001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements. See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership. The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the  "License");
007     * you may not use this file except in compliance with the License.
008     * You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    /*
019     * $Id: SubContextList.java 468655 2006-10-28 07:12:06Z minchau $
020     */
021    package org.apache.xpath.axes;
022    
023    import org.apache.xpath.XPathContext;
024     
025    /**
026     * A class that implements this interface is a sub context node list, meaning it
027     * is a node list for a location path step for a predicate.
028     * @xsl.usage advanced
029     */
030    public interface SubContextList
031    {
032    
033      /**
034       * Get the number of nodes in the node list, which, in the XSLT 1 based 
035       * counting system, is the last index position.
036       *
037       *
038       * @param xctxt The XPath runtime context.
039       *
040       * @return the number of nodes in the node list.
041       */
042      public int getLastPos(XPathContext xctxt);
043    
044      /**
045       * Get the current sub-context position.
046       *
047       * @param xctxt The XPath runtime context.
048       *
049       * @return The position of the current node in the list.
050       */
051      public int getProximityPosition(XPathContext xctxt);
052    }