org.apache.poi.hpsf.examples.WriteAuthorAndTitle Maven / Gradle / Ivy
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package org.apache.poi.hpsf.examples;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
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.util.HashMap;
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.MutableSection;
import org.apache.poi.hpsf.NoPropertySetStreamException;
import org.apache.poi.hpsf.PropertySet;
import org.apache.poi.hpsf.PropertySetFactory;
import org.apache.poi.hpsf.SummaryInformation;
import org.apache.poi.hpsf.Util;
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.eventfilesystem.POIFSReaderListener;
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.
*
* @author Rainer Klute <[email protected]>
*/
public class 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.class.getName() +
" 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. */
final POIFSReader r = new POIFSReader();
final ModifySICopyTheRest msrl = new ModifySICopyTheRest(dstName);
r.registerListener(msrl);
r.read(new FileInputStream(srcName));
/* Write the new POIFS to disk. */
msrl.close();
}
/**
* This class does all the work. As its name implies it modifies a
* summary information property set and copies everything else unmodified
* to the destination POI filesystem. Since an instance of it is registered
* as a {@link POIFSReader} its method {@link
* #processPOIFSReaderEvent(POIFSReaderEvent)} is called for each document
* in the origin POIFS.
*/
static class ModifySICopyTheRest implements POIFSReaderListener
{
String dstName;
OutputStream out;
POIFSFileSystem poiFs;
/**
* The constructor of a {@link ModifySICopyTheRest} 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 ModifySICopyTheRest(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. */
}
/* 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())
/* Yes, it is a summary information. We will modify it
* and write the result to the destination POIFS. */
editSI(poiFs, path, name, ps);
else
/* No, it is not a summary information. We don't care
* about its internals and copy it unmodified to the
* destination POIFS. */
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));
}
}
/**
* Receives a summary information property set modifies (or creates)
* its "author" and "title" properties and writes the result under the
* same path and name as the origin to a destination POI filesystem.
*
* @param poiFs The POI filesystem to write to.
* @param path The original (and destination) stream's path.
* @param name The original (and destination) stream's name.
* @param si The property set. It should be a summary information
* property set.
* @throws IOException
* @throws WritingNotSupportedException
*/
public void editSI(final POIFSFileSystem poiFs,
final POIFSDocumentPath path,
final String name,
final PropertySet si)
throws WritingNotSupportedException, IOException
{
/* Get the directory entry for the target stream. */
final DirectoryEntry de = getPath(poiFs, path);
/* Create a mutable property set as a copy of the original read-only
* property set. */
final MutablePropertySet mps = new MutablePropertySet(si);
/* Retrieve the section containing the properties to modify. A
* summary information property set contains exactly one section. */
final MutableSection s =
(MutableSection) mps.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");
/* Create an input stream containing the bytes the property set
* stream consists of. */
final InputStream pss = mps.toInputStream();
/* Write the property set stream to the POIFS. */
de.createDocument(name, pss);
}
/**
* Writes a {@link PropertySet} to a POI filesystem. This method is
* simpler than {@link #editSI} because the origin property set has just
* to be copied.
*
* @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);
}
}
}
}