org.apache.poi.poifs.property.PropertyFactory Maven / Gradle / Ivy
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this work for additional information regarding copyright ownership.
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package org.apache.poi.poifs.property;
import java.io.IOException;
import java.util.*;
import org.apache.poi.poifs.common.POIFSConstants;
import org.apache.poi.poifs.storage.ListManagedBlock;
/**
* Factory for turning an array of RawDataBlock instances containing
* Proprty data into an array of proper Property objects.
*
* The array produced may be sparse, in that any portion of data that
* should correspond to a Property, but which does not map to a proper
* Property (i.e., a DirectoryProperty, DocumentProperty, or
* RootProperty) will get mapped to a null Property in the array.
*
* @author Marc Johnson (mjohnson at apache dot org)
*/
class PropertyFactory
{
// no need for an accessible constructor
private PropertyFactory()
{
}
/**
* Convert raw data blocks to an array of Property's
*
* @param blocks to be converted
*
* @return the converted List of Property objects. May contain
* nulls, but will not be null
*
* @exception IOException if any of the blocks are empty
*/
static List convertToProperties(ListManagedBlock [] blocks)
throws IOException
{
List properties = new ArrayList();
for (int j = 0; j < blocks.length; j++)
{
byte[] data = blocks[ j ].getData();
int property_count = data.length
/ POIFSConstants.PROPERTY_SIZE;
int offset = 0;
for (int k = 0; k < property_count; k++)
{
switch (data[ offset + PropertyConstants.PROPERTY_TYPE_OFFSET ])
{
case PropertyConstants.DIRECTORY_TYPE :
properties
.add(new DirectoryProperty(properties.size(),
data, offset));
break;
case PropertyConstants.DOCUMENT_TYPE :
properties.add(new DocumentProperty(properties.size(),
data, offset));
break;
case PropertyConstants.ROOT_TYPE :
properties.add(new RootProperty(properties.size(),
data, offset));
break;
default :
properties.add(null);
break;
}
offset += POIFSConstants.PROPERTY_SIZE;
}
}
return properties;
}
} // end package scope class PropertyFactory