JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1997, 2013, 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
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 */

package javax.swing.plaf;

import java.awt.Component;
import java.awt.Graphics;
import java.io.Serializable;
import javax.swing.Icon;
import javax.swing.plaf.UIResource;

/**
 * An Icon wrapper class which implements UIResource.  UI
 * classes which set icon properties should use this class
 * to wrap any icons specified as defaults.
 *
 * This class delegates all method invocations to the
 * Icon "delegate" object specified at construction.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @see javax.swing.plaf.UIResource
 * @author Amy Fowler
 *
 */
public class IconUIResource implements Icon, UIResource, Serializable
{
    private Icon delegate;

    /**
     * Creates a UIResource icon object which wraps
     * an existing Icon instance.
     * @param delegate the icon being wrapped
     */
    public IconUIResource(Icon delegate) {
        if (delegate == null) {
            throw new IllegalArgumentException("null delegate icon argument");
        }
        this.delegate = delegate;

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