| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| /* |
| * $Id$ |
| */ |
| |
| package org.apache.xalan.xsltc.dom; |
| |
| import org.apache.xalan.xsltc.runtime.BasisLibrary; |
| import org.apache.xalan.xsltc.util.IntegerArray; |
| import org.apache.xml.dtm.DTMAxisIterator; |
| import org.apache.xml.dtm.ref.DTMAxisIteratorBase; |
| import org.apache.xml.dtm.ref.DTMDefaultBase; |
| |
| /** |
| * Removes duplicates and sorts a source iterator. The nodes from the |
| * source are collected in an array upon calling setStartNode(). This |
| * array is later sorted and duplicates are ignored in next(). |
| * @author G. Todd Miller |
| */ |
| public final class DupFilterIterator extends DTMAxisIteratorBase { |
| |
| /** |
| * Reference to source iterator. |
| */ |
| private DTMAxisIterator _source; |
| |
| /** |
| * Array to cache all nodes from source. |
| */ |
| private IntegerArray _nodes = new IntegerArray(); |
| |
| /** |
| * Index in _nodes array to current node. |
| */ |
| private int _current = 0; |
| |
| /** |
| * Cardinality of _nodes array. |
| */ |
| private int _nodesSize = 0; |
| |
| /** |
| * Last value returned by next(). |
| */ |
| private int _lastNext = END; |
| |
| /** |
| * Temporary variable to store _lastNext. |
| */ |
| private int _markedLastNext = END; |
| |
| public DupFilterIterator(DTMAxisIterator source) { |
| _source = source; |
| // System.out.println("DFI source = " + source + " this = " + this); |
| |
| // Cache contents of id() or key() index right away. Necessary for |
| // union expressions containing multiple calls to the same index, and |
| // correct as well since start-node is irrelevant for id()/key() exrp. |
| if (source instanceof KeyIndex) { |
| setStartNode(DTMDefaultBase.ROOTNODE); |
| } |
| } |
| |
| /** |
| * Set the start node for this iterator |
| * @param node The start node |
| * @return A reference to this node iterator |
| */ |
| public DTMAxisIterator setStartNode(int node) { |
| if (_isRestartable) { |
| // KeyIndex iterators are always relative to the root node, so there |
| // is never any point in re-reading the iterator (and we SHOULD NOT). |
| boolean sourceIsKeyIndex = _source instanceof KeyIndex; |
| |
| if (sourceIsKeyIndex |
| && _startNode == DTMDefaultBase.ROOTNODE) { |
| return this; |
| } |
| |
| if (node != _startNode) { |
| _source.setStartNode(_startNode = node); |
| |
| _nodes.clear(); |
| while ((node = _source.next()) != END) { |
| _nodes.add(node); |
| } |
| |
| // Nodes produced by KeyIndex are known to be in document order. |
| // Take advantage of it. |
| if (!sourceIsKeyIndex) { |
| _nodes.sort(); |
| } |
| |
| _nodesSize = _nodes.cardinality(); |
| _current = 0; |
| _lastNext = END; |
| resetPosition(); |
| } |
| } |
| return this; |
| } |
| |
| public int next() { |
| while (_current < _nodesSize) { |
| final int next = _nodes.at(_current++); |
| if (next != _lastNext) { |
| return returnNode(_lastNext = next); |
| } |
| } |
| return END; |
| } |
| |
| public DTMAxisIterator cloneIterator() { |
| try { |
| final DupFilterIterator clone = |
| (DupFilterIterator) super.clone(); |
| clone._nodes = (IntegerArray) _nodes.clone(); |
| clone._source = _source.cloneIterator(); |
| clone._isRestartable = false; |
| return clone.reset(); |
| } |
| catch (CloneNotSupportedException e) { |
| BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR, |
| e.toString()); |
| return null; |
| } |
| } |
| |
| public void setRestartable(boolean isRestartable) { |
| _isRestartable = isRestartable; |
| _source.setRestartable(isRestartable); |
| } |
| |
| public void setMark() { |
| _markedNode = _current; |
| _markedLastNext = _lastNext; // Bugzilla 25924 |
| } |
| |
| public void gotoMark() { |
| _current = _markedNode; |
| _lastNext = _markedLastNext; // Bugzilla 25924 |
| } |
| |
| public DTMAxisIterator reset() { |
| _current = 0; |
| _lastNext = END; |
| return resetPosition(); |
| } |
| } |