| /* |
| * 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.AbstractTranslet; |
| 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; |
| |
| /** |
| * Iterators of this kind use a CurrentNodeListFilter to filter a subset of |
| * nodes from a source iterator. For each node from the source, the boolean |
| * method CurrentNodeListFilter.test() is called. |
| * |
| * All nodes from the source are read into an array upon calling setStartNode() |
| * (this is needed to determine the value of last, a parameter to |
| * CurrentNodeListFilter.test()). The method getLast() returns the last element |
| * after applying the filter. |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| * @author Morten Jorgensen |
| */ |
| |
| public final class CurrentNodeListIterator extends DTMAxisIteratorBase { |
| /** |
| * A flag indicating if nodes are returned in document order. |
| */ |
| private boolean _docOrder; |
| |
| /** |
| * The source for this iterator. |
| */ |
| private DTMAxisIterator _source; |
| |
| /** |
| * A reference to a filter object. |
| */ |
| private final CurrentNodeListFilter _filter; |
| |
| /** |
| * An integer array to store nodes from source iterator. |
| */ |
| private IntegerArray _nodes = new IntegerArray(); |
| |
| /** |
| * Index in _nodes of the next node to filter. |
| */ |
| private int _currentIndex; |
| |
| /** |
| * The current node in the stylesheet at the time of evaluation. |
| */ |
| private final int _currentNode; |
| |
| /** |
| * A reference to the translet. |
| */ |
| private AbstractTranslet _translet; |
| |
| public CurrentNodeListIterator(DTMAxisIterator source, |
| CurrentNodeListFilter filter, |
| int currentNode, |
| AbstractTranslet translet) |
| { |
| this(source, !source.isReverse(), filter, currentNode, translet); |
| } |
| |
| public CurrentNodeListIterator(DTMAxisIterator source, boolean docOrder, |
| CurrentNodeListFilter filter, |
| int currentNode, |
| AbstractTranslet translet) |
| { |
| _source = source; |
| _filter = filter; |
| _translet = translet; |
| _docOrder = docOrder; |
| _currentNode = currentNode; |
| } |
| |
| public DTMAxisIterator forceNaturalOrder() { |
| _docOrder = true; |
| return this; |
| } |
| |
| public void setRestartable(boolean isRestartable) { |
| _isRestartable = isRestartable; |
| _source.setRestartable(isRestartable); |
| } |
| |
| public boolean isReverse() { |
| return !_docOrder; |
| } |
| |
| public DTMAxisIterator cloneIterator() { |
| try { |
| final CurrentNodeListIterator clone = |
| (CurrentNodeListIterator) 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 DTMAxisIterator reset() { |
| _currentIndex = 0; |
| return resetPosition(); |
| } |
| |
| public int next() { |
| final int last = _nodes.cardinality(); |
| final int currentNode = _currentNode; |
| final AbstractTranslet translet = _translet; |
| |
| for (int index = _currentIndex; index < last; ) { |
| final int position = _docOrder ? index + 1 : last - index; |
| final int node = _nodes.at(index++); // note increment |
| |
| if (_filter.test(node, position, last, currentNode, translet, |
| this)) { |
| _currentIndex = index; |
| return returnNode(node); |
| } |
| } |
| return END; |
| } |
| |
| public DTMAxisIterator setStartNode(int node) { |
| if (_isRestartable) { |
| _source.setStartNode(_startNode = node); |
| |
| _nodes.clear(); |
| while ((node = _source.next()) != END) { |
| _nodes.add(node); |
| } |
| _currentIndex = 0; |
| resetPosition(); |
| } |
| return this; |
| } |
| |
| public int getLast() { |
| if (_last == -1) { |
| _last = computePositionOfLast(); |
| } |
| return _last; |
| } |
| |
| public void setMark() { |
| _markedNode = _currentIndex; |
| } |
| |
| public void gotoMark() { |
| _currentIndex = _markedNode; |
| } |
| |
| private int computePositionOfLast() { |
| final int last = _nodes.cardinality(); |
| final int currNode = _currentNode; |
| final AbstractTranslet translet = _translet; |
| |
| int lastPosition = _position; |
| for (int index = _currentIndex; index < last; ) { |
| final int position = _docOrder ? index + 1 : last - index; |
| int nodeIndex = _nodes.at(index++); // note increment |
| |
| if (_filter.test(nodeIndex, position, last, currNode, translet, |
| this)) { |
| lastPosition++; |
| } |
| } |
| return lastPosition; |
| } |
| } |