documentproperty.java

Office格式转换代码

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003 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 [e-mail].
 *
 * 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.property;

import org.apache.poi.poifs.filesystem.POIFSDocument;

/**
 * Trivial extension of Property for POIFSDocuments
 *
 * @author Marc Johnson (mjohnson at apache dot org)
 */

public class DocumentProperty
    extends Property
{

    // the POIFSDocument this property is associated with
    private POIFSDocument _document;

    /**
     * Constructor
     *
     * @param name POIFSDocument name
     * @param size POIFSDocument size
     */

    public DocumentProperty(final String name, final int size)
    {
        super();
        _document = null;
        setName(name);
        setSize(size);
        setNodeColor(_NODE_BLACK);   // simplification
        setPropertyType(PropertyConstants.DOCUMENT_TYPE);
    }

    /**
     * reader constructor
     *
     * @param index index number
     * @param array byte data
     * @param offset offset into byte data
     */

    protected DocumentProperty(final int index, final byte [] array,
                               final int offset)
    {
        super(index, array, offset);
        _document = null;
    }

    /**
     * set the POIFSDocument
     *
     * @param doc the associated POIFSDocument
     */

    public void setDocument(POIFSDocument doc)
    {
        _document = doc;
    }

    /**
     * get the POIFSDocument
     *
     * @return the associated document
     */

    public POIFSDocument getDocument()
    {
        return _document;
    }

    /* ********** START extension of Property ********** */

    /**
     * give method more visibility
     *
     * @return true if this property should use small blocks
     */

    public boolean shouldUseSmallBlocks()
    {
        return super.shouldUseSmallBlocks();
    }

    /**
     * @return true if a directory type Property
     */

    public boolean isDirectory()
    {
        return false;
    }

    /**
     * Perform whatever activities need to be performed prior to
     * writing
     */

    protected void preWrite()
    {

        // do nothing
    }

    /* **********  END  extension of Property ********** */
}   // end public class DocumentProperty