JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1995, 1996, 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 sun.awt.image;

import java.io.InputStream;
import java.io.FileInputStream;
import java.io.BufferedInputStream;
import java.io.FileNotFoundException;

public class FileImageSource extends InputStreamImageSource {
    String imagefile;

    public FileImageSource(String filename) {
        SecurityManager security = System.getSecurityManager();
        if (security != null) {
            security.checkRead(filename);
        }
        imagefile = filename;
    }

    final boolean checkSecurity(Object context, boolean quiet) {
        // File based images only ever need to be checked statically
        // when the image is retrieved from the cache.
        return true;
    }

    protected ImageDecoder getDecoder() {
        if (imagefile == null) {
            return null;
        }

        InputStream is;
        try {
            is = new BufferedInputStream(new FileInputStream(imagefile));
        } catch (FileNotFoundException e) {
            return null;
        }
        // Don't believe the file suffix - many users don't know what
        // kind of image they have and guess wrong...
        /*
        int suffixpos = imagefile.lastIndexOf('.');
        if (suffixpos >= 0) {
            String suffix = imagefile.substring(suffixpos+1).toLowerCase();
            if (suffix.equals("gif")) {
                return new GifImageDecoder(this, is);
            } else if (suffix.equals("jpeg") || suffix.equals("jpg") ||

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