Hi Giuseppe,
The document is working with the storage, that means that some parts of
the storage are just locked by other components. This is why for example
the substorages related to the embedded objects can not be opened. They
are already opened by related components for editing and thus are locked.
Please try the following solution to open the substorage:
...
XStorage xAnotherSubStore;
try
{
xAnotherSubStore = xThePackage.openStorageElement(aObjName[i],
ElementModes.READ);
}
catch ( com.sun.star.io.IOException )
{
// the substorage might be locked, get the last commited version of it
xAnotherSubStore = xStorageFactory.createInstance(); // should
create an empty temporary storage
xThePackage.copyStorageElementLastCommitTo( aObjName[i],
xAnotherSubStore );
}
Hope that helps.
Best regards,
Mikhail.
On 04/06/09 15:28, Giuseppe Castagno wrote:
Hi Mikahil,
this is a long message, so please be patient ;-).
Mikhail Voytenko wrote:
Hi,
indeed, the usage of XStorageBasedDocument is the correct approach to
get the storage the document is based on. It allows get the storage
implementation related to the package format. META-INF/manifest.xml
stream is a part of the package format, this is why it can not be
accessed using the package storage implementation.
The streams other than manifest.xml in META-INF should be editable
using this approach, it is a bug if it is not so. The folder can be
handled as a usual substorage in those cases.
The document analyzed is the same in both the simplified code snippets
below, but it's available in full through an anonymous accessible svn
repository, if needed.
In this first example, I can access the whole document storage,
creating a storage object starting from the document URL.
<code>
XComponentContext _xCompCtx)
...
// try from url
Object oObj =
_xMCF.createInstanceWithContext("com.sun.star.embed.StorageFactory",
_xCompCtx);
XSingleServiceFactory xStorageFactory =
(XSingleServiceFactory)UnoRuntime.queryInterface(XSingleServiceFactory.class,oObj);
Object args[]=new Object[2];
args[0] = aTheDocURL;
args[1] = ElementModes.READ;
Object oMyStorage =
xStorageFactory.createInstanceWithArguments(args);
XStorage xThePackage;
xThePackage = (XStorage) UnoRuntime.queryInterface(
XStorage.class, oMyStorage );
....
String sElementName = "";
sElementName = "ObjectReplacements";
XStorage xSubStore = xThePackage.openStorageElement(sElementName,
ElementModes.READ);
// the following function accesses recursively a substorage
fillElementList(xSubStore, aElements,sElementName+"/", do_recurse);
xSubStore.dispose();
....
//Object folders
String aObjectName = new String("Object ");
String[] aObjName = xThePackage.getElementNames();
for(int i = 0; i < aObjName.length; i++) {
sElementName = aObjName[i];
if((aObjName[i].indexOf(aObjectName) != -1) &&
xThePackage.isStorageElement(aObjName[i])) {
XStorage xAnotherSubStore =
xThePackage.openStorageElement(aObjName[i], ElementModes.READ);
fillElementList(xAnotherSubStore,
aElements,aObjName[i]+"/", true);
xAnotherSubStore.dispose();
}
}
</code>
With the above code I got the following correct package structure,
without runtime error:
layout-cache
content.xml
styles.xml
meta.xml
settings.xml
Pictures/10000000000001280000007642983D08.jpg
ObjectReplacements/Object 1
ObjectReplacements/Object 2
ObjectReplacements/Object 3
ObjectReplacements/Object 4
ObjectReplacements/Object 5
ObjectReplacements/Object 6
Object 1/content.xml
Object 1/styles.xml
Object 1/settings.xml
Object 2/content.xml
Object 2/styles.xml
Object 2/settings.xml
Object 3/content.xml
Object 3/styles.xml
Object 3/settings.xml
Object 4/content.xml
Object 4/styles.xml
Object 4/settings.xml
Object 5/content.xml
Object 5/styles.xml
Object 5/settings.xml
Object 6/content.xml
Object 6/styles.xml
Object 6/settings.xml
In the second example I'll use the XStorageBaseDocument to retrieve
the document storage, here it goes.
<code>
// the xModel variable below is the XModel I got in a
// synchronous job when instantiated
// at the load finished event (OnLoad event)
XStorage xStorage = null;
XStorageBasedDocument xDocStorage =
(XStorageBasedDocument)UnoRuntime.queryInterface(
XStorageBasedDocument.class, xModel );
xStorage = xDocStorage.getDocumentStorage();
....
sElementName = "ObjectReplacements";
XStorage xSubStore = xStorage.openStorageElement(sElementName,
ElementModes.READ);
//same function as above
fillElementList(xSubStore, aElements,sElementName+"/", true);
xSubStore.dispose();
....
// now the code is the same as above
//Object folders
String aObjectName = new String("Object ");
String[] aObjName = xStorage.getElementNames();
for(int i = 0; i < aObjName.length; i++) {
sElementName = aObjName[i];
if((aObjName[i].indexOf(aObjectName) != -1) &&
xStorage.isStorageElement(aObjName[i])) {
// the followin line rises an exception, while it shouldn't
// com.sun.star.io.IOException, see below
XStorage xAnotherSubStore =
xStorage.openStorageElement(aObjName[i], ElementModes.READ);
fillElementList(xAnotherSubStore,
aElements,aObjName[i]+"/", true);
xAnotherSubStore.dispose();
}
}
</code>
With the above code I got the following (wrong!) document package
structure:
This package contains the following elements:
layout-cache
content.xml
styles.xml
meta.xml
settings.xml
Pictures/10000000000001280000007642983D08.jpg
ObjectReplacements/Object 1
ObjectReplacements/Object 2
ObjectReplacements/Object 3
ObjectReplacements/Object 4
ObjectReplacements/Object 5
ObjectReplacements/Object 6
As it can be seen, the "Object 1", "Object 2" elements, where the OLE
objects are actually stored, are missing.
Besides I got the following exception:
<log>
it.plio.ext.xades.ooo.pack.DigitalSignatureHelper createElemeList
"Object 1" missing
com.sun.star.io.IOException:
com.sun.star.bridges.jni_uno.JNI_proxy.dispatch_call(Native Method)
com.sun.star.bridges.jni_uno.JNI_proxy.invoke(JNI_proxy.java:178)
$Proxy30.openStorageElement(Unknown Source)
the next line is the one indicated in the above code
it.plio.ext.xades.ooo.pack.DigitalSignatureHelper.makeTheElementList(DigitalSignatureHelper.java:186)
it.plio.ext.xades.ooo.pack.DigitalSignatureHelper.verifyDocumentSignature(DigitalSignatureHelper.java:231)
it.plio.ext.xades.jobs.sync.SyncJob.initThisDocumentURLData(SyncJob.java:699)
it.plio.ext.xades.jobs.sync.SyncJob.execute(SyncJob.java:457)
</log>
I'm afraid it's not something simple to explain...
Thanks, anyway.
BeppeC.
--
Sun Microsystems GmbH Mikhail Voytenko
Nagelsweg 55 Software Engineer
20097 Hamburg Phone: (+49 40)23646 500
Germany Fax: (+49 40)23646 550
http://www.sun.de mailto:mikhail.voite...@sun.com
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