/*
 * Copyright (c) 2006, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
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 class EnumEditor implements PropertyEditor { private final List<PropertyChangeListener> listeners = new ArrayList<PropertyChangeListener>(); private final Class 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; 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 ) { setValue( ( text != null ) ? Enum.valueOf( this.type, text ) : null ); } 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 ); } } }