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133 lines
2.7 KiB
133 lines
2.7 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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/*
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* Copyright 1999-2004 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* $Id: XNull.java,v 1.2.4.1 2005/09/14 20:34:46 jeffsuttor Exp $
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*/
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package com.sun.org.apache.xpath.internal.objects;
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import com.sun.org.apache.xml.internal.dtm.DTM;
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import com.sun.org.apache.xpath.internal.XPathContext;
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/**
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* This class represents an XPath null object, and is capable of
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* converting the null to other types, such as a string.
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* @xsl.usage general
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*/
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public class XNull extends XNodeSet
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{
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static final long serialVersionUID = -6841683711458983005L;
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/**
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* Create an XObject.
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*/
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public XNull()
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{
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super();
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}
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/**
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* Tell what kind of class this is.
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*
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* @return type CLASS_NULL
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*/
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public int getType()
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{
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return CLASS_NULL;
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}
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/**
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* Given a request type, return the equivalent string.
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* For diagnostic purposes.
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*
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* @return type string "#CLASS_NULL"
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*/
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public String getTypeString()
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{
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return "#CLASS_NULL";
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}
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/**
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* Cast result object to a number.
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*
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* @return 0.0
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*/
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public double num()
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{
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return 0.0;
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}
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/**
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* Cast result object to a boolean.
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*
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* @return false
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*/
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public boolean bool()
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{
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return false;
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}
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/**
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* Cast result object to a string.
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*
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* @return empty string ""
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*/
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public String str()
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{
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return "";
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}
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/**
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* Cast result object to a result tree fragment.
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*
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* @param support XPath context to use for the conversion
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*
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* @return The object as a result tree fragment.
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*/
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public int rtf(XPathContext support)
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{
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// DTM frag = support.createDocumentFragment();
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// %REVIEW%
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return DTM.NULL;
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}
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// /**
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// * Cast result object to a nodelist.
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// *
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// * @return null
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// */
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// public DTMIterator iter()
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// {
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// return null;
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// }
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/**
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* Tell if two objects are functionally equal.
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*
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* @param obj2 Object to compare this to
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*
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* @return True if the given object is of type CLASS_NULL
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*/
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public boolean equals(XObject obj2)
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{
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return obj2.getType() == CLASS_NULL;
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}
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}
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