1 /* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5 /* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22 package com.sun.org.apache.xalan.internal.xsltc.dom; 23 24 import com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary; 25 import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator; 26 import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase; 27 28 /** 29 * @author Jacek Ambroziak 30 * @author Morten Jorgensen 31 */ 32 public final class NthIterator extends DTMAxisIteratorBase { 33 // ...[N] 34 private DTMAxisIterator _source; 35 private final int _position; 36 private boolean _ready; 37 38 public NthIterator(DTMAxisIterator source, int n) { 39 _source = source; 40 _position = n; 41 } 42 43 public void setRestartable(boolean isRestartable) { 44 _isRestartable = isRestartable; 45 _source.setRestartable(isRestartable); 46 } 47 48 public DTMAxisIterator cloneIterator() { 49 try { 50 final NthIterator clone = (NthIterator) super.clone(); 51 clone._source = _source.cloneIterator(); // resets source 52 clone._isRestartable = false; 53 return clone; 54 } 55 catch (CloneNotSupportedException e) { 56 BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR, 57 e.toString()); 58 return null; 59 } 60 } 61 62 public int next() { 63 if (_ready) { 64 _ready = false; 65 return _source.getNodeByPosition(_position); 66 } 67 return DTMAxisIterator.END; 68 /* 69 if (_ready && _position > 0) { 70 final int pos = _source.isReverse() 71 ? _source.getLast() - _position + 1 72 : _position; 73 74 _ready = false; 75 int node; 76 while ((node = _source.next()) != DTMAxisIterator.END) { 77 if (pos == _source.getPosition()) { 78 return node; 79 } 80 } 81 } 82 return DTMAxisIterator.END; 83 */ 84 } 85 86 public DTMAxisIterator setStartNode(final int node) { 87 if (_isRestartable) { 88 _source.setStartNode(node); 89 _ready = true; 90 } 91 return this; 92 } 93 94 public DTMAxisIterator reset() { 95 _source.reset(); 96 _ready = true; 97 return this; 98 } 99 100 public int getLast() { 101 return 1; 102 } 103 104 public int getPosition() { 105 return 1; 106 } 107 108 public void setMark() { 109 _source.setMark(); 110 } 111 112 public void gotoMark() { 113 _source.gotoMark(); 114 } 115 }