text: /*
   * Copyright 2006-2016 zorba.io
   *
   * 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.
   */
  #ifndef ZORBA_SINGLETON_ITEM_SEQUENCE_API_H
  #define ZORBA_SINGLETON_ITEM_SEQUENCE_API_H
  
  #include <zorba/config.h>
  #include <zorba/item_sequence.h>
  #include <zorba/iterator.h>
  #include <zorba/item.h>
  
  namespace zorba { 
  
  /**
   * \brief This class is an implementation of ItemSequence. Objects of this
   * class represent a sequence with exactly one item.
   *
   * See ItemSequence
   */
  class ZORBA_DLL_PUBLIC SingletonItemSequence : public ItemSequence
  {
    /**
     * \brief Implements an iterator over the sequence.
     *
     * See Iterator.
     */
    class InternalIterator : public Iterator
    {
    private:
      SingletonItemSequence  * theItemSequence;
      bool                     theIsOpen;
      bool                     theIsDone;
  
    public:
      InternalIterator(SingletonItemSequence* seq);
      
      virtual void open();
   
      virtual bool next(Item& aItem);
  
      virtual void close();
  
      virtual bool isOpen() const;
    };
  
   protected:
    Item theItem;
  
   public:
    /**
     * @param aItem the single item of the sequence
     */
    SingletonItemSequence(const Item& aItem);
  
    virtual ~SingletonItemSequence() { }
  
    virtual Iterator_t getIterator();
  
  }; /* class SingletonItemSequence */
  
  } // namespace zorba
  
  #endif /* ZORBA_SINGLETON_ITEM_SEQUENCE_API_H */
  /* vim:set et sw=2 ts=2: */
  