| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 1999 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Xalan" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation and was |
| * originally based on software copyright (c) 1999, Lotus |
| * Development Corporation., http://www.lotus.com. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| package org.apache.xpath.functions; |
| |
| import javax.xml.transform.TransformerException; |
| |
| import org.apache.xalan.res.XSLMessages; |
| import org.apache.xalan.res.XSLTErrorResources; |
| import org.apache.xml.dtm.DTMSequence; |
| import org.apache.xpath.XPathContext; |
| import org.apache.xpath.objects.XObject; |
| import org.apache.xpath.objects.XJavaObject; |
| |
| /** |
| * <meta name="usage" content="advanced"/> |
| * Execute the data() function. Not supported before |
| * XPath/XSLT 2.0. |
| */ |
| public class FuncData extends FunctionOneArg |
| { |
| /** |
| * Execute the function. The function must return |
| * a valid object. |
| * @param xctxt The current execution context. |
| * @return A valid XObject. |
| * |
| * @throws javax.xml.transform.TransformerException |
| */ |
| public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException |
| { |
| XObject src=m_arg0.execute(xctxt); |
| |
| // /* This should have been checked at stylesheet build, |
| // * and hence ought to be superfluous. |
| // * %REVIEW% %OPT% |
| // * */ |
| // if("1.0".equals(xctxt.getXPathVersion())) |
| // { |
| // xctxt.getErrorListener().error( |
| // new TransformerException( |
| // XSLMessages.createMessage(XSLTErrorResources.ER_NOT_SUPPORTED, |
| // new Object[]{"XSLT 2.0 data()"}), |
| // xctxt.getSAXLocator())); |
| // //"Illegal value for xml:space", locator)); |
| // // If error listener returns... |
| // return src; |
| // } |
| |
| if(src.getType()==src.CLASS_NODESET) |
| { |
| int sourceHandle=src.iter().item(0); |
| |
| if(sourceHandle==org.apache.xml.dtm.DTM.NULL) |
| return /*new XJavaObject*/(org.apache.xpath.objects.XSequence.EMPTY); |
| |
| org.apache.xml.dtm.DTM sourceDTM=xctxt.getDTM(sourceHandle); |
| |
| DTMSequence seq=sourceDTM.getTypedValue(sourceHandle); |
| |
| // %TODO% Other kinds of objects? |
| return new org.apache.xpath.objects.XDTMSequence(seq); |
| } |
| |
| // %TODO% %REVIEW% See issues 80, 81, 231, .... |
| // There seem to be some conflicts here. |
| // |
| // "Consensus is to define data() on only singleton node and empty sequence" |
| // "Open issue as to whether data() should be defined on node sequences." |
| // "NB: Current definition of data() applied to a text node is the empty sequence." |
| // "data() applied to simple value is identity function (no-op)" |
| // |
| // "xf:data(): decided that it should return the error object when applied to document, PI, |
| // comment and namespace nodes." (What is "the error object"?) |
| |
| else return src; // %TODO% Awaiting typed non-nodes... |
| } |
| |
| } |