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From Thomas P Laford <Thomas_P_Laf...@raytheon.com>
Subject Re: Setting a Linked Property?
Date Mon, 04 Oct 2010 12:13:44 GMT
The following code gives me an "InvalidOperationException: Operation not 
allowed, document open in read only mode!" at the line marked with 
        InputStream pptFileStream = new FileInputStream(pptxInput);
        OPCPackage pkg = OPCPackage.open(pptFileStream);
        XSLFSlideShow ss = new XSLFSlideShow(pkg);
        POIXMLProperties p = ss.getProperties();
        List<CTProperty> properties = 
        for (int i = 0; i < properties.size(); i++)
            if (properties.get(i).getLinkTarget() == null)
                if (properties.get(i).isSetLpwstr())
                    properties.get(i).setLpwstr(" ");
        p.commit();     // **************** Exception Thrown 
        OutputStream out = new FileOutputStream(pptxInput);

This exception appears to occur because the method "public static 
OPCPackage open(InputStream in)" forces the access to READ ONLY.  So I 
tried to change my code to side step the  OPCPackage open() method:
        I replaced this line:
                OPCPackage pkg = OPCPackage.open(pptFileStream);
        with these lines
                OPCPackage pkg = new ZipPackage(pptFileStream, 
But then I discovered that most of the ZipPackage constructors are NOT 
PUBLIC.  The ZipPackage.java source file is missing the PUBLIC keyword on 
two constructors.

So I tried a different OPEN method.
        I replaced this line:
                OPCPackage pkg = OPCPackage.open(pptFileStream);
        with this line
                OPCPackage pkg = 
OPCPackage.open(pptxInput.getAbsolutePath(), PackageAccess.READ_WRITE);

Leaving the rest of the code unchanged, this new line causes a 
NullPointerException at
        POIXMLProperties p = ss.getProperties();

So I removed the two close() calls, and it runs to completion, but it 
corrupts the PPTX file (a 51k file becomes a 3k file).

According to the JavaDoc,
        OPCPackage open(java.io.InputStream in)
loads the whole ZIP file in memory, and
        OPCPackage open(java.lang.String path, PackageAccess access)
does not.  So I presume my 3k file is the dump of an empty data structure.

Any suggestions about what I should try next?
Is there a way to force the ZIP file to be loaded into memory?
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