RAFImageInputStreamSpi.java

/*
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 * 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.
 *
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package com.sun.imageio.spi;

import java.io.File;
import java.io.RandomAccessFile;
import java.util.Locale;
import javax.imageio.spi.ImageInputStreamSpi;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.FileImageInputStream;

public class RAFImageInputStreamSpi extends ImageInputStreamSpi {

    private static final String vendorName = "Oracle Corporation";

    private static final String version = "1.0";

    private static final Class<?> inputClass = RandomAccessFile.class;

    public RAFImageInputStreamSpi() {
        super(vendorName, version, inputClass);
    }

    public String getDescription(Locale locale) {
        return "Service provider that instantiates a FileImageInputStream from a RandomAccessFile";
    }

    public ImageInputStream createInputStreamInstance(Object input,
                                                      boolean useCache,
                                                      File cacheDir) {
        if (input instanceof RandomAccessFile) {
            try {
                return new FileImageInputStream((RandomAccessFile)input);
            } catch (Exception e) {
                return null;
            }
        } else {
            throw new IllegalArgumentException
                ("input not a RandomAccessFile!");
        }
    }
}