xtxobject.java

用Java写的面相对象的数据库管理系统

// Copyright 1997-1999 by softwarebuero m&b (SMB). All rights reserved.
//
// You can redistribute this software and/or modify it under the terms of
// the Ozone Library License version 1 published by softwarebuero m&b (SMB).
//
// $Id: XtXObject.java,v 1.2 2000/10/28 16:55:26 daniela Exp $

package org.ozoneDB.xml.xpath;

import java.util.Enumeration;
import java.util.Vector;

import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;


/**
 * Wrapper for the XT XObject and maybe other XPath implementation specific
 * things.
 * @version $Revision: 1.2 $ $Date: 2000/10/28 16:55:26 $
 * @author <a href="http://www.softwarebuero.de">SMB</a>
 */
public final class XtXObject extends java.lang.Object implements XObject {
    
    //
    // Constants
    //
    
    final static long serialVersionUID = 1;
    
    //
    // Data
    //
    
    protected NodeList nodeList;
    
    
    /**
     * Creates a new XtXObject.
     * @param e An Enumeration containing result nodes.
     * @exception IllegalArgumentException If the specified Enumeration was null.
     */
    public XtXObject( Enumeration e ) throws IllegalArgumentException{
        if (e == null) {
            throw new IllegalArgumentException( "XtXObject(): Argument was null!" );
        } 
        nodeList = new NodeListImpl();
        while (e.hasMoreElements()) {
            ((Vector)nodeList).addElement( (Node)e.nextElement() );
        } 
    }
    
    
    /**
     */
    public int getType() {
        return XObject.CLASS_NODESET;
    } 
    
    
    /** Cast result object to a boolean. */
    public boolean bool() throws org.xml.sax.SAXException {
        throw new org.xml.sax.SAXException( "bool(): Not supported!" );
    } 
    
    
    /** Cast result object to a number. */
    public double num() throws org.xml.sax.SAXException {
        throw new org.xml.sax.SAXException( "num(): Not supported!" );
    } 
    
    
    /** Cast result object to a string. */
    public String str() {
        return null;
    } 
    
    
    /** Cast result object to a nodelist. */
    public NodeList nodeset() throws org.xml.sax.SAXException {
        return nodeList;
    } 
    
    
    /** Cast result object to a result tree fragment. */
    public DocumentFragment rtree() {
        return null;
    } 
    
}