org.apache.poi.examples.hpsf.CopyCompare 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 java.io.UnsupportedEncodingException;
import org.apache.poi.hpsf.DocumentSummaryInformation;
import org.apache.poi.hpsf.HPSFException;
import org.apache.poi.hpsf.HPSFRuntimeException;
import org.apache.poi.hpsf.PropertySet;
import org.apache.poi.hpsf.PropertySetFactory;
import org.apache.poi.hpsf.SummaryInformation;
import org.apache.poi.hpsf.WritingNotSupportedException;
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.EntryUtils;
import org.apache.poi.poifs.filesystem.POIFSDocumentPath;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.util.TempFile;
/**
* This class copies a POI file system to a new file and compares the copy
* with the original.
*
* Property set streams are copied logically, i.e. the application
* establishes a {@link org.apache.poi.hpsf.PropertySet} of an original property
* set, creates a {@link org.apache.poi.hpsf.PropertySet} and writes the
* {@link org.apache.poi.hpsf.PropertySet} to the destination POI file
* system. - Streams which are no property set streams are copied bit by
* bit.
*
* The comparison of the POI file systems is done logically. That means that
* the two disk files containing the POI file systems do not need to be
* exactly identical. However, both POI file systems must contain the same
* files, and most of these files must be bitwise identical. Property set
* streams, however, are compared logically: they must have the same sections
* with the same attributes, and the sections must contain the same properties.
* Details like the ordering of the properties do not matter.
*/
@SuppressWarnings({"java:S106","java:S4823"})
public final class CopyCompare {
private CopyCompare() {}
/**
* Runs the example program. The application expects one or two arguments:
*
*
* - The first argument is the disk file name of the POI filesystem to copy.
* - The second argument is optional. If it is given, it is the name of
* a disk file the copy of the POI filesystem will be written to. If it is
* not given, the copy will be written to a temporary file which will be
* deleted at the end of the program.
*
*
* @param args Command-line arguments.
* @throws IOException if any I/O exception occurs.
* @throws UnsupportedEncodingException if a character encoding is not
* supported.
*/
public static void main(final String[] args) throws IOException {
String originalFileName = null;
String copyFileName = null;
// Check the command-line arguments.
if (args.length == 1) {
originalFileName = args[0];
File f = TempFile.createTempFile("CopyOfPOIFileSystem-", ".ole2");
f.deleteOnExit();
copyFileName = f.getAbsolutePath();
} else if (args.length == 2) {
originalFileName = args[0];
copyFileName = args[1];
} else {
System.err.println("Usage: CopyCompare originPOIFS [copyPOIFS]");
System.exit(1);
}
boolean result = compare(originalFileName, copyFileName);
System.out.println(result ? "Equal" : "Not equal");
}
public static boolean compare(String originalFileName, String copyFileName) throws IOException {
// Read the origin POIFS using the eventing API.
final POIFSReader r = new POIFSReader();
try (final POIFSFileSystem poiFs = new POIFSFileSystem();
OutputStream fos = new FileOutputStream(copyFileName)) {
r.registerListener(e -> handleEvent(poiFs, e));
r.setNotifyEmptyDirectories(true);
r.read(new File(originalFileName));
// Write the new POIFS to disk.
poiFs.writeFilesystem(fos);
}
// Read all documents from the original POI file system and compare them with
// the equivalent document from the copy.
try (POIFSFileSystem opfs = new POIFSFileSystem(new File(originalFileName));
POIFSFileSystem cpfs = new POIFSFileSystem(new File(copyFileName))) {
final DirectoryEntry oRoot = opfs.getRoot();
final DirectoryEntry cRoot = cpfs.getRoot();
return EntryUtils.areDirectoriesIdentical(oRoot, cRoot);
}
}
private interface InputStreamSupplier {
InputStream get() throws IOException, WritingNotSupportedException;
}
/**
* The method is called by POI's eventing API for each file in the origin POIFS.
*/
public 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 {
// Find out whether the current document is a property set stream or not.
InputStreamSupplier su;
if (stream != null && 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);
// Copy the property set to the destination POI file system.
final PropertySet mps;
if (ps instanceof DocumentSummaryInformation) {
mps = new DocumentSummaryInformation(ps);
} else if (ps instanceof SummaryInformation) {
mps = new SummaryInformation(ps);
} else {
mps = new PropertySet(ps);
}
su = mps::toInputStream;
} else {
// No, the current document is not a property set stream.
// We copy it unmodified to the destination POIFS.
su = event::getStream;
}
try (InputStream is = su.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();
if (File.separator.equals(path.toString())) {
de.setStorageClsid(event.getStorageClassId());
}
for (int i=0; i