ReferenceIterable.java

package org.apache.blur.utils;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
import java.util.Iterator;
import java.util.NoSuchElementException;

public class ReferenceIterable<T> implements Iterable<T> {

  private T t;

  public ReferenceIterable(T t) {
    this.t = t;
  }

  @Override
  public Iterator<T> iterator() {
    return new Iterator<T>() {
      boolean taken = false;

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

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

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