Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (c) 2002, 2010, 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.
 */

import javax.swing.*;

import sun.swing.ImageIconUIResource;

import java.io.*;

public class Main {
    /**
     * Utility method that creates a <code>UIDefaults.LazyValue</code> that
     * creates an <code>ImageIcon</code> <code>UIResource</code> for the
     * specified image file name. The image is loaded using
     * <code>getResourceAsStream</code>, starting with a call to that method
     * on the base class parameter. If it cannot be found, searching will
     * continue through the base class' inheritance hierarchy, up to and
     * including <code>rootClass</code>.
     *
     * @param baseClass the first class to use in searching for the resource
     * @param rootClass an ancestor of <code>baseClass</code> to finish the
     *                  search at
     * @param imageFile the name of the file to be found
     * @return a lazy value that creates the <code>ImageIcon</code>
     *         <code>UIResource</code> for the image,
     *         or null if it cannot be found
     */
    public static Object makeIcon(final Class<?> baseClass, final Class<?> rootClass, final String imageFile) {

        return new UIDefaults.LazyValue() {
            public Object createValue(UIDefaults table) {
                /* Copy resource into a byte array.  This is
                 * necessary because several browsers consider
                 * Class.getResource a security risk because it
                 * can be used to load additional classes.
                 * Class.getResourceAsStream just returns raw
                 * bytes, which we can convert to an image.
                 */
                byte[] buffer = java.security.AccessController
                        .doPrivileged(new java.security.PrivilegedAction<byte[]>() {
                            public byte[] run() {
                                try {
                                    InputStream resource = null;
                                    Class<?> srchClass = baseClass;

                                    while (srchClass != null) {
                                        resource = srchClass.getResourceAsStream(imageFile);

                                        if (resource != null || srchClass == rootClass) {
                                            break;
                                        }

                                        srchClass = srchClass.getSuperclass();
                                    }

                                    if (resource == null) {
                                        return null;
                                    }

                                    BufferedInputStream in = new BufferedInputStream(resource);
                                    ByteArrayOutputStream out = new ByteArrayOutputStream(1024);
                                    byte[] buffer = new byte[1024];
                                    int n;
                                    while ((n = in.read(buffer)) > 0) {
                                        out.write(buffer, 0, n);
                                    }
                                    in.close();
                                    out.flush();
                                    return out.toByteArray();
                                } catch (IOException ioe) {
                                    System.err.println(ioe.toString());
                                }
                                return null;
                            }
                        });

                if (buffer == null) {
                    return null;
                }
                if (buffer.length == 0) {
                    System.err.println("warning: " + imageFile + " is zero-length");
                    return null;
                }

                return new ImageIconUIResource(buffer);
            }
        };
    }
}