001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements. See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership. The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the  "License");
007     * you may not use this file except in compliance with the License.
008     * You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    /*
019     * $Id: FilteredStepIterator.java 468651 2006-10-28 07:04:25Z minchau $
020     */
021    
022    package org.apache.xalan.xsltc.dom;
023    
024    import org.apache.xml.dtm.DTMAxisIterator;
025    
026    /**
027     * Extends a StepIterator by adding the ability to filter nodes. It 
028     * uses filters similar to those of a FilterIterator.
029     * @author Jacek Ambroziak
030     * @author Santiago Pericas-Geertsen
031     * @author Morten Jorgensen
032     */
033    public final class FilteredStepIterator extends StepIterator {
034    
035        private Filter _filter;
036    
037        public FilteredStepIterator(DTMAxisIterator source,
038                                    DTMAxisIterator iterator,
039                                    Filter filter) {
040            super(source, iterator);
041            _filter = filter;
042        }
043    
044        public int next() {
045            int node;
046            while ((node = super.next()) != END) {
047                if (_filter.test(node)) {
048                    return returnNode(node);
049                }
050            }
051            return node;
052        }
053    
054    }