src/org/apache/xalan/xsltc/dom/FilteredStepIterator.java

/*
 * 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.xml.dtm.DTMAxisIterator;

/**
 * Extends a StepIterator by adding the ability to filter nodes. It 
 * uses filters similar to those of a FilterIterator.
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 * @author Morten Jorgensen
 */
public final class FilteredStepIterator extends StepIterator {

    private Filter _filter;

    public FilteredStepIterator(DTMAxisIterator source,
				DTMAxisIterator iterator,
				Filter filter) {
	super(source, iterator);
	_filter = filter;
    }

    public int next() {
	int node;
	while ((node = super.next()) != END) {
	    if (_filter.test(node)) {
		return returnNode(node);
	    }
	}
	return node;
    }

}