[imaging] Closing stream

[Gary Gregory]

Hi All:

I see a log of this pattern:

            try {
                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (final Exception e) {
                Debug.debug(e);
            }

for example in org.apache.commons.imaging.Imaging:

    public static void writeImage(final BufferedImage src, final File file,
            final ImageFormat format, final Map<String,Object> params)
throws ImageWriteException,
            IOException {
        OutputStream os = null;

        try {
            os = new FileOutputStream(file);
            os = new BufferedOutputStream(os);

            writeImage(src, os, format, params);
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
            } catch (final Exception e) {
                Debug.debug(e);
            }
        }
    }

Which seems wrong to me. If I get an IOE while writing, we throw, but if we
get one when flushing and closing the file (which may also write), we
swallow it. Why? It seems the IOE from close should percolate up and not be
swallowed.

All of this is moot in Java 7 with try-with-resources blocks but we are not
ready for Java 7 here I imagine.

Gary
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