content: /**
   * 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.
   */
  package org.apache.bigtop.datagenerators.bigpetstore.generators.products.cartesian;
  
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.NoSuchElementException;
  
  public class CartesianProductField<T> implements CartesianProduct<T>
  {
  	String fieldName;
  	Iterator<T> fieldValuesIterator;
  	Collection<T> fieldValues;
  	CartesianProduct<T> previous;
  	Map<String, T> baseValue;
  
  	public CartesianProductField(String fieldName, Collection<T> fieldValues, CartesianProduct<T> previous)
  	{
  		this.fieldValues = fieldValues;
  		this.fieldName = fieldName;
  		this.previous = previous;
  	}
  
  	@Override
  	public boolean hasNext()
  	{
  		return previous.hasNext() || (fieldValuesIterator != null && fieldValuesIterator.hasNext());
  	}
  
  	@Override
  	public Map<String, T> next()
  	{
  		if(fieldValuesIterator != null)
  		{
  			Map<String, T> map = new HashMap<String, T>(baseValue);
  			map.put(fieldName, fieldValuesIterator.next());
  
  			if(!fieldValuesIterator.hasNext())
  			{
  				fieldValuesIterator = null;
  			}
  
  			return map;
  		} else if(previous.hasNext())
  		{
  			baseValue = previous.next();
  			fieldValuesIterator = fieldValues.iterator();
  
  			Map<String, T> map = new HashMap<String, T>(baseValue);
  			map.put(fieldName, fieldValuesIterator.next());
  
  			return map;
  		}
  
  		throw new NoSuchElementException();
  	}
  
  	@Override
  	public void remove()
  	{
  		throw new UnsupportedOperationException("CartesianProductBase does not support remove()");
  	}
  
  }
  