xalanxobject.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: XalanXObject.java,v 1.3 2000/10/28 16:55:26 daniela Exp $

package org.ozoneDB.xml.xpath;

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

import org.xml.sax.SAXException;

import org.apache.xalan.xpath.XObject;

/**
 * Wrapper for the Xalan XObject and maybe other XPath implementation specific
 * things.
 * 
 * This class only compiles if you have a working Xalan 1.0.1 in your classpath!
 * 
 * 
 * @version $Revision: 1.3 $ $Date: 2000/10/28 16:55:26 $
 * @author <a href="http://www.softwarebuero.de">SMB</a>
 */
public final class XalanXObject extends java.lang.Object implements org.ozoneDB.xml.xpath.XObject {
    
    //
    // Constants
    //
    
    private org.apache.xalan.xpath.XObject _xobj = null;
    
    
    /**
     * Creates a new XalanXObject.
     * @param xobj Xalans native XObject that should be wrapped.
     * @exception IllegalArgumentException If the given XObject was null.
     */
    public XalanXObject( XObject xobj ) throws IllegalArgumentException{
        if (xobj == null) {
            throw new IllegalArgumentException( "XalanXObject(): Argument was null!" );
        } 
        _xobj = xobj;
    }
    
    
    /** Tell what kind of class this is. */
    public int getType() {
        switch (_xobj.getType()) {
        case org.apache.xalan.xpath.XObject.CLASS_BOOLEAN:
            return org.ozoneDB.xml.xpath.XObject.CLASS_BOOLEAN;
        case org.apache.xalan.xpath.XObject.CLASS_NODESET:
            return org.ozoneDB.xml.xpath.XObject.CLASS_NODESET;
        case org.apache.xalan.xpath.XObject.CLASS_NULL:
            return org.ozoneDB.xml.xpath.XObject.CLASS_NULL;
        case org.apache.xalan.xpath.XObject.CLASS_NUMBER:
            return org.ozoneDB.xml.xpath.XObject.CLASS_NUMBER;
        case org.apache.xalan.xpath.XObject.CLASS_RTREEFRAG:
            return org.ozoneDB.xml.xpath.XObject.CLASS_RTREEFRAG;
        case org.apache.xalan.xpath.XObject.CLASS_STRING:
            return org.ozoneDB.xml.xpath.XObject.CLASS_STRING;
        case org.apache.xalan.xpath.XObject.CLASS_UNKNOWN:
            return org.ozoneDB.xml.xpath.XObject.CLASS_UNKNOWN;
        }
        return org.ozoneDB.xml.xpath.XObject.CLASS_UNKNOWN;
    } 
    
    
    /** Cast result object to a boolean. */
    public boolean bool() throws org.xml.sax.SAXException {
        return _xobj.bool();
    } 
    
    
    /** Cast result object to a number. */
    public double num() throws org.xml.sax.SAXException {
        return _xobj.num();
    } 
    
    
    /** Cast result object to a string. */
    public String str() {
        return _xobj.str();
    } 
    
    
    /** Cast result object to a nodelist. */
    public NodeList nodeset() throws org.xml.sax.SAXException {
        return _xobj.nodeset();
    } 
    
    
    /** Cast result object to a result tree fragment. */
    public DocumentFragment rtree() {
        return _xobj.rtree();
    } 
    
}