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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: DTMAxisIterator.java 468653 2006-10-28 07:07:05Z minchau $
20  */
21 package org.apache.xml.dtm;
22 
23 /**
24  * This class iterates over a single XPath Axis, and returns node handles.
25  */
26 public interface DTMAxisIterator extends Cloneable
27 {
28 
29   /** Specifies the end of the iteration, and is the same as DTM.NULL.  */
30   public static final int END = DTM.NULL;
31 
32   /**
33    * Get the next node in the iteration.
34    *
35    * @return The next node handle in the iteration, or END.
36    */
next()37   public int next();
38 
39 
40   /**
41    * Resets the iterator to the last start node.
42    *
43    * @return A DTMAxisIterator, which may or may not be the same as this
44    *         iterator.
45    */
reset()46   public DTMAxisIterator reset();
47 
48   /**
49    * @return the number of nodes in this iterator.  This may be an expensive
50    * operation when called the first time.
51    */
getLast()52   public int getLast();
53 
54   /**
55    * @return The position of the current node in the set, as defined by XPath.
56    */
getPosition()57   public int getPosition();
58 
59   /**
60    * Remembers the current node for the next call to gotoMark().
61    */
setMark()62   public void setMark();
63 
64   /**
65    * Restores the current node remembered by setMark().
66    */
gotoMark()67   public void gotoMark();
68 
69   /**
70    * Set start to END should 'close' the iterator,
71    * i.e. subsequent call to next() should return END.
72    *
73    * @param node Sets the root of the iteration.
74    *
75    * @return A DTMAxisIterator set to the start of the iteration.
76    */
setStartNode(int node)77   public DTMAxisIterator setStartNode(int node);
78 
79   /**
80    * Get start to END should 'close' the iterator,
81    * i.e. subsequent call to next() should return END.
82    *
83    * @return The root node of the iteration.
84    */
getStartNode()85   public int getStartNode();
86 
87   /**
88    * @return true if this iterator has a reversed axis, else false.
89    */
isReverse()90   public boolean isReverse();
91 
92   /**
93    * @return a deep copy of this iterator. The clone should not be reset
94    * from its current position.
95    */
cloneIterator()96   public DTMAxisIterator cloneIterator();
97 
98   /**
99    * Set if restartable.
100    */
setRestartable(boolean isRestartable)101   public void setRestartable(boolean isRestartable);
102 
103   /**
104    * Return the node at the given position.
105    *
106    * @param position The position
107    * @return The node at the given position.
108    */
getNodeByPosition(int position)109   public int getNodeByPosition(int position);
110 }
111