| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| /* |
| * $Id: ExpressionContext.java 468637 2006-10-28 06:51:02Z minchau $ |
| */ |
| 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; |
| |
| } |