- /*
- * 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.xalan.extensions;
-
- import org.w3c.dom.traversal.NodeIterator;
- import org.w3c.dom.Node;
- import org.apache.xpath.objects.XObject;
- import javax.xml.transform.ErrorListener;
-
- /**
- * 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;
-
- }