package com.wutka.dtd;import java.util.*;import java.io.*;/** Represents a parsed Document Type Definition * * @author Mark Wutka * @version $Revision: 1.16 $ $Date: 2002/07/19 01:20:11 $ by $Author: wutka $ */public class DTD implements DTDOutput{/** Contains all the elements defined in the DTD */    public Hashtable elements;/** Contains all the entities defined in the DTD */    public Hashtable entities;/** Contains all the notations defined in the DTD */    public Hashtable notations;/** Contains parsed DTD's for any external entity DTD declarations */    public Hashtable externalDTDs;/** Contains all the items defined in the DTD in their original order */    public Vector items;/** Contains the element that is most likely the root element  or null    if the root element can't be determined.  */    public DTDElement rootElement;/** Creates a new DTD */    public DTD()    {        elements = new Hashtable();        entities = new Hashtable();        notations = new Hashtable();        externalDTDs = new Hashtable();        items = new Vector();    }/** Writes the DTD to an output writer in standard DTD format (the format *  the parser normally reads). *  @param outWriter The writer where the DTD will be written */    public void write(PrintWriter outWriter)        throws IOException    {        Enumeration e = items.elements();        while (e.hasMoreElements())        {            DTDOutput item = (DTDOutput) e.nextElement();            item.write(outWriter);        }    }/** Returns true if this object is equal to another */    public boolean equals(Object ob)    {        if (this == ob) return true;        if (!(ob instanceof DTD)) return false;        DTD otherDTD = (DTD) ob;        return items.equals(otherDTD.items);    }/** Stores an array of items in the items array */    public void setItems(Object[] newItems)    {        items = new Vector(newItems.length);        for (int i=0; i < newItems.length; i++)        {            items.addElement(newItems[i]);        }    }/** Returns the items as an array */    public Object[] getItems()    {        return items.toArray();    }/** Stores an item in the items array */    public void setItem(Object item, int i)    {        items.setElementAt(item, i);    }/** Retrieves an item from the items array */    public Object getItem(int i)    {        return items.elementAt(i);    }/** Retrieves a list of items of a particular type */    public Vector getItemsByType(Class itemType)    {        Vector results = new Vector();        Enumeration e = items.elements();        while (e.hasMoreElements())        {            Object ob = e.nextElement();            if (itemType.isAssignableFrom(ob.getClass()))            {                results.addElement(ob);            }        }        return results;    }}