org.apache.poi.examples.hpsf.WriteAuthorAndTitle Maven / Gradle / Ivy
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package org.apache.poi.examples.hpsf;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.poi.hpsf.HPSFRuntimeException;
import org.apache.poi.hpsf.NoPropertySetStreamException;
import org.apache.poi.hpsf.PropertySet;
import org.apache.poi.hpsf.PropertySetFactory;
import org.apache.poi.hpsf.Section;
import org.apache.poi.hpsf.SummaryInformation;
import org.apache.poi.hpsf.Variant;
import org.apache.poi.hpsf.WritingNotSupportedException;
import org.apache.poi.hpsf.wellknown.PropertyIDMap;
import org.apache.poi.poifs.eventfilesystem.POIFSReader;
import org.apache.poi.poifs.eventfilesystem.POIFSReaderEvent;
import org.apache.poi.poifs.filesystem.DirectoryEntry;
import org.apache.poi.poifs.filesystem.DocumentInputStream;
import org.apache.poi.poifs.filesystem.POIFSDocumentPath;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
/**
* This class is a sample application which shows how to write or modify the
* author and title property of an OLE 2 document. This could be done in two
* different ways:
*
*
*
* The first approach is to open the OLE 2 file as a POI filesystem
* (see class {@link POIFSFileSystem}), read the summary information property
* set (see classes {@link SummaryInformation} and {@link PropertySet}), write
* the author and title properties into it and write the property set back into
* the POI filesystem.
The second approach does not modify the original POI filesystem, but
* instead creates a new one. All documents from the original POIFS are copied
* to the destination POIFS, except for the summary information stream. The
* latter is modified by setting the author and title property before writing
* it to the destination POIFS. It there are several summary information streams
* in the original POIFS - e.g. in subordinate directories - they are modified
* just the same.
*
* This sample application takes the second approach. It expects the name of
* the existing POI filesystem's name as its first command-line parameter and
* the name of the output POIFS as the second command-line argument. The
* program then works as described above: It copies nearly all documents
* unmodified from the input POI filesystem to the output POI filesystem. If it
* encounters a summary information stream it reads its properties. Then it sets
* the "author" and "title" properties to new values and writes the modified
* summary information stream into the output file.
*
* Further explanations can be found in the HPSF HOW-TO.
*/
@SuppressWarnings({"java:S106","java:S4823"})
public final class WriteAuthorAndTitle {
private WriteAuthorAndTitle() {}
/**
* Runs the example program.
*
* @param args Command-line arguments. The first command-line argument must
* be the name of a POI filesystem to read.
* @throws IOException if any I/O exception occurs.
*/
public static void main(final String[] args) throws IOException {
/* Check whether we have exactly two command-line arguments. */
if (args.length != 2) {
System.err.println("Usage: WriteAuthorAndTitle originPOIFS destinationPOIFS");
System.exit(1);
}
/* Read the names of the origin and destination POI filesystems. */
final String srcName = args[0];
final String dstName = args[1];
/* Read the origin POIFS using the eventing API. The real work is done
* in the class ModifySICopyTheRest which is registered here as a
* POIFSReader. */
try (POIFSFileSystem poifs = new POIFSFileSystem();
OutputStream out = new FileOutputStream(dstName)) {
final POIFSReader r = new POIFSReader();
r.registerListener(e -> handleEvent(poifs, e));
r.read(new File(srcName));
/* Write the new POIFS to disk. */
poifs.writeFilesystem(out);
}
}
private interface InputStreamSupplier {
InputStream get() throws IOException, WritingNotSupportedException;
}
/**
* The method is called by POI's eventing API for each file in the origin POIFS.
*/
private static void handleEvent(final POIFSFileSystem poiFs, final POIFSReaderEvent event) {
// The following declarations are shortcuts for accessing the "event" object.
final DocumentInputStream stream = event.getStream();
try {
final InputStreamSupplier isSup;
// Find out whether the current document is a property set stream or not.
if (PropertySet.isPropertySetStream(stream)) {
// Yes, the current document is a property set stream. Let's create a PropertySet instance from it.
PropertySet ps = PropertySetFactory.create(stream);
// Now we know that we really have a property set.
// The next step is to find out whether it is a summary information or not.
if (ps.isSummaryInformation()) {
// Create a mutable property set as a copy of the original read-only property set.
ps = new PropertySet(ps);
// Retrieve the section containing the properties to modify.
// A summary information property set contains exactly one section.
final Section s = ps.getSections().get(0);
// Set the properties.
s.setProperty(PropertyIDMap.PID_AUTHOR, Variant.VT_LPSTR, "Rainer Klute");
s.setProperty(PropertyIDMap.PID_TITLE, Variant.VT_LPWSTR, "Test");
}
isSup = ps::toInputStream;
} else {
// No, the current document is not a property set stream. We copy it unmodified to the destination POIFS.
isSup = event::getStream;
}
try (InputStream is = isSup.get()) {
final POIFSDocumentPath path = event.getPath();
// Ensures that the directory hierarchy for a document in a POI fileystem is in place.
// Get the root directory. It does not have to be created since it always exists in a POIFS.
DirectoryEntry de = poiFs.getRoot();
for (int i=0; i