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1
61
62
63
64 package org.jaxen.util;
65
66 import java.util.Iterator  ;
67 import java.util.LinkedList ;
68 import java.util.NoSuchElementException ;
69
70 import org.jaxen.JaxenConstants;
71 import org.jaxen.Navigator;
72 import org.jaxen.UnsupportedAxisException;
73
74 public class PrecedingSiblingAxisIterator implements Iterator
75 {
76 private Object contextNode;
77 private Navigator navigator;
78
79 private Iterator siblingIter;
80 private Object nextObj;
81
82 public PrecedingSiblingAxisIterator(Object contextNode,
83 Navigator navigator) throws UnsupportedAxisException
84 {
85 this.contextNode = contextNode;
86 this.navigator = navigator;
87
88 init();
89 if ( siblingIter.hasNext() )
90 {
91 this.nextObj = siblingIter.next();
92 }
93 }
94
95 private void init() throws UnsupportedAxisException
96 {
97
98 Object parent = this.navigator.getParentNode( this.contextNode );
99
100 if ( parent != null )
101 {
102 Iterator childIter = this.navigator.getChildAxisIterator( parent );
103 LinkedList siblings = new LinkedList ();
104
105 while ( childIter.hasNext() )
106 {
107 Object eachChild = childIter.next();
108 if ( eachChild.equals(this.contextNode) )
109 {
110 break;
111 }
112 siblings.addFirst( eachChild );
113 }
114
115 this.siblingIter = siblings.iterator();
116
117 }
118 else {
119 this.siblingIter = JaxenConstants.EMPTY_ITERATOR;
120 }
121
122 }
123
124 public boolean hasNext()
125 {
126 return ( this.nextObj != null );
127 }
128
129 public Object next() throws NoSuchElementException
130 {
131 if ( ! hasNext() )
132 {
133 throw new NoSuchElementException ();
134 }
135
136 Object obj = this.nextObj;
137 if ( siblingIter.hasNext() )
138 {
139 this.nextObj = siblingIter.next();
140 }
141 else {
142 this.nextObj = null;
143 }
144 return obj;
145 }
146
147 public void remove() throws UnsupportedOperationException
148 {
149 throw new UnsupportedOperationException ();
150 }
151
152 }
153 |
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