org.apache.poi.hpsf.examples.CopyCompare Maven / Gradle / Ivy
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package org.apache.poi.hpsf.examples;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.apache.poi.hpsf.HPSFRuntimeException;
import org.apache.poi.hpsf.MarkUnsupportedException;
import org.apache.poi.hpsf.MutablePropertySet;
import org.apache.poi.hpsf.NoPropertySetStreamException;
import org.apache.poi.hpsf.PropertySet;
import org.apache.poi.hpsf.PropertySetFactory;
import org.apache.poi.hpsf.Util;
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.eventfilesystem.POIFSReaderListener;
import org.apache.poi.poifs.filesystem.DirectoryEntry;
import org.apache.poi.poifs.filesystem.DocumentEntry;
import org.apache.poi.poifs.filesystem.DocumentInputStream;
import org.apache.poi.poifs.filesystem.Entry;
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.MutablePropertySet} from the
* {@link org.apache.poi.hpsf.PropertySet} and writes the
* {@link org.apache.poi.hpsf.MutablePropertySet} 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 attributs, and the sections must contain the same properties.
* Details like the ordering of the properties do not matter.
*
* @author Rainer Klute <[email protected]>
*/
public class 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.
* @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.
* @exception IOException if any I/O exception occurs.
* @exception UnsupportedEncodingException if a character encoding is not
* supported.
*/
public static void main(final String[] args)
throws NoPropertySetStreamException, MarkUnsupportedException,
UnsupportedEncodingException, 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.class.getName() +
"originPOIFS [copyPOIFS]");
System.exit(1);
}
/* Read the origin POIFS using the eventing API. The real work is done
* in the class CopyFile which is registered here as a POIFSReader. */
final POIFSReader r = new POIFSReader();
final CopyFile cf = new CopyFile(copyFileName);
r.registerListener(cf);
r.read(new FileInputStream(originalFileName));
/* Write the new POIFS to disk. */
cf.close();
/* Read all documents from the original POI file system and compare them
* with the equivalent document from the copy. */
final POIFSFileSystem opfs =
new POIFSFileSystem(new FileInputStream(originalFileName));
final POIFSFileSystem cpfs =
new POIFSFileSystem(new FileInputStream(copyFileName));
final DirectoryEntry oRoot = opfs.getRoot();
final DirectoryEntry cRoot = cpfs.getRoot();
final StringBuffer messages = new StringBuffer();
if (equal(oRoot, cRoot, messages))
System.out.println("Equal");
else
System.out.println("Not equal: " + messages.toString());
}
/**
* 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 true if the directories are equal, else
* false.
* @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;
}
/**
* Compares two {@link DocumentEntry} instances of a POI file system.
* Documents that are not property set streams must be bitwise identical.
* Property set streams must be logically equal.
*
* @param d1 The first document.
* @param d2 The second document.
* @param msg The method may append human-readable comparison messages to
* this string buffer.
* @return true if the documents are equal, else
* false.
* @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 DocumentEntry d1, final DocumentEntry d2,
final StringBuffer msg)
throws NoPropertySetStreamException, MarkUnsupportedException,
UnsupportedEncodingException, IOException
{
boolean equal = true;
final DocumentInputStream dis1 = new DocumentInputStream(d1);
final DocumentInputStream dis2 = new DocumentInputStream(d2);
if (PropertySet.isPropertySetStream(dis1) &&
PropertySet.isPropertySetStream(dis2))
{
final PropertySet ps1 = PropertySetFactory.create(dis1);
final PropertySet ps2 = PropertySetFactory.create(dis2);
equal = ps1.equals(ps2);
if (!equal)
{
msg.append("Property sets are not equal.\n");
return equal;
}
}
else
{
int i1;
int i2;
do
{
i1 = dis1.read();
i2 = dis2.read();
if (i1 != i2)
{
equal = false;
msg.append("Documents are not equal.\n");
break;
}
}
while (equal && i1 == -1);
}
return true;
}
/**
* This class does all the work. Its method {@link
* #processPOIFSReaderEvent(POIFSReaderEvent)} is called for each file in
* the original POI file system. Except for property set streams it copies
* everything unmodified to the destination POI filesystem. Property set
* streams are copied by creating a new {@link PropertySet} from the
* original property set by using the {@link
* MutablePropertySet#MutablePropertySet(PropertySet)} constructor.
*/
static class CopyFile implements POIFSReaderListener
{
String dstName;
OutputStream out;
POIFSFileSystem poiFs;
/**
* The constructor of a {@link CopyFile} instance creates the target
* POIFS. It also stores the name of the file the POIFS will be written
* to once it is complete.
*
* @param dstName The name of the disk file the destination POIFS is to
* be written to.
*/
public CopyFile(final String dstName)
{
this.dstName = dstName;
poiFs = new POIFSFileSystem();
}
/**
* The method is called by POI's eventing API for each file in the
* origin POIFS.
