- /*
- * Copyright 1999-2004 The Apache Software Foundation.
- *
- * Licensed 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,v 1.8 2004/02/11 05:26:23 minchau Exp $
- */
- package com.sun.org.apache.xalan.internal.extensions;
-
- import javax.xml.transform.ErrorListener;
-
- import com.sun.org.apache.xpath.internal.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(com.sun.org.apache.xml.internal.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 com.sun.org.apache.xpath.internal.XPathContext getXPathContext()
- throws javax.xml.transform.TransformerException;
-
- }