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package org.osgl.util;

/*-
 * #%L
 * Java Tool
 * %%
 * Copyright (C) 2014 - 2017 OSGL (Open Source General Library)
 * %%
 * 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.
 * #L%
 */

import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 * Created with IntelliJ IDEA.
 * User: luog
 * Date: 23/10/13
 * Time: 9:02 PM
 * To change this template use File | Settings | File Templates.
 */
public class SingletonIterator implements Iterator {
    private final T t_;
    private volatile boolean consumed_;

    public SingletonIterator(T t) {
        t_ = t;
    }

    @Override
    public boolean hasNext() {
        return !consumed_;
    }

    @Override
    public T next() {
        if (consumed_) {
            throw new NoSuchElementException();
        }
        consumed_ = true;
        return t_;
    }

    @Override
    public void remove() {
        throw new UnsupportedOperationException();
    }
}