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Java example source code file (CachedNodeListIterator.java)

This example Java source code file (CachedNodeListIterator.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

cachednodelistiterator, clonednodelistiterator, dtmaxisiterator, dtmaxisiteratorbase, end, integerarray

The CachedNodeListIterator.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * 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: CachedNodeListIterator.java,v 1.2.4.1 2005/09/06 05:57:47 pvedula Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.dom;

import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase;
import com.sun.org.apache.xalan.internal.xsltc.util.IntegerArray;

/**
 * CachedNodeListIterator is used for select expressions in a
 * variable or parameter. This iterator caches all nodes in an
 * IntegerArray. Its cloneIterator() method is overridden to
 * return an object of ClonedNodeListIterator.
 */
public final class CachedNodeListIterator extends DTMAxisIteratorBase {

    /**
     * Source for this iterator.
     */
    private DTMAxisIterator _source;
    private IntegerArray _nodes = new IntegerArray();
    private int _numCachedNodes = 0;
    private int _index = 0;
    private boolean _isEnded = false;

    public CachedNodeListIterator(DTMAxisIterator source) {
        _source = source;
    }

    public void setRestartable(boolean isRestartable) {
        //_isRestartable = isRestartable;
        //_source.setRestartable(isRestartable);
    }

    public DTMAxisIterator setStartNode(int node) {
        if (_isRestartable) {
            _startNode = node;
            _source.setStartNode(node);
            resetPosition();

            _isRestartable = false;
        }
        return this;
    }

    public int next() {
        return getNode(_index++);
    }

    public int getPosition() {
        return _index == 0 ? 1 : _index;
    }

    public int getNodeByPosition(int pos) {
        return getNode(pos);
    }

    public int getNode(int index) {
        if (index < _numCachedNodes) {
            return _nodes.at(index);
        }
        else if (!_isEnded){
            int node = _source.next();
            if (node != END) {
                _nodes.add(node);
                _numCachedNodes++;
            }
            else {
                _isEnded = true;
            }
            return node;
        }
        else
            return END;
    }

    public DTMAxisIterator cloneIterator() {
        ClonedNodeListIterator clone = new ClonedNodeListIterator(this);
        return clone;
    }

    public DTMAxisIterator reset() {
        _index = 0;
        return this;
    }

    public void setMark() {
        _source.setMark();
    }

    public void gotoMark() {
        _source.gotoMark();
    }
}

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