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: AttributeIterator.java 468655 2006-10-28 07:12:06Z minchau $
020     */
021    package org.apache.xpath.axes;
022    
023    import org.apache.xml.dtm.DTM;
024    import org.apache.xpath.compiler.Compiler;
025    
026    /**
027     * This class implements an optimized iterator for
028     * attribute axes patterns.
029     * @see org.apache.xpath.axes#ChildTestIterator
030     * @xsl.usage advanced
031     */
032    public class AttributeIterator extends ChildTestIterator
033    {
034        static final long serialVersionUID = -8417986700712229686L;
035    
036      /**
037       * Create a AttributeIterator object.
038       *
039       * @param compiler A reference to the Compiler that contains the op map.
040       * @param opPos The position within the op map, which contains the
041       * location path expression for this itterator.
042       *
043       * @throws javax.xml.transform.TransformerException
044       */
045      AttributeIterator(Compiler compiler, int opPos, int analysis)
046              throws javax.xml.transform.TransformerException
047      {
048        super(compiler, opPos, analysis);
049      }
050        
051      /**
052       * Get the next node via getFirstAttribute && getNextAttribute.
053       */
054      protected int getNextNode()
055      {
056        m_lastFetched = (DTM.NULL == m_lastFetched)
057                         ? m_cdtm.getFirstAttribute(m_context)
058                         : m_cdtm.getNextAttribute(m_lastFetched);
059        return m_lastFetched;
060      }
061      
062      /**
063       * Returns the axis being iterated, if it is known.
064       * 
065       * @return Axis.CHILD, etc., or -1 if the axis is not known or is of multiple 
066       * types.
067       */
068      public int getAxis()
069      {
070        return org.apache.xml.dtm.Axis.ATTRIBUTE;
071      }
072    
073    
074    
075    }