- /*
- * 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: FilterIterator.java,v 1.8 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.DTMFilter;
- import com.sun.org.apache.xml.internal.dtm.DTMIterator;
- import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase;
-
- /**
- * Similar to a CurrentNodeListIterator except that the filter has a
- * simpler interface (only needs the node, no position, last, etc.)
- * It takes a source iterator and a Filter object and returns nodes
- * from the source after filtering them by calling filter.test(node).
- * @author Jacek Ambroziak
- * @author Santiago Pericas-Geertsen
- */
- public final class FilterIterator extends DTMAxisIteratorBase {
-
- /**
- * Reference to source iterator.
- */
- private DTMAxisIterator _source;
-
- /**
- * Reference to a filter object that to be applied to each node.
- */
- private final DTMFilter _filter;
-
- /**
- * A flag indicating if position is reversed.
- */
- private final boolean _isReverse;
-
- public FilterIterator(DTMAxisIterator source, DTMFilter filter) {
- _source = source;
- // System.out.println("FI souce = " + source + " this = " + this);
- _filter = filter;
- _isReverse = source.isReverse();
- }
-
- public boolean isReverse() {
- return _isReverse;
- }
-
-
- public void setRestartable(boolean isRestartable) {
- _isRestartable = isRestartable;
- _source.setRestartable(isRestartable);
- }
-
- public DTMAxisIterator cloneIterator() {
-
- try {
- final FilterIterator clone = (FilterIterator) super.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() {
- _source.reset();
- return resetPosition();
- }
-
- public int next() {
- int node;
- while ((node = _source.next()) != END) {
- if (_filter.acceptNode(node, DTMFilter.SHOW_ALL) == DTMIterator.FILTER_ACCEPT) {
- return returnNode(node);
- }
- }
- return END;
- }
-
- public DTMAxisIterator setStartNode(int node) {
- if (_isRestartable) {
- _source.setStartNode(_startNode = node);
- return resetPosition();
- }
- return this;
- }
-
- public void setMark() {
- _source.setMark();
- }
-
- public void gotoMark() {
- _source.gotoMark();
- }
-
- }