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Groovy example source code file (NodeIterator.java)

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

Java - Groovy tags/keywords

delayed_init, delayed_init, iterator, iterator, nodeiterator, nodeiterator, object, object, unsupportedoperationexception, util

The Groovy NodeIterator.java source code

 * Copyright 2003-2010 the original author or authors.
 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package groovy.util.slurpersupport;

import java.util.Iterator;

 * Helper class for iterating through nodes.
 * @author John Wilson
public abstract class NodeIterator implements Iterator {
    private static final Object DELAYED_INIT = new Object();
    private final Iterator iter;
    private Object nextNode;

    public NodeIterator(final Iterator iter) {
        this.iter = iter;
        this.nextNode = DELAYED_INIT;

    private void initNextNode(){
        if (nextNode==DELAYED_INIT) nextNode = getNextNode(iter);

    public boolean hasNext() {
        return this.nextNode != null;

    public Object next() {
        try {
            return this.nextNode;
        } finally {
            this.nextNode = getNextNode(this.iter);

    public void remove() {
        throw new UnsupportedOperationException();

    protected abstract Object getNextNode(final Iterator iter);

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