| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 1999-2003 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.xalan.extensions; |
| |
| import javax.xml.transform.ErrorListener; |
| |
| import org.apache.xpath.objects.XObject; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.traversal.NodeIterator; |
| |
| /** |
| * An object that implements this interface can supply |
| * information about the current XPath expression context. |
| */ |
| public interface ExpressionContext |
| { |
| |
| /** |
| * Get the current context node. |
| * @return The current context node. |
| */ |
| public Node getContextNode(); |
| |
| /** |
| * Get the current context node list. |
| * @return An iterator for the current context list, as |
| * defined in XSLT. |
| */ |
| public NodeIterator getContextNodes(); |
| |
| /** |
| * Get the error listener. |
| * @return The registered error listener. |
| */ |
| public ErrorListener getErrorListener(); |
| |
| /** |
| * Get the value of a node as a number. |
| * @param n Node to be converted to a number. May be null. |
| * @return value of n as a number. |
| */ |
| public double toNumber(Node n); |
| |
| /** |
| * Get the value of a node as a string. |
| * @param n Node to be converted to a string. May be null. |
| * @return value of n as a string, or an empty string if n is null. |
| */ |
| public String toString(Node n); |
| |
| /** |
| * Get a variable based on it's qualified name. |
| * |
| * @param qname The qualified name of the variable. |
| * |
| * @return The evaluated value of the variable. |
| * |
| * @throws javax.xml.transform.TransformerException |
| */ |
| public XObject getVariableOrParam(org.apache.xml.utils.QName qname) |
| throws javax.xml.transform.TransformerException; |
| |
| /** |
| * Get the XPathContext that owns this ExpressionContext. |
| * |
| * Note: exslt:function requires the XPathContext to access |
| * the variable stack and TransformerImpl. |
| * |
| * @return The current XPathContext. |
| * @throws javax.xml.transform.TransformerException |
| */ |
| public org.apache.xpath.XPathContext getXPathContext() |
| throws javax.xml.transform.TransformerException; |
| |
| } |