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      1 /*
      2  * Licensed to the Apache Software Foundation (ASF) under one
      3  * or more contributor license agreements. See the NOTICE file
      4  * distributed with this work for additional information
      5  * regarding copyright ownership. The ASF licenses this file
      6  * to you under the Apache License, Version 2.0 (the  "License");
      7  * you may not use this file except in compliance with the License.
      8  * You may obtain a copy of the License at
      9  *
     10  *     http://www.apache.org/licenses/LICENSE-2.0
     11  *
     12  * Unless required by applicable law or agreed to in writing, software
     13  * distributed under the License is distributed on an "AS IS" BASIS,
     14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15  * See the License for the specific language governing permissions and
     16  * limitations under the License.
     17  */
     18 /*
     19  * $Id: AttributeIterator.java 468655 2006-10-28 07:12:06Z minchau $
     20  */
     21 package org.apache.xpath.axes;
     22 
     23 import org.apache.xml.dtm.DTM;
     24 import org.apache.xpath.compiler.Compiler;
     25 
     26 /**
     27  * This class implements an optimized iterator for
     28  * attribute axes patterns.
     29  * @see org.apache.xpath.axes#ChildTestIterator
     30  * @xsl.usage advanced
     31  */
     32 public class AttributeIterator extends ChildTestIterator
     33 {
     34     static final long serialVersionUID = -8417986700712229686L;
     35 
     36   /**
     37    * Create a AttributeIterator object.
     38    *
     39    * @param compiler A reference to the Compiler that contains the op map.
     40    * @param opPos The position within the op map, which contains the
     41    * location path expression for this itterator.
     42    *
     43    * @throws javax.xml.transform.TransformerException
     44    */
     45   AttributeIterator(Compiler compiler, int opPos, int analysis)
     46           throws javax.xml.transform.TransformerException
     47   {
     48     super(compiler, opPos, analysis);
     49   }
     50 
     51   /**
     52    * Get the next node via getFirstAttribute && getNextAttribute.
     53    */
     54   protected int getNextNode()
     55   {
     56     m_lastFetched = (DTM.NULL == m_lastFetched)
     57                      ? m_cdtm.getFirstAttribute(m_context)
     58                      : m_cdtm.getNextAttribute(m_lastFetched);
     59     return m_lastFetched;
     60   }
     61 
     62   /**
     63    * Returns the axis being iterated, if it is known.
     64    *
     65    * @return Axis.CHILD, etc., or -1 if the axis is not known or is of multiple
     66    * types.
     67    */
     68   public int getAxis()
     69   {
     70     return org.apache.xml.dtm.Axis.ATTRIBUTE;
     71   }
     72 
     73 
     74 
     75 }
     76