144 lines
4.5 KiB
Java
144 lines
4.5 KiB
Java
/*
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* Copyright (c) 2006, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.beans.editors;
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import java.awt.Component;
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import java.awt.Graphics;
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import java.awt.Rectangle;
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import java.beans.PropertyChangeEvent;
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import java.beans.PropertyChangeListener;
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import java.beans.PropertyEditor;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* Property editor for java.lang.Enum subclasses.
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*
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* @see PropertyEditor
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*
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* @since 1.7
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*
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* @author Sergey A. Malenkov
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*/
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public final class EnumEditor implements PropertyEditor {
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private final List<PropertyChangeListener> listeners = new ArrayList<PropertyChangeListener>();
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private final Class type;
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private final String[] tags;
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private Object value;
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public EnumEditor( Class type ) {
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Object[] values = type.getEnumConstants();
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if ( values == null ) {
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throw new IllegalArgumentException( "Unsupported " + type );
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}
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this.type = type;
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this.tags = new String[values.length];
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for ( int i = 0; i < values.length; i++ ) {
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this.tags[i] = ( ( Enum )values[i] ).name();
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}
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}
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public Object getValue() {
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return this.value;
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}
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public void setValue( Object value ) {
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if ( ( value != null ) && !this.type.isInstance( value ) ) {
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throw new IllegalArgumentException( "Unsupported value: " + value );
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}
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Object oldValue;
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PropertyChangeListener[] listeners;
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synchronized ( this.listeners ) {
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oldValue = this.value;
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this.value = value;
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if ( ( value == null ) ? oldValue == null : value.equals( oldValue ) ) {
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return; // do not fire event if value is not changed
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}
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int size = this.listeners.size();
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if ( size == 0 ) {
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return; // do not fire event if there are no any listener
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}
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listeners = this.listeners.toArray( new PropertyChangeListener[size] );
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}
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PropertyChangeEvent event = new PropertyChangeEvent( this, null, oldValue, value );
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for ( PropertyChangeListener listener : listeners ) {
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listener.propertyChange( event );
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}
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}
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public String getAsText() {
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return ( this.value != null )
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? ( ( Enum )this.value ).name()
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: null;
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}
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public void setAsText( String text ) {
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setValue( ( text != null )
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? Enum.valueOf( this.type, text )
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: null );
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}
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public String[] getTags() {
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return this.tags.clone();
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}
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public String getJavaInitializationString() {
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String name = getAsText();
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return ( name != null )
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? this.type.getName() + '.' + name
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: "null";
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}
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public boolean isPaintable() {
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return false;
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}
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public void paintValue( Graphics gfx, Rectangle box ) {
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}
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public boolean supportsCustomEditor() {
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return false;
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}
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public Component getCustomEditor() {
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return null;
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}
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public void addPropertyChangeListener( PropertyChangeListener listener ) {
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synchronized ( this.listeners ) {
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this.listeners.add( listener );
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}
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}
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public void removePropertyChangeListener( PropertyChangeListener listener ) {
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synchronized ( this.listeners ) {
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this.listeners.remove( listener );
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}
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}
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}
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