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Java API to handle Microsoft OLE 2 Compound Document format (Word, Excel). Based on poi-2.5.1-final-20040804.jar, with bugfixes for OLE v2 and memory efficiency improvements. Used by Bio-Formats for OLE support (cxd, ipw, oib, zvi). Used by VisBio overlays logic for XLS export feature.
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/*
 * #%L
 * Fork of Apache Jakarta POI.
 * %%
 * Copyright (C) 2008 - 2016 Open Microscopy Environment:
 *   - Board of Regents of the University of Wisconsin-Madison
 *   - Glencoe Software, Inc.
 *   - University of Dundee
 * %%
 * Licensed 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.
 * #L%
 */

/* ====================================================================
   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 loci.poi.poifs.filesystem;

import java.io.*;

import java.util.*;

import loci.common.*;

import loci.poi.hpsf.ClassID;
import loci.poi.util.*;

/**
 * This interface defines methods specific to Directory objects
 * managed by a Filesystem instance.
 *
 * @author Marc Johnson (mjohnson at apache dot org)
 */

public interface DirectoryEntry
    extends Entry
{

    /**
     * get an iterator of the Entry instances contained directly in
     * this instance (in other words, children only; no grandchildren
     * etc.)
     *
     * @return iterator; never null, but hasNext() may return false
     *         immediately (i.e., this DirectoryEntry is empty). All
     *         objects retrieved by next() are guaranteed to be
     *         implementations of Entry.
     */

    public Iterator getEntries();

    /**
     * is this DirectoryEntry empty?
     *
     * @return true if this instance contains no Entry instances
     */

    public boolean isEmpty();

    /**
     * find out how many Entry instances are contained directly within
     * this DirectoryEntry
     *
     * @return number of immediately (no grandchildren etc.) contained
     *         Entry instances
     */

    public int getEntryCount();

    /**
     * get a specified Entry by name
     *
     * @param name the name of the Entry to obtain.
     *
     * @return the specified Entry, if it is directly contained in
     *         this DirectoryEntry
     *
     * @exception FileNotFoundException if no Entry with the specified
     *            name exists in this DirectoryEntry
     */

    public Entry getEntry(final String name)
        throws FileNotFoundException;

    /**
     * create a new DocumentEntry
     *
     * @param name the name of the new DocumentEntry
     * @param stream the InputStream from which to create the new
     *               DocumentEntry
     *
     * @return the new DocumentEntry
     *
     * @exception IOException
     */

    public DocumentEntry createDocument(final String name,
                                        final RandomAccessInputStream stream)
        throws IOException;

    /**
     * create a new DocumentEntry; the data will be provided later
     *
     * @param name the name of the new DocumentEntry
     * @param size the size of the new DocumentEntry
     * @param writer the writer of the new DocumentEntry
     *
     * @return the new DocumentEntry
     *
     * @exception IOException
     */

    public DocumentEntry createDocument(final String name, final int size,
                                        final POIFSWriterListener writer)
        throws IOException;

    /**
     * create a new DirectoryEntry
     *
     * @param name the name of the new DirectoryEntry
     *
     * @return the new DirectoryEntry
     *
     * @exception IOException
     */

    public DirectoryEntry createDirectory(final String name)
        throws IOException;

    /**
     * Gets the storage clsid of the directory entry
     *
     * @return storage Class ID
     */
    public ClassID getStorageClsid();

    /**
     * Sets the storage clsid for the directory entry
     *
     * @param clsidStorage storage Class ID
     */
    public void setStorageClsid(ClassID clsidStorage);

}   // end public interface DirectoryEntry