*/
public void processPOIFSReaderEvent(final POIFSReaderEvent event)
{
/* The following declarations are shortcuts for accessing the
* "event" object. */
final POIFSDocumentPath path = event.getPath();
final String name = event.getName();
final DocumentInputStream stream = event.getStream();
Throwable t = null;
try
{
/* 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 = null;
try
{
ps = PropertySetFactory.create(stream);
}
catch (NoPropertySetStreamException ex)
{
/* This exception will not be thrown because we already
* checked above. */
}
/* Copy the property set to the destination POI file
* system. */
copy(poiFs, path, name, ps);
}
else
/* No, the current document is not a property set stream. We
* copy it unmodified to the destination POIFS. */
copy(poiFs, event.getPath(), event.getName(), stream);
}
catch (MarkUnsupportedException ex)
{
t = ex;
}
catch (IOException ex)
{
t = ex;
}
catch (WritingNotSupportedException ex)
{
t = ex;
}
/* According to the definition of the processPOIFSReaderEvent method
* we cannot pass checked exceptions to the caller. The following
* lines check whether a checked exception occured and throws an
* unchecked exception. The message of that exception is that of
* the underlying checked exception. */
if (t != null)
{
throw new HPSFRuntimeException
("Could not read file \"" + path + "/" + name +
"\". Reason: " + Util.toString(t));
}
}
/**
* Writes a {@link PropertySet} to a POI filesystem.
*
* @param poiFs The POI filesystem to write to.
* @param path The file's path in the POI filesystem.
* @param name The file's name in the POI filesystem.
* @param ps The property set to write.
* @throws WritingNotSupportedException
* @throws IOException
*/
public void copy(final POIFSFileSystem poiFs,
final POIFSDocumentPath path,
final String name,
final PropertySet ps)
throws WritingNotSupportedException, IOException
{
final DirectoryEntry de = getPath(poiFs, path);
final MutablePropertySet mps = new MutablePropertySet(ps);
de.createDocument(name, mps.toInputStream());
}
/**
* Copies the bytes from a {@link DocumentInputStream} to a new
* stream in a POI filesystem.
*
* @param poiFs The POI filesystem to write to.
* @param path The source document's path.
* @param name The source document's name.
* @param stream The stream containing the source document.
* @throws IOException
*/
public void copy(final POIFSFileSystem poiFs,
final POIFSDocumentPath path,
final String name,
final DocumentInputStream stream) throws IOException
{
final DirectoryEntry de = getPath(poiFs, path);
final ByteArrayOutputStream out = new ByteArrayOutputStream();
int c;
while ((c = stream.read()) != -1)
out.write(c);
stream.close();
out.close();
final InputStream in =
new ByteArrayInputStream(out.toByteArray());
de.createDocument(name, in);
}
/**
* Writes the POI file system to a disk file.
*
* @throws FileNotFoundException
* @throws IOException
*/
public void close() throws FileNotFoundException, IOException
{
out = new FileOutputStream(dstName);
poiFs.writeFilesystem(out);
out.close();
}
/** Contains the directory paths that have already been created in the
* output POI filesystem and maps them to their corresponding
* {@link org.apache.poi.poifs.filesystem.DirectoryNode}s. */
private final Map paths = new HashMap();
/**
* Ensures that the directory hierarchy for a document in a POI
* fileystem is in place. When a document is to be created somewhere in
* a POI filesystem its directory must be created first. This method
* creates all directories between the POI filesystem root and the
* directory the document should belong to which do not yet exist.
*
* Unfortunately POI does not offer a simple method to interrogate
* the POIFS whether a certain child node (file or directory) exists in
* a directory. However, since we always start with an empty POIFS which
* contains the root directory only and since each directory in the
* POIFS is created by this method we can maintain the POIFS's directory
* hierarchy ourselves: The {@link DirectoryEntry} of each directory
* created is stored in a {@link Map}. The directories' path names map
* to the corresponding {@link DirectoryEntry} instances.
*
* @param poiFs The POI filesystem the directory hierarchy is created
* in, if needed.
* @param path The document's path. This method creates those directory
* components of this hierarchy which do not yet exist.
* @return The directory entry of the document path's parent. The caller
* should use this {@link DirectoryEntry} to create documents in it.
*/
public DirectoryEntry getPath(final POIFSFileSystem poiFs,
final POIFSDocumentPath path)
{
try
{
/* Check whether this directory has already been created. */
final String s = path.toString();
DirectoryEntry de = (DirectoryEntry) paths.get(s);
if (de != null)
/* Yes: return the corresponding DirectoryEntry. */
return de;
/* No: We have to create the directory - or return the root's
* DirectoryEntry. */
int l = path.length();
if (l == 0)
/* Get the root directory. It does not have to be created
* since it always exists in a POIFS. */
de = poiFs.getRoot();
else
{
/* Create a subordinate directory. The first step is to
* ensure that the parent directory exists: */
de = getPath(poiFs, path.getParent());
/* Now create the target directory: */
de = de.createDirectory(path.getComponent
(path.length() - 1));
}
paths.put(s, de);
return de;
}
catch (IOException ex)
{
/* This exception will be thrown if the directory already
* exists. However, since we have full control about directory
* creation we can ensure that this will never happen. */
ex.printStackTrace(System.err);
throw new RuntimeException(ex.toString());
/* FIXME (2): Replace the previous line by the following once we
* no longer need JDK 1.3 compatibility. */
// throw new RuntimeException(ex);
}
}
}
}