poi/src/java/org/apache/poi/hpsf/SpecialPropertySet.java

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package org.apache.poi.hpsf;

import java.util.List;

/**
 * <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 <a
 * href="mailto:klute@rainer-klute.de">&lt;klute@rainer-klute.de&gt;</a>
 * @version $Id$
 * @since 2002-02-09
 */
public abstract class SpecialPropertySet extends PropertySet
{

    /**
     * <p>The "real" property set <code>SpecialPropertySet</code>
     * delegates to.</p>
     */
    private PropertySet delegate;



    /**
     * <p>Creates a <code>SpecialPropertySet</code>.
     *
     * @param ps The property set encapsulated by the
     * <code>SpecialPropertySet</code>
     */
    public SpecialPropertySet(final PropertySet ps)
    {
        delegate = ps;
    }



    /**
     * @see PropertySet#getByteOrder
     */
    public int getByteOrder()
    {
        return delegate.getByteOrder();
    }



    /**
     * @see PropertySet#getFormat
     */
    public int getFormat()
    {
        return delegate.getFormat();
    }



    /**
     * @see PropertySet#getOSVersion
     */
    public int getOSVersion()
    {
        return delegate.getOSVersion();
    }



    /**
     * @see PropertySet#getClassID
     */
    public ClassID getClassID()
    {
        return delegate.getClassID();
    }



    /**
     * @see PropertySet#getSectionCount
     */
    public int getSectionCount()
    {
        return delegate.getSectionCount();
    }



    /**
     * @see PropertySet#getSections
     */
    public List getSections()
    {
        return delegate.getSections();
    }



    /**
     * @see PropertySet#isSummaryInformation
     */
    public boolean isSummaryInformation()
    {
        return delegate.isSummaryInformation();
    }



    /**
     * @see PropertySet#isDocumentSummaryInformation
     */
    public boolean isDocumentSummaryInformation()
    {
        return delegate.isDocumentSummaryInformation();
    }



    /**
     * @see PropertySet#getSingleSection
     */
    public Section getSingleSection()
    {
        return delegate.getSingleSection();
    }

}