/**
* Compares two {@link DirectoryEntry} instances of a POI file system. The directories must
* contain the same streams with the same names and contents.
*
* @param d1 The first directory.
* @param d2 The second directory.
* @param msg The method may append human-readable comparison messages to this string buffer.
* @return <code>true</code> if the directories are equal, else <code>false</code>.
* @exception MarkUnsupportedException if a POI document stream does not support the mark()
* operation.
* @exception NoPropertySetStreamException if the application tries to create a property set from
* a POI document stream that is not a property set stream.
* @throws UnsupportedEncodingException
* @exception IOException if any I/O exception occurs.
*/
private static boolean equal(
final DirectoryEntry d1, final DirectoryEntry d2, final StringBuffer msg)
throws NoPropertySetStreamException, MarkUnsupportedException, UnsupportedEncodingException,
IOException {
boolean equal = true;
/* Iterate over d1 and compare each entry with its counterpart in d2. */
for (final Iterator i = d1.getEntries(); equal && i.hasNext(); ) {
final Entry e1 = (Entry) i.next();
final String n1 = e1.getName();
Entry e2 = null;
try {
e2 = d2.getEntry(n1);
} catch (FileNotFoundException ex) {
msg.append("Document \"" + e1 + "\" exists, document \"" + e2 + "\" does not.\n");
equal = false;
break;
}
if (e1.isDirectoryEntry() && e2.isDirectoryEntry())
equal = equal((DirectoryEntry) e1, (DirectoryEntry) e2, msg);
else if (e1.isDocumentEntry() && e2.isDocumentEntry())
equal = equal((DocumentEntry) e1, (DocumentEntry) e2, msg);
else {
msg.append(
"One of \""
+ e1
+ "\" and \""
+ e2
+ "\" is a "
+ "document while the other one is a directory.\n");
equal = false;
}
}
/* Iterate over d2 just to make sure that there are no entries in d2
* that are not in d1. */
for (final Iterator i = d2.getEntries(); equal && i.hasNext(); ) {
final Entry e2 = (Entry) i.next();
final String n2 = e2.getName();
Entry e1 = null;
try {
e1 = d1.getEntry(n2);
} catch (FileNotFoundException ex) {
msg.append("Document \"" + e2 + "\" exitsts, document \"" + e1 + "\" does not.\n");
equal = false;
break;
}
}
return equal;
}
/**
* Is this one of the kinds of formats which uses CompObj to store all of their data, eg Star
* Draw, Star Impress or (older) Works? If not, it's likely an embedded resource
*/
private static MediaType processCompObjFormatType(DirectoryEntry root) {
try {
Entry e = root.getEntry("\u0001CompObj");
if (e != null && e.isDocumentEntry()) {
DocumentNode dn = (DocumentNode) e;
DocumentInputStream stream = new DocumentInputStream(dn);
byte[] bytes = IOUtils.toByteArray(stream);
/*
* This array contains a string with a normal ASCII name of the
* application used to create this file. We want to search for that
* name.
*/
if (arrayContains(bytes, MS_GRAPH_CHART_BYTES)) {
return MS_GRAPH_CHART;
} else if (arrayContains(bytes, STAR_DRAW)) {
return SDA;
} else if (arrayContains(bytes, STAR_IMPRESS)) {
return SDD;
} else if (arrayContains(bytes, WORKS_QUILL96)) {
return WPS;
}
}
} catch (Exception e) {
/*
* "root.getEntry" can throw FileNotFoundException. The code inside
* "if" can throw IOExceptions. Theoretically. Practically no
* exceptions will likely ever appear.
*
* Swallow all of them. If any occur, we just assume that we can't
* distinguish between Draw and Impress and return something safe:
* x-tika-msoffice
*/
}
return OLE;
}
