Determining graphic mime types with Java

I'm still working on my filter and trying to understand how
to extract
graphics from a Writer document in Java. So far, I cannot
find the Java
equivalents to certain parts of the snippet at
http://codesnippets.services.openoffice
.org/Writer/Writer.ExtractGfx.snip

In particular, the closest thing I can find to the
oZipArchive in the
example is XZipFileAccess which I created as follows:
	Object zipArgs[] = new Object[1];
	zipArgs[0] = xSource.getURL();
	XZipFileAccess xZipFileAccess = 
           (XZipFileAccess) UnoRuntime.queryInterface(
			XZipFileAccess.class,
			m_xMCF.createInstanceWithArgumentsAndContext(
				"com.sun.star.packages.zip.ZipFileAccess",
				zipArgs, m_Ctx));
>From a graphic property set I can extract a graphic URL
	String graphicURL = AnyConverter.toString(xGraphicPropSet
				.getPropertyValue("GraphicURL"));
which gives me something like:
vnd.sun.star.GraphicObject:10000000000003590000036584C7606C

I have a gif and a jpg file in the doc I am working on and a
file
Pictures/10000000000003590000036584C7606C.jpg
in the compressed .odt file, so I figure there ought to be
some way of
determining the mime type programatically, but I'm at a
standstill.

If I use
	PropertyValue[] mediaProps = new PropertyValue[1];
	mediaProps[0] = new PropertyValue();
	mediaProps[0].Name = "URL";
	mediaProps[0].Value = graphicURL;
and then 
	XPropertySet xGraphicProps = (XPropertySet) 
		UnoRuntime.queryInterface(XPropertySet.class,
		xGraphicProvider.queryGraphicDescriptor(mediaProps));
The property set claims to have a mimetype property, but it
is an empty
string. I also tried 
	XGraphic xGraphic = (XGraphic)
		UnoRuntime.queryInterface(
			XGraphic.class, 
			xGraphicProvider.queryGraphic(mediaProps));
And got a null XGraphic object returned.

I am able to extract the 10000000000003590000036584C7606C
part of the
above URL and use it to get an XInputStream
String graphicURLPrefix = 
	graphicURL.substring("vnd.sun.star.GraphicObject:"
;.length());
	XInputStream graphicFile = (XInputStream) 
		UnoRuntime.queryInterface(
			XInputStream.class,
			xZipFileAccess.getStreamByPattern("*Pictures/"
			+ graphicURLPrefix + "*"));
from which I can read the file length, so I'm making some
progress,
although I still can't figure out the mime type. 

I'm left with at least two problems.

1) There doesn't seem to be any equivalent in Java/Uno to
the
getByHierarchicalName call used in the snippet. It doesn't
exist in
XZipFileAccess as far as I can see.

2) Is there somethign wrong with the way I set up the media
properties
for the graphics progider query? It seems that the
vnd.sun.star.GraphicObject:10000000000003590000036584C7606C
isn't an
adequate URL or I'm missing something else in the media
properties.

-- 
Ian Shields <iancybershields.com>

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Ian,

In Basic I  used the "DocumentStorage"  and then
out of an  
"InputStream" the MimeType

oPictures =
oDocument.getDocumentStorage.getbyname("Pictures")
mFiles() = oPictures.getElementNames
oOriginalGraphic  = 
getGraphDescritorFromStream(oPictures.getByName(mFiles(j)).g
etInputStream()
oOriginalGraphic.getPropertyValue("MimeType")

I few weeks ago I asked this list for an "URL"  to
the ZipFile, but no 
answer so far 

Hope it helps a bit
Fernand

an Shields schreef:
> I'm still working on my filter and trying to understand
how to extract
> graphics from a Writer document in Java. So far, I
cannot find the Java
> equivalents to certain parts of the snippet at
> http://codesnippets.services.openoffice
.org/Writer/Writer.ExtractGfx.snip
>
> In particular, the closest thing I can find to the
oZipArchive in the
> example is XZipFileAccess which I created as follows:
> 	Object zipArgs[] = new Object[1];
> 	zipArgs[0] = xSource.getURL();
> 	XZipFileAccess xZipFileAccess = 
>            (XZipFileAccess) UnoRuntime.queryInterface(
> 			XZipFileAccess.class,
> 			m_xMCF.createInstanceWithArgumentsAndContext(
>
				"com.sun.star.packages.zip.ZipFileAccess",
> 				zipArgs, m_Ctx));
> >From a graphic property set I can extract a graphic
URL
> 	String graphicURL =
AnyConverter.toString(xGraphicPropSet
> 				.getPropertyValue("GraphicURL"));
> which gives me something like:
>
vnd.sun.star.GraphicObject:10000000000003590000036584C7606C
>
> I have a gif and a jpg file in the doc I am working on
and a file
> Pictures/10000000000003590000036584C7606C.jpg
> in the compressed .odt file, so I figure there ought to
be some way of
> determining the mime type programatically, but I'm at a
standstill.
>
> If I use
> 	PropertyValue[] mediaProps = new PropertyValue[1];
> 	mediaProps[0] = new PropertyValue();
> 	mediaProps[0].Name = "URL";
> 	mediaProps[0].Value = graphicURL;
> and then 
> 	XPropertySet xGraphicProps = (XPropertySet) 
> 		UnoRuntime.queryInterface(XPropertySet.class,
> 		xGraphicProvider.queryGraphicDescriptor(mediaProps));
> The property set claims to have a mimetype property,
but it is an empty
> string. I also tried 
> 	XGraphic xGraphic = (XGraphic)
> 		UnoRuntime.queryInterface(
> 			XGraphic.class, 
> 			xGraphicProvider.queryGraphic(mediaProps));
> And got a null XGraphic object returned.
>
> I am able to extract the
10000000000003590000036584C7606C part of the
> above URL and use it to get an XInputStream
> String graphicURLPrefix = 
>
	graphicURL.substring("vnd.sun.star.GraphicObject:"
;.length());
> 	XInputStream graphicFile = (XInputStream) 
> 		UnoRuntime.queryInterface(
> 			XInputStream.class,
>
			xZipFileAccess.getStreamByPattern("*Pictures/"
> 			+ graphicURLPrefix + "*"));
> from which I can read the file length, so I'm making
some progress,
> although I still can't figure out the mime type. 
>
> I'm left with at least two problems.
>
> 1) There doesn't seem to be any equivalent in Java/Uno
to the
> getByHierarchicalName call used in the snippet. It
doesn't exist in
> XZipFileAccess as far as I can see.
>
> 2) Is there somethign wrong with the way I set up the
media properties
> for the graphics progider query? It seems that the
>
vnd.sun.star.GraphicObject:10000000000003590000036584C7606C
isn't an
> adequate URL or I'm missing something else in the media
properties.
>
>   

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Thanks Fernand.

I tried this tonight but couldn't figure out the
corresponding
interfaces in Java (if they exist). I think I might need an
XDocumentSubStorageSupplier, but it's a mystery to me how I
would create
one.

This area seems to be a hole in both implementation and
documentation. 

On Tue, 2006-11-28 at 18:24 +0100, Fernand Vanrie wrote:
> Ian,
> 
> In Basic I  used the "DocumentStorage"  and
then out of an  
> "InputStream" the MimeType
> 
> oPictures =
oDocument.getDocumentStorage.getbyname("Pictures")
> mFiles() = oPictures.getElementNames
> oOriginalGraphic  = 
>
getGraphDescritorFromStream(oPictures.getByName(mFiles(j)).g
etInputStream()
> oOriginalGraphic.getPropertyValue("MimeType")
> 
> I few weeks ago I asked this list for an
"URL"  to the ZipFile, but no 
> answer so far 
> 
> Hope it helps a bit
> Fernand

-- 
Ian Shields <iancybershields.com>

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Ian Shields schreef:
> Thanks Fernand.
>
> I tried this tonight but couldn't figure out the
corresponding
> interfaces in Java (if they exist). I think I might
need an
> XDocumentSubStorageSupplier, but it's a mystery to me
how I would create
> one.
>   
Do you uses the "ObjectInspector":  
http://api.openoffice.org/Projects/ObjectIns
pector/Inspector.uno.pkg

I now nothing about Java but after selecting the pictures I
found a lot 
of info about the "SubStorage"
> This area seems to be a hole in both implementation and
documentation. 
>
> On Tue, 2006-11-28 at 18:24 +0100, Fernand Vanrie
wrote:
>   
>> Ian,
>>
>> In Basic I  used the "DocumentStorage" 
and then out of an  
>> "InputStream" the MimeType
>>
>> oPictures =
oDocument.getDocumentStorage.getbyname("Pictures")
>> mFiles() = oPictures.getElementNames
>> oOriginalGraphic  = 
>>
getGraphDescritorFromStream(oPictures.getByName(mFiles(j)).g
etInputStream()
>>
oOriginalGraphic.getPropertyValue("MimeType")
>>
>> I few weeks ago I asked this list for an
"URL"  to the ZipFile, but no 
>> answer so far 
>>
>> Hope it helps a bit
>> Fernand
>>     
>
>   

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