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Groovy example source code file (

This example Groovy source code file ( is included in the "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 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
 * 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);

Other Groovy examples (source code examples)

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