org.apache.xalan.xsltc.dom.SingletonIterator Maven / Gradle / Ivy

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Tool to convert CSV and XLS to XML, to transform XML and to convert XML to CSV, HTML, other text files, PDF etc., useful as command line tool and integrated in other projects.

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/*
 * 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: SingletonIterator.java 468651 2006-10-28 07:04:25Z minchau $
 */

package org.apache.xalan.xsltc.dom;

import org.apache.xml.dtm.DTMAxisIterator;
import org.apache.xml.dtm.ref.DTMAxisIteratorBase;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 */
public class SingletonIterator extends DTMAxisIteratorBase {
    private int _node;
    private final boolean _isConstant;

    public SingletonIterator() {
	this(Integer.MIN_VALUE, false);
    }

    public SingletonIterator(int node) {
	this(node, false);
    }

    public SingletonIterator(int node, boolean constant) {
	_node = _startNode = node;
	_isConstant = constant;
    }
    
    /**
     * Override the value of _node only when this
     * object was constructed using the empty constructor.
     */
    public DTMAxisIterator setStartNode(int node) {
	if (_isConstant) {
	    _node = _startNode;
	    return resetPosition();
	}
	else if (_isRestartable) {
	    if (_node <= 0)
		_node = _startNode = node;
	    return resetPosition();
	}
	return this;
    }
	
    public DTMAxisIterator reset() {
	if (_isConstant) {
	    _node = _startNode;
	    return resetPosition();
	}
	else {
	    final boolean temp = _isRestartable;
	    _isRestartable = true;
	    setStartNode(_startNode);
	    _isRestartable = temp;
	}
	return this;
    }
    
    public int next() {
	final int result = _node;
	_node = DTMAxisIterator.END;
	return returnNode(result);
    }

    public void setMark() {
	_markedNode = _node;
    }

    public void gotoMark() {
	_node = _markedNode;
    }
}