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/*
 * Copyright 2010-2012 Luca Garulli (l.garulli--at--orientechnologies.com)
 *
 * 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.
 */

package com.orientechnologies.common.collection;

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

import com.orientechnologies.common.util.OResettable;

/**
 * Allows to iterate over a single object
 * 
 * @author Luca Garulli (l.garulli--at--orientechnologies.com)
 */
public class OIterableObject implements Iterable, OResettable, Iterator {

  private final T object;
  private boolean alreadyRead = false;

  public OIterableObject(T o) {
    object = o;
  }

  /**
   * Returns an iterator over a set of elements of type T.
   * 
   * @return an Iterator.
   */
  public Iterator iterator() {
    return this;
  }

  @Override
  public void reset() {
    alreadyRead = false;
  }

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

  @Override
  public T next() {
    if (!alreadyRead) {
      alreadyRead = true;
      return object;
    } else
      throw new NoSuchElementException();
  }

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