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Apache POI - Java API To Access Microsoft Format Files
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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */
package org.apache.poi.hpsf;

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.POIDocument;
import org.apache.poi.poifs.filesystem.EntryUtils;
import org.apache.poi.poifs.filesystem.FilteringDirectoryNode;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

/**
 * A version of {@link POIDocument} which allows access to the
 *  HPSF Properties, but no other document contents.
 * Normally used when you want to read or alter the Document Properties,
 *  without affecting the rest of the file
 */
public class HPSFPropertiesOnlyDocument extends POIDocument {
    public HPSFPropertiesOnlyDocument(POIFSFileSystem fs) {
        super(fs);
    }

    /**
     * Write out to the currently open file the properties changes, but nothing else
     */
    @Override
    public void write() throws IOException {
        POIFSFileSystem fs = getDirectory().getFileSystem();

        validateInPlaceWritePossible();
        writeProperties(fs, null);
        fs.writeFilesystem();
    }
    /**
     * Write out, with any properties changes, but nothing else
     */
    @Override
    public void write(File newFile) throws IOException {
        try (POIFSFileSystem fs = POIFSFileSystem.create(newFile)) {
            write(fs);
            fs.writeFilesystem();
        }
    }
    /**
     * Write out, with any properties changes, but nothing else
     */
    @Override
    public void write(OutputStream out) throws IOException {
        try (POIFSFileSystem fs = new POIFSFileSystem()) {
            write(fs);
            fs.writeFilesystem(out);
        }
    }

    private void write(POIFSFileSystem fs) throws IOException {
        // For tracking what we've written out, so far
        List excepts = new ArrayList<>(2);

        // Write out our HPFS properties, with any changes
        writeProperties(fs, excepts);

        // Copy over everything else unchanged
        FilteringDirectoryNode src = new FilteringDirectoryNode(getDirectory(), excepts);
        FilteringDirectoryNode dest = new FilteringDirectoryNode(fs.getRoot(), excepts);
        EntryUtils.copyNodes(src, dest);

        // Caller will save the resultant POIFSFileSystem to the stream/file
    }
}