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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache POI" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache POI", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.poi.poifs.eventfilesystem;
import java.util.*;
import org.apache.poi.poifs.filesystem.DocumentDescriptor;
import org.apache.poi.poifs.filesystem.POIFSDocumentPath;
/**
* A registry for POIFSReaderListeners and the DocumentDescriptors of
* the documents those listeners are interested in
*
* @author Marc Johnson (mjohnson at apache dot org)
* @version %I%, %G%
*/
class POIFSReaderRegistry
{
// the POIFSReaderListeners who listen to all POIFSReaderEvents
private Set omnivorousListeners;
// Each mapping in this Map has a key consisting of a
// POIFSReaderListener and a value cosisting of a Set of
// DocumentDescriptors for the documents that POIFSReaderListener
// is interested in; used to efficiently manage the registry
private Map selectiveListeners;
// Each mapping in this Map has a key consisting of a
// DocumentDescriptor and a value consisting of a Set of
// POIFSReaderListeners for the document matching that
// DocumentDescriptor; used when a document is found, to quickly
// get the listeners interested in that document
private Map chosenDocumentDescriptors;
/**
* Construct the registry
*/
POIFSReaderRegistry()
{
omnivorousListeners = new HashSet();
selectiveListeners = new HashMap();
chosenDocumentDescriptors = new HashMap();
}
/**
* register a POIFSReaderListener for a particular document
*
* @param listener the listener
* @param path the path of the document of interest
* @param documentName the name of the document of interest
*/
void registerListener(final POIFSReaderListener listener,
final POIFSDocumentPath path,
final String documentName)
{
if (!omnivorousListeners.contains(listener))
{
// not an omnivorous listener (if it was, this method is a
// no-op)
Set descriptors = ( Set ) selectiveListeners.get(listener);
if (descriptors == null)
{
// this listener has not registered before
descriptors = new HashSet();
selectiveListeners.put(listener, descriptors);
}
DocumentDescriptor descriptor = new DocumentDescriptor(path,
documentName);
if (descriptors.add(descriptor))
{
// this listener wasn't already listening for this
// document -- add the listener to the set of
// listeners for this document
Set listeners =
( Set ) chosenDocumentDescriptors.get(descriptor);
if (listeners == null)
{
// nobody was listening for this document before
listeners = new HashSet();
chosenDocumentDescriptors.put(descriptor, listeners);
}
listeners.add(listener);
}
}
}
/**
* register for all documents
*
* @param listener the listener who wants to get all documents
*/
void registerListener(final POIFSReaderListener listener)
{
if (!omnivorousListeners.contains(listener))
{
// wasn't already listening for everything, so drop
// anything listener might have been listening for and
// then add the listener to the set of omnivorous
// listeners
removeSelectiveListener(listener);
omnivorousListeners.add(listener);
}
}
/**
* get am iterator of listeners for a particular document
*
* @param path the document path
* @param name the name of the document
*
* @return an Iterator POIFSReaderListeners; may be empty
*/
Iterator getListeners(final POIFSDocumentPath path, final String name)
{
Set rval = new HashSet(omnivorousListeners);
Set selectiveListeners =
( Set ) chosenDocumentDescriptors.get(new DocumentDescriptor(path,
name));
if (selectiveListeners != null)
{
rval.addAll(selectiveListeners);
}
return rval.iterator();
}
private void removeSelectiveListener(final POIFSReaderListener listener)
{
Set selectedDescriptors = ( Set ) selectiveListeners.remove(listener);
if (selectedDescriptors != null)
{
Iterator iter = selectedDescriptors.iterator();
while (iter.hasNext())
{
dropDocument(listener, ( DocumentDescriptor ) iter.next());
}
}
}
private void dropDocument(final POIFSReaderListener listener,
final DocumentDescriptor descriptor)
{
Set listeners = ( Set ) chosenDocumentDescriptors.get(descriptor);
listeners.remove(listener);
if (listeners.size() == 0)
{
chosenDocumentDescriptors.remove(descriptor);
}
}
} // end package scope class POIFSReaderRegistry
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