(); if ( values == null ) { throw new IllegalArgumentException( "Unsupported " + type ); } this.type = type.asSubclass(java.lang.Enum.class); this.tags = new String[values.length]; for ( int i = 0; i < values.length; i++ ) { this.tags[i] = ( ( Enum )values[i] ).name(); } } public Object getValue() { return this.value; } public void setValue( Object value ) { if ( ( value != null ) && !this.type.isInstance( value ) ) { throw new IllegalArgumentException( "Unsupported value: " + value ); } Object oldValue; PropertyChangeListener[] listeners; synchronized ( this.listeners ) { oldValue = this.value; this.value = value; if ( ( value == null ) ? oldValue == null : value.equals( oldValue ) ) { return; // do not fire event if value is not changed } int size = this.listeners.size(); if ( size == 0 ) { return; // do not fire event if there are no any listener } listeners = this.listeners.toArray( new PropertyChangeListener[size] ); } PropertyChangeEvent event = new PropertyChangeEvent( this, null, oldValue, value ); for ( PropertyChangeListener listener : listeners ) { listener.propertyChange( event ); } } public String getAsText() { return ( this.value != null ) ? ( ( Enum )this.value ).name() : null; } public void setAsText( String text ) { @SuppressWarnings("unchecked") Object tmp = ( text != null ) ? Enum.valueOf( (Class)this.type, text ) : null; setValue(tmp); } public String[] getTags() { return this.tags.clone(); } public String getJavaInitializationString() { String name = getAsText(); return ( name != null ) ? this.type.getName() + '.' + name : "null"; } public boolean isPaintable() { return false; } public void paintValue( Graphics gfx, Rectangle box ) { } public boolean supportsCustomEditor() { return false; } public Component getCustomEditor() { return null; } public void addPropertyChangeListener( PropertyChangeListener listener ) { synchronized ( this.listeners ) { this.listeners.add( listener ); } } public void removePropertyChangeListener( PropertyChangeListener listener ) { synchronized ( this.listeners ) { this.listeners.remove( listener ); } } }