OutputStreamImageOutputStreamSpi.java 文件源码

public ImageOutputStream createOutputStreamInstance(Object output,
                                                    boolean useCache,
                                                    File cacheDir)
    throws IOException {
    if (output instanceof OutputStream) {
        OutputStream os = (OutputStream)output;
        if (useCache) {
            return new FileCacheImageOutputStream(os, cacheDir);
        } else {
            return new MemoryCacheImageOutputStream(os);
        }
    } else {
        throw new IllegalArgumentException();
    }
}