- /*
- * Copyright 2001-2004 The Apache Software Foundation.
- *
- * Licensed 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: StepIterator.java,v 1.15 2004/02/16 22:54:59 minchau Exp $
- */
-
- package com.sun.org.apache.xalan.internal.xsltc.dom;
-
- import com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary;
- import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
- import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase;
-
- /**
- * A step iterator is used to evaluate expressions like "BOOK/TITLE".
- * A better name for this iterator would have been ParentIterator since
- * both "BOOK" and "TITLE" are steps in XPath lingo. Step iterators are
- * constructed from two other iterators which we are going to refer to
- * as "outer" and "inner". Every node from the outer iterator (the one
- * for BOOK in our example) is used to initialize the inner iterator.
- * After this initialization, every node from the inner iterator is
- * returned (in essence, implementing a "nested loop").
- * @author Jacek Ambroziak
- * @author Santiago Pericas-Geertsen
- * @author Erwin Bolwidt <ejb@klomp.org>
- * @author Morten Jorgensen
- */
- public class StepIterator extends DTMAxisIteratorBase {
-
- /**
- * A reference to the "outer" iterator.
- */
- protected DTMAxisIterator _source;
-
- /**
- * A reference to the "inner" iterator.
- */
- protected DTMAxisIterator _iterator;
-
- /**
- * Temp variable to store a marked position.
- */
- private int _pos = -1;
-
- public StepIterator(DTMAxisIterator source, DTMAxisIterator iterator) {
- _source = source;
- _iterator = iterator;
- // System.out.println("SI source = " + source + " this = " + this);
- // System.out.println("SI iterator = " + iterator + " this = " + this);
- }
-
-
- public void setRestartable(boolean isRestartable) {
- _isRestartable = isRestartable;
- _source.setRestartable(isRestartable);
- _iterator.setRestartable(true); // must be restartable
- }
-
- public DTMAxisIterator cloneIterator() {
- _isRestartable = false;
- try {
- final StepIterator clone = (StepIterator) super.clone();
- clone._source = _source.cloneIterator();
- clone._iterator = _iterator.cloneIterator();
- clone._iterator.setRestartable(true); // must be restartable
- clone._isRestartable = false;
- return clone.reset();
- }
- catch (CloneNotSupportedException e) {
- BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR,
- e.toString());
- return null;
- }
- }
-
- public DTMAxisIterator setStartNode(int node) {
- if (_isRestartable) {
- // Set start node for left-hand iterator...
- _source.setStartNode(_startNode = node);
-
- // ... and get start node for right-hand iterator from left-hand,
- // with special case for //* path - see ParentLocationPath
- _iterator.setStartNode(_includeSelf ? _startNode : _source.next());
- return resetPosition();
- }
- return this;
- }
-
- public DTMAxisIterator reset() {
- _source.reset();
- // Special case for //* path - see ParentLocationPath
- _iterator.setStartNode(_includeSelf ? _startNode : _source.next());
- return resetPosition();
- }
-
- public int next() {
- for (int node;;) {
- // Try to get another node from the right-hand iterator
- if ((node = _iterator.next()) != END) {
- return returnNode(node);
- }
- // If not, get the next starting point from left-hand iterator...
- else if ((node = _source.next()) == END) {
- return END;
- }
- // ...and pass it on to the right-hand iterator
- else {
- _iterator.setStartNode(node);
- }
- }
- }
-
- public void setMark() {
- _source.setMark();
- _iterator.setMark();
- //_pos = _position;
- }
-
- public void gotoMark() {
- _source.gotoMark();
- _iterator.gotoMark();
- //_position = _pos;
- }
- }