specialpropertyset.java

Office格式转换代码

/*
 *  ====================================================================
 *  The Apache Software License, Version 1.1
 *
 *  Copyright (c) 2000 The Apache Software Foundation.  All rights
 *  reserved.
 *
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 *  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.
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 *  notice, this list of conditions and the following disclaimer in
 *  the documentation and/or other materials provided with the
 *  distribution.
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 *  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.
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 *  not be used to endorse or promote products derived from this
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 *
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package org.apache.poi.hpsf;

import java.util.*;
import org.apache.poi.util.LittleEndian;

/**
 * <p>Abstract superclass for the convenience classes {@link
 * SummaryInformation} and {@link DocumentSummaryInformation}.</p>
 *
 * <p>The motivation behind this class is quite nasty if you look
 * behind the scenes, but it serves the application programmer well by
 * providing him with the easy-to-use {@link SummaryInformation} and
 * {@link DocumentSummaryInformation} classes. When parsing the data a
 * property set stream consists of (possibly coming from an {@link
 * java.io.InputStream}) we want to read and process each byte only
 * once. Since we don't know in advance which kind of property set we
 * have, we can expect only the most general {@link
 * PropertySet}. Creating a special subclass should be as easy as
 * calling the special subclass' constructor and pass the general
 * {@link PropertySet} in. To make things easy internally, the special
 * class just holds a reference to the general {@link PropertySet} and
 * delegates all method calls to it.</p>
 *
 * <p>A cleaner implementation would have been like this: The {@link
 * PropertySetFactory} parses the stream data into some internal
 * object first.  Then it finds out whether the stream is a {@link
 * SummaryInformation}, a {@link DocumentSummaryInformation} or a
 * general {@link PropertySet}.  However, the current implementation
 * went the other way round historically: the convenience classes came
 * only late to my mind.</p>
 *
 * @author Rainer Klute ([e-mail])
 * @version $Id: SpecialPropertySet.java,v 1.8 2003/02/22 14:27:16 klute Exp $
 * @since 2002-02-09
 */
public abstract class SpecialPropertySet extends PropertySet
{

    private PropertySet delegate;



    public SpecialPropertySet(PropertySet ps)
    {
        delegate = ps;
    }



    public int getByteOrder()
    {
        return delegate.getByteOrder();
    }



    public int getFormat()
    {
        return delegate.getFormat();
    }



    /*
     * This is intentionally no javadoc comment.
     *
     * FIXME: Return an <code>int</code> instead of a
     * <code>long</code> in the next major version, i.e. when
     * incompatible changes are allowed.
     */
    public long getOSVersion()
    {
        return delegate.getOSVersion();
    }



    public ClassID getClassID()
    {
        return delegate.getClassID();
    }



    /*
     * This is intentionally no javadoc comment.
     *
     * FIXME: Return an <code>int</code> instead of a
     * <code>long</code> in the next major version, i.e. when
     * incompatible changes are allowed.
     */
    public long getSectionCount()
    {
        return delegate.getSectionCount();
    }



    public List getSections()
    {
        return delegate.getSections();
    }



    public boolean isSummaryInformation()
    {
        return delegate.isSummaryInformation();
    }



    public boolean isDocumentSummaryInformation()
    {
        return delegate.isDocumentSummaryInformation();
    }



    public Section getSingleSection()
    {
        return delegate.getSingleSection();
    }

